CN105657766A - Circuit switched (CS) fallback method and device, and terminal - Google Patents
Circuit switched (CS) fallback method and device, and terminal Download PDFInfo
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- CN105657766A CN105657766A CN201410659885.6A CN201410659885A CN105657766A CN 105657766 A CN105657766 A CN 105657766A CN 201410659885 A CN201410659885 A CN 201410659885A CN 105657766 A CN105657766 A CN 105657766A
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Abstract
The embodiment of the invention discloses a circuit switched (CS) fallback method and device, and a terminal. The method comprises the following steps that: after receiving an indication that CS falls back to a 2G network, a terminal finds whether frequency point information in an adjacent region of a 3G network is stored locally or not; when the frequency point information in the adjacent region of the 3G network is stored, frequency point searching is carried out according to the frequency point information in the adjacent region of the 3G network; and CS service access is carried out through a searched frequency point.
Description
Technical field
The present invention relates to circuit domain dropping technology, particularly relate to circuit domain fallback method and device, terminal that a kind of 2G of being applicable to and 3G covers under network jointly.
Background technology
In the epoch that 3G arrives, operator need to take into account 2G and 3G subscription, supports 2G and 3G network simultaneously. In most of situation, owing to 2G network is such as global system for mobile communications (GSM, GlobalSystemforMobileCommunication) networking is ripe, the covering of 2G network is much better than the covering of 3G network, in order to ensure speech business, tendency preference circuit domain dropping (CSFB, CircuitSwitchedFallback) is to 2G network. But also there is a lot of restriction in 2G network, do not support such as GSM network equipment or do not open double-transmission mode (DTM, DualTransferMode), namely not supported data and voice and sending service, even if or network support DTM, owing to GSM network speech business is too busy, to such an extent as to do not have unnecessary interface-free resources to distribute to terminal and support DTM. And now probably there is a large amount of 3G available network resource in region residing for terminal, and 3G network supported data and speech concurrent, user has better Consumer's Experience. And network only supports that CSFB falls back to 2G or 3G network in 3GPP standard, and do not support to fall back to 2G or 3G network according to network coverage situation Dynamic Selection. Thus, how to allow terminal fall back to 2G network according to network coverage situation Dynamic Selection CSFB or 3G network becomes operator's problems faced.
Summary of the invention
The embodiment of the present invention is for solving the problems of the technologies described above, it is provided that a kind of circuit domain fallback method and device, terminal, can make terminal priority access 3G network after receiving circuit domain dropping instruction, thus the business experience effect making terminal is better.
The technical scheme of the embodiment of the present invention is achieved in that
A kind of circuit domain fallback method, comprising:
After terminal receives circuit domain dropping to the instruction of 2G network, search in this locality and whether store 3G network and face district's frequency point information, store and face district's frequency point information by described 3G when 3G faces district's frequency point information and carry out frequency search, and carry out circuit domain CS service access by the frequency searched.
Preferably, described method also comprises:
Do not store 3G network in this locality and face district's frequency point information or when search 3G faces the failure of district frequency point information, described terminal searches the 3G subdistrict frequency point information whether storing access recently in this locality, carry out frequency search by the 3G subdistrict frequency point information of described nearest access when storing the 3G subdistrict frequency point information of access recently, and carry out CS service access by the frequency searched.
Preferably, described method also comprises:
Preferably, described method also comprises:
When not searching the 3G subdistrict frequency point information of access recently, then corresponding according to public land mobile network PLMN 3G frequency band list carries out frequency search, and carries out CS service access by the frequency searched.
Preferably, described method also comprises:
When carrying out CS speech business access failure by 3G frequency, the 2G subdistrict frequency point information that described terminal sends according to network side carries out CS speech business access.
Preferably, described method also comprises:
Described terminal, after carrying out CS service access by 3G frequency, upgrades the 3G subdistrict frequency point information of local nearest access.
Preferably, described method also comprises:
When described terminal is in idle state, receives the system message that network side sends, from described system message, obtain 3G network face district's frequency point information, and store described 3G network and face district's frequency point information.
A kind of circuit domain dropping device, comprising: receives unit, storage unit, search unit and access unit, wherein:
Receive unit, for receiving circuit domain dropping to the instruction of 2G network, and search unit described in triggering;
Storage unit, the 3G network for storage networking side system message arrangement faces district's frequency point information;
Search unit, whether store 3G network face district's frequency point information for searching in described storage unit, store and when 3G faces district's frequency point information, trigger described access unit;
Access unit, carries out frequency search for facing district's frequency point information by described 3G, and carries out circuit domain CS service access by the frequency searched.
Preferably, described storage unit, also for storing the 3G subdistrict frequency point information of access recently;
Described search unit, also for when described storage unit does not store when 3G network faces district's frequency point information or described access unit searches 3G faces district's frequency point information failure, the 3G subdistrict frequency point information whether storing access recently is searched in this locality, when storing the 3G subdistrict frequency point information of access recently, trigger described access unit; Described access unit carries out frequency search by the 3G subdistrict frequency point information of described nearest access, and carries out CS service access by the frequency searched.
Preferably, described access unit, also for when not searching the 3G subdistrict frequency point information of access recently, the 3G frequency band list corresponding according to public land mobile network PLMN carries out frequency search, and carries out CS service access by the frequency searched.
Preferably, described reception unit is also for receiving the 2G subdistrict frequency point information that network side sends;
When described access unit carries out CS speech business access failure by 3G frequency, carry out CS speech business access according to the 2G subdistrict frequency point information that network side sends.
Preferably, described device also comprises:
Updating block, at described access unit after carrying out CS service access by 3G frequency, upgrade in described storage unit the 3G subdistrict frequency point information of nearest access stored.
Preferably, described reception unit, also for when described device is in idle state, receiving the system message that network side sends, from described system message, obtain 3G network face district's frequency point information, and described 3G network is faced district's frequency point information and is stored to described storage unit.
A kind of terminal, comprises aforesaid circuit domain dropping device.
In the embodiment of the present invention, terminal receive network side send circuit domain dropping to the instruction of 2G network, first search in this locality and whether store 3G network and face district's frequency point information, then face district's frequency by 3G network during storage to search for, and search for successfully after access 3G network frequency and carry out corresponding CS business, if not searching 3G network frequency, the 3G subdistrict frequency point information whether storing access recently is then searched in this locality, then search for by the 3G subdistrict frequency point of access recently during storage, and search for successfully after access 3G network frequency and carry out corresponding CS business.If by the 3G subdistrict frequency point still access failure of access recently, then can search frequency range corresponding to 3G network by PLMN mark, 3G frequency range be searched for and accesses and carry out CS business. Only when terminal can not access 3G network, the 2G subdistrict frequency point information just sent according to network side carries out CS speech business access.
Compared with prior art, the technical scheme of the embodiment of the present invention has at least following useful effect: when carrying out CSFB, the autonomous first search of terminal and access 3G community, it is ensured that terminal is having 3G covering region, terminal preferentially falls back to 3G network, ensures that user has good experience; Further, the technical scheme of the embodiment of the present invention determines the mode of network selecting having simultaneously during voice fallback under 2/3G covering scene, compensate for the deficiency of 3GPP standard.
Accompanying drawing explanation
Fig. 1 is the schema of the circuit domain fallback method of the embodiment of the present invention;
Fig. 2 is the schema of the circuit domain fallback method of example one of the present invention;
Fig. 3 is the schema of the circuit domain fallback method of example two of the present invention;
Fig. 4 is the schema of the circuit domain fallback method of example three of the present invention;
Fig. 5 is the composition structural representation of the circuit domain dropping device of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
In the CSFB scheme of existing 3GPP standard, network side can only be configured to fall back to 2G network or 3G network, and can not according to wireless network coverage condition sweetly disposition, selection return back to 3G or 2G network, if CSFB falls back to 2G network, then the covering of support voice business can ensure but supported data and speech concurrent ability are not good enough, if CSFB falls back to 3G network, can supported data and speech concurrent, but be limited to 3G network coverage. The technical scheme of the embodiment of the present invention is for above-mentioned situation, network configuration be CSFB fall back to 2G network time, whether the system message that terminal sends according to LTE network configures 3G and faces cell information or according to the 3G network community of access 3G cell history information and PLMN corresponding frequency band information search. The autonomous prioritizing selection access 3G network of terminal carries out CS speech business, if but terminal does not search 3G network, then the 2G subdistrict frequency point information issued by network side, and access 2G network carries out CS speech business.
Fig. 1 is the schematic flow sheet of the circuit domain fallback method of the embodiment of the present invention, and as shown in Figure 1, the circuit domain fallback method of this example comprises the following steps:
Step 101, after terminal receives circuit domain dropping to the instruction of 2G network, search in this locality and whether store 3G network and face district's frequency point information, store and face district's frequency point information by described 3G when 3G faces district's frequency point information and carry out frequency search, and carry out circuit domain CS service access by the frequency searched.
In the embodiment of the present invention, when terminal is in idle state, receives the system message (SIB6) that network side sends, from described system message, obtain 3G network face district's frequency point information, and store described 3G network and face district's frequency point information.
Step 102, do not store 3G network in this locality and face district's frequency point information or when search 3G faces the failure of district frequency point information, described terminal searches the 3G subdistrict frequency point information whether storing access recently in this locality, carry out frequency search by the 3G subdistrict frequency point information of described nearest access when storing the 3G subdistrict frequency point information of access recently, and carry out CS service access by the frequency searched.
In the embodiment of the present invention, when terminal is after carrying out CS service access by 3G frequency, the 3G subdistrict frequency point information of the local nearest access that will upgrade in time.
Step 103, when not searching the 3G subdistrict frequency point information of access recently, then corresponding according to public land mobile network PLMN 3G frequency band list carries out frequency search, and carries out CS service access by the frequency searched.
Step 104, when carrying out CS speech business access failure by 3G frequency, the 2G subdistrict frequency point information that described terminal sends according to network side carries out CS speech business access.
Below by way of concrete example, illustrate the essence of the technical scheme of the embodiment of the present invention further.
Fig. 2 is the schema of the circuit domain fallback method of example one of the present invention, and as shown in Figure 2, terminal resides in LTE network, and it is in Idle state, terminal reads LTE network system message (SIB6), and the 3G obtaining the configuration of network side from SIB6 faces district's frequency point information, and stores. When instruction (the RRC_connection_release message of the circuit domain dropping to 2G network that receive the transmission of network side, wherein carry redirection information RedirectedCarrierInfo), terminal will be searched 3G and be faced district's frequency point information in this locality, and face district's frequency according to the 3G found and search for. When searching 3G community, terminal access 3G community, initiates the calling of CS voice; And upgrade the nearest access 3G subdistrict frequency point information that terminal local stores.
If network side does not configure 3G Lin Qu or state cannot read LTE system message because terminal is in connection, then terminal is searched for according to access 3G network history information recently and is accessed 3G network, if finally not searching element to 3G network, then search for by the corresponding frequency/band information of PLMN network No. and access 3G network. If terminal to access 3G network by above-mentioned all modes still failed, then terminal issues according to network side 2G subdistrict frequency point information access also carries out CS speech business.
In the embodiment of the present invention, when terminal is in Idle state, it is possible to read the 3G Lin Qu in LTE system message SIB6 and 3G is faced district's information and faces community band information list stored in the 3G of this locality. When terminal needs falling to carry out speech business, terminal is faced district's frequency point information by 3G and is searched for, if 3G community can successfully be accessed, the frequency point information of Ba Gai 3G community is updated to the nearest access 3G subdistrict frequency point information list of local storage.
When terminal is in connection state, it is possible to the 3G before not receiving the configuration of network side faces community band information, then searching for by the frequency point information of access 3G community recently, if do not searched, then the frequency band list of the corresponding 3G of PLMNList carries out scanning search;
In the embodiment of the present invention, terminal stores 3G and faces subdistrict frequency point information list and the 3G subdistrict frequency point information list of access recently, wherein, 3G faces and stores current resident LTE cell configuration 3G in subdistrict frequency point information list and face district's list, and Idle state terminal can configure 3G Lin Qu according to reading LTE system message (SIB6) and carry out real-time update; The 3G subdistrict frequency point information list of access recently: after every time successfully accessing 3G network, terminal upgrades access 3G subdistrict frequency point information list recently;
Fig. 3 is the schema of the circuit domain fallback method of example two of the present invention, as shown in Figure 3, in this example, terminal is breathed out as caller, when CSFB terminal initiates CS voice caller (ExtendedServiceRequest), network side issues RRCconnectionrelease, and terminal searches 3G community (flow process shown in Figure 2) according to Idle state before or connection state process, the resident 3G network of prioritizing selection, secondary selects 2G network.Being linked into 3G/2G community, the rear associating LA/RA that initiates upgrades. The circuit domain fallback method of this example comprises the following steps:
Step 1, moving exchanging center MSC initiates the paging to UE, and UE responds this beep-page message; MME sends circuit domain dropping instruction (CSFallbackindicator) message to base station;
Step 2, base station sends RRCconnectionrelease message to terminal, and indicating terminal is redirected;
Step 4, base station sends context release request (ContextReleaseRequest) message to MME;
Specifically, step 6-step 7, UE configures according to LTE network 3G Lin Qu, it is preferable that access 3G network, secondary choosing access 2G network, and the 3G network access opening Fig. 2 example shown of the present invention is selected.
Specifically, step 6-step 11, UE opens the flow process of access 2G network.
Owing to step 6 to the access step of step 11 is the standard access process of correlation standard, repeat no more its access details here.
Fig. 4 is the schema of the circuit domain fallback method of example three of the present invention, as shown in Figure 4, in this example, terminal is as called incoming call, when CSFB terminal receives paging (CSPaging), network side issues RRCconnectionrelease, and terminal searches 3G community (flow process shown in Figure 2) according to Idle state before or link state process, the resident 3G network of prioritizing selection, secondary selects 2G network. Being linked into 3G/2G community, the rear associating LA/RA that initiates upgrades. The circuit domain fallback method of this example comprises the following steps:
Step 1, moving exchanging center MSC initiates the paging to UE, and UE responds this beep-page message; MME sends circuit domain dropping instruction (CSFallbackindicator) message to base station;
Step 2, base station sends RRCconnectionrelease message to terminal, and indicating terminal is redirected;
Step 3, base station sends context release request (ContextReleaseRequest) message to MME;
Step 4, UE configures according to LTE network 3G Lin Qu, it is preferable that access 3G network, secondary choosing access 2G network, and the 3G network access opening Fig. 2 example shown of the present invention is selected.
Specifically, step 5-step 6, UE configures according to LTE network 3G Lin Qu, it is preferable that access 3G network, secondary choosing access 2G network, and the 3G network access opening Fig. 2 example shown of the present invention is selected.
Specifically, step 5-step 8, UE opens the flow process of access 2G network.
Owing to step 5 to the access step of step 8 is the standard access process of correlation standard, repeat no more its access details here.
The embodiment of the present invention is by the autonomous first search of CSFB terminal and access 3G community, it is ensured that terminal is having 3G to cover region, and terminal preferentially falls back to 3G network, ensures that user has good experience; Also by the autonomous first search of CSFB terminal and access 3G community, solve the problem that simultaneously there is voice fallback network selecting under 2/3G covering scene, compensate for the deficiency do not supported to issue configuration 3G and 2G in 3GPP standard simultaneously and face district's frequency problem and same class network cell frequency point information can only be issued.
Fig. 5 is the composition structural representation of the circuit domain dropping device of the embodiment of the present invention, and as shown in Figure 5, the circuit domain dropping device of the embodiment of the present invention comprises reception unit 50, storage unit 51, searches unit 52 and access unit 53, wherein:
Receive unit 50, for receiving circuit domain dropping to the instruction of 2G network, and search unit 52 described in triggering;
Storage unit 51, faces district's frequency point information for storing 3G network;
Search unit 52, face district's frequency point information for searching the 3G network whether storing network side system message arrangement in described storage unit, store and when 3G faces district's frequency point information, trigger described access unit;
Access unit 53, carries out frequency search for facing district's frequency point information by described 3G, and carries out circuit domain CS service access by the frequency searched.
In the embodiment of the present invention, described storage unit 51, also for storing the 3G subdistrict frequency point information of access recently;
Described search unit 52, also for described storage unit do not store when 3G network faces district's frequency point information or described access unit 53 search for 3G face the failure of district frequency point information time, the 3G subdistrict frequency point information whether storing access recently is searched in this locality, when storing the 3G subdistrict frequency point information of access recently, trigger described access unit 53 and carry out frequency search by the 3G subdistrict frequency point information of described nearest access, and carry out CS service access by the frequency searched.
In the embodiment of the present invention, described access unit 53, also for when not searching the 3G subdistrict frequency point information of access recently, the 3G frequency band list corresponding according to public land mobile network PLMN carries out frequency search, and carries out CS service access by the frequency searched.
In the embodiment of the present invention, described reception unit 50 is also for receiving the 2G subdistrict frequency point information that network side sends;
When described access unit 53 carries out CS speech business access failure by 3G frequency, carry out CS speech business access according to the 2G subdistrict frequency point information that network side sends.
On the basis of the circuit domain dropping device shown in Fig. 5, described device also comprises:
Updating block (does not illustrate in Fig. 5), at described access unit after carrying out CS service access by 3G frequency, upgrade in described storage unit the 3G subdistrict frequency point information of nearest access stored.
In the embodiment of the present invention, described reception unit 50, also for when described device is in idle state, receiving the system message that network side sends, from described system message, obtain 3G network face district's frequency point information, and described 3G network is faced district's frequency point information and is stored to described storage unit 51.
In the embodiment of the present invention, described different frequent point comprises different system frequency.
It will be understood and appreciated by those or skill in the art that the practical function of each processing unit in the circuit domain dropping device shown in Fig. 5 can refer to the associated description of aforementioned circuit domain dropping method and embodiment thereof and understands. It will be understood and appreciated by those or skill in the art that the function of each processing unit in the circuit domain dropping device shown in Fig. 5 realizes by the program of running on treater, it is possible to realized by concrete logical circuit.
The embodiment of the present invention also describes a kind of terminal, and described terminal comprises the circuit domain dropping device shown in Fig. 5.
The embodiment of the present invention also describes a kind of terminal, and described terminal comprises previous embodiment frequency measuring apparatus as shown in Figure 4.
Between technical scheme described in the embodiment of the present invention, when not conflicting, it is possible to arbitrary combination.
In provided by the present invention several embodiments, it should be appreciated that, disclosed method, device and electronics, it is possible to realize by another way. Apparatus embodiments described above is only schematic, such as, the division of described unit, it is only a kind of logic function to divide, actual can have other dividing mode when realizing, and as: multiple unit or assembly can be in conjunction with, maybe can be integrated into another system, or some features can ignore, or do not perform. In addition, the coupling each other of shown or discussed each integral part or directly coupling or communication connection can be the indirect coupling by some interfaces, equipment or unit or communication connection, it is possible to be electrical, machinery or other form.
The above-mentioned unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, it is also possible to be distributed on multiple NE;Part or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in various embodiments of the present invention can all be integrated in a processing unit, it is also possible to is that each unit is individually as a unit, it is also possible to two or more unit are in a unit integrated; Above-mentioned integrated unit both can adopt the form of hardware to realize, it is also possible to the form adopting hardware to add application functional unit realizes.
One of ordinary skill in the art will appreciate that: all or part of step realizing aforesaid method embodiment can be completed by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising aforesaid method embodiment; And aforesaid storage media comprises: mobile storage equipment, read-only storage (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
Or, if the above-mentioned integrated unit of the embodiment of the present invention using apply function module form realize and as independent production marketing or use time, it is also possible to be stored in a computer read/write memory medium. Based on such understanding, the technical scheme of the embodiment of the present invention in essence or says that part prior art contributed can embody with the form of application product, these computer application products are stored in a storage media, comprise some instructions with so that a computer equipment (can be Personal Computer, server or the network equipment etc.) performs all or part of of method described in each embodiment of the present invention. And aforesaid storage media comprises: mobile storage equipment, read-only storage (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
Protection scope of the present invention is not limited thereto, and is familiar with those skilled in the art in the technical scope that the present invention discloses, and can expect change easily or replace, all should be encompassed within protection scope of the present invention.
Claims (13)
1. a circuit domain fallback method, it is characterised in that, described method comprises:
After terminal receives circuit domain dropping to the instruction of 2G network, search in this locality and whether store 3G network and face district's frequency point information, store and face district's frequency point information by described 3G when 3G faces district's frequency point information and carry out frequency search, and carry out circuit domain CS service access by the frequency searched.
2. method according to claim 1, it is characterised in that, described method also comprises:
Do not store 3G network in this locality and face district's frequency point information or when search 3G faces the failure of district frequency point information, described terminal searches the 3G subdistrict frequency point information whether storing access recently in this locality, carry out frequency search by the 3G subdistrict frequency point information of described nearest access when storing the 3G subdistrict frequency point information of access recently, and carry out CS service access by the frequency searched.
3. method according to claim 2, it is characterised in that, described method also comprises:
When not searching the 3G subdistrict frequency point information of access recently, then corresponding according to public land mobile network PLMN 3G frequency band list carries out frequency search, and carries out CS service access by the frequency searched.
4. method according to the arbitrary item of claims 1 to 3, it is characterised in that, described method also comprises:
When carrying out CS speech business access failure by 3G frequency, the 2G subdistrict frequency point information that described terminal sends according to network side carries out CS speech business access.
5. method according to the arbitrary item of claims 1 to 3, it is characterised in that, described method also comprises:
Described terminal, after carrying out CS service access by 3G frequency, upgrades the 3G subdistrict frequency point information of local nearest access.
6. method according to the arbitrary item of claims 1 to 3, it is characterised in that, described method also comprises:
When described terminal is in idle state, receives the system message that network side sends, from described system message, obtain 3G network face district's frequency point information, and store described 3G network and face district's frequency point information.
7. a circuit domain dropping device, it is characterised in that, described device comprises: receives unit, storage unit, search unit and access unit, wherein:
Receive unit, for receiving circuit domain dropping to the instruction of 2G network, and search unit described in triggering;
Storage unit, faces district's frequency point information for storing 3G network;
Search unit, face district's frequency point information for searching the 3G network whether storing network side system message arrangement in described storage unit, store and when 3G faces district's frequency point information, trigger described access unit;
Access unit, carries out frequency search for facing district's frequency point information by described 3G, and carries out circuit domain CS service access by the frequency searched.
8. device according to claim 7, it is characterised in that, described storage unit, also for storing the 3G subdistrict frequency point information of access recently;
Described search unit, also for when described storage unit does not store when 3G network faces district's frequency point information or described access unit searches 3G faces district's frequency point information failure, the 3G subdistrict frequency point information whether storing access recently is searched in this locality, when storing the 3G subdistrict frequency point information of access recently, trigger described access unit; Described access unit carries out frequency search by the 3G subdistrict frequency point information of described nearest access, and carries out CS service access by the frequency searched.
9. device according to claim 8, it is characterized in that, described access unit, also for when not searching the 3G subdistrict frequency point information of access recently, the 3G frequency band list corresponding according to public land mobile network PLMN carries out frequency search, and carries out CS service access by the frequency searched.
10. device according to the arbitrary item of claim 7 to 9, it is characterised in that, described reception unit is also for receiving the 2G subdistrict frequency point information that network side sends;
When described access unit carries out CS speech business access failure by 3G frequency, carry out CS speech business access according to the 2G subdistrict frequency point information that network side sends.
11. devices according to the arbitrary item of claim 7 to 9, it is characterised in that, described device also comprises:
Updating block, at described access unit after carrying out CS service access by 3G frequency, upgrade in described storage unit the 3G subdistrict frequency point information of nearest access stored.
12. devices according to the arbitrary item of claim 7 to 9, it is characterized in that, described reception unit, also for when described device is in idle state, receive the system message that network side sends, from described system message, obtain 3G network face district's frequency point information, and described 3G network is faced district's frequency point information and is stored to described storage unit.
13. 1 kinds of terminals, it is characterised in that, described terminal comprises the circuit domain dropping device described in the arbitrary item of claim 7 to 12.
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| CN111148181A (en) * | 2019-12-23 | 2020-05-12 | 东莞宇龙通信科技有限公司 | Method, apparatus, electronic device and medium for using 5G communication network |
| CN111836362A (en) * | 2020-07-13 | 2020-10-27 | 中国联合网络通信集团有限公司 | Method and device for establishing call |
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