CN107872840B - GSM cell synchronization method and device under LTE + GSM dual-card LTE packet switching and mobile terminal - Google Patents

GSM cell synchronization method and device under LTE + GSM dual-card LTE packet switching and mobile terminal Download PDF

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CN107872840B
CN107872840B CN201610852992.XA CN201610852992A CN107872840B CN 107872840 B CN107872840 B CN 107872840B CN 201610852992 A CN201610852992 A CN 201610852992A CN 107872840 B CN107872840 B CN 107872840B
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gsm
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synchronization
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CN107872840A (en
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孙强
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

The invention provides a method and a device for synchronizing a GSM cell under LTE + GSM dual-card LTE packet switching and a mobile terminal. The method comprises the following steps: selecting a position A in a paging channel PCH of the GSM card, wherein the shortest interval between the current position and the position A is 4 GSM frames plus 1 GSM time slot, and other task conflicts do not exist in a first section of cell search task to be performed at the current position; sending a buffer state BSR (buffer status) to the network side, and recovering the BSR after the task is completed; judging whether the first section of cell searching task finds a GSM synchronous position at the shortest position of 4 GSM frames plus 1 GSM time slot; and when the first section of cell searching task finds the GSM synchronous position, the synchronization is successful. The invention can reduce the frequency of knocking off LTE data packets on the premise of considering the GSM synchronization performance, reduce the speed rate influence on the LTE data service, and greatly improve the network stability of the terminal.

Description

GSM cell synchronization method and device under LTE + GSM dual-card LTE packet switching and mobile terminal
Technical Field
The invention relates to the technical field of mobile communication, in particular to a method and a device for synchronizing GSM (global system for mobile communications) cells under LTE + GSM (long term evolution) dual-card LTE packet switching and a mobile terminal.
Background
With the increasingly powerful mobile phone technology and the increasing demand of people on the functions of mobile phones, the LTE + GSM dual-card mode is widely applied in the mobile phone market, and in the LTE + GSM dual-card mode, when LTE performs data services, there are synchronization tasks of GSM neighbor cells of LTE cards or GSM card cells, and the completion of the synchronization tasks of these GSM cells requires the completion of the packet of LTE, so how to solve the key problem that GSM synchronization is currently faced on the premise of having little influence on LTE data packet exchange services.
In the conventional GSM synchronization, a 12 frame +1 slot unit is used for synchronization, or a relatively new method may also use a single frame +1 slot unit.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
the influence on the rate of the LTE packet switching process is large in a mode of taking 12 frames and 1 time slot as a unit; the mode of taking a single frame plus 1 time slot as a unit has the defects that the times of punching the data packet are more, the consumption of the process of punching the data packet is larger, the times of punching the data packet are too many, and the data packet is easy to collide, so that the search period is lengthened.
Disclosure of Invention
The GSM cell synchronization method, the GSM cell synchronization device and the mobile terminal under LTE + GSM dual-card LTE packet switching can reduce the frequency of dropping LTE data packets on the premise of considering the GSM synchronization performance, reduce the speed rate influence on the data service of LTE, and greatly improve the network stability of the terminal.
In a first aspect, the present invention provides a GSM cell synchronization method under LTE + GSM dual-card LTE packet switching, including:
selecting a position A in a paging channel PCH of the GSM card, wherein the interval between the current position and the position A is the receiving length, the shortest distance is 4 GSM frames plus 1 GSM time slot, and other task conflicts do not exist in a first section of cell searching task to be performed by the current position;
sending a buffer state BSR (0) to a network side, and recovering the BSR after the cell search task and the paging task are completed;
judging whether the first section of cell searching task finds a GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot;
and when the first section of cell searching task finds the GSM synchronous position at the position where the receiving length is shortest and is 4 GSM frames plus 1 GSM time slot, the synchronization is successful.
Optionally, the method further comprises:
when the first section of cell search task does not find the GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot, taking the starting point of the first section of cell search task as a reference, performing a second section of GSM search task at the position where 51n +8 frames are connected with the next paging task, and judging whether the second section of GSM search task finds the GSM synchronous position at the position where 51n +8 frames are connected with the next paging task, wherein n is a search period and n is a natural number;
and when the second section of GSM searching task carries out second section of GSM searching at the position connected with the next paging task and with 51n +8 frames, finding out the synchronous position of the GSM, and the synchronization is successful.
Optionally, the method further comprises:
when the second section of GSM searching task does not find the synchronous position of the GSM when the second section of GSM searching task is carried out at the position which is 51n +8 frames and is connected with the next paging task, taking the starting point of the first section of cell searching task as the reference, continuing the third section of GSM searching task at the position which is 51m +4 frames and has no paging conflict, and judging whether the synchronous position of the GSM is found at the position which is 51m +4 frames and has no paging conflict by the third section of GSM searching task, wherein m is a searching period and m is a natural number;
and when the third section of GSM searching task finds the synchronous position of the GSM at the position with 51m +4 frames and without paging conflict, the synchronization is successful, otherwise, the synchronization is failed.
In a second aspect, the present invention provides a GSM cell synchronization apparatus under LTE + GSM dual-card LTE packet switching, the apparatus comprising:
the device comprises a selecting unit and a processing unit, wherein the selecting unit is used for selecting a position A in a paging channel PCH of the GSM card, the interval between the current position and the position A is the receiving length, the shortest distance is 4 GSM frames plus 1 GSM time slot, and other task conflicts do not exist in a first section of cell searching task to be performed by the current position;
the notification unit is used for sending a buffer state BSR (0) to a network side and recovering the BSR after the cell search task and the paging task are completed;
and the first judging unit is used for judging whether the first section of cell searching task finds the GSM synchronous position at the current position, and when the cell searching task finds the GSM synchronous position at the current position, the synchronization is successful.
Optionally, the apparatus further comprises:
a first searching unit, configured to, when the GSM synchronization position is not found in the position where the receiving length of the first-stage cell search task is shortest and is 4 GSM frames plus 1 GSM time slot, perform a second-stage GSM search task at a position where 51n +8 frames are connected to a next paging task, with the starting point of the first-stage cell search task as a reference;
and the second judging unit is used for judging whether the second section of GSM searching task finds the synchronous position of the GSM at the position where 51n +8 frames are connected with the next paging task or not, wherein n is a searching period and is a natural number, and when the second section of GSM searching task carries out second section of GSM searching at the position where 51n +8 frames are connected with the next paging task, the synchronous position of the GSM is found, and the synchronization is successful.
Optionally, the apparatus further comprises:
a second searching unit, configured to, when the second section of GSM search task is performed at a location where 51n +8 frames are connected to a next paging task, find no synchronous location of the GSM, continue to perform a third section of GSM search task at a location where 51m +4 frames are not in paging collision, with the starting point of the first section of cell search task as a reference;
and a third judging unit, configured to judge whether the third GSM search task finds the synchronization position of the GSM at a position where there is no paging collision and in 51m +4 frames, where m is a search period and m is a natural number, and when the third GSM search task finds the synchronization position of the GSM at a position where there is no paging collision and in 51m +4 frames, the synchronization is successful, and otherwise, the synchronization is failed.
In a third aspect, the present invention provides a mobile terminal, where the mobile terminal includes the GSM cell synchronization apparatus under LTE + GSM dual-card LTE packet switching.
According to the method, the device and the mobile terminal for synchronizing the GSM cells under the LTE + GSM dual-card LTE packet exchange, provided by the embodiment of the invention, the position A in a paging channel PCH of the GSM card is selected, wherein the interval between the current position and the position A is the receiving length, the shortest distance is 4 GSM frames plus 1 GSM time slot, and other task conflicts do not exist in a first section of cell searching task to be performed at the current position; sending a buffer state BSR (0) to a network side, and recovering the BSR after the cell search task and the paging task are completed; judging whether the first section of cell searching task finds a GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot; and when the first section of cell search task finds the GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot, the synchronization is successful, otherwise, the synchronization is failed. Compared with the prior art, the invention can reduce the frequency of knocking off LTE data packets on the premise of considering the GSM synchronization performance, reduce the speed influence on the LTE data service, and greatly improve the network stability of the terminal.
Drawings
Fig. 1 is a flowchart of a GSM cell synchronization method under LTE + GSM dual-card LTE packet switching according to an embodiment of the present invention;
FIG. 2 is a block diagram of a GSM 51 multiframe according to an embodiment of the present invention;
fig. 3 is a flowchart of a GSM cell synchronization method under LTE + GSM dual card LTE packet switching according to another embodiment of the present invention;
FIG. 4 is a block diagram of a GSM 51 multi-frame cell search process according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a GSM cell synchronization apparatus under LTE + GSM dual-card LTE packet switching according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a GSM cell synchronization apparatus under LTE + GSM dual-card LTE packet switching according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a GSM cell synchronization method under LTE + GSM dual-card LTE packet switching, as shown in figure 1, the method comprises the following steps:
s11, selecting a position A in a paging channel PCH of the GSM card, wherein the interval between the current position and the position A is the receiving length, the shortest distance is 4 GSM frames plus 1 GSM time slot, and other task conflicts do not exist in the first section of cell searching task to be performed by the current position;
specifically, the search process of the current location is performed in a GSM 51 multiframe structure, where the 51 multiframe structure is shown in fig. 2;
specifically, when a conflict occurs between a task generated by a burst of the GSM card and a segmented search task of the GSM, the cell search task can be continued as long as 51 frames are added by the conflicted GSM cell search task segment to generate the task again;
s12, sending a buffer status BSR equal to 0 to the network side, and recovering the BSR after the cell search task and the paging task are completed;
s13, judging whether the first section of cell searching task finds the GSM synchronous position at the position where the receiving length is shortest and is 4 GSM frames plus 1 GSM time slot;
and S14, when the first section of cell search task finds the GSM synchronous position at the position where the receiving length is shortest and is 4 GSM frames plus 1 GSM time slot, the synchronization is successful.
Further, as shown in fig. 3, the method further includes:
s15, when the first section of cell search task does not find the GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot, taking the starting point of the first section of cell search task as the reference, performing a second section of GSM search task at the position where 51n +8 frames are connected with the next paging task, and judging whether the second section of GSM search task finds the GSM synchronous position at the position where 51n +8 frames are connected with the next paging task, wherein n is the search period and n is a natural number;
specifically, the paging task of GSM exists in the PCCH block of the 51-multiframe, and the paging cycle of GSM is generally a positive integer multiple of 51 and greater than 1;
for example: as shown in fig. 4, the paging cycle of GSM is 2 × 51, the PCCH module is a paging receiving location, the first segment of cell search task is located at a location immediately before the PCCH module, and when the first segment of cell search task does not find the synchronization location of GSM, the second segment of cell search task is performed at a location immediately after receiving the PCCH module for the second time;
and S16, when the second GSM searching task carries out second GSM searching at the position connected with the next paging task and with 51n +8 frames, finding the synchronous position of the GSM, and the synchronization is successful.
Further, as shown in fig. 3, the method further includes:
s17, when the second GSM search task is carried out at the position where 51n +8 frames are connected with the next paging task, the synchronous position of the GSM is not found, then the third GSM search task is carried out at the position where 51m +4 frames are not provided with paging conflict by taking the starting point of the first cell search task as the reference, and whether the synchronous position of the GSM is found at the position where 51m +4 frames are provided with no paging conflict by the third GSM search task is judged, wherein m is the search period and m is a natural number;
and S18, when the third section of GSM searching task finds the synchronous position of the GSM in the position with 51m +4 frames and without paging conflict, the synchronization is successful, otherwise, the synchronization is failed.
The GSM cell synchronization method under LTE + GSM dual-card LTE packet switching provided by the embodiment of the invention can reduce the frequency of dropping the LTE data packet on the premise of considering the GSM synchronization performance, reduce the speed influence on the LTE data service, and greatly improve the stability performance of the terminal network.
The embodiment of the present invention further provides a GSM cell synchronization apparatus under LTE + GSM dual-card LTE packet switching, as shown in fig. 5, the apparatus includes:
a selecting unit 11, configured to select a position a in a paging channel PCH of the GSM card, where an interval between a current position and the position a is a receiving length, and a shortest interval is 4 GSM frames plus 1 GSM time slot, and there is no conflict between other tasks in a first segment of a cell search task to be performed by the current position;
a notification unit 12, configured to send a buffer status BSR equal to 0 to a network side, and recover the BSR after the cell search task and the paging task are completed;
a first judging unit 13, configured to judge whether the first segment of cell search task finds a GSM synchronization position at the current position, and when the cell search task finds a GSM synchronization position at the current position, synchronization is successful.
Further, as shown in fig. 6, the apparatus further includes:
a first search unit 14, configured to, when the GSM synchronization position is not found in the position where the reception length of the first segment of cell search task is shortest and is 4 GSM frames plus 1 GSM timeslot, perform a second segment of GSM search task at a position where 51n +8 frames are connected to a next paging task, with the starting point of the first segment of cell search task as a reference;
a second determining unit 15, configured to determine whether the second GSM search task finds the synchronization position of the GSM at a position where the second GSM search task is connected to the next paging task in 51n +8 frames, where n is a search period and n is a natural number, and when the second GSM search task performs the second GSM search at a position where the second GSM search task is connected to the next paging task in 51n +8 frames, the synchronization position of the GSM is found, and synchronization is successful.
Further, as shown in fig. 6, the apparatus further includes:
a second searching unit 16, configured to, when the second section of GSM search task is performed at a location where 51n +8 frames are connected to a next paging task, find no synchronous location of the GSM, continue to perform a third section of GSM search task at a location where 51m +4 frames are not in paging collision, with the starting point of the first section of cell search task as a reference;
a third determining unit 17, configured to determine whether the third segment of GSM search task finds the synchronization position of the GSM at a position where there is no paging collision and in 51m +4 frames, where m is a search period and m is a natural number, and when the third segment of GSM search task finds the synchronization position of the GSM at a position where there is no paging collision and in 51m +4 frames, the synchronization is successful, and otherwise, the synchronization is failed.
The GSM cell synchronization device under LTE + GSM dual-card LTE packet switching provided by the embodiment of the invention can reduce the frequency of dropping the LTE data packet on the premise of considering the GSM synchronization performance, reduce the speed influence on the LTE data service, and greatly improve the stability performance of the terminal network.
The embodiment of the invention also provides a mobile terminal which comprises the GSM cell synchronization device under the LTE + GSM dual-card LTE packet switching.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A GSM cell synchronization method under LTE + GSM dual-card LTE packet switching is characterized in that an LTE card resides in an LTE network, a GSM card resides in a GSM network, and a network synchronization task of a GSM neighboring cell or a GSM card cell of the LTE card exists under LTE card packet switching, and the method comprises the following steps:
selecting a position A in a paging channel PCH of the GSM card, wherein the interval between the current position and the position A is the receiving length, the shortest interval is 4 GSM frames plus 1 GSM time slot, other task conflicts do not exist in a first section of cell searching task to be carried out at the current position, and the searching process of the current position is carried out in a GSM 51 multiframe structure;
sending a buffer state BSR (0) to a network side, and recovering the BSR after the cell search task and the paging task are completed;
judging whether the first section of cell searching task finds a GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot;
and when the first section of cell searching task finds the GSM synchronous position at the position where the receiving length is shortest and is 4 GSM frames plus 1 GSM time slot, the synchronization is successful.
2. The method of claim 1, further comprising:
when the first section of cell search task does not find the GSM synchronous position at the position where the receiving length is shortest and 4 GSM frames plus 1 GSM time slot, taking the starting point of the first section of cell search task as a reference, and performing a second section of GSM search task at the position where 51n +8 frames are connected with the next paging task, wherein the GSM paging task exists in the PCCH block of the 51 multiframe, and judging whether the synchronous position of the GSM is found at the position where 51n +8 frames are connected with the next paging task or not by the second section of GSM search task, wherein n is a search period and n is a natural number;
and when the second section of GSM searching task carries out second section of GSM searching at the position connected with the next paging task and with 51n +8 frames, finding out the synchronous position of the GSM, and the synchronization is successful.
3. The method of claim 2, further comprising:
when the second section of GSM searching task does not find the synchronous position of the GSM when the second section of GSM searching task is carried out at the position which is 51n +8 frames and is connected with the next paging task, taking the starting point of the first section of cell searching task as the reference, continuing the third section of GSM searching task at the position which is 51m +4 frames and has no paging conflict, and judging whether the synchronous position of the GSM is found at the position which is 51m +4 frames and has no paging conflict by the third section of GSM searching task, wherein m is a searching period and m is a natural number;
and when the third section of GSM searching task finds the synchronous position of the GSM at the position with 51m +4 frames and without paging conflict, the synchronization is successful, otherwise, the synchronization is failed.
4. A GSM cell synchronization device under LTE + GSM dual-card LTE packet switching is characterized in that an LTE card resides in an LTE network, a GSM card resides in a GSM network, and a network synchronization task of a GSM neighboring cell or a GSM card cell of the LTE card exists under LTE card packet switching, and the device comprises:
the device comprises a selecting unit and a searching unit, wherein the selecting unit is used for selecting a position A in a paging channel PCH of the GSM card, the interval between the current position and the position A is the receiving length, the shortest distance is 4 GSM frames plus 1 GSM time slot, other task conflicts do not exist in a first section of cell searching task to be performed by the current position, and the searching process of the current position is performed in a GSM 51 multiframe structure;
the notification unit is used for sending a buffer state BSR (0) to a network side and recovering the BSR after the cell search task and the paging task are completed;
and the first judging unit is used for judging whether the first section of cell searching task finds the GSM synchronous position at the current position, and when the cell searching task finds the GSM synchronous position at the current position, the synchronization is successful.
5. The apparatus of claim 4, further comprising:
a first search unit, configured to, when the first-stage cell search task does not find a GSM synchronization location at the location where the receive length is shortest and is 4 GSM frames plus 1 GSM timeslot, perform a second-stage GSM search task at a location where 51n +8 frames are connected to a next paging task with reference to the first-stage cell search task start point, where the GSM paging task exists in a PCCH block of the 51 multiframe;
and the second judging unit is used for judging whether the second section of GSM searching task finds the synchronous position of the GSM at the position where 51n +8 frames are connected with the next paging task or not, wherein n is a searching period and is a natural number, and when the second section of GSM searching task carries out second section of GSM searching at the position where 51n +8 frames are connected with the next paging task, the synchronous position of the GSM is found, and the synchronization is successful.
6. The apparatus of claim 5, further comprising:
a second searching unit, configured to, when the second section of GSM search task is performed at a location where 51n +8 frames are connected to a next paging task, find no synchronous location of the GSM, continue to perform a third section of GSM search task at a location where 51m +4 frames are not in paging collision, with the starting point of the first section of cell search task as a reference;
and a third judging unit, configured to judge whether the third GSM search task finds the synchronization position of the GSM at a position where there is no paging collision and in 51m +4 frames, where m is a search period and m is a natural number, and when the third GSM search task finds the synchronization position of the GSM at a position where there is no paging collision and in 51m +4 frames, the synchronization is successful, and otherwise, the synchronization is failed.
7. A mobile terminal characterized in that it comprises the GSM cell synchronization apparatus under LTE + GSM dual card LTE packet switching of any of claims 4 to 6.
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