CN1601948A - Method for clustered user's terminal switching between small zones - Google Patents
Method for clustered user's terminal switching between small zones Download PDFInfo
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Abstract
Group calling channel is built for each sub-zone in service area of cluster service. In procedure of user's terminal of cluster moving from a sub zone to adjacent sub zone, the method includes following steps: (a) the user's terminal of cluster tests signal in adjacent sub zone, when switching condition is reached, the user's terminal of the cluster starts up switching request information; (b) with switching request information being received and based on service information of the cluster stored, network side determines whether the user is needed to switch to group calling channel in adjacent sub zone; if yes, response information is sent to the user's terminal, then executing step C; otherwise ending the flow; (c) with response information being received, the user's terminal is switched to group calling channel in adjacent sub zone. The invention provides switching function between different sub zones for users in cluster so as to guarantee quality of communication.
Description
Technical field
The present invention relates to Digital Clustering communication field, be meant the changing method of a kind of cluster user terminal between the sub-district especially based on CDMA technology.
Background technology
Wireless cluster communication system hereinafter to be referred as group system, is a kind of mobile communication system that is mainly used in command scheduling, is widely used in fields such as government bodies, energy traffic, airport harbour, industrial and mining enterprises.Group system provides group service for cluster user, and wherein basic service is voice group call service (VGCS, Voice Group Call Service).VGCS requires group system to set up calling in the coverage of affiliated cluster group for cluster user.The coverage can be made up of some sub-districts that belong to same mobile switching centre (MSC) or different MS C administration, and when group calling was initiated, a group-calling channel was set up in this group calling of respectively doing for oneself of each related cell, and the cluster user of this cluster group is shared group-calling channel.
Group system of the present invention is based on the group system of CDMA technology.Cluster user is a wireless terminal, and therefore in the trunking communication process, moving of cluster user may be crossed over different districts.At present, do not propose as yet under cdma network, when cluster user is crossed over the sub-district, the changing method of cluster user terminal between the sub-district.Along with moving of user terminal, the user crosses neighbor cell, if former sub-district was set up the group-calling channel of distributing to this cluster group and is carried out communication when this user still used group calling to initiate, then can be because of the restriction of cell signal power, a little less than signal became, the user terminal reception quality message can obviously descend.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of switching based on the cluster user of CDMA technology between the sub-district, and cluster user can be switched in different minizones, guarantees communication quality.
Realize the present invention, need following steps:
A) this cluster user terminal detects the signal of neighbor cell, arrives the condition of switching, and the cluster user terminal is initiated handoff request information;
B) network side receives handoff request information, the group service information of having stored according to network side judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends;
C) this cluster user terminal is received switching request response information, user terminal is switched on the group-calling channel of neighbor cell.
Wherein, the described switching condition of steps A comprises: the signal strength signal intensity height of the signal intensity ratio current area of neighbor cell.
Wherein, the handoff request information of the described cluster user terminal initiation of steps A further comprises: cell-of-origin sign, Target Cell Identifier and cluster group id.
Wherein, the described group service information of having stored according to network side of step B judges whether the step that this cluster user terminal switches on the group-calling channel of neighbor cell is further comprised: network side judges whether the Target cell in the handoff request information that receives is the coverage of this group.
Wherein, the described switching request response information of step B further comprises: the shared channel information and the group identification of Target Cell Identifier, Target cell.
Wherein, current area and neighbor cell belong to a BSC administration together, step B comprises: network side BSC receives handoff request information, the group service information of having stored according to BSC judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if, then send switching request response information, execution in step C, otherwise process ends to this cluster user terminal.
Wherein, current area and neighbor cell belong to MSC, a different B SC administration together, and step B may further comprise the steps:
B1) BSC receives handoff request message, determines that Target cell is not to belong to this BSC to administer, the MSC under BSC is transmitted to this handoff request information;
B2) after MSC receives handoff request information, confirm that Target cell is the compass of competency at oneself, sends handoff request message to its subordinate's target BS C;
B3) after target BS C receives handoff request message, the group service information of having stored according to target BS C judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if, then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends.
Wherein, current area and neighbor cell belong to different MS C administration, and step B may further comprise the steps:
B1) BSC receives handoff request message, determines that Target cell is not to belong to this BSC to administer, the MSC under BSC is transmitted to this handoff request information.
B2) after MSC receives handoff request information, confirm that Target cell is not the compass of competency at oneself, then sends handoff request message to adjacent target MSC.
B3) after target MSC is received handoff request message, confirm that Target cell is the compass of competency at oneself, sends handoff request message to its subordinate's target BS C.
B4) after target BS C receives handoff request message, the group service information of having stored according to target BS C judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if, then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends.
By said method as can be seen, the invention solves under cdma network, cluster user moves when crossing over the sub-district, switching problem between the sub-district makes in the group system based on CDMA technology, and cluster user can switch in different minizones, when crossing over the sub-district, it is that the shared channel that this cluster group sets up in advance carries out communication that this user can use neighbor cell, guarantees that the signal of user terminal reception is clear, has enlarged the moving range of cluster user under the cdma network accordingly.
Description of drawings
Fig. 1 is the group system networking schematic diagram based on CDMA technology.
Fig. 2 is the flow chart that user terminal switches at different districts.
Fig. 3 is the user terminal flow chart that different districts switches under same BSC.
Fig. 4 is the user terminal flow chart that different districts switches under same MSC, different B SC.
Fig. 5 is the user terminal flow chart that different districts switches under different MS C.
Embodiment
Group system is respectively current group and sets up shared radio traffic channel as group-calling channel, for the user who is dispersed in this group in each sub-district provides group service in each sub-district of coverage.This channel is not at the independent assignment of certain user, when some cluster user in this cluster group switch former sub-district after, the shared radio traffic channel of former sub-district is not removed, still other users for this group in the sub-district provide service.Equally, when the cluster user of these other sub-districts of cluster group switches to current area, the shared radio traffic channel of this sub-district is directly offered this user use, and need not to build in addition channel.
For making purpose of the present invention, technical scheme and advantage clearer, below by specific embodiment with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is cluster system group network figure under the CDMA technology.As shown in Figure 1, the cdma network side comprises base station transceiver (BTS), base station controller (BSC) and MSC/VLR at least.When group service is found in certain cluster establishment, each sub-district in its coverage is set up the shared channel of this cluster group separately, and, when setting up group service, MSC, BSC store corresponding group service information, comprise cell list that group identification, coverage are contained etc.
Fig. 2 is the flow chart that user terminal switches at different districts.Wherein, user terminal is the cluster user that is carrying out the VGCS business, and this terminal is the current sub-district that group-calling channel is provided by the cell-of-origin, is that Target cell moves to neighbor cell, and handoff procedure may further comprise the steps:
Step 201: this cluster user terminal is to neighbor cell, the signal strength signal intensity that is Target cell detects, when arriving switching condition, stronger than the wireless signal of the cell-of-origin of the current use of conversing as the wireless signal that detects Target cell, then user terminal sends handoff request information.Carry information such as cell-of-origin sign, Target Cell Identifier, cluster group id in this handoff request information.
Step 202: network side receives the handoff request information that user terminal sends, and reads cell-of-origin sign, Target Cell Identifier and group identification.The group service information that network side is stored when setting up group service judges whether to switch.
Network side is according to the group service of being preserved, judge that Target cell in the handoff request information is whether in the coverage of this group, if, then return handoff response information to terminal, indicating terminal switches, carry Target Cell Identifier in the switching request response information, the shared channel information of Target cell, information such as group identification; Otherwise, return the information that corresponding refusal switches, process ends to terminal.
Step 203: the cluster user terminal receives the switching request response information that network side sends, and then according to the indication of this information, user terminal is switched on the shared channel of Target cell, continues current VGCS business.
Wherein, switching may occur between the different districts under the same BSC, may occur under the same MSC under the different B SC between the sub-district, may occur between the sub-district under the different MS C.Therefore the described network side relevant with switching may only comprise a BSC above, perhaps also comprises a MSC and another BSC, perhaps also comprises another MSC.
The dispatcher of hypothesis set group business has initiated the VGCS business of 8080 groups.MSC/VLR receives and saveset group business information, and in the signatory coverage of this group, set up the wireless sharing channel according to the CAMEL-Subscription-Information of this group, suppose that cell-of-origin and Target cell all belong to the coverage of this group, and set up the wireless sharing channel separately.The cluster user of current use cell-of-origin channel communication is moving to Target cell, describes the changing method of the minizone under the different situations in detail as example.
Fig. 3 is the user terminal flow chart that different districts switches under same BSC.In Fig. 1, Target cell is that sub-district 2 and cell-of-origin are that sub-district 1 is administered by same BSC1, and 1 handoff procedure that moves to sub-district 2 may further comprise the steps user terminal from the sub-district:
Step 301: the user is in the process that Target cell moves, the signal of cell-of-origin more and more a little less than, and the signal of Target cell is more and more stronger, the signal that detects Target cell when user terminal is stronger than the signal of cell-of-origin, when satisfying the condition of handover trigger, then user terminal is initiated handoff request information to BSC1, has carried Target Cell Identifier in the request message, the cell-of-origin sign, information such as group identification.
After step 302:BSC1 receives this handoff request information, the Serving cell example table of preserving when setting up group service, with group identification, the Target cell in the handoff request message, confirm that sub-district 2 belongs to the coverage of this group, by switching request response information the shared channel information of sub-district 2 is sent to user terminal then, indication is switched, simultaneously, BSC1 handles accordingly, as meets net, notice MSC etc.
Step 303: user terminal receives the switching request response information that BSC1 sends, according to entrained Target Cell Identifier, and the shared channel information of Target cell, relevant informations such as group identification switch on the shared channel of Target cell.
Fig. 4 is the user terminal flow chart that different districts switches under same MSC, different B SC.As Fig. 1, sub-district 3 is a Target cell, and promptly cell-of-origin and Target cell belong to BSC1 and BSC2 administration respectively, and 1 handoff procedure that moves to sub-district 3 may further comprise the steps user terminal from the sub-district:
Step 401: identical with last routine step 301, the signal that user terminal detects Target cell is stronger than the signal of cell-of-origin, when satisfying the condition of handover trigger, then user terminal is initiated handoff request information to BSC1, carried Target Cell Identifier in the request message, the cell-of-origin sign, information such as group identification.
After step 402:BSC1 received this handoff request message, the Target Cell Identifier entrained according to this information determined that Target cell is not that BSC1 administers, and the MSC1 under BSC1 is transmitted to this handoff request information handles.
After step 403:MSC1 receives handoff request information, confirm that Target cell is the compass of competency at oneself, and send handoff request message, carried relevant informations such as Target cell, group identification in the message to its subordinate's target BS C2.
After step 404: target BS C receives handoff request message, according to the Serving cell example table of having preserved, confirm that Target cell is in the coverage of this group, directly the shared channel information of having set up in the Target cell is sent to affiliated MSC by handover request ack message, MSC should ask response information message to issue user terminal by source BSC1, and indicating user terminal is directly switch on the shared channel of Target cell.
Step 405: identical with last routine step 303.User terminal receives the switching request response information that BSC1 sends, according to entrained Target Cell Identifier, and the shared channel information of Target cell, relevant informations such as group identification switch on the shared channel of Target cell.
Fig. 5 is the user terminal flow chart that different districts switches under different MS C.As Fig. 1, sub-district 4 is a Target cell, and promptly cell-of-origin and Target cell belong to MSC1 and MSC2 administration respectively, and 1 handoff procedure that moves to sub-district 4 may further comprise the steps user terminal from the sub-district:
Step 501 is identical to 402 with last example 401 to step 502.
After step 503:MSC1 receives handoff request information, confirm that Target cell is not the compass of competency at oneself, then send handoff request message, carried relevant informations such as Target cell, group identification in the message to adjacent target MSC 2.
After step 504:MSC2 receives handoff request message, send handoff request message, carried relevant informations such as Target cell, group identification in the message to its subordinate's target BS C3.
Step 505 to 506 is identical with last example 404,405.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, the method between the sub-district, switched of a kind of cluster user terminal, group system is set up group-calling channel respectively in each sub-district of group service coverage, the cluster user terminal moves to the process of neighbor cell from a sub-district, it is characterized in that, this method may further comprise the steps:
A, this cluster user terminal detect the signal of neighbor cell, arrive the condition of switching, and the cluster user terminal is initiated handoff request information;
B, network side receive handoff request information, the group service information of having stored according to network side judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends;
C, this cluster user terminal are received switching request response information, user terminal are switched on the group-calling channel of neighbor cell.
2, method according to claim 1 is characterized in that, the described switching condition of steps A comprises: the signal strength signal intensity height of the signal intensity ratio current area of neighbor cell.
3, method according to claim 1 is characterized in that, the handoff request information that the described cluster user terminal of steps A is initiated further comprises: cell-of-origin sign, Target Cell Identifier and cluster group id.
4, method according to claim 1, it is characterized in that the described group service information of having stored according to network side of step B judges whether the step that this cluster user terminal switches on the group-calling channel of neighbor cell is further comprised: network side judges whether the Target cell in the handoff request information that receives is the coverage of this group.
5, method according to claim 1 is characterized in that, the described switching request response information of step B further comprises: the shared channel information and the group identification of Target Cell Identifier, Target cell.
6, method according to claim 1 is characterized in that, current area and neighbor cell belong to a BSC administration together, and step B comprises:
Network side BSC receives handoff request information, the group service information of having stored according to BSC judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends.
7, method according to claim 1 is characterized in that, current area and neighbor cell belong to MSC, a different B SC administration together, and step B comprises:
B1, BSC receive handoff request message, determine that Target cell is not to belong to this BSC to administer, the MSC under BSC is transmitted to this handoff request information;
After B2, MSC receive handoff request information, confirm that Target cell is the compass of competency at oneself, sends handoff request message to its subordinate's target BS C;
After B3, target BS C receive handoff request message, the group service information of having stored according to target BS C judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if, then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends.
8, method according to claim 1 is characterized in that, current area and neighbor cell belong to different MS C administration, and step B comprises:
B1, BSC receive handoff request message, determine that Target cell is not to belong to this BSC to administer, the MSC under BSC is transmitted to this handoff request information.
After B2, MSC receive handoff request information, confirm that Target cell is not the compass of competency at oneself, then sends handoff request message to adjacent target MSC.
After B3, target MSC are received handoff request message, confirm that Target cell is the compass of competency at oneself, sends handoff request message to its subordinate's target BS C.
After B4, target BS C receive handoff request message, the group service information of having stored according to target BS C judges whether this cluster user terminal is switched on the group-calling channel of neighbor cell, if, then send switching request response information to this cluster user terminal, execution in step C, otherwise process ends.
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| WO2005125224A1 (en) * | 2004-06-22 | 2005-12-29 | Huawei Technologies Co., Ltd. | Method for the secret listening mobile station to receive voice after cell reselection |
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| CN107466067A (en) * | 2016-09-21 | 2017-12-12 | 海能达通信股份有限公司 | A kind of group-calling service switching method, system, base station and terminal |
| CN107466067B (en) * | 2016-09-21 | 2021-11-02 | 海能达通信股份有限公司 | Group call service switching method, system, base station and terminal |
| WO2018195858A1 (en) * | 2017-04-27 | 2018-11-01 | 海能达通信股份有限公司 | Method for switching group calling cell, and base station |
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| CN100440768C (en) | 2008-12-03 |
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