CN103546930A - Method for cell switchover suitable for TD-LTE public network trunking system - Google Patents
Method for cell switchover suitable for TD-LTE public network trunking system Download PDFInfo
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Abstract
The invention discloses a method for cell switchover suitable for a TD-LTE public network trunking system. The method for cell switchover suitable for the TD-LTE public network trunking system comprises the steps that when a group composed of a plurality of mobile radio stations conducts cross-cell switchover, a temporary small network is constituted by the mobile radio stations needing switchover according to a preset threshold; a bridge group user is selected from the small network, wherein two sets of transceivers are assembled to the bridge group user so that communication can be conducted on networks at two different frequencies at the same time; information sent by a source base station is transmitted to other group users in the temporary small network by the bridge group user. Switchover from the source access station to a target access station is achieved through the bridge group user and after the bridge group user enters a target network, the other group users sequentially enter the target access station through negotiation between the bridge group user and the target access station. According to the scheme, collision in the process of switchover of the group is remarkably reduced, so that time of interruption of services of the mobile radio stations is reduced, and the mobile radio stations are compatible with an existing wireless network.
Description
Technical field
The present invention relates to wireless communication field, in particular to a kind of cell switching method of TD-LTE public network group system.
Background technology
Development along with the 4th third generation mobile communication network, trunked communication system also will be to the trunked communication system evolution of the 4th generation, traditional trunked communication system be take private network as main, for meeting the requirement of the aspect such as Business Nature, environment for use of different industries department, formed various trunked communication system.But for departments such as general enterprises, logistics, communications and transportation, these industry departments require relatively lowly to cluster network, take and embody economic benefit as main.Therefore these departments generally adopt the public access mobile radio of shared frequency resource and network infrastructure, or employing provides the mode of group service to realize command scheduling function in public mobile communication system.Together with the public network system integration of public network group system needs and operator, make full use of public network access network resource, resources of core network and operation management resource, do not affect that public network service and public network service can organicly coexist, the digital colony network of efficient compatible, shared resource.
In cluster network, often there will be user's while handover of Yi Ge group, owing to being the network that public's system and group system coexist, so the time delay of switching may become higher due to collision, reduce the success rate of switching.In the railway system, also have this situation, when train fast moving, on train, a large number of users needs handover simultaneously.By installation car microscope carrier ON TRAINS, can effectively reduce handover delay, improve handover success rate.But installation car microscope carrier is very difficult in cluster user, how the in the situation that of at installation car microscope carrier not, effectively improve the handover success rate of group user, reduce the break period of user in handoff procedure, in correlation technique, not yet propose effective solution at present.
The invention discloses a kind of cell switching method of the 4th generation public group system, can be used for group user to switch and be optimized.
In the patent that is CN201210074697.8 at application number, disclosing a kind of LTE switch determining method and device basis based on TA compares with agreement fiducial value to the TA value of UE terminal to report, the different state obtaining is carried out to increment operation, thereby statistics draws the mobile trend of UE terminal, according to this mobile trend, carry out decision process, can improve the accuracy of switch decision, improve eNB hand-off process performance.Cell switching method and device in a kind of LTE network are disclosed in the patent that is CN201210324808.6 at application number, by base station, receiving the measurement report based on power that UE uploads sorts to the Reference Signal Received Power of each adjacent area and information on load, according to overall ranking select target community, thereby increase network utilization, improve handover success rate.A kind of group service adaptive optimization changing method based on requirement forecasting and priority is disclosed in the patent that is CN200810207636.8 at application number, according to factors such as quality of service, terminal, type of service, terminal pattern, switching demands, two kinds of pre-switch demand thresholdings are set, call the associated weight matrix in analytic hierarchy process (AHP) weight matrix database, obtain treating the queue of pre-switch service priority.The present invention has improved switching efficiency, has increased network gain.In the patent that is CN200880130195.4 at application number, disclose a kind of method and apparatus switching for wireless network group, will contain a plurality of users' group, by source base station, all information of this group user have been sent to target BS.The present invention has reduced the expense of signaling in group handoff procedure and the duration that group is switched significantly, thereby has reduced the time that service to mobile stations interrupts, and can be compatible with existing wireless network.
In current patent, there is no the changing method for a large amount of group user are switched in public network group system simultaneously, but all information of group user are sent to target BS from source base station together, but not all group user all can be switched in actual situation, and the suitable switching of group user and at that time user's parameter information also cannot determine.
Summary of the invention
For above deficiency of the prior art, the object of the present invention is to provide a kind of collision having reduced in group's handoff procedure, thereby reduced the time that service to mobile stations interrupts, and can with the cell switching method that is suitable for TD-LTE public network group system of existing wireless network compatibility.Technical scheme of the present invention is as follows: a kind of cell switching method that is suitable for TD-LTE public network group system, in its small area, comprise common group user MS, bridge group user BNS and source base station BS1, community is outside equipped with target BS BS2, and described cell switching method comprises the following steps:
When the signal strength values that 101, receives source base station BS1 as common group user MS is less than threshold value M1, common group user MS signalling of bouquet handover request is to source base station BS1, this source base station BS1 is according to the cluster handover request receiving, send switching command to bridge group user BNS, and sending handover acknowledge request to common group user MS simultaneously, this handover acknowledge request comprises that common group user MS is connected to the destination channel information of bridge group user BNS;
102, common group user MS sends and measures connection request to bridge group user BNS according to the handover acknowledge request receiving in step 101, this bridge group user BNS send to measure connects acknowledges requests and provides and measures channel to common group user MS, a casual network of bridge group user BNS and common group user MS formation;
When the signal strength values that 103, the bridge group user BNS in step 102 receives source base station BS1 is less than threshold value M2, the connection of bridge group user BNS disconnection and source base station BS1, and send access control request to target BS BS2, this target BS BS2 sends handoff response to bridge group user BNS, access is carried out in bridge group user BNS request, this target BS BS2 Resources allocation to bridge group user BNS;
104, the bridge group user BNS request target base station BS 2 that accesses target BS BS2 in step 103 distributes measurement channel to common group user MS, common group user MS replys and request target base station BS 2 is carried out measurement and is connected, this target BS BS2 Resources allocation realizes the transmission of Frame to common group user MS, completes the handoff procedure of domestic consumer.
Further, the bridge group user in step 102 and step 103 and the interconnection network of common group user MS are mobile ad-hoc networks, Wimax, or WLAN.
Further, described bridge group user installation has at least two cover transceivers, allows simultaneously to communicate at the network of two different frequencies.
Advantage of the present invention and beneficial effect are as follows:
The present invention is leading other group user to carry out moving across community by bridge group user, and in order to collision and the signaling storm that prevents that a large number of users from bringing while switching simultaneously, wherein bridge group user is a member who belongs in this group.By this changing method, can improve the handover success rate that a large amount of group user move across community simultaneously, reduce handoff time delay.
Accompanying drawing explanation
Fig. 1 is that the group user in the preferred embodiment of the present invention moves schematic diagram;
Fig. 2 is changing method schematic diagram of the present invention;
Fig. 3 is changing method schematic block diagram of the present invention;
Fig. 4 is changing method flow chart of the present invention;
Fig. 5 is used unique user handover delay analogous diagram in the group of changing method in the present invention.
Embodiment
The invention will be further elaborated below in conjunction with accompanying drawing, to provide the embodiment of an indefiniteness.But should be appreciated that, these descriptions are exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, omitted the description to known features and technology, to avoid unnecessarily obscuring concept of the present invention.
Figure 1 shows that the group user mobile context schematic diagram of this method, can see that the user of You Yige group needs handover simultaneously.
Figure 2 shows that changing method schematic diagram of the present invention.
Fig. 3 shows changing method flow chart of the present invention.In step 301, a large amount of group user in same group need to be carried out handover simultaneously.In step 302, common group user is lower than the switching thresholding of getting redy to start off, join the casual network being formed by the bridge user of group, by bridge group user forwarding information, wherein switching preparation threshold M1 can recently determine for the pilot signal strength of user's reception sources community and Target cell, and the M1 that mentioned is here that pilot signal strength is than being M1=1.2.Step 303 has pointed out that bridge group user leading connected common group user to carry out moving across community.In step 304, bridge group user meets the handover trigger thresholding of unique user, fill order's subscriber handover process, wherein switching preparation threshold M2 can recently determine for the pilot signal strength of user's reception sources community and Target cell, the M2 that mentioned is here that pilot signal strength is than being M2=0.9.In step 305, common group user is in target BS region, can by predefined time window function orderly add target BS.
Fig. 4 is changing method flow chart of the present invention, and a kind of cell switching method that is suitable for TD-LTE public network group system, comprises the following steps:
Source base station is received the measurement report of common group user, determining whether to initiate group switches, if initiate group's switching, notify bridge group user to prepare to accept common group user, and send response message to common group user, bridge group user also sends response message to source base station.
Domestic consumer is connected in the casual network of bridge group user composition, starts the data that acceptance is forwarded by bridge group user.Thereby complete handoff preparation phase.
Bridge group user is carried out the handover at alone family, source base station is received the measurement report of bridge group user, by X2 mouth or S1 mouth, to target BS, send handover request (Handover Request) message, this switching includes but not limited to the switching that mobility triggers.During Handover Request is careful including but not limited to RRC context, the UE ability of UE and the ready message that re-establishes that comprises handover source base station information.Bridge group user reconnects to target BS by measurement, authentication, registration, and so far handover execution stage completes.
Common group user is distributed measuring machine meeting and the resource that reenters target BS, and common group user is connected to target BS in order, and so far, whole handoff algorithms completes.
Figure 5 shows that unique user handover delay analogous diagram in the group that uses changing method in the present invention.From figure, we can see, a lot of group user, owing to using traditional changing method, have produced a large amount of collisions when a large number of users switches, and have caused higher handover delay, and changing method in use the present invention can be avoided a large number of users to produce switching collision, reduce handover delay.
These embodiment are interpreted as only for the present invention is described, is not used in and limits the scope of the invention above.After having read the content of record of the present invention, technical staff can make various changes or modifications the present invention, and these equivalences change and modification falls into cell switching method claim limited range of the present invention equally.
Claims (3)
1. a cell switching method that is suitable for TD-LTE public network group system, in its small area, comprise common group user MS, bridge group user BNS and source base station BS1, community is outside equipped with target BS BS2, it is characterized in that, described cell switching method comprises the following steps:
When the signal strength values that 101, receives source base station BS1 as common group user MS is less than threshold value M1, common group user MS signalling of bouquet handover request is to source base station BS1, this source base station BS1 is according to the cluster handover request receiving, send switching command to bridge group user BNS, and sending handover acknowledge request to common group user MS simultaneously, this handover acknowledge request comprises that common group user MS is connected to the destination channel information of bridge group user BNS;
102, common group user MS sends and measures connection request to bridge group user BNS according to the handover acknowledge request receiving in step 101, this bridge group user BNS send to measure connects acknowledges requests and provides and measures channel to common group user MS, a casual network of bridge group user BNS and common group user MS formation;
When the signal strength values that 103, the bridge group user BNS in step 102 receives source base station BS1 is less than threshold value M2, the connection of bridge group user BNS disconnection and source base station BS1, and send access control request to target BS BS2, this target BS BS2 sends handoff response to bridge group user BNS, access is carried out in bridge group user BNS request, this target BS BS2 Resources allocation to bridge group user BNS;
104, the bridge group user BNS request target base station BS 2 that accesses target BS BS2 in step 103 distributes measurement channel to common group user MS, common group user MS replys and request target base station BS 2 is carried out measurement and is connected, this target BS BS2 Resources allocation realizes the transmission of Frame to common group user MS, completes the handoff procedure of domestic consumer.
2. the cell switching method that is suitable for TD-LTE public network group system according to claim 1, it is characterized in that: the bridge group user in step 102 and step 103 and the interconnection network of common group user MS are mobile ad-hoc networks, Wimax, or WLAN.
3. the cell switching method that is suitable for TD-LTE public network group system according to claim 1, is characterized in that: described bridge group user installation has at least two cover transceivers, allows simultaneously to communicate at the network of two different frequencies.
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