CN102595529B - Switching method and switching system based on multipoint coordination - Google Patents
Switching method and switching system based on multipoint coordination Download PDFInfo
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- 241000760358 Enodes Species 0.000 claims description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
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Abstract
The invention provides a switching method based on multipoint coordination. The switching method comprises the following steps that: after receiving a measurement report reported by a terminal, a source main cell determines a destination main cell, and transmits a switching request message to the destination main cell; after receiving the switching request message, the destination main cell configures resource for the terminal, before or after the terminal switches to the destination main cell, destination cell determines a destination coordination cell set and a destination switching cell set. The invention further provides a switching system based on multipoint coordination. The switching method and the switching system can reduce switching interrupt delay, improve the system throughput while switching, and select a CoMP cell set and a switching cell set again for the UE (user equipment) during or after switching, thus, the UE can get the same server after switching.
Description
Technical field
The present invention relates to LTE_A (Long Term Evolution Advanced, senior Long Term Evolution) system, be specifically related to changing method and system in CoMP (Cooperative Multi-Point, multipoint cooperative) transmission system.
Background technology
In the handoff scenario of existing mobile communication system, conventionally by user's triggering, base station to determine, complete switching flow.For LTE system, UE (User Equipment, while subscriber equipment) communicating in the Serving cell with current, wherein a kind of main application mode is: UE measures RSRP (the Reference Signal Receiving Power of the neighbor cell of current service cell and Serving cell, Reference Signal Received Power) or RSRQ (Reference Signal Receiving Quality, Reference Signal Received Quality), when measuring, UE finds that RSRP or the RSRQ of current connection base station drop to below certain threshold value, and/or in neighbor cell, the RSRP of a certain community or RSRQ rise to after the above also certain time of certain threshold value, trigger switching flow.In handoff procedure, need through information interaction and signalling complicated between UE, cell-of-origin/base station, Target cell/base station.
Because LTE is used quick direct-cut operation mechanism, whenever UE only exists wireless link to connect in He Yige community, as UE, (region that may switch is cell edge normally during in cell edge like this, now quality of wireless channel is poor, presence of intercell interference is strong), handover success rate decreases compared to soft handover, and during switching, the throughput of system also can decline, and the increase of postponing a meeting or conference during handoff.
In LTE_A, introduce after CoMP transmission technology, handoff scenario and flow process will change.Current open complete changing method when the Target cell of UE does not belong to original CoMP cooperation cell collection not still.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of changing method and system based on CoMP, and when improving handover success rate and switching, the throughput of system reduces handoff time delay simultaneously.
In order to address the above problem, the invention provides a kind of changing method based on multipoint cooperative, comprising:
Receive after the measurement report of terminal to report main plot, source, determines target main plot, sends handover request message to described target main plot;
Described target main plot is after receiving described handover request message, for described terminal distribution resource, before described terminal is switched to described target main plot or in described terminal, be switched to behind described target main plot, determine target cooperation cell collection and target switching cell collection.
Further, said method also can have following characteristics, main plot, described source is determined target main plot as follows: in the highest Yi Lei of the medium priority community, community that carry from described measurement report described cell-of-origin, select Yi Ge community as target main plot, wherein, priority principle is:
The priority of other communities of priority > of the community that switching cell, source is concentrated, and there is the priority of other communities of priority > of the community that X2 mouth is connected in the priority > community place eNodeB and main plot, the source place eNodeB that belong to the community of same enode b (eNodeB) with main plot, source.
Further, said method also can have following characteristics, if the highest Yi Lei of the medium priority community, community of carrying in described measurement report belongs to switching cell, source collection, therefrom chooses the minimum community of loading as target main plot; If the highest Yi Lei of the medium priority community, community of carrying in described measurement report does not belong to switching cell, source collection, therefrom choose at random Yi Ge community as target main plot.
Further, said method also can have following characteristics, and described target main plot determines that target cooperation cell collection and target switching cell collection comprise:
Target cooperation cell collection is chosen in described target main plot, each transmission cooperation cell, target cooperation cell request message of concentrating to target cooperation cell, while receiving the refuse information of described target cooperation cell, described target cooperation cell is concentrated and deleted from described target cooperation cell, obtain final target cooperation cell collection;
Target switching cell collection is chosen in described target main plot, each transmission switching cell, target switching cell request message of concentrating to target switching cell, while receiving the refuse information of described target switching cell, described target switching cell is concentrated and deleted from described target switching cell, obtain final target switching cell collection.
Further, said method also can have following characteristics, and target cooperation cell collection and target switching cell collection are chosen according to following mode in described target main plot:
Target cooperation cell collection and target switching cell collection are chosen according to other cell informations in the measurement report of cooperation cell, the source collection information of carrying in described handover request message, switching cell, source collection information and terminal to report in described target main plot.
Further, said method also can have following characteristics, and target cooperation cell collection and target switching cell collection are chosen according to following mode in described target main plot:
Described target main plot is determined and is needed the community of measuring and measure content according to other cell informations in the measurement report of cooperation cell, the source collection information of carrying in described handover request message, switching cell, source collection information and terminal to report, by described, need the community of measuring and measure content to send to main plot, source by switching response message, by main plot, described source, by reallocation message, send described terminal; Or directly by described, need the community of measuring and measure content to send to described terminal;
Described target main plot receives described terminal and is switched to the channel conditions measurement result reporting behind described target main plot, according to described channel conditions measurement result, chooses target cooperation cell collection and target switching cell collection.
Further, said method also can have following characteristics, while choosing target cooperation cell collection, goes back the annexation with reference to community to be selected and described target main plot, while choosing target switching cell collection, go back the annexation of the concentrated community in reference community to be selected and described target cooperation cell.
Further, said method also can have following characteristics, and described method also comprises: described target main plot also sends to described terminal by main plot, source by described target cooperation cell collection information and target switching cell collection information; Or, directly described target cooperation cell collection information and target switching cell collection information are sent to described terminal.
The present invention also provides a kind of switched system based on multipoint cooperative, comprises main plot, source and target main plot, wherein:
Main plot, described source is used for, and receives after the measurement report of terminal to report, determines target main plot, sends handover request message to described target main plot;
Described target main plot is used for, after receiving described handover request message, for described terminal distribution resource, before described terminal is switched to described target main plot or in described terminal, be switched to behind described target main plot, determine target cooperation cell collection and target switching cell collection.
Further, said system also can have following characteristics, and main plot, described source comprises target main plot determining unit:
Described target main plot determining unit is used for: in the highest Yi Lei of the medium priority community, community of carrying at described measurement report, choose Yi Ge community as described target main plot, wherein, priority principle is:
The priority of other communities of priority > of the community that switching cell, source is concentrated, and there is the priority of other communities of priority > of the community that X2 mouth is connected in the priority > community place eNodeB and main plot, the source place eNodeB that belong to the community of same enode b (eNodeB) with main plot, source.
Further, said system also can have following characteristics, described target main plot determining unit be for: if the highest Yi Lei of the medium priority community, community that described measurement report carries belongs to switching cell, source collection, therefrom choose the minimum community of load as described target main plot; If the highest Yi Lei of the medium priority community, community of carrying in described measurement report does not belong to switching cell, source collection, therefrom choose at random Yi Ge community as described target main plot.
Further, said system also can have following characteristics, and described target main plot comprises chooses unit:
Described choose unit for: choose target cooperation cell collection, each transmission cooperation cell, target cooperation cell request message of concentrating to the target cooperation cell of choosing, while receiving the refuse information of described target cooperation cell, described target cooperation cell is concentrated and deleted from described target cooperation cell, obtain final target cooperation cell collection; And,
Choose target switching cell collection, each transmission switching cell, target switching cell request message of concentrating to target switching cell, while receiving the refuse information of described target switching cell, described target switching cell is concentrated and deleted from described target switching cell, obtain final target switching cell collection.
Further, said system also can have following characteristics, described in choose other cell informations in the measurement report that unit is cooperation cell, source collection information, switching cell, source collection information and terminal to report for carrying according to described handover request message and choose target cooperation cell collection and target cooperation cell collection.
Further, said system also can have following characteristics, and described target main plot also comprises measurement triggering unit, wherein:
Described measurement triggering unit is used for: in the measurement report of cooperation cell, the source collection information of carrying according to described handover request message, switching cell, source collection information and terminal to report, other cell informations are determined the community that needs are measured and measure content, by described, need the community of measuring and measure content to send to main plot, source by handoff response information, by main plot, source, by reallocation message, send described terminal; Or the community of directly needs being measured and measurement content send to described terminal;
The described unit of choosing is switched to for receiving described terminal the channel conditions measurement result reporting behind described target main plot, according to described channel conditions measurement result, chooses target cooperation cell collection and target switching cell collection.
Further, said system also can have following characteristics, described in choose unit also when choosing target cooperation cell collection, with reference to the annexation of community to be selected and target main plot, while choosing target switching cell collection, the annexation of the community that reference community to be selected and target cooperation cell are concentrated.
Further, said system also can have following characteristics, described target main plot also for: by main plot, source, described target cooperation cell collection information and target switching cell collection information are sent to described terminal; Or, directly described target cooperation cell collection information and target switching cell collection information are sent to described terminal.
Complete switching flow when the invention provides a kind of Target cell as UE and not belonging to original CoMP cooperation cell collection, the relevant parameter that relates to every single stepping while switching in invention, the choosing method that relates to target main plot, relate to switch neutralization switch after by directly choosing or UE reporting measurement mode is chosen the method for CoMP cell set and switching cell collection, the flow process when relating to Target cell and choosing CoMP cooperation cell.Adopt method of the present invention, even if UE is when switching, also active auxiliary community/main plot continues as UE transmission data, can reduce handoff time delay like this, improve the throughput of system while switching, and for UE reselects CoMP cell set and switching cell collection, make UE can obtain identical service after switching in switching or after switching.
Accompanying drawing explanation
Fig. 1 switches overall procedure;
Fig. 2 is Ji Yu switching cell, cooperation cell collection schematic diagram;
Fig. 3 is that schematic diagram is chosen in target main plot (belonging to switching cell, source collection);
Fig. 4 is that schematic diagram is chosen in target main plot (belonging to other communities);
Fig. 5 directly chooses the switching flow of target side cell set in switching;
Fig. 6 chooses the switching flow of target side cell set by measurement in switching;
Fig. 7 directly chooses the switching flow of target side cell set after switching;
Fig. 8 chooses the switching flow of target side cell set by measurement after switching;
Fig. 9 is each cell set (target main plot belongs to switching cell, source collection) schematic diagram after switching;
Figure 10 is each cell set (target main plot belongs to other communities) schematic diagram after switching.
Embodiment
UE did not belong to the scope of the invention about choosing of above community or cell set before switching, and correspondingly, these concepts can be specially: cooperation cell, source collection, main plot, source, Yuan Fu community, switching cell, source collection.
UE carries out main plot, auxiliary community, cooperation cell collection and choosing of switching cell collection while switching and belongs to the scope of the invention, and correspondingly, these concepts can be specially: target cooperation cell collection, target main plot, target secondary community, target switching cell collection.
The invention provides a kind of changing method based on multipoint cooperative, comprising:
Receive after the measurement report of terminal to report main plot, source, determines target main plot, sends handover request message to described target main plot;
Described target main plot is after receiving described handover request message, for described terminal distribution resource, before described terminal is switched to described target main plot or in described terminal, be switched to behind described target main plot, determine target cooperation cell collection and target switching cell collection.
Specifically describe content of the present invention below, whole switching flow is shown in accompanying drawing 1:
1, the triggering of switching flow
Triggering mode and existing method are similar, adopt UE reporting measurement reports form, measure and report content, can select RSRP/RSRQ/SINR (Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) combination in any in, report condition: when the RSRP/RSRQ/SINR of main plot drops to below certain threshold value, and/or the RSRP/RSRQ/SINR of other communities (Ji Wai community, cooperation cell) rises to the above also certain time of certain threshold value.
2, target main plot chooses
The measurement report that UE sends is received in main plot, source, carries the information that RSRP/RSRQ/SINR meets one or more communities of handoff threshold in measurement report.
Target main plot is determined in main plot, described source: in the highest Yi Lei of the medium priority community, community that carry from described measurement report described cell-of-origin, select Yi Ge community as target main plot, wherein, priority principle is:
The priority of other communities of priority > of the community that switching cell, source is concentrated, and there is the priority of other communities of priority > of the community that X2 mouth is connected in the priority > community place eNodeB and main plot, the source place eNodeB that belong to the community of same enode b (eNodeB) with main plot, source.
Concrete, comprising:
First,, according to the priority principle of " other communities of community > that switching cell, source is concentrated ", screen or classification and ordination measurement report Zhong community main plot, source.
Then, main plot, source is according to the priority principle of " > community, the community place eNodeB that belongs to same eNodeB (Evolved Node B; enode b) with main plot, source exists X2 mouth to be connected other communities of > with main plot, source place eNodeB ", the community screening is on last stage screened or classification and ordination again, or to classification and ordination Hou community on last stage again screening or classification and ordination in all kinds of.
Finally, if the highest Yi Lei of priority community belongs to switching cell, source collection after the community screening or classification and ordination, therefrom choose the minimum community of loading as target main plot, also can select at random; If do not belong to switching cell, source collection, therefrom choose at random Yi Ge community as target main plot.
The execution of 3, switching
Determine behind target main plot, main plot, source sends handover request message to target main plot, include but not limited to service bearer information, switching type, switch reasons, the security information of UE, wireless access capability information, access layer configuration and the radio-resource-configuration of UE of following information: UE in message.Selectively, carry the information of other communities in cooperation cell, source collection information, switching cell, source collection information and measurement report.
Receive after handover request message target main plot, for being about to switch the UE Resources allocation of coming.Selectively, target cooperation cell collection and target switching cell collection are determined according to the relevant information in request message in target main plot, or determine community and measurement content that (choosing cell set required) needs UE to measure.Whether can select this step and select rear concrete which operation of carrying out, depend on the opportunity of choosing of target cooperation cell collection and target switching cell collection and choose mode.
Target main plot sends switching response message to main plot, source.In message, include but not limited to following information: receiving successfully and receive failed UE service bearer information, new measurement configuration, target main plot is C-RNTI (Cell-Radio Network Temporary Identifier, the Radio Network Temporary Identifier that community is relevant), random access channel resource information and the safe relevant configuration that UE distributes.Selectively, carrying target main plot is target cooperation cell collection and the target switching cell collection information that UE chooses, or the community and the measurement content that need UE to measure.
Receive after switching response message main plot, source, issue reallocation message to UE, in message, include but not limited to following information: the DRB that target main plot has been set up (Data Radio Bearer, Data Radio Bearer) and SRB (Signal Radio Bearer, Signaling Radio Bearer) information, new measurement configuration, target main plot be C-RNTI, random access channel resource information and the safe relevant configuration that UE distributes.Selectively, carrying target main plot is target cooperation cell collection and the target switching cell collection information that UE chooses, or the community and the measurement content that need UE to measure.
UE receives after reallocation message, and the DRB information comparison by local DRB information and reallocation message, discharges unnecessary DRB.Then be synchronized to target main plot and to target main plot, initiate random access, after accessing successfully at random, UE sends reprovision and completes message to target main plot.
If main plot, source is handed down to and has been carried target main plot in the reallocation message of UE is the target cooperation cell collection information that UE chooses,, after UE handover success, will transmit data with this target cooperation cell collection.If main plot, source is handed down to, in the reallocation message of UE, has carried the community that UE measures and measured content,, after UE handover success, having carried out to measure also that channel status measurement result is reported to target main plot.Target main plot starts to carry out choosing of target cooperation cell collection and target switching cell collection.
If receive after the handover request message of main plot, source transmission target main plot, is the failure of UE Resources allocation, to respond to switch and prepare failed message to main plot, source, main plot, source will reselect target main plot, then re-execute switching.
4, target cooperation cell collection and target switching cell collection chooses
Target cooperation cell collection and target switching cell collection are chosen by target main plot, selectively, target main plot is after receiving handover request message, choosing of performance objective cell set and target switching cell collection, or at the reprovision of receiving UE, complete after message the choosing of performance objective cell set and target switching cell collection.The choosing afterwards of target cooperation cell collection that be chosen at of target switching cell collection carried out.
The mode of choosing can be selected one of following two kinds of modes:
Mode 1: target main plot is according to the information of other communities in cooperation cell, the source collection information in handover request message, switching cell, source collection information and measurement report, the information such as signal strength signal intensity, load, path loss that considers community is directly carried out choosing of target cooperation cell collection and target switching cell collection.In addition, choosing of target cooperation cell collection also needs to consider this community and target main plot annexation (belonging to same eNodeB > community place eNodeB with target main plot exists X2 mouth to be connected other communities of > with target main plot place eNodeB), and target switching cell collection choose the annexation that need to consider this community and target collaboration set small area.
Mode 2: choosing of target cooperation cell collection and target switching cell collection, with reference to the information of other communities in cooperation cell, the source collection information in handover request message, switching cell, source collection information and measurement report, then carried out by the mode of UE real-time report metrical information in target main plot.Specifically refer to, target main plot requires UE to measure the channel conditions of designated cell, measures content and includes but not limited to RSRP, RSRQ, SINR, CQI, path loss etc.After UE reporting channel situation measurement result, target main plot considers the information such as the channel conditions of each community and load, determines target cooperation cell collection and target switching cell collection.Similarly, choosing of target cooperation cell collection also needs to consider this community and target main plot annexation, and target switching cell collection choose the annexation that need to consider this community and target collaboration set small area.
Determine after the collection of target cooperation cell, transmission cooperation cell, the community request message that target main plot is concentrated to target cooperation cell, includes but not limited to following information in message: the type (Real-time Feedback, periodic feedback) of the information type that whole resource allocation informations of the UE that serve, community need Real-time Feedback (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback).
Receive after the request message of cooperation cell target cooperation cell, determines whether to be ready as auxiliary community, if be ready, according to the information of UE, carry out resource distribution and respond cooperation and accept message, carries out information feedback afterwards according to feedback request.
If target cooperation cell is responded refuse information for some reason, target main plot is concentrated from cooperation cell and is deleted this community.
Selectively, target main plot notice UE cooperation cell collection changes.
Determine after final target cooperation cell collection, transmission switching cell, the community request message that target main plot is concentrated to target switching cell, includes but not limited to following information in message: the type (Real-time Feedback, periodic feedback) of request feedack type (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback).
Target switching cell receives that responding switching cell after the request message of switching cell accepts message, carries out information feedback according to feedback request afterwards.
If community, opposite end is responded refusal for some reason, ring message, target main plot is concentrated from switching cell and is deleted this community.
Selectively, target main plot notice UE switching cell collection changes.
In order to further illustrate the present invention, below in conjunction with drawings and Examples, be elaborated.
The several concepts of paper: cooperation (transmission) cell set, main plot, auxiliary (helping) community, switching cell collection, as shown in Figure 2:
Cooperation cell collection: CoMP collaboration set, for giving the set of cells of same UE service, as accompanying drawing 2 Zhong communities 1,2,3.
Main plot: the community that cooperation cell is concentrated, carry out the United Dispatching that all local resources are concentrated in cooperation cell, and have Signalling exchange with UE, as accompanying drawing 2 Zhong communities 1.
Auxiliary community: the community that cooperation cell is concentrated, assisting main plot is UE service, as accompanying drawing 2 Zhong communities 2,3.
Switching cell collection: this set Zhong community meets but is not limited to following condition: belong to the adjacent area that each community is concentrated in cooperation cell, its signal strength signal intensity will be higher than the first default thresholding, cell load will be lower than the second default thresholding (selectively, the second thresholding changes in real time or periodically according to the resource service condition of UE, and correspondingly switching cell collection also changes in real time or periodically).Main plot has the information on load of these communities.Switching cell collection can be determined jointly by UE, main plot, auxiliary community.As accompanying drawing 2 Zhong communities 5,6,7,8,10,12.And accompanying drawing 2 small areas 9,11,14 respectively due to signal strength signal intensity not, the heavier or other reasons of loading (as, switching cell collection number restriction) cannot belong to switching cell collection.
Embodiment 1: the choosing of target main plot
As shown in Figure 3, the measurement report that UE sends is received in main plot, source, and the community of carrying in report has: community 5, community 6, community 7 and community 16.Because community 5,6,7 belongs to switching cell, source collection, be therefore preferentially used as the candidate cell of target main plot.Again because community 6,7 and main plot, source 1 belong to same eNodeB, thus in Jiang Cong community 6 and community 7, select load less as target main plot.
Embodiment 2: the choosing of target main plot
As shown in Figure 4, the measurement report that UE sends is received in main plot, source, and the community of carrying in report has: community 4, community 13 and community 14, Zhe Sange community all belongs to other communities.Owing to only having community 4 and main plot, source 1 to belong to same eNodeB, be therefore preferred as target main plot.
Embodiment 3: the switching mode of directly choosing target side cell set in switching
As shown in Figure 5, main plot, source is chosen behind target main plot, to target main plot, send handover request message, in message, include but not limited to the information of other communities in service bearer information, switching type, switch reasons, the security information of UE, wireless access capability information, access layer configuration and the radio-resource-configuration of UE, cooperation cell, source collection information, switching cell, source collection information and the measurement report of following information: UE.
Receive after handover request message target main plot, for being about to switch the UE Resources allocation of coming, and according to the information of other communities in cooperation cell, the source collection information in handover request message, switching cell, source collection information and measurement report, consider signal strength signal intensity, load, the path loss of these communities and choose target cooperation cell collection with target main plot annexation, then considering that the annexation of these communities and target collaboration set small area is chosen target switching cell collection.
Transmission cooperation cell, the community request message that target main plot is concentrated to target cooperation cell, includes but not limited to following information in message: the type (Real-time Feedback, periodic feedback) of the information type that whole resource allocation informations of the UE that serve, community need Real-time Feedback (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback).
Receive after the request message of cooperation cell target cooperation cell, determines whether to be ready as auxiliary community, if be ready, according to the information of UE, carry out resource distribution and respond cooperation cell and accept message, carries out information feedback afterwards according to feedback request.
Determine after final target cooperation cell collection, again concentrated community, target switching cell is screened, then the target main plot community transmission switching cell request message concentrated to target switching cell, includes but not limited to following information: the type (Real-time Feedback, periodic feedback) of request feedack type (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback) in message.
Target switching cell receives that responding switching cell after the request message of switching cell accepts message, carries out information feedback according to feedback request afterwards.
Target main plot sends switching response message to main plot, source.In message, include but not limited to following information: receiving successfully with receiving failed UE service bearer information, new measurement configuration, target main plot is UE C-RNTI (Cell-Radio Network Temporary Identifier, the Radio Network Temporary Identifier that community is relevant), random access channel resource information and the safe relevant configuration of distributing to carry target main plot be target cooperation cell collection and the target switching cell collection information that UE chooses.
Receive after switching response message main plot, source, issue reallocation message to UE, in message, include but not limited to following information: the DRB that target main plot has been set up (Data Radio Bearer, Data Radio Bearer) and SRB (Signal Radio Bearer, Signaling Radio Bearer) information, new measurement configuration, target main plot are C-RNTI, random access channel resource information and the safe relevant configuration that UE distributes, and to carry target main plot be target cooperation cell collection and the target switching cell collection information that UE chooses.
UE receives after reallocation message, and the DRB information comparison by local DRB information and reallocation message, discharges unnecessary DRB.Then be synchronized to target main plot and to target main plot, initiate random access, after accessing successfully at random, UE sends reprovision and completes message to target main plot.So far, UE handover success, and with up-to-date cooperation cell collection, carry out the transmission of data.
Embodiment 4: the switching mode of choosing target side cell set in switching by measurement
As shown in Figure 6, main plot, source is chosen behind target main plot, to target main plot, send handover request message, in message, include but not limited to the information of other communities in service bearer information, switching type, switch reasons, the security information of UE, wireless access capability information, access layer configuration and the radio-resource-configuration of UE, cooperation cell, source collection information, switching cell, source collection information and the measurement report of following information: UE.
Receive after handover request message target main plot, for being about to switch the UE Resources allocation of coming, and according to the information of other communities in cooperation cell, the source collection information in handover request message, switching cell, source collection information and measurement report, determine the community and the measurement content that need UE to measure.
Target main plot sends switching response message to main plot, source.In message, include but not limited to following information: receiving successfully and receive failed UE service bearer information, new measurement configuration, target main plot is C-RNTI (the Cell-Radio Network Temporary Identifier that UE distributes, the Radio Network Temporary Identifier that community is relevant), random access channel resource information and safe relevant configuration, and carry and need the community that UE measures and measure content.
Receive after switching response message main plot, source, issue reallocation message to UE, in message, include but not limited to following information: the DRB that target main plot has been set up (Data Radio Bearer, Data Radio Bearer) and SRB (Signal Radio Bearer, Signaling Radio Bearer) information, new measurement configuration, target main plot are C-RNTI, random access channel resource information and the safe relevant configuration that UE distributes, and carry community and the measurement content that needs UE to measure.
UE receives after reallocation message, and the DRB information comparison by local DRB information and reallocation message, discharges unnecessary DRB.Then be synchronized to target main plot and to target main plot, initiate random access, after accessing successfully at random, UE sends reprovision and completes message to target main plot.So far, UE handover success, but now can only carry out with target main plot the transmission of data.
UE carries out and measures and channel status measurement result is reported to target main plot.Target main plot is according to the measurement result reporting, consider signal strength signal intensity, load, the path loss of these communities and choose target cooperation cell collection with target main plot annexation, then considering that the annexation of these communities and target collaboration set small area is chosen target switching cell collection.
Transmission cooperation cell, the community collection request message that target main plot is concentrated to target cooperation cell, includes but not limited to following information in message: the type (Real-time Feedback, periodic feedback) of the information type that whole resource allocation informations of the UE that serve, community need Real-time Feedback (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback).Receive after cooperation request message target cooperation cell, determines whether to be ready as auxiliary community, if be ready, according to the information of UE, carry out resource distribution and respond cooperation and accept message, carries out information feedback afterwards according to feedback request.Target main plot notifies UE cooperation cell collection to change by reallocation message, and UE returns to reprovision and completes message to target main plot.So far, UE carries out the transmission of data with up-to-date cooperation cell collection.
Determine after final target cooperation cell collection, again concentrated community, target switching cell is screened, then the target main plot community transmission switching cell request message concentrated to target switching cell, includes but not limited to following information: the type (Real-time Feedback, periodic feedback) of request feedack type (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback) in message.Target switching cell receives that responding switching cell after the request message of switching cell accepts message, carries out information feedback according to feedback request afterwards.Target main plot notifies UE switching cell collection to change by reallocation message.UE returns to reprovision and completes message to target main plot.
Embodiment 5: the switching mode of directly choosing target side cell set after switching
As shown in Figure 7, main plot, source is chosen behind target main plot, to target main plot, send handover request message, in message, include but not limited to the information of other communities in service bearer information, switching type, switch reasons, the security information of UE, wireless access capability information, access layer configuration and the radio-resource-configuration of UE, cooperation cell, source collection information, switching cell, source collection information and the measurement report of following information: UE.
Receive after handover request message target main plot, for being about to switch the UE Resources allocation of coming.Then send switching response message to main plot, source.In message, include but not limited to following information: receiving successfully and receive failed UE service bearer information, new measurement configuration, target main plot is C-RNTI (Cell-Radio Network Temporary Identifier, the Radio Network Temporary Identifier that community is relevant), random access channel resource information and the safe relevant configuration that UE distributes.
Receive after switching response message main plot, source, issue reallocation message to UE, in message, include but not limited to following information: the DRB that target main plot has been set up (Data Radio Bearer, Data Radio Bearer) and SRB (Signal Radio Bearer, Signaling Radio Bearer) information, new measurement configuration, target main plot be C-RNTI, random access channel resource information and the safe relevant configuration that UE distributes.
UE receives after reallocation message, and the DRB information comparison by local DRB information and reallocation message, discharges unnecessary DRB.Then be synchronized to target main plot and to target main plot, initiate random access, after accessing successfully at random, UE sends reprovision and completes message to target main plot.So far, UE handover success, but now can only carry out with target main plot the transmission of data.
Now, the information of other communities in cooperation cell, source collection information, switching cell, source collection information and measurement report before the basis of main plot in handover request message, consider signal strength signal intensity, load, the path loss of these communities and choose target cooperation cell collection with target main plot annexation, then considering that the annexation of these communities and target collaboration set small area is chosen target switching cell collection.
Transmission cooperation cell, the community collection request message that target main plot is concentrated to target cooperation cell, includes but not limited to following information in message: the type (Real-time Feedback, periodic feedback) of the information type that whole resource allocation informations of the UE that serve, community need Real-time Feedback (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback).
Receive after cooperation request message target cooperation cell, determines whether to be ready as auxiliary community, if be ready, according to the information of UE, carry out resource distribution and respond cooperation and accept message, carries out information feedback afterwards according to feedback request.Notice UE cooperation cell, target main plot collection changes.So far, UE carries out the transmission of data with up-to-date cooperation cell collection.
Determine after final target cooperation cell collection, again concentrated community, target switching cell is screened, then the target main plot community transmission switching cell request message concentrated to target switching cell, includes but not limited to following information: the type (Real-time Feedback, periodic feedback) of request feedack type (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback) in message.
Target switching cell receives that responding switching cell after the request message of switching cell accepts message, carries out information feedback according to feedback request afterwards.Notice UE switching cell, target main plot collection changes.
Embodiment 6: the switching mode of choosing target side cell set after switching by measurement
As shown in Figure 8, main plot, source is chosen behind target main plot, to target main plot, send handover request message, in message, include but not limited to the information of other communities in service bearer information, switching type, switch reasons, the security information of UE, wireless access capability information, access layer configuration and the radio-resource-configuration of UE, cooperation cell, source collection information, switching cell, source collection information and the measurement report of following information: UE.
Receive after handover request message target main plot, for being about to switch the UE Resources allocation of coming.Then send switching response message to main plot, source.In message, include but not limited to following information: receiving successfully and receive failed UE service bearer information, new measurement configuration, target main plot is C-RNTI (Cell-Radio Network Temporary Identifier, the Radio Network Temporary Identifier that community is relevant), random access channel resource information and the safe relevant configuration that UE distributes.
Receive after switching response message main plot, source, issue reallocation message to UE, in message, include but not limited to following information: the DRB that target main plot has been set up (Data Radio Bearer, Data Radio Bearer) and SRB (Signal Radio Bearer, Signaling Radio Bearer) information, new measurement configuration, target main plot be C-RNTI, random access channel resource information and the safe relevant configuration that UE distributes.
UE receives after reallocation message, and the DRB information comparison by local DRB information and reallocation message, discharges unnecessary DRB.Then be synchronized to target main plot and to target main plot, initiate random access, after accessing successfully at random, UE sends reprovision and completes message to target main plot.So far, UE handover success, but now can only carry out with target main plot the transmission of data.
Now, the information of other communities in cooperation cell, source collection information, switching cell, source collection information and measurement report before the basis of target main plot in handover request message, determines the community and the measurement content that need UE to measure.Then issue reallocation message to UE, require UE to measure the channel conditions of designated cell, measure content and include but not limited to RSRP, RSRQ, SINR, CQI, path loss etc.UE receives after reallocation message, carries out and measures and channel status measurement result is reported to target main plot.Target main plot is according to the measurement result reporting, consider signal strength signal intensity, load, the path loss of these communities and choose target cooperation cell collection with target main plot annexation, then considering that the annexation of these communities and target collaboration set small area is chosen target switching cell collection.
Transmission cooperation cell, the community collection request message that target main plot is concentrated to target cooperation cell, includes but not limited to following information in message: the type (Real-time Feedback, periodic feedback) of the information type that whole resource allocation informations of the UE that serve, community need Real-time Feedback (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback).Receive after cooperation request message target cooperation cell, determines whether to be ready as auxiliary community, if be ready, according to the information of UE, carry out resource distribution and respond cooperation and accept message, carries out information feedback afterwards according to feedback request.Notice UE cooperation cell, target main plot collection changes.So far, UE carries out the transmission of data with up-to-date cooperation cell collection.
Determine after final target cooperation cell collection, again concentrated community, target switching cell is screened, then the target main plot community transmission switching cell request message concentrated to target switching cell, includes but not limited to following information: the type (Real-time Feedback, periodic feedback) of request feedack type (as: Radio Resource behaviour in service, cable resource behaviour in service), feedback, feedback thresholding (can select during Real-time Feedback), feedback cycle (periodic feedback) in message.Target switching cell receives that responding switching cell after the request message of switching cell accepts message, carries out information feedback according to feedback request afterwards.Notice UE switching cell, target main plot collection changes.
Embodiment 7: the choosing of target cooperation cell and target switching cell
As shown in Figure 9, while belonging to switching cell, source collection for target main plot, the target cooperation cell of finally choosing and target switching cell.Its small area 6 is target main plot, and community 1 (main plot, source), 5 is target secondary community (community that switching cell, source is concentrated); Community 4,7,15,16,17 ownership target switching cell collection.Though community 2,3,14 is the adjacent area of concentrated community, target cooperation cell, because signal strength signal intensity cannot belong to target switching cell collection not, although community 18 signal strength conditions meet, loads heavier, also cannot belong to target switching cell collection.
As shown in Figure 10, while belonging to other communities for target main plot, the target cooperation cell of finally choosing and target switching cell.Its small area 4 is target main plot, and community 1 (main plot, source), 3 (Yuan Fu communities) are target secondary community; Community 2 (Yuan Fu community), 5,12,14 ownership target switching cell collection.Though community 6,7,10,11 is the adjacent area of concentrated community, target cooperation cell, because signal strength signal intensity cannot belong to switching cell collection not, although community 13 signal strength conditions meet, loads heavier, also cannot belong to target switching cell collection.
The present invention also provides a kind of switched system based on multipoint cooperative, comprises main plot, source and target main plot, wherein:
Main plot, described source is used for, and receives after the measurement report of terminal to report, determines target main plot, sends handover request message to described target main plot;
Described target main plot is used for, after receiving described handover request message, for described terminal distribution resource, before described terminal is switched to described target main plot or in described terminal, be switched to behind described target main plot, determine target cooperation cell collection and target switching cell collection.
Wherein, main plot, described source comprises target main plot determining unit:
Described target main plot determining unit is used for: in the highest Yi Lei of the medium priority community, community of carrying at described measurement report, choose Yi Ge community as described target main plot, wherein, priority principle is:
The priority of other communities of priority > of the community that switching cell, source is concentrated, and there is the priority of other communities of priority > of the community that X2 mouth is connected in the priority > community place eNodeB and main plot, the source place eNodeB that belong to the community of same enode b (eNodeB) with main plot, source.
Described target main plot determining unit be for: if the highest Yi Lei of the medium priority community, community that described measurement report carries belongs to switching cell, source collection, therefrom choose the minimum community of load as described target main plot; If the highest Yi Lei of the medium priority community, community of carrying in described measurement report does not belong to switching cell, source collection, therefrom choose at random Yi Ge community as described target main plot.
Wherein, described target main plot comprises and chooses unit:
Described choose unit for: choose target cooperation cell collection, each transmission cooperation cell, target cooperation cell request message of concentrating to the target cooperation cell of choosing, while receiving the refuse information of described target cooperation cell, described target cooperation cell is concentrated and deleted from described target cooperation cell, obtain final target cooperation cell collection; And,
Choose target switching cell collection, each transmission switching cell, target switching cell request message of concentrating to target switching cell, while receiving the refuse information of described target switching cell, described target switching cell is concentrated and deleted from described target switching cell, obtain final target switching cell collection.
Describedly choose other cell informations in the measurement report that unit is cooperation cell, source collection information, switching cell, source collection information and terminal to report for carrying according to described handover request message and choose target cooperation cell collection and target cooperation cell collection.
Described target main plot also comprises measurement triggering unit, wherein:
Described measurement triggering unit is used for: in the measurement report of cooperation cell, the source collection information of carrying according to described handover request message, switching cell, source collection information and terminal to report, other cell informations are determined the community that needs are measured and measure content, by described, need the community of measuring and measure content to send to main plot, source by handoff response information, by main plot, source, by reallocation message, send described terminal; Or the community of directly needs being measured and measurement content send to described terminal;
The described unit of choosing is switched to for receiving described terminal the channel conditions measurement result reporting behind described target main plot, according to described channel conditions measurement result, chooses target cooperation cell collection and target switching cell collection.
Wherein, described in choose unit also when choosing target cooperation cell collection, the annexation with reference to community to be selected with target main plot, while choosing target switching cell collection, the annexation of the community that reference community to be selected and target cooperation cell are concentrated.
Wherein, described target main plot also for: by main plot, source, described target cooperation cell collection information and target switching cell collection information are sent to described terminal; Or, directly described target cooperation cell collection information and target switching cell collection information are sent to described terminal.
Claims (14)
1. the changing method based on multipoint cooperative, is characterized in that, comprising:
Receive after the measurement report of terminal to report main plot, source, determines target main plot, sends handover request message to described target main plot;
Described target main plot is after receiving described handover request message, for described terminal distribution resource, before described terminal is switched to described target main plot or in described terminal, be switched to behind described target main plot, determine target cooperation cell collection and target switching cell collection;
Described target main plot determines that target cooperation cell collection and target switching cell collection comprise:
Target cooperation cell collection is chosen in described target main plot, each transmission cooperation cell, target cooperation cell request message of concentrating to target cooperation cell, while receiving the refuse information of described target cooperation cell, described target cooperation cell is concentrated and deleted from described target cooperation cell, obtain final target cooperation cell collection;
Target switching cell collection is chosen in described target main plot, each transmission switching cell, target switching cell request message of concentrating to target switching cell, while receiving the refuse information of described target switching cell, described target switching cell is concentrated and deleted from described target switching cell, obtain final target switching cell collection.
2. the method for claim 1, it is characterized in that, main plot, described source is determined target main plot as follows: in the highest Yi Lei of the medium priority community, community that carry from described measurement report described cell-of-origin, select Yi Ge community as target main plot, wherein, priority principle is:
The priority of other communities of priority > of the community that switching cell, source is concentrated, and there is the priority of other communities of priority > of the community that X2 mouth is connected in the priority > community place eNodeB and main plot, the source place eNodeB that belong to the community of same enode b (eNodeB) with main plot, source.
3. method as claimed in claim 2, is characterized in that, if the highest Yi Lei of the medium priority community, community of carrying in described measurement report belongs to switching cell, source collection, therefrom chooses the minimum community of loading as target main plot; If the highest Yi Lei of the medium priority community, community of carrying in described measurement report does not belong to switching cell, source collection, therefrom choose at random Yi Ge community as target main plot.
4. the method for claim 1, is characterized in that, target cooperation cell collection and target switching cell collection are chosen according to following mode in described target main plot:
Target cooperation cell collection and target switching cell collection are chosen according to other cell informations in the measurement report of cooperation cell, the source collection information of carrying in described handover request message, switching cell, source collection information and terminal to report in described target main plot.
5. the method for claim 1, is characterized in that, target cooperation cell collection and target switching cell collection are chosen according to following mode in described target main plot:
Described target main plot is determined and is needed the community of measuring and measure content according to other cell informations in the measurement report of cooperation cell, the source collection information of carrying in described handover request message, switching cell, source collection information and terminal to report, by described, need the community of measuring and measure content to send to main plot, source by switching response message, by main plot, described source, by reallocation message, send described terminal; Or directly by described, need the community of measuring and measure content to send to described terminal;
Described target main plot receives described terminal and is switched to the channel conditions measurement result reporting behind described target main plot, according to described channel conditions measurement result, chooses target cooperation cell collection and target switching cell collection.
6. the method for claim 1, it is characterized in that, while choosing target cooperation cell collection, go back the annexation with reference to community to be selected and described target main plot, while choosing target switching cell collection, go back the annexation of the concentrated community in reference community to be selected and described target cooperation cell.
7. the method as described in as arbitrary in claim 1 to 5, is characterized in that, described method also comprises: described target main plot also sends to described terminal by main plot, source by described target cooperation cell collection information and target switching cell collection information; Or, directly described target cooperation cell collection information and target switching cell collection information are sent to described terminal.
8. the switched system based on multipoint cooperative, is characterized in that, comprises main plot, source and target main plot, wherein:
Main plot, described source is used for, and receives after the measurement report of terminal to report, determines target main plot, sends handover request message to described target main plot;
Described target main plot is used for, after receiving described handover request message, for described terminal distribution resource, before described terminal is switched to described target main plot or in described terminal, be switched to behind described target main plot, determine target cooperation cell collection and target switching cell collection;
Target main plot comprises chooses unit:
Described choose unit for: choose target cooperation cell collection, each transmission cooperation cell, target cooperation cell request message of concentrating to the target cooperation cell of choosing, while receiving the refuse information of described target cooperation cell, described target cooperation cell is concentrated and deleted from described target cooperation cell, obtain final target cooperation cell collection; And,
Choose target switching cell collection, each transmission switching cell, target switching cell request message of concentrating to target switching cell, while receiving the refuse information of described target switching cell, described target switching cell is concentrated and deleted from described target switching cell, obtain final target switching cell collection.
9. system as claimed in claim 8, is characterized in that, main plot, described source comprises target main plot determining unit:
Described target main plot determining unit is used for: in the highest Yi Lei of the medium priority community, community of carrying at described measurement report, choose Yi Ge community as described target main plot, wherein, priority principle is:
The priority of other communities of priority > of the community that switching cell, source is concentrated, and there is the priority of other communities of priority > of the community that X2 mouth is connected in the priority > community place eNodeB and main plot, the source place eNodeB that belong to the community of same enode b (eNodeB) with main plot, source.
10. system as claimed in claim 9, it is characterized in that, described target main plot determining unit be for: if the highest Yi Lei of the medium priority community, community that described measurement report carries belongs to switching cell, source collection, therefrom choose the minimum community of load as described target main plot; If the highest Yi Lei of the medium priority community, community of carrying in described measurement report does not belong to switching cell, source collection, therefrom choose at random Yi Ge community as described target main plot.
11. systems as claimed in claim 8, is characterized in that,
Describedly choose other cell informations in the measurement report that unit is cooperation cell, source collection information, switching cell, source collection information and terminal to report for carrying according to described handover request message and choose target cooperation cell collection and target cooperation cell collection.
12. systems as claimed in claim 8, is characterized in that, described target main plot also comprises measurement triggering unit, wherein:
Described measurement triggering unit is used for: in the measurement report of cooperation cell, the source collection information of carrying according to described handover request message, switching cell, source collection information and terminal to report, other cell informations are determined the community that needs are measured and measure content, by described, need the community of measuring and measure content to send to main plot, source by handoff response information, by main plot, source, by reallocation message, send described terminal; Or the community of directly needs being measured and measurement content send to described terminal;
The described unit of choosing is switched to for receiving described terminal the channel conditions measurement result reporting behind described target main plot, according to described channel conditions measurement result, chooses target cooperation cell collection and target switching cell collection.
13. systems as claimed in claim 8, it is characterized in that, described in choose unit also when choosing target cooperation cell collection, with reference to the annexation of community to be selected and target main plot, while choosing target switching cell collection, the annexation of the community that reference community to be selected and target cooperation cell are concentrated.
14. systems as described in as arbitrary in claim 8 to 13, is characterized in that, described target main plot also for: by main plot, source, described target cooperation cell collection information and target switching cell collection information are sent to described terminal; Or, directly described target cooperation cell collection information and target switching cell collection information are sent to described terminal.
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| CN201110002077.9A CN102595529B (en) | 2011-01-06 | 2011-01-06 | Switching method and switching system based on multipoint coordination |
| PCT/CN2011/082919 WO2012092799A1 (en) | 2011-01-06 | 2011-11-25 | Handover method and system based on coordinated multi-point |
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| JP6034491B2 (en) * | 2012-08-07 | 2016-11-30 | ▲ホア▼▲ウェイ▼技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Handover processing method and base station |
| GB2507821A (en) * | 2012-11-13 | 2014-05-14 | Samsung Electronics Co Ltd | Generating measurement reports in a wireless communications network employing coordinated multi-point transmissions |
| CN103945470A (en) * | 2013-01-18 | 2014-07-23 | 华为技术有限公司 | Switching method, source communication node and target communication node |
| WO2014126345A1 (en) | 2013-02-15 | 2014-08-21 | Samsung Electronics Co., Ltd. | Mobile terminal handover in an lte network |
| CN104219717B (en) * | 2013-05-31 | 2018-07-24 | 中国移动通信集团公司 | A kind of system that method, base station and the terminal of terminal switching switch |
| CN104301953A (en) * | 2013-07-16 | 2015-01-21 | 电信科学技术研究院 | Method and device for coordinating multi-point transmission control during cell switching |
| CN104301954A (en) * | 2013-07-17 | 2015-01-21 | 中兴通讯股份有限公司 | Switching method, device, base stations and system |
| CN105991255B (en) * | 2015-01-28 | 2019-04-23 | 中国移动通信集团广东有限公司 | A kind of configuration method and device of carrier wave polymerization |
| JP2019510445A (en) | 2016-04-01 | 2019-04-11 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Mobility management method, apparatus, and system |
| WO2020164073A1 (en) * | 2019-02-14 | 2020-08-20 | Oppo广东移动通信有限公司 | Condition-triggered configuration method and related product |
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