CN100499861C - Downlink switching method of mobile communication system - Google Patents
Downlink switching method of mobile communication system Download PDFInfo
- Publication number
- CN100499861C CN100499861C CNB2005100867351A CN200510086735A CN100499861C CN 100499861 C CN100499861 C CN 100499861C CN B2005100867351 A CNB2005100867351 A CN B2005100867351A CN 200510086735 A CN200510086735 A CN 200510086735A CN 100499861 C CN100499861 C CN 100499861C
- Authority
- CN
- China
- Prior art keywords
- base station
- district
- sub
- terminal
- channel quality
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
This invention relates to a downlink switch method for a mobile communication system, in which, a terminal utilizes the channel quality result of a downlink time frequency block of same frequency multi-net local areas inside and/or among base stations of a down reference channel measurement base station to help radio networks to switch inside the base stations and /or among them, which fully combines the strongpoint of hard switch among base stations, selection of quick local areas and soft switch in the base stations.
Description
Technical field
The present invention relates to the implementation method of descending switching in a kind of mobile communication system, particularly relate to a kind of implementation method of the descending switching towards packet-optimized broadband wireless system.
Background technology
Modern cell mobile communication systems is in order to guarantee the business continuance under the mobile condition, handoff technique is to solve to guarantee one of traditional solution of communication quality when wireless terminal is crossed over different districts, common changing method can be divided into direct-cut operation and soft handover two classes, direct-cut operation is applied in the gsm communication system widely, and soft handover has been applied in the cdma system, soft handover is one of core technology of cdma system, in CDMA IS-95 system and WCDMA R99 system.Soft handover has remarkable advantages with respect to direct-cut operation, and extra soft handover gain is provided, and has enlarged the sub-district covering, reduced cutting off rate etc., and direct-cut operation has tangible service disconnection process, has influenced quality of service and has caused more switching call drop.Shown in Fig. 1 (a), the process characteristics of direct-cut operation are that a unique link of the terminal and the maintenance of base station links, and interrupt this link then, set up a link with other base stations then and link, and promptly having no progeny earlier connects.Shown in Fig. 1 (b), the characteristics of soft handover are that terminal and base station keep link to link, and insert the link of new base station then, disconnect the link of former base station then, i.e. the process of make-before-break.
But in the R5 of WCDMA version, down link HS-DPCH still prolongs and has used hard-switching technology, and might adopt more fast hard-switching technology as: fast cell or sector are selected, and the soft hand-off that does not adopt performance comparatively to be dominant, its main cause is the business that is based on IP that HS-DPCH mainly carries, the process that connects of having no progeny earlier is very little for the influence of the quality of business, simultaneously because the descending process that has adopted asynchronous HARQ feedback to retransmit, the diversity gain that feedback retransmits has remedied the flow gain of soft handover to a certain extent, and the feedback in the soft handover retransmits needs to carry out between the base station harsh synchronizing process, directly increased the complexity of Signalling exchange, the realization difficulty in present wireless network architecture is very big.
Adopt the more mobile communication system E-UTRA of high bandwidth for a new generation, its design requirement is the requirements such as flow that will reach descending peak value 100Mbps, up peak value 50Mbps, and its descending wireless access way will adopt the novel access mode of OFDMA.Because its design requirement of mobile communication system E-UTRA clearly proposes to optimize towards IP, because the distinctive subcarrier scheduling of OFDMA possesses the characteristic of distributed scheduling and centralized scheduling simultaneously, corresponding changing method need be made more optimal consideration simultaneously.
As shown in Figure 2, because the characteristics of downlink OFDMA multi-access mode, given frequency spectrum is divided into subcarrier to be used for the user, is by the multiple users share time division multiplexing in all time periods, and a certain terminal in most cases can not take all subcarriers or all time receives downlink service data.Terminal is used the centralized carrier assignments mode that is referred to as of subcarrier continuously on frequency spectrum, use the distributed sub-carrier assignment mode that is referred to as of subcarrier at interval.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of downlink switching method of mobile communication system, in the wide-band mobile communication system of identical networking, based on the measurement result of terminal, assist wireless network is carried out down link and is switched, and realizes the optimization of IP operation.
To achieve these goals, the invention provides a kind of downlink switching method of mobile communication system, its characteristics are, the terminal of mobile communication system is utilized the result of channel quality of the temporal frequency piece of each the identical networking cell downlink between descending reference channel measurement inside of base station and/or the base station, and assist wireless network is switched between inside of base station and/or base station.
The downlink switching method of above-mentioned mobile communication system, its characteristics are that this handoff procedure comprises: inside of base station switches, switch between the base station and not only had inside of base station but also have the combination of the multiple switching of switching between the base station; And, select soft handover or fast cell to select at inside of base station according to system load, preferential direct-cut operation or the fast cell selected selected to switch when the network heavy duty surpasses an appointed threshold, and all the other situations preferentially select soft handover to switch; And between the base station, adopt direct-cut operation or fast cell to select to switch.
The downlink switching method of above-mentioned mobile communication system, its characteristics are that for the process that only exists inside of base station to switch, this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink of descending reference channel measurement inside of base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers soft handover, direct-cut operation or the fast cell of the identical networking minizone of inside of base station and selects.
The downlink switching method of above-mentioned mobile communication system, its characteristics are that for only there being the process of switching between the base station, this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink between the descending reference channel measurement base station;
The channel quality that compares common frequency community downlink reference channel between the base station, the down link that triggers the identical networking sub-district between the base station uses hard handover approach or fast cell selection mode to switch.
The downlink switching method of above-mentioned mobile communication system, its characteristics be, for not only having inside of base station but also have the process of the multiple switching of switching between the base station, and inside of base station adopts is the mode of soft handover, and this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink between descending reference channel measurement inside of base station and the base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the soft handover of the identical networking minizone of inside of base station;
Merge the merging down channel quality of the channel quality measurements of the downgoing time frequency chunks of identical networking sub-district in the descending soft handover Active Set as the base station;
The channel quality of the descending reference channel of the merging down channel quality of more some base stations and the identical networking sub-district of other base stations, the down link that triggers between the co-frequency cell of this base station and other base stations uses hard handover approach or fast cell selection mode to switch;
More a plurality of with the merging down channel quality between the frequency base station, trigger a plurality of with use hard handover approach of the down link between the base station or fast cell selection mode switch frequently.
The downlink switching method of above-mentioned mobile communication system, its characteristics are, for not only having inside of base station but also have the process of the multiple switching of switching between the base station, and inside of base station adopts is the mode that direct-cut operation or fast cell are selected, and this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink between descending reference channel measurement inside of base station and the base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the identical networking minizone direct-cut operation or the fast cell of inside of base station and selects;
The channel quality of the descending reference channel quality of master control sub-district, base station and the descending reference channel of the identical networking sub-district of other base stations relatively, the down link use hard handover approach or the fast cell selection mode that trigger between the co-frequency cell of this base station and other base stations switch;
The channel quality of the descending reference channel of the descending reference channel quality of comparison master control sub-district, base station and the identical networking sub-district of other master control sub-districts, base station, the down link that triggers between this base station and other base stations uses hard handover approach or fast cell selection mode to switch.
The downlink switching method of above-mentioned mobile communication system, its characteristics are, the triggering of the soft handover of inside of base station identical networking minizone and soft switching process can be realized by following implementation method, implementation method both had been applicable to centralized carrier assignments mode, also be applicable to distributed carrier assignments mode, this implementation method comprises the steps:
According to different districts the channel quality of downgoing time frequency chunks, in the downgoing time frequency chunks of each cell allocation of the unified scheduling of inside of base station to the terminal use, the temporal frequency piece of every cell scheduling is not overlapping, and selects suitable thresholding and lag time adding or withdraw from the soft handover Active Set;
The base station will send to the business datum of terminal,, cut apart in the downgoing time frequency chunks that is carried to each sub-district by all downgoing time frequency chunks that scheduling distributes according to each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding data of demodulation.
The downlink switching method of above-mentioned mobile communication system, its characteristics are, the triggering of the soft handover of inside of base station identical networking minizone and soft switching process can be realized by following implementation method, implementation method both had been applicable to centralized carrier assignments mode, also be applicable to distributed carrier assignments mode, this implementation method comprises the steps:
According to the temporal frequency piece resource of using in the Active Set, neighbor cell is coordinated identical temporal frequency piece resource, according to the channel quality of downgoing time frequency chunks, selects the adding of suitable thresholding and lag time or withdraws from the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the identical downgoing time frequency chunks of each Active Set sub-district coordinated allocation;
Terminal is in its bandwidth range, and according to original temporal frequency piece positional information, the corresponding business merging of demodulation temporal frequency piece carrying also.
The downlink switching method of above-mentioned mobile communication system, its characteristics are that this implementation method also comprises the steps:
The conversion of the downgoing time frequency chunks of dispatch terminal reception can be unified in the base station;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
The terminal adjustment needs the temporal frequency piece of demodulation.
The downlink switching method of above-mentioned mobile communication system, its characteristics are, the triggering of the soft handover of inside of base station identical networking minizone and soft switching process can be realized by following implementation method, implementation method both had been applicable to centralized carrier assignments mode, also be applicable to distributed carrier assignments mode, this implementation method comprises the steps:
The base station is according to the temporal frequency piece resource of using in the Active Set, and the temporal frequency piece resource that the neighbor cell scheduling can be overlapping according to the channel quality of downgoing time frequency chunks, is selected the adding of suitable thresholding and lag time or withdrawed from the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the downgoing time frequency chunks of phase negative lap of each Active Set sub-district coordinated allocation, cut apart to be carried in the nonoverlapping downgoing time frequency chunks in each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding business data of demodulation temporal frequency piece carrying.
The downlink switching method of above-mentioned mobile communication system, its characteristics are that in the process that this fast cell is selected, the feedback system of its terminal adopts explicit way, and this feeds back explicit process and may further comprise the steps:
Terminal is measured the channel quality of the reference channel of every sub-district;
The channel-quality feedback of each sub-district of receiving is given all sub-districts or master control sub-district;
Community associated judgement or judge the down link of best quality by the master control sub-district;
Data dispatching is by the down link corresponding district emission of best quality;
The time interval according to the rules repeats this process.
The downlink switching method of above-mentioned mobile communication system, its characteristics are that in the process that this fast cell is selected, the feedback system of its terminal adopts the implicit expression mode, and this feedback implicit expression process comprises the steps:
Terminal is measured the channel quality of the reference channel of every sub-district;
The down link of terminal judges best quality;
Terminal feeds back to all sub-districts with best quality down link corresponding district numbering;
Data dispatching is by the sub-district emission that reports numbering;
The time interval according to the rules repeats this process.
Fully based on Soft Handover Algorithm with fully for the direct-cut operation, method of the present invention has following benefit with respect to existing: fully combine the advantage that direct-cut operation between the base station or fast cell select and the advantage of inside of base station soft handover.Adopt direct-cut operation or fast cell to select between the base station, embodied the characteristics of optimizing towards IP, simplified a large amount of Signalling exchanges between HARQ feedback retransmission processes and relevant base station.Inside of base station preferentially adopts the method for soft handover, the characteristics that inside of base station sub-district synchronized transmissions and corresponding HARQ feedback retransmission processes belong to inter-process have been taken into full account, help making full use of the gain of soft handover, improve the covering probability and the transmission rate of cell edge.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Figure 1A is the method for hard switching schematic diagram of system;
Figure 1B is the soft handover method schematic diagram of system;
Fig. 2 A, 2B are respectively the schematic diagrames of centralized carrier wave and distributed carrier wave;
Fig. 3 A is an inside of base station changing method flow chart of the present invention;
Fig. 3 B is a changing method flow chart between the base station of the present invention;
Of the present inventionly not only there is inside of base station in Fig. 3 C but also have the multiple changing method that switches between the base station, and inside of base station adopts is the flow chart of soft handover method;
Of the present inventionly not only there is inside of base station in Fig. 3 D but also have the multiple changing method that switches between the base station, and inside of base station adopts is the flow chart that fast cell is selected;
Fig. 4 is a temporal frequency piece definition schematic diagram of the present invention;
Fig. 5 is the geographic area schematic diagram of soft handover of the present invention, direct-cut operation or fast cell selection mode;
Fig. 6 is the schematic flow sheet of the soft handover method one of identical networking of the present invention minizone;
Fig. 7 is the schematic flow sheet of the soft handover method two of identical networking of the present invention minizone;
Fig. 8 is the schematic flow sheet of the soft handover method three of identical networking of the present invention minizone;
Fig. 9 A is the specific embodiment schematic diagram of first kind of soft handover method of end side of the present invention;
Fig. 9 B is the specific embodiment schematic diagram of second kind of soft handover method of end side of the present invention;
Fig. 9 C is the specific embodiment schematic diagram of the third soft handover method of end side of the present invention;
Figure 10 is the institutional framework of inside of base station of the present invention sub-district;
Figure 11 A, 11B are respectively explicit flow chart of feedback and the feedback implicit expression flow charts that fast cell of the present invention is selected.
Embodiment
As shown in Figure 3, method of the present invention mainly is to be utilized the result of channel quality of the temporal frequency piece of each the identical networking cell downlink between descending reference channel measurement inside of base station and/or the base station by the terminal of mobile communication system, and assist wireless network is switched between inside of base station and/or base station.Its core process comprises: inside of base station switches, switch between the base station and not only had inside of base station but also have the combination of the multiple switching of switching between the base station.
Inside of base station handoff procedure as shown in Figure 3A comprises the steps:
Terminal utilize each identical networking cell downlink of descending reference channel measurement inside of base station temporal frequency piece (chunk) channel quality;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the soft handover or the fast cell of the identical networking minizone of inside of base station and selects.
Handoff procedure between the base station shown in Fig. 3 B comprises the steps:
Terminal utilize each identical networking cell downlink between the descending reference channel measurement base station temporal frequency piece (chunk) channel quality;
The channel quality that compares common frequency community downlink reference channel between the base station, the down link that triggers the identical networking sub-district between the base station uses hard handover approach or fast cell selection mode to switch.
Shown in Fig. 3 C, not only have inside of base station but also have the multiple switching of switching between the base station, and inside of base station adopts is the mode of soft handover, comprise the steps:
Terminal is utilized the channel quality of the temporal frequency piece (chunk) of each identical networking cell downlink between descending reference channel measurement inside of base station and the base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the soft handover of the identical networking minizone of inside of base station;
Merge the merging down channel quality of the channel quality measurements of the downgoing time frequency chunks of identical networking sub-district in the descending soft handover Active Set as the base station;
The channel quality of the descending reference channel of the merging down channel quality of more some base stations and the identical networking sub-district of other base stations, the down link that triggers between the co-frequency cell of this base station and other base stations uses hard handover approach or fast cell selection mode to switch;
More a plurality of with the merging down channel quality between the frequency base station, trigger a plurality of with use hard handover approach of the down link between the base station or fast cell selection mode switch frequently.
Shown in Fig. 3 D, not only have inside of base station but also have the multiple switching of switching between the base station, and inside of base station adopts is the mode that fast cell is selected, comprise the steps:
Terminal utilize each identical networking cell downlink between descending reference channel measurement inside of base station and the base station temporal frequency piece (chunk) channel quality;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the identical networking minizone fast cell of inside of base station and selects;
The channel quality of the descending reference channel quality of master control sub-district, base station and the descending reference channel of the identical networking sub-district of other base stations relatively, the down link use hard handover approach or the fast cell selection mode that trigger between the co-frequency cell of this base station and other base stations switch;
The channel quality of the descending reference channel of the descending reference channel quality of comparison master control sub-district, base station and the identical networking sub-district of other master control sub-districts, base station, the down link that triggers between this base station and other base stations uses hard handover approach or fast cell selection mode to switch.
As previously mentioned, inside of base station switches selects soft handover or fast cell to select to decide according to system load, and the network heavy duty can be paid the utmost attention to fast cell above appointed threshold and select, and all the other situations are selected soft handover.
The triggering of the soft handover of inside of base station identical networking minizone and soft switching process can realize that implementation method both had been applicable to centralized carrier assignments mode, also was applicable to distributed carrier assignments mode by following different implementation method, shown in Fig. 6,7,8:
The step of implementation method one as shown in Figure 6:
According to different districts the channel quality of downgoing time frequency chunks, in the downgoing time frequency chunks of each cell allocation of the unified scheduling of inside of base station to the terminal use, the temporal frequency piece of every cell scheduling is not overlapping, and selects suitable thresholding and lag time adding or withdraw from the soft handover Active Set;
The base station will send to the business datum of terminal,, cut apart in the downgoing time frequency chunks that is carried to each sub-district by all downgoing time frequency chunks that scheduling distributes according to each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding data of demodulation.
The step of implementation method two as shown in Figure 6:
According to the temporal frequency piece resource of using in the Active Set, neighbor cell is coordinated identical temporal frequency piece resource, according to the channel quality of downgoing time frequency chunks, selects the adding of suitable thresholding and lag time or withdraws from the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the identical downgoing time frequency chunks of each Active Set sub-district coordinated allocation;
Terminal is in its bandwidth range, and according to original temporal frequency piece positional information, the corresponding business merging of demodulation temporal frequency piece carrying also.
Wherein, in this implementation method two, also can comprise following steps:
The conversion of the downgoing time frequency chunks of dispatch terminal reception can be unified in the base station;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
The terminal adjustment needs the temporal frequency piece of demodulation.
The step of implementation method three as shown in Figure 8:
The base station is according to the temporal frequency piece resource of using in the Active Set, and the temporal frequency piece resource that the neighbor cell scheduling can be overlapping according to the channel quality of downgoing time frequency chunks, is selected the adding of suitable thresholding and lag time or withdrawed from the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the downgoing time frequency chunks of phase negative lap of each Active Set sub-district coordinated allocation, cut apart to be carried in the nonoverlapping downgoing time frequency chunks in each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel.
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding business data of demodulation temporal frequency piece carrying.
But, be understandable that in the present invention, actual soft handover method is not limited only to above three kinds.
The present invention is described in further detail below in conjunction with drawings and Examples.
The described temporal frequency piece of Fig. 4 is a kind of typical physical resource distribution mode of OFDM/OFDMA system.Whole bandwidth are cut into different subcarriers, and the time also cuts, and the subcarrier of varying number and the time of varying number make up, and constitutes the minimal service data passes unit that distributes to the user.As shown in Figure 4, have 6 users' business respectively on whole temporal frequency resources, the control centre uses for different users distributes different temporal frequency pieces by suitable algorithm.
Take which kind of switching mode can be under the identical networking between inside of base station sub-district, base station between sub-district, base station and sub-district, base station and the base station from the geographic layout (coverage mode or present situation) of the radio-frequency (RF) energy of base station cell, for example by clear and definite the indicating of Fig. 5:
Fig. 5 has described M and two adjacent same frequency base stations of N respectively comprise 1,2,3 and 4,5,6 several internal zones respectively, wherein a, b, c zone are that the zone that inside of base station switches only takes place, in this case, descending soft handover can be triggered or the sub-district is selected fast in 4,5,6 of sub-district 1,2,3 or sub-districts.
Zone d, e are the parts that No. 1 sub-district of base station M overlaps with 5, No. 6 sub-districts of base station N respectively, when the measurement result of the sub-district between the base station 1 and 5 or 1 and 6 triggered descending direct-cut operation or fast cell and selects, sub-district 1 and 5 or 1 and 6 s' down link adopted hard handover approach or fast cell selection mode to switch.
Zone f be base station M No. 1 sub-district simultaneously and the part of 5, No. 6 sub-districts overlappings of base station N, what adopt when the internal zone 5 of base station N and 6 is the method for soft handover, then the descending direct-cut operation of channel quality measurements common trigger of the sub-district 1 of the channel quality measurements (merging down channel quality) after the descending reference combining channel of sub-district 5,6 and base station M or fast cell select condition the time, the mode that the down link between base station N and the sub-district 1 adopts direct-cut operation or fast cell to select is switched.What adopt when the internal zone 5 of base station N and 6 is the method that the sub-district is selected fast, during condition that then the descending direct-cut operation of channel quality measurements common trigger of the sub-district 1 of the descending reference channel quality measurements of certain master control sub-district and base station M or fast cell are selected in the sub-district 5,6, the mode that the down link between base station N and the sub-district 1 adopts direct-cut operation or fast cell to select is switched.
Under suitable condition, when having the condition of selecting when the merging down channel quality of base station and the descending direct-cut operation of merging down channel quality common trigger or the fast cell of other base stations, the down link employing direct-cut operation between the base station or the mode of fast cell selection are switched.
Can be known by inference by Fig. 5, between the base station and minizone is not limited only to man-to-man situation, and the mutual switching of many-one and multi-to-multi is also in protection scope of the present invention.
Having the selection of different soft handover methods in the soft switching process of inside of base station co-frequency cell, is describing of several embodiment below:
Shown in Fig. 9 A is the specific embodiment that first kind of soft handover method adds Active Set:
The scheduler of inside of base station according to different districts the channel quality of downgoing time frequency chunks unify dispatching cell 1,2,3 and distribute to the downgoing time frequency chunks that terminal is used, and select suitable thresholding and lag time that sub-district 1 and 2 is added the soft handover Active Sets.Said temporal frequency piece is not overlapping in each sub-district, and the quantity of the All Time frequency chunks that combines can surpass, and is equal to or less than the quantity allotted before switching;
The downgoing time frequency chunks that the base station is distributed according to sub-district 1,2,3 will send to the business datum of terminal, cut apart in the downgoing time frequency chunks that is carried to each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel; Terminal according to temporal frequency piece positional information, merges the data of each sub-district of demodulation in its bandwidth range.
Shown in Fig. 9 B is the specific embodiment that second kind of soft handover method adds Active Set:
The temporal frequency piece resource that is using according to the sub-district in the Active Set 1 base station is coordinated identical temporal frequency piece resource with neighbor cell 2 and 3, according to the channel quality of downgoing time frequency chunks, selects suitable thresholding and lag time to add the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the identical downgoing time frequency chunks of each Active Set sub-district coordinated allocation;
Terminal is in its bandwidth range, and according to temporal frequency piece positional information, the corresponding business merging of demodulation temporal frequency piece carrying also;
Among the described embodiment, also can comprise following steps:
The conversion of the downgoing time frequency chunks of dispatch terminal reception can be unified in the base station;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
The terminal adjustment needs the temporal frequency piece of demodulation.
Shown in Fig. 9 C is the specific embodiment that the third soft handover method adds Active Set:
According to the temporal frequency piece resource that is using sub-district in the Active Set 1, the temporal frequency piece resource that neighbor cell 2,3 free coordinated schedulings can be overlapping according to the channel quality of downgoing time frequency chunks, selects suitable thresholding and lag time to add Active Set;
The temporal frequency piece resource that enters the cell allocation of Active Set among the figure has overlapping not quite identical again mutually, the base station will send to the business datum of terminal, repeat to be carried in the overlapping downgoing time frequency chunks of each Active Set sub-district coordinated allocation, and cut apart and be carried in the nonoverlapping downgoing time frequency chunks in each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding business data of demodulation temporal frequency piece carrying.
The channel quality measurements that merges the downgoing time frequency chunks of identical networking sub-district in the descending soft handover Active Set is as being implemented with reference to temporal frequency Resource Block of determining among the soft handover embodiment and corresponding merging method in the method for the merging down channel quality of base station.
As shown in figure 10, not only comprise 3 sub-districts in the base station of identical networking of the present invention, also comprise by surpassing 3 inside networking structures that the sub-district constitutes, comprising forms such as the Remote Radio Unit of drawing, repeater and spaced antennas by same base station.
In the present invention, the flow process that fast cell is selected is as follows, the feedback system of its terminal can adopt explicit or the implicit expression dual mode one of them, be depicted as the explicit process of feedback as Figure 11 A:
Terminal is measured the channel quality of the reference channel of every sub-district, as SIR etc.;
Channel quality with each sub-district of receiving as SIR, feeds back to all sub-districts or master control sub-district;
Community associated judgement or judge the down link of best quality by the master control sub-district;
Data dispatching is by the down link corresponding district emission of best quality;
The time interval according to the rules such as TTI repeat this process.
Be depicted as feedback implicit expression process as Figure 11 B:
Terminal is measured the channel quality of the reference channel of every sub-district, as SIR etc.;
The down link of terminal judges best quality;
Terminal feeds back to all sub-districts with best quality down link corresponding district numbering;
Data dispatching is by the sub-district emission that reports numbering;
The time interval according to the rules such as TTI repeat this process.
Difference on the effect of the process of direct-cut operation and fast cell selection here mainly is the speed of this switch speed, because traditional direct-cut operation is for fear of frequent ping-pong, taked comparatively tolerant withdrawing from thresholding and long lag time, so often need the switching time of hundreds of Milliseconds; And the cyclic process that fast cell is selected only needs the switching time of Millisecond generally speaking the soonest with the TTI metering, so the switch speed that fast cell is selected is higher than traditional direct-cut operation far away.Because the variation of switch speed, the handoff gain that causes the fast cell selection approaches the limiting performance of broad sense direct-cut operation also than the handoff gain height of the direct-cut operation in the real system.
The present invention combines direct-cut operation or the advantage of fast cell selection and the advantage of inside of base station soft handover between the base station.Adopt direct-cut operation or fast cell to select between the base station, embodied the characteristics of optimizing towards IP, simplified a large amount of Signalling exchanges between HARQ feedback retransmission processes and relevant base station.Inside of base station preferentially adopts the method for soft handover, the characteristics that inside of base station sub-district synchronized transmissions and corresponding HARQ feedback retransmission processes belong to inter-process have been taken into full account, help making full use of the gain of soft handover, improved the covering probability and the transmission rate of cell edge.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (11)
1, a kind of downlink switching method of mobile communication system, it is characterized in that, the terminal of mobile communication system is utilized the result of channel quality of the temporal frequency piece of each the identical networking cell downlink between descending reference channel measurement inside of base station and/or the base station, assist wireless network is switched between inside of base station and/or base station, and this handoff procedure comprises: inside of base station switches, switch between the base station and not only had inside of base station but also have the combination of the multiple switching of switching between the base station; And, select soft handover or fast cell to select at inside of base station according to system load, preferential direct-cut operation or the fast cell selected selected to switch when the network heavy duty surpasses an appointed threshold, and all the other situations preferentially select soft handover to switch; And between the base station, adopt direct-cut operation or fast cell to select to switch.
2, the downlink switching method of mobile communication system according to claim 1 is characterized in that, for the process that only exists inside of base station to switch, this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink of descending reference channel measurement inside of base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers soft handover, direct-cut operation or the fast cell of the identical networking minizone of inside of base station and selects.
3, the downlink switching method of mobile communication system according to claim 1 is characterized in that, for only there being the process of switching between the base station, this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink between the descending reference channel measurement base station;
The channel quality that compares common frequency community downlink reference channel between the base station, the down link that triggers the identical networking sub-district between the base station uses hard handover approach or fast cell selection mode to switch.
4, the downlink switching method of mobile communication system according to claim 1, it is characterized in that, for not only having inside of base station but also have the process of the multiple switching of switching between the base station, and inside of base station adopts is the mode of soft handover, and this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink between descending reference channel measurement inside of base station and the base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the soft handover of the identical networking minizone of inside of base station;
Merge the merging down channel quality of the channel quality measurements of the downgoing time frequency chunks of identical networking sub-district in the descending soft handover Active Set as the base station;
The channel quality of the descending reference channel of the merging down channel quality of more some base stations and the identical networking sub-district of other base stations, the down link that triggers between the co-frequency cell of this base station and other base stations uses hard handover approach or fast cell selection mode to switch;
More a plurality of with the merging down channel quality between the frequency base station, trigger a plurality of with use hard handover approach of the down link between the base station or fast cell selection mode switch frequently.
5, the downlink switching method of mobile communication system according to claim 1, it is characterized in that, for not only having inside of base station but also have the process of the multiple switching of switching between the base station, and inside of base station adopts is the mode that direct-cut operation or fast cell are selected, and this method comprises following steps:
Terminal is utilized the channel quality of the temporal frequency piece of each identical networking cell downlink between descending reference channel measurement inside of base station and the base station;
Relatively the channel quality of the downgoing time frequency chunks of the identical networking sub-district of inside of base station triggers the identical networking minizone direct-cut operation or the fast cell of inside of base station and selects;
The channel quality of the descending reference channel quality of master control sub-district, base station and the descending reference channel of the identical networking sub-district of other base stations relatively, the down link use hard handover approach or the fast cell selection mode that trigger between the co-frequency cell of this base station and other base stations switch;
The channel quality of the descending reference channel of the descending reference channel quality of comparison master control sub-district, base station and the identical networking sub-district of other master control sub-districts, base station, the down link that triggers between this base station and other base stations uses hard handover approach or fast cell selection mode to switch.
6, according to the downlink switching method of claim 2 or 4 or 5 described mobile communication system, it is characterized in that, the triggering of the soft handover of inside of base station identical networking minizone and soft switching process are realized by following implementation method, implementation method both had been applicable to centralized carrier assignments mode, also be applicable to distributed carrier assignments mode, this implementation method comprises the steps:
Channel quality according to the downgoing time frequency chunks of different districts, in the downgoing time frequency chunks of each cell allocation of the unified scheduling of inside of base station to the terminal use, the temporal frequency piece of every cell scheduling is not overlapping, and selects suitable thresholding and lag time adding or withdraw from the soft handover Active Set;
The base station will send to the business datum of terminal,, cut apart in the downgoing time frequency chunks that is carried to each sub-district by all downgoing time frequency chunks that scheduling distributes according to each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding data of demodulation.
7, according to the downlink switching method of claim 2 or 4 or 5 described mobile communication system, it is characterized in that, the triggering of the soft handover of inside of base station identical networking minizone and soft switching process are realized by following implementation method, implementation method both had been applicable to centralized carrier assignments mode, also be applicable to distributed carrier assignments mode, this implementation method comprises the steps:
According to the temporal frequency piece resource of using in the Active Set, neighbor cell is coordinated identical temporal frequency piece resource, according to the channel quality of downgoing time frequency chunks, selects the adding of suitable thresholding and lag time or withdraws from the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the identical downgoing time frequency chunks of each Active Set sub-district coordinated allocation;
Terminal is in its bandwidth range, and according to original temporal frequency piece positional information, the corresponding business merging of demodulation temporal frequency piece carrying also.
8, the downlink switching method of mobile communication system according to claim 7 is characterized in that, this implementation method also comprises the steps:
The conversion of the downgoing time frequency chunks of dispatch terminal reception is unified in the base station;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
The terminal adjustment needs the temporal frequency piece of demodulation.
9, according to the downlink switching method of claim 2 or 4 or 5 described mobile communication system, it is characterized in that, the triggering of the soft handover of inside of base station identical networking minizone and soft switching process are realized by following implementation method, implementation method both had been applicable to centralized carrier assignments mode, also be applicable to distributed carrier assignments mode, this implementation method comprises the steps:
The base station is according to the temporal frequency piece resource of using in the Active Set, and the temporal frequency piece resource that the neighbor cell scheduling is overlapping according to the channel quality of downgoing time frequency chunks, is selected the adding of suitable thresholding and lag time or withdrawed from the soft handover Active Set;
The base station will send to the business datum of terminal, repeat to be carried in the downgoing time frequency chunks of phase negative lap of each Active Set sub-district coordinated allocation, cut apart to be carried in the nonoverlapping downgoing time frequency chunks in each sub-district;
The base station sends to terminal with the temporal frequency piece positional information of scheduling by control channel;
Terminal in its bandwidth range, according to temporal frequency piece positional information, the corresponding business data of demodulation temporal frequency piece carrying.
According to the downlink switching method of claim 2 or 3 or 4 or 5 described mobile communication system, it is characterized in that 10, in the process that this fast cell is selected, the feedback system of its terminal adopts explicit way, this feeds back explicit process and may further comprise the steps:
Terminal is measured the channel quality of the reference channel of every sub-district;
The channel-quality feedback of each sub-district of receiving is given all sub-districts or master control sub-district;
Community associated judgement or judge the down link of best quality by the master control sub-district;
Data dispatching is by the down link corresponding district emission of best quality;
The time interval according to the rules repeats this process.
According to the downlink switching method of claim 2 or 3 or 4 or 5 described mobile communication system, it is characterized in that 11, in the process that this fast cell is selected, the feedback system of its terminal adopts the implicit expression mode, this feedback implicit expression process comprises the steps:
Terminal is measured the channel quality of the reference channel of every sub-district;
The down link of terminal judges best quality;
Terminal feeds back to all sub-districts with best quality down link corresponding district numbering;
Data dispatching is by the sub-district emission that reports numbering;
The time interval according to the rules repeats this process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100867351A CN100499861C (en) | 2005-10-27 | 2005-10-27 | Downlink switching method of mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100867351A CN100499861C (en) | 2005-10-27 | 2005-10-27 | Downlink switching method of mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1956587A CN1956587A (en) | 2007-05-02 |
| CN100499861C true CN100499861C (en) | 2009-06-10 |
Family
ID=38063619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100867351A Expired - Fee Related CN100499861C (en) | 2005-10-27 | 2005-10-27 | Downlink switching method of mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100499861C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200908760A (en) * | 2007-05-22 | 2009-02-16 | Nec Corp | Signal handover control device, method and program |
| JP4460616B2 (en) * | 2007-11-16 | 2010-05-12 | 株式会社エヌ・ティ・ティ・ドコモ | Cell selection method and mobile station |
| JP5103323B2 (en) * | 2008-08-11 | 2012-12-19 | 株式会社エヌ・ティ・ティ・ドコモ | Radio base station apparatus and mobile terminal apparatus |
| CN101686474B (en) * | 2008-09-24 | 2012-07-04 | 上海摩波彼克半导体有限公司 | Method for realizing rapid cell selection for mobile station in wireless cellular network |
| CN101790215B (en) * | 2009-12-30 | 2016-03-30 | 华为技术有限公司 | Resource regulating method, device and base station |
| US9251321B2 (en) | 2012-10-22 | 2016-02-02 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and nodes for handling usage policy |
| IN2015DN03180A (en) * | 2012-12-19 | 2015-10-02 | Ericsson Telefon Ab L M |
-
2005
- 2005-10-27 CN CNB2005100867351A patent/CN100499861C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1956587A (en) | 2007-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101883406B (en) | Switching method, mobile terminal and base station | |
| CN101282566B (en) | Interference suppression method | |
| CN100499861C (en) | Downlink switching method of mobile communication system | |
| KR100902864B1 (en) | Method for flexible surpoting NON-symmetrical service in multi-carrier TDD mobile communication system | |
| US8238927B2 (en) | OFDM cellular communication method, system and base station | |
| CN101835161B (en) | Dynamic resource allocation method and equipment of multi-cell wireless communication system | |
| CN100464603C (en) | Method for handover in digital cellular communication system using same-frequency netting | |
| US9001734B2 (en) | Method and system for measurement report in coordinated multi-point transmission and reception system | |
| CN101141793B (en) | Switch judging method of mobile communication service and mobile communication system | |
| Ismail et al. | Green radio communications in a heterogeneous wireless medium | |
| CN102257843A (en) | Base station, wireless communication system, base station control method, wireless communication method, control program, and mobile station | |
| CN103607233A (en) | Beam switching method | |
| CN102014393A (en) | Frequency allocation method for multi-point coordinated transmission in cellular communication system | |
| Eriksson | Dynamic single frequency networks | |
| CN103298141B (en) | The carrier multiplexing method that honeycomb communicates with D2D in terminal direct connection hybrid network | |
| WO2012022268A1 (en) | Method and device for selection of collaborative point | |
| CN102143588A (en) | Resource-allocating method for multi-user multi-relay communication system | |
| CN101064920B (en) | Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell | |
| CN101179822B (en) | Method, device and system for implementing soft switch | |
| WO2010123678A1 (en) | Efficient allocation of power to bandwidth in a multi-carrier cellular communication system | |
| Ba et al. | Performance comparison of multi-connectivity with CoMP in 5G ultra-dense network | |
| Ramamoorthi et al. | Energy efficiency in millimeter wave based cellular networks with DUDe and dynamic TDD | |
| CN103281695B (en) | A kind of hop relay network frequency spectrum planing method | |
| CN103199973A (en) | Method and device of multipoint cooperation dispatch | |
| CN102196521A (en) | Switching method for orthogonal frequency division multiplexing (OFDM) cellular relay network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20151027 |
|
| EXPY | Termination of patent right or utility model |