CN101141793A - Switch judging method of mobile communication service and mobile communication system - Google Patents

Switch judging method of mobile communication service and mobile communication system Download PDF

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Publication number
CN101141793A
CN101141793A CNA2006101287945A CN200610128794A CN101141793A CN 101141793 A CN101141793 A CN 101141793A CN A2006101287945 A CNA2006101287945 A CN A2006101287945A CN 200610128794 A CN200610128794 A CN 200610128794A CN 101141793 A CN101141793 A CN 101141793A
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subchannel
channels
sub
base station
travelling carriage
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CN101141793B (en
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王莹
许宁
李明菊
张平
陶小峰
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention provides a mobile communication service switching decision method. The invention is characterized in that the method comprises the quality of the signal channel measurement of the mobile station. The switching decision entity obtains the average value of the signal channel quality, and a plurality of base stations are selected as the candidate base stations according to the sequence of the average value from the larger to the smaller, and the switching request signaling containing the mobile stable service request information is transmitted to the candidate base stations; the candidate base stations judges whether to be switched into the mobile station through the received mobile station service request information, if the candidate base stations can be switched, the candidate base stations can return back to the affirmative signaling and the sub-signal channel information required by the service; in the candidate base stations with returned affirmative signaling, the switching decision entity selects the largest average value of the signal channel quality as the target base station, and transmits the switching instruction to the base station; corresponding to the method, the invention also provides a mobile communication service switching decision system, and the system comprises: a measurement unit, a computing unit, a selection unit, and a judgment unit.

Description

Mobile communication service switching decision method and mobile communication system
Technical field
The present invention relates to the changing method in the mobile communication system, relate in particular to the changing method of OFDMA (OFDM access) mobile communication system and SC-FDMA (single-carrier frequency division multiple access access) mobile communication system.
Background technology
In mobile communication system, the network entity that relates to switching comprises: the serving BS of travelling carriage, the base station of travelling carriage neighbor cell, the switch decision entity that control is switched.Handoff procedure is generally controlled by the switch decision entity, it can be positioned at serving BS, also can be positioned at radio network controller (Radio NetworkController) or IAD (Access Gateway), depend on the network configuration that mobile communication system is adopted when implementing.Between handover decision function entity and serving BS and adjacent base station interface is arranged, can the command transmitting data.Fig. 1 provides the schematic diagram of system.In Fig. 1, travelling carriage need switch to other base station from current serving BS.The reason that triggers handover event may be that travelling carriage has moved to the edge that serving BS covers or has been subjected to stronger interference or because load control, to such an extent as to exist other base station to provide better service for travelling carriage.
OFDMA is a kind of multiple access technique based on OFDM (OFDM) modulation system, and each subcarrier only is that a travelling carriage carries out transfer of data in the time slot.The physical resource of OFDMA system air interface can be regarded 2 dimension Resource Block as shown in Figure 2 as, and the base station is that travelling carriage distributes one or more Resource Block interface transmitting data aloft according to certain dispatching criterion based on channel conditions.Because the frequency domain multi-user diversity gain is given travelling carriage allocated channel quality subchannel preferably, then can improve systematic function.For adopting SC-FDMA is the system of access mode, and its physical resource can equivalence be the form of Fig. 2 also.If system adopts Adaptive Modulation and Coding (AMC), when channel quality is good, can use the modulating-coding combination of higher level; And when channel quality is relatively poor, can adopt more low-level modulating-coding combination, further enhanced system performance.
In the middle of the switching mode of conventional OFDMA mobile communication system and other system, the pilot tone average of moving table measuring serving BS and adjacent other base stations is safeguarded the tabulation of a candidate base station; When needs initiated to switch, according to certain criterion, for example pilot frequency intensity average maximum was selected one as target BS in a plurality of candidate base stations, sends handoff request by the switch decision entity; After target BS is received handoff request, be the subchannel of travelling carriage preassignment some, select suitable transmission means (modulating-coding combination), to satisfy the business demand of travelling carriage.Distribution result can be by switch decision entity notice travelling carriage, or after target BS and travelling carriage are set up control channel, directly notifies travelling carriage by target BS; Travelling carriage is adjusted the physical layer receive mode according to distribution result, sets up being connected of transfer of data with target BS.
Usually certain resource can be reserved for inserting the use of switching travelling carriage in the base station.Will waste the large volumes of channels resource because providing of broadband multimedia services, base station are reserved the mode of abundant resource assurance handover success, so the base station can reduce amount of resources reserved by access control before permitting switching the travelling carriage access.The access control mode of unpromising switching travelling carriage design specialized in the existing switching mode.And common access control mode has two classes, and a class is based on the access control of channel status, utilizes the channel characteristics of OFDMA frequency selective fading, and the channel conditions current according to travelling carriage is its preassignment of carrying out resource, judges that can it insert; Another kind of is the business demand that only needs to know travelling carriage, does not consider the channel characteristics of the frequency selective fading that travelling carriage is current, and channel resource preassignment is at random.
The method of first kind of access control, because target BS is known the channel quality requirement of each subchannel of travelling carriage, can avoid poor subchannel is distributed to travelling carriage, reduced the probability of decreased performance behind the switching mobile station to target base station, thereby can be travelling carriage comparatively stable QoS (quality of service) is provided, promptly improved the success rate of access control.But this kind pursued the maximized method of QoS, needs the channel information of all subchannels of feedback, will increase the load of signaling channel greatly.
Second kind of connection control method do not need the feedback of channel information, be directly switch to the targeted website, so signaling consumption is very little.But,, can only carry out resource allocation to it immediately because the channel quality requirement of each subchannel of travelling carriage is not known in the targeted website.This resource allocation has at random increased the probability that travelling carriage takies the subchannel that is in deep fade, makes performance of handoffs descend the poor-performing of i.e. access control.
Summary of the invention
The problem to be solved in the present invention provides a kind of mobile communication service switching decision method and system, uses this method and system, can be implemented on the basis of keeping less feedback signaling load, makes the user obtain satisfied professional handed over service.For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions:
The moving table measuring quality of channel;
The switch decision entity obtains the average of described channel quality, and selects a plurality of base stations as candidate base station according to the descending order of average, and sends the handoff request signaling that comprises the mobile station service demand information respectively to a plurality of candidate base stations;
Can candidate base station is judged by the mobile station service demand information that receives insert the switching travelling carriage, if could would return sure signaling and professional required subchannel information;
The switch decision entity in returning the candidate base station of sure signaling, selective channel quality average maximum as target BS, send to this base station and to switch indication.
Wherein, described mobile station service demand information comprises the candidate base station subchannel information and professional required number of sub-channels of agreement;
Can candidate base station is judged in the candidate base station subchannel of making an appointment select professional required number of sub-channels, if can then insert the switching travelling carriage; And choose the reservation subchannel of professional requirement, return to the switch decision entity.
Wherein, the Forecasting Methodology of the number of sub-channels that described business is required is: the transmission means that travelling carriage uses as the switching back by a kind of modulating-coding combination of system default, according to the operation quality requirement of travelling carriage or the agreement of the grade of service, calculate professional needed number of sub-channels.
Wherein, the method for agreement candidate sub-channel information is:
In each candidate base station, according to the channel quality quality, order selects the subchannel of some; And described number of sub-channels is greater than the required number of sub-channels of business.
Wherein, the method for choosing the reservation subchannel of professional requirement is: the subchannel ordering of giving the reservation of selecting according to the quality of channel quality; If unappropriated channel quantity is not less than professional required channel quantity in the subchannel of reservation, then according to the channel quality quality, the reservation subchannel of selective sequential free time; If the unappropriated number of channel is less than the required channel quantity of business, then according to the quality of channel quality, order is chosen professional required channel quantity, and the user of busy channel is dispatched on other subchannels of the subchannel that does not belong to reservation.
Wherein, described mobile station service demand information comprises travelling carriage quality of service requirement QoS;
Each candidate base station obtains each downlink sub-channels information of this travelling carriage; According to described downlink sub-channels information and travelling carriage quality of service requirement, can judgement insert the switching travelling carriage.
Wherein, the method that described candidate base station obtains each downlink sub-channels information of this travelling carriage is: candidate base station is measured the ascending pilot channel of travelling carriage, obtain up each subchannel information, by the reciprocity of system's up-downgoing channel, obtain this base station to switching descending each subchannel information of travelling carriage.
Wherein, described mobile station service demand information comprises professional required number of sub-channels;
Candidate base station judges that then picked at random went out the subchannel of this quantity, and the subchannel information of selecting is returned to the switch decision entity when its idle sub-channels was not less than professional required number of sub-channels.
Wherein, when candidate base station is judged its idle sub-channels less than the required number of sub-channels of business, then discharge the channel that has taken,, the subchannel information of selecting is returned to the switch decision entity if channel that discharges and the channel quantity of free time reach professional required number of sub-channels.
Wherein, the method that obtains the required number of sub-channels of business is: behind a plurality of candidate base stations of switch decision entity selection, by the travelling carriage QoS requirement of precognition, calculate the professional required number of sub-channels that needs under the modulating-coding combination of system default.
Wherein, after sending the switching indication, this base station further comprises:
Switch decision entity indication travelling carriage carries out synchronously with target BS, on the travelling carriage subchannel that distributes, accepts the data of target BS by the modulation coding mode that presets, and with target BS execution switching.
For realizing said method, the present invention also provides a kind of system, and this system comprises:
Measuring unit, computing unit, selected cell, judging unit;
Measuring unit is used to measure the channel quality of travelling carriage, and measurement data is sent to computing unit;
Computing unit is used for calculating the channel quality average and average being reported to selected cell by measurement data;
Selected cell is used for selecting a plurality of judging units by the channel quality average, and sends the handoff request signaling that has business demand information respectively to a plurality of judging units;
Judging unit is used to receive the handoff request signaling, and judges whether to insert service switchover by the signaling that receives; If could would return the sets of sub-channels of sure signaling and business demand to selected cell.
Wherein, selected cell is used for sending the candidate base station subchannel information and professional required number of sub-channels that the handoff request signaling that has business demand information comprises agreement respectively to a plurality of judging units;
Judging unit is used to receive the handoff request signaling, and selects professional required subchannel by the candidate base station subchannel of making an appointment with professional required number of sub-channels; If can select the subchannel information of then returning sure signaling and business demand.
Wherein, selected cell is used for comprising that to the handoff request signaling that has business demand information that a plurality of judging units send respectively QoS requires QoS;
Judging unit is used for candidate base station by estimation to each downlink sub-channels information of this travelling carriage and QoS requirement, judges whether to insert service switchover, if then return sure signaling and to the sets of sub-channels of service switchover distribution to selected cell.
Wherein, selected cell is used for comprising professional required number of sub-channels to the handoff request signaling that has business demand information that a plurality of judging units send respectively;
The receiver module of judging unit is used to receive the handoff request signaling; Release module is used for selecting professional required subchannel at available channel; Judge module is used to judge whether releasing unit filters out professional required number of sub-channels, if then can insert service switchover, and returns sure signaling and professional required subchannel information to selected cell.
The present invention is at first by selecting a plurality of candidate base stations, reduced the target BS that needs Signalling exchange, contrast the channel information of needed all subchannels of the maximized switching mode of user QoS demand of prior art, greatly reduce the load of signaling channel.
Secondly embody the method that reduces the signaling channel load respectively by switching under the switching under the low speed scene, the low speed TDD situation and the switching under the high speed scene;
Under the low speed scene, choose in the subchannel of each base station in a plurality of candidate base stations according to the good and bad ordering of the channel quality a plurality of reservation subchannels chosen and the business demand number of sub-channels that dopes, by in these a plurality of reservation subchannels, choosing the steps such as channel of business demand, reduce the quantity that has reduced target BS, reduced the load of signaling channel;
Candidate base station by precognition under the low speed TDD situation judges that to each downlink sub-channels information of this travelling carriage and travelling carriage quality of service requirement can insert the method for switching travelling carriage all limits the mutual base station of needs, has also reduced the load of signaling channel;
Reduce the mutual channel quantity of needs by the channel quantity that calculates professional switching demand under the high speed scene, reduce the load of signaling channel.
In sum, the present invention can be implemented on the basis of less feedback signaling load, keeps the satisfaction of switching the user as possible.
Description of drawings
Fig. 1 is the schematic network structure of mobile communication system;
Fig. 2 is the air interface physical resource distribution map of ofdma mobile communication system;
Fig. 3 is the flow chart according to first embodiment of the inventive method;
Fig. 4 shows a kind of mode that candidate base station is selected the required subchannel of travelling carriage;
Fig. 5 is according to second embodiment of the inventive method and the flow chart of the 3rd embodiment;
Fig. 6 shows the signaling field of step 302 among Fig. 3.
Embodiment
Here suppose that the switch decision entity is positioned at serving BS, be positioned at the situation of RNC, Access Service Network Gateway or other network entities for the switch decision entity, method of the present invention is suitable equally.
Here suppose that mobile communication system is the ofdma mobile communication system, have the mobile communication system of similar air interface physical resource for SC-FDMA and other, method of the present invention is suitable for too.
If there be N data subchannel in the ofdma mobile communication system, each subchannel is made up of J subcarrier and T time slot.On subchannel, can use AMC (Adaptive Modulation and Coding).System uses certain pilot design mode, makes travelling carriage estimate channel quality on each subchannel according to pilot measurement.Be defined in the delta time section after the switching, new base station provides service with preallocated resource in the handoff procedure for the switching travelling carriage.
This programme is divided into two kinds of situations according to the rate travel of travelling carriage with switch decision, and low speed moves and high-speed mobile.We define low speed and move as follows: when travelling carriage moved at low speed, the correlation time of its multipath fading was greater than the switch decision signaling interaction time.Under the 2GHz carrier wave, when the travelling carriage translational speed is 3km/h, be about 20ms correlation time, the switch decision Signalling exchange needs about 2 Transmission Time Intervals (TTI), 2 processing delay and 2 network transfer delays.If TTI=0.5ms (being the LTE system), processing delay is about 5ms, and network transfer delay can be ignored, and then the switch decision signaling interaction time is about 11ms.Since channel at this moment between in decline change very for a short time, can utilize channel information measurement to improve handover success rate.The definition high-speed mobile is as follows: travelling carriage is when high-speed mobile, and the correlation time of its multipath fading is less than the switch decision signaling interaction time.The channel allocation of channel information this moment after for switch decision do not have value.We provide the mode of Random assignment channel and carry out switch decision.
Fig. 3 is the flow chart according to first embodiment of the inventive method.Resource allocation that is based on channel status and Access Control Policy that this method is used are particularly suitable for low speed and move scene.As shown in Figure 3, whole switching flow is:
Step 301, moving table measuring channel quality, calculate by measured value each base station channel quality average and report; The switch decision entity is selected the candidate base station set according to the size order of the average of channel quality, establishes that the base station number is K in the set.
The process of average that calculates the channel quality of each base station by measured value in this step also can be carried out in the switch decision entity.
Step 302, travelling carriage are selected the N of agreement to each candidate base station to the report of switch decision entity aThe numbering set of individual candidate base station subchannel.Be specially:
(1) travelling carriage (for example, requires minimum combination S to signal interference ratio with the modulating-coding combination S of giving tacit consent in the modulation coding mode set that system can use Min) be about to the transmission means used as switching the back, according to the QoS demand or the service-level agreement (as mean data rate) of mobile station service, calculate at modulating-coding combination S (S for example Min) under, professional needed subchannel number is made as N b
(2) pilot tone of moving table measuring K candidate base station obtains the channel information of all descending subchannels of each candidate base station.For candidate base station k, travelling carriage is chosen N in N subchannel aThe subchannel that individual channel quality is best.Get N a=N b+ λ, λ are redundant subchannel number, and λ can be 0 to N-N bBetween value.As λ=N-N b, i.e. N aDuring=N, the subchannel combinations of selecting has comprised whole subchannels, has increased signaling traffic load greatly; When λ=0, N a=N b, the subchannel combinations of selecting does not provide any redundancy.In general, the value of λ need be compromise between flexibility of expecting to obtain and signaling traffic load.For example, can get λ=2~4, or
Figure A20061012879400111
( g  represents to round downwards).If the set of the numbering of the subchannel of selecting is ∏ k=(π 1..., π Na), π wherein iFor the numbering of subchannel in system, at ∏ kIn press channel quality descending (perhaps ascending order) and arrange, be i.e. π when i>j iChannel quality be better than (or being inferior to) π j
Step 303, switch decision entity send the handoff request signaling to K candidate base station, comprise corresponding separately ∏ in the signaling k
Step 304, candidate base station judge whether to insert the switching travelling carriage, if can insert then return affirmative acknowledgement and preallocated sets of sub-channels ∏ ' k, then return the negative answer signaling if can not insert.Be specially:
Candidate base station k is known ∏ from the handoff request information of switch decision entity kAccording to the dispatching algorithm of this base station and the operating position of subchannel, candidate base station k is at ∏ kInterior N aSelect N in the individual subchannel bIndividual is new travelling carriage service.λ redundant subchannel provides flexibility for the access control of candidate base station.New set of sub-channels is combined into ∏ ' k=(π ' 1..., π ' Nb).
At N aSelect N in the individual subchannel bThe mode of individual subchannel is relevant with the dispatching algorithm that adopt the base station.Referring to Fig. 4, if at ∏ kSub-channels is pressed the channel quality descending, selects flow process to be:
1) judges ∏ kIn occupied number of subchannels whether greater than λ, if execution in step 2 then), execution in step 8 then if not);
2) judge whether π iOccupied, be execution in step 3 then), execution in step 6 then if not);
3) with the π that takies iThe user be dispatched to ∏ kOn the subchannel in addition;
4) judging whether success, is execution in step 6 then), otherwise execution in step 2), next π continued iJudgement;
5) with π iDistribute to new user;
6) judge whether the subchannel that new user assigns to reaches N b, be then to return success signaling, otherwise execution in step 7);
7) judge ∏ kWhether the sub-channels distribution finishes, and is then to return failed signaling, otherwise execution in step 2), continue next π iJudgement;
8) judge whether π iOccupied, be then to continue to judge next π i, otherwise execution in step 9);
9) with π iDistribute to new user;
10) judge whether the subchannel that new user assigns to reaches N bIf then return success signaling, if not execution in step 8 then) then continue to judge next π i
Here provide a comparatively concrete example: if at ∏ kSub-channels is pressed the channel quality descending, and establishes λ=3, ∏ kIn occupied number of subchannels=2, if ∏ then kThe middle number of subchannels that is taken by existing travelling carriage is less than λ, then from π 1Rise for the travelling carriage allocated sub-channels, if subchannel π is arranged therebetween iTaken by the original travelling carriage in base station, then skip π iContinue to select, up to selecting N bIndividual subchannel.If ∏ kIn the number of subchannels that taken by original travelling carriage greater than λ, then from π 1Beginning will take π iOriginal travelling carriage be dispatched to and do not belong to ∏ kSuitable subchannel on (need to guarantee the QoS of this travelling carriage, schedule it to as far as possible) with on other time slots frequently, the π that discharges iDistribute to new travelling carriage.The flow process of selection mode as shown in Figure 4.If at ∏ kSub-channels is pressed the channel quality ascending order and is arranged, then can be from π NaRise, carry out process similar to the above.
Step 305, switch decision entity in returning the candidate base station of affirmative acknowledgement, select the pilot channel quality large scale average maximum as target BS, send to this base station and to switch indication.
Step 306, switch decision entity indication travelling carriage and target BS obtain physical layer operations such as synchronous, the ∏ ' that is distributing kOn, accept the data of target BS by the modulation coding mode S of agreement.
All the other processes are switched in step 307, execution.
Realize said method, need in the decision system of the mobile communication business of correspondence, carry out.This system comprises: measuring unit, computing unit, selected cell, judging unit.
Measuring unit is measured the channel quality of travelling carriage and each subchannel of its relevant base station, and measurement data is sent to computing unit;
Computing unit calculates the average of channel quality by channel quality data, and this value is reported to selected cell;
The size of the average of selected cell by channel quality, a selective sequential K judging unit, and send the handoff request signaling that has business demand information respectively to K judging unit; This signaling comprises the candidate base station subchannel information and professional required number of sub-channels of agreement;
Identical in the method for the method of choosing the candidate base station subchannel of making an appointment and the quantity of choosing professional required subchannel and the said method do not repeat them here.
Judging unit is used to receive the handoff request signaling, and selects professional required subchannel by the candidate base station subchannel of making an appointment with professional required number of sub-channels; If can select and then return sure signaling and professional required subchannel information.
Above-mentioned measuring unit, computing unit, selected cell are positioned at travelling carriage, and judging unit is positioned at the base station; But also be not limited to listed corresponding relation during practical application, can adjust according to actual conditions.
Identical in the method for selecting professional required subchannel and the said method do not repeat them here.
Fig. 5 is the flow chart according to second embodiment of the inventive method.In this embodiment, the duplex mode of system is the TDD mode.By appropriate pilot design, can make candidate base station measure the ascending pilot frequency of travelling carriage, thereby obtain up each subchannel information of this travelling carriage by channel estimating, according to the reciprocity of TDD system up-downgoing channel, estimate descending each subchannel information.Utilize this characteristics, can simplify the handover scheme of Fig. 3 as follows:
Step 501, moving table measuring channel quality, calculate by measured value each base station channel quality average and report; The switch decision entity is selected the candidate base station set according to the size order of the average of channel quality, establishes that the base station number is K in the set.
Step 502, switch decision entity send the handoff request signaling to K candidate base station, comprise the travelling carriage quality of service requirement in the signaling.The pilot tone feature of might the needs report switching travelling carriage according to the characteristics of pilot design.
Step 503, candidate base station k measure the ascending pilot channel of travelling carriage, obtain up each subchannel information, according to TDD system up-downgoing channel reciprocity, obtain this base station to switching descending each subchannel information of travelling carriage.Candidate base station is according to channel information, and the quality of service requirement of travelling carriage, implements conventional access control, judges whether to insert the switching travelling carriage, if can insert then return the sets of sub-channels Ω of affirmative acknowledgement and distribution kWith corresponding modulating-coding combination S TDD, then return the negative answer signaling if can not insert.
Step 504, switch decision entity in returning the candidate base station of affirmative acknowledgement, select the pilot channel quality large scale average maximum as target BS, send to this target BS and to switch indication.
Step 505, switch decision entity indication travelling carriage and target BS obtain physical layer operations such as synchronous, the Ω that is distributing kOn, with the modulating-coding combination S of target BS appointment TDDAccept the data of target BS.
All the other processes are switched in step 506, execution.
Realize said method, need in the decision system of the mobile communication business of correspondence, carry out.This system comprises: measuring unit, computing unit, selected cell, judging unit.
Measuring unit is measured the channel quality of travelling carriage and each subchannel of its relevant base station, and measurement data is sent to computing unit;
Computing unit calculates the average of channel quality by channel quality data, and this value is reported to selected cell;
The average of selected cell selects module to be used for selecting K judging unit by the average of channel quality; The quality requirement acquisition module is used for obtaining quality of service requirement by the characteristics of pilot design, and sends the handoff request signaling that has business demand information respectively to K judging unit, and this handoff request signaling comprises the QoS requirement;
Judging unit receives the handoff request signaling, and the candidate base station that passes through estimation judges whether to insert service switchover to each downlink sub-channels information of this travelling carriage and QoS requirement; If could would return sure signaling and to the required subchannel information of business to selected cell; If it is not all right then return negative signaling to selected cell.
The average of above-mentioned measuring unit, computing unit, selected cell selects module to be positioned at travelling carriage, and the quality requirement acquisition module of selected cell is positioned at the switch decision entity, and judging unit is positioned at the base station; But also be not limited to listed corresponding relation during practical application, can adjust according to actual conditions.
Obtain candidate base station identical in the method for each downlink sub-channels information of this travelling carriage and the above-mentioned corresponding method, be not repeated at this.
Under the high-speed mobile scene, channel conditions alters a great deal in the switch decision signaling interaction time, and the channel allocation of the channel information before the switch decision after for switch decision do not have value, therefore is fit to adopt the mode of Random assignment channel to carry out resource reservation.Whole handoff procedure is described below, and flow chart is identical with Fig. 5.
Step 601, moving table measuring channel quality, calculate by measured value each base station channel quality average and report; The switch decision entity is selected the candidate base station set according to the size order of the average of channel quality, establishes that the base station number is K in the set.
Step 602, switch decision entity send the handoff request signaling to K candidate base station.Signaling comprises request subchannel number N bN bObtain by following method:
(1) the modulating-coding combination S of switch decision entity selection acquiescence (for example in system can gather with modulation coding mode, requires minimum combination S to signal interference ratio Min) as transmission means.
(2) the switch decision entity calculates under the modulating-coding combination S according to the QoS demand (as mean data rate) of mobile station service, and the subchannel number that needs is made as N b
Step 603, each candidate base station judge whether to insert the switching travelling carriage, return the answer signaling of positive or negative, and the channel set ∏ that distributes.Concrete determining step is as follows:
(1) at first candidate base station judges that whether available subchannels quantity is greater than N bValue, if greater than, picked at random N in available subchannels then bIndividual subchannel is designated as ∏ with this set.Being chosen on the frequency domain of subchannel scatter as far as possible, even the interval of subchannel is big as far as possible.
(2) as the not enough N of the available subchannels of candidate base station bThe time, seize the channel of original travelling carriage, but the decreased performance of bringing thus can not surpass the service quality agreement, can at first seize non real-time original travelling carriage channel.
(3) if the not enough N of the available subchannels of candidate base station bAnd can not discharge enough subchannels by the channel of seizing original travelling carriage and give when switching travelling carriage, then return negative replying.
Step 604, switch decision entity in returning the base station of affirmative acknowledgement, select the pilot channel quality large scale average maximum as target BS, send indication to this base station.
Step 605, switch decision entity indication travelling carriage and target BS are obtained physical layer operations such as synchronous, on the ∏ that distributes, accept the data of target BS with the modulation coding mode S of agreement.
All the other processes are switched in step 606, execution.
Realize said method, need in the decision system of the mobile communication business of correspondence, carry out.This system comprises: measuring unit, computing unit, selected cell, judging unit.
Measuring unit is measured the channel quality of travelling carriage and each subchannel of its relevant base station, and measurement data is sent to computing unit;
Computing unit calculates the average of channel quality by channel quality data, and this value is reported to selected cell; The average of selected cell selects module to be used for selecting K judging unit by the average of channel quality; Subchannel selects module to be used to obtain professional required number of sub-channels; And send the handoff request signaling that has business demand information respectively to K judging unit; This demand signalling comprises professional required number of sub-channels;
The receiver module of judging unit is used to receive the handoff request signaling; Release module is used for selecting to the required subchannel of business at available channel; Judge module is used to judge whether releasing unit filters out professional required number of sub-channels, if then can insert service switchover, and returns sure signaling and professional required subchannel information to selected cell.
The average of above-mentioned measuring unit, computing unit, selected cell selects module to be positioned at travelling carriage, and the subchannel of selected cell position selects module to be positioned at the switch decision entity, and judging unit is positioned at the base station; But also be not limited to listed corresponding relation during practical application, can adjust according to actual conditions.
Identical in the method for obtaining professional required number of sub-channels and the above-mentioned corresponding method is not repeated at this.
Target of the present invention is under the situation that reduces signaling traffic load as far as possible, improves the performance of switching travelling carriage.Compare from several aspects with three embodiment of the present invention and the maximized switching mode of user QoS below.
The subchannel sum N that sets up departments in the system is no more than 32, and then subchannel is numbered available 5 bits and represented.In the step 302 of first embodiment, the up signaling that travelling carriage sends to the switch decision entity comprises field as shown in Figure 6, and length is 5 * K * (2+N a) bit.Tdd mode and high-speed mobile scene handoff procedure do not need this step.For the maximized switching mode of user QoS, the signaling that needs travelling carriage to feed back to the switch decision entity comprises the channel information of all subchannels.If the channel information of a subchannel is represented with 5 bits, then need 5 * K * N bit signalling load.Suppose N=32, N a=3, then in first embodiment, signaling traffic load is reduced to about 16% of QoS maximization mode.
The step 303 of first embodiment, the switching controls entity sends the handoff request signaling to candidate base station.If in the handoff request signaling relevant field, represent the handoff request sign with 2 bits.Also need 5 * (2+N in addition a) selection of bit indexed resource.The step 502 of a tdd mode handoff procedure need send the handoff request sign and user's qos requirement gets final product.Here suppose to represent with 16bit user's QoS demand, because diversity of operations, this field may need more bits.The step 602 of high-speed mobile scene handover scheme needs to send handoff request sign and N bValue (is established with 5 bits and is represented N b).For the maximized switching mode of user QoS, the channel information of travelling carriage report need be handed to the corresponding candidate base station, need 5 * N bit signalling load.The step 306 of first embodiment, the switch decision entity need be announced the resource allocation result of target BS to travelling carriage, and travelling carriage is communicated by letter with target BS foundation on this resource.This downlink signaling should comprise 5 * (2+N b) field list of bit illustrates the subchannel of distribution.In low speed tdd mode and the maximized switching mode of user QoS, target BS is known the sufficient channel information of switching travelling carriage, and the subchannel number of distributing for travelling carriage is N c, because target BS can distribute higher modulation coding mode to some subchannel, the subchannel number that travelling carriage is needed reduces, so generally have: N c≤ N bTdd mode and user QoS maximization mode also need provide the modulating-coding combination (need supposing 4bit) on each subchannel except that the need indexed resource distributes.And low speed moves that scene is switched and the high-speed mobile scene to switch what adopt be the modulation coding mode of acquiescence, so only need the indexed resource distribution condition, not it may be noted that modulation coding mode.
Switching mode Upstream control signaling relevant field load (bit) Handoff request signaling relevant field load (bit) Resource allocation indication field load (bit)
Low speed moves the embodiment under the scene 5×K×(2+N a) 2+5×(2+N a) 5×(2+N b)
Low speed moves the embodiment of the TDD system under the scene 0 2+16 5×(2+N c) +4×N c
Embodiment under the high-speed mobile scene 0 2+5 5×(2+N b)
The maximized switching mode of user QoS 5×K×N 2+5×N+16 5×(2+N c) +4×N c
The contrast table of table 1 signaling traffic load
As can be seen from Table 1, the analysis result of signaling traffic load is, for the maximized switching mode of user QoS, three part signaling traffic loads all reduce respectively, and that remaining signaling is several switching modes is total, and therefore total signaling traffic load reduces.
More than to method and the network management system of obtaining the network information provided by the present invention, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (15)

1. a mobile communication service switching decision method is characterized in that, this method comprises:
The moving table measuring quality of channel;
The switch decision entity obtains the average of described channel quality, and selects a plurality of base stations as candidate base station according to the descending order of average, and sends the handoff request signaling that comprises the mobile station service demand information respectively to a plurality of candidate base stations;
Can candidate base station is judged by the mobile station service demand information that receives insert the switching travelling carriage, if could would return sure signaling and professional required subchannel information;
The switch decision entity in returning the candidate base station of sure signaling, selective channel quality average maximum as target BS, send to this base station and to switch indication.
2. mobile communication service switching decision method according to claim 1 is characterized in that, described mobile station service demand information comprises the candidate base station subchannel information and professional required number of sub-channels of agreement;
Can candidate base station is judged in the candidate base station subchannel of making an appointment select professional required number of sub-channels, if can then insert the switching travelling carriage; And choose the reservation subchannel of professional requirement, return to the switch decision entity.
3. mobile communication service switching decision method according to claim 2, it is characterized in that, the Forecasting Methodology of the number of sub-channels that described business is required is: the transmission means that travelling carriage uses as the switching back by a kind of modulating-coding combination of system default, according to the operation quality requirement of travelling carriage or the agreement of the grade of service, calculate professional needed number of sub-channels.
4. mobile communication service switching decision method according to claim 2 is characterized in that, the method for agreement candidate sub-channel information is:
In each candidate base station, according to the channel quality quality, order selects the subchannel of some; And described number of sub-channels is greater than the required number of sub-channels of business.
5. mobile communication service switching decision method according to claim 2 is characterized in that, the method for choosing the reservation subchannel of professional requirement is: the subchannel ordering of giving the reservation of selecting according to the quality of channel quality; If unappropriated channel quantity is not less than professional required channel quantity in the subchannel of reservation, then according to the channel quality quality, the reservation subchannel of selective sequential free time; If the unappropriated number of channel is less than the required channel quantity of business, then according to the quality of channel quality, order is chosen professional required channel quantity, and the user of busy channel is dispatched on other subchannels of the subchannel that does not belong to reservation.
6. mobile communication service switching decision method according to claim 1 is characterized in that, described mobile station service demand information comprises travelling carriage quality of service requirement QoS;
Each candidate base station obtains each downlink sub-channels information of this travelling carriage; According to described downlink sub-channels information and travelling carriage quality of service requirement, can judgement insert the switching travelling carriage.
7. mobile communication service switching decision method according to claim 6, it is characterized in that, the method that described candidate base station obtains each downlink sub-channels information of this travelling carriage is: candidate base station is measured the ascending pilot channel of travelling carriage, obtain up each subchannel information, by the reciprocity of system's up-downgoing channel, obtain this base station to switching descending each subchannel information of travelling carriage.
8. mobile communication service switching decision method according to claim 1 is characterized in that,
Described mobile station service demand information comprises professional required number of sub-channels;
Candidate base station judges that then picked at random went out the subchannel of this quantity, and the subchannel information of selecting is returned to the switch decision entity when its idle sub-channels was not less than professional required number of sub-channels.
9. mobile communication service switching decision method according to claim 8 is characterized in that,
When candidate base station is judged its idle sub-channels less than the required number of sub-channels of business, then discharge the channel that has taken, if the channel that discharges reaches professional required number of sub-channels with the channel quantity of free time, the subchannel information of selecting is returned to the switch decision entity.
10. 9 arbitrary described mobile communication service switching decision methods according to Claim 8,, it is characterized in that, the method that obtains the required number of sub-channels of business is: behind a plurality of candidate base stations of switch decision entity selection, by the travelling carriage QoS requirement of precognition, calculate the professional required number of sub-channels that under the modulating-coding combination of system default, needs.
11. according to the arbitrary described mobile communication service switching decision method of claim 1 to 9, it is characterized in that, after the switching indication is sent in this base station, further comprise:
Switch decision entity indication travelling carriage carries out synchronously with target BS, on the travelling carriage subchannel that distributes, accepts the data of target BS by the modulation coding mode that presets, and with target BS execution switching.
12. a mobile communication system is characterized in that, this system comprises: measuring unit, computing unit, selected cell, judging unit;
Measuring unit is used to measure the channel quality of travelling carriage, and measurement data is sent to computing unit;
Computing unit is used for calculating the channel quality average and average being reported to selected cell by measurement data;
Selected cell is used for selecting a plurality of judging units by the channel quality average, and sends the handoff request signaling that has business demand information respectively to a plurality of judging units;
Judging unit is used to receive the handoff request signaling, and judges whether to insert service switchover by the signaling that receives; If could would return the sets of sub-channels of sure signaling and business demand to selected cell.
13. mobile communication system according to claim 12 is characterized in that,
Selected cell is used for sending the candidate base station subchannel information and professional required number of sub-channels that the handoff request signaling that has business demand information comprises agreement respectively to a plurality of judging units;
Judging unit is used to receive the handoff request signaling, and selects professional required subchannel by the candidate base station subchannel of making an appointment with professional required number of sub-channels; If can select the subchannel information of then returning sure signaling and business demand.
14. mobile communication system according to claim 12 is characterized in that, selected cell is used for comprising that to the handoff request signaling that has business demand information that a plurality of judging units send respectively QoS requires QoS;
Judging unit is used for candidate base station by estimation to each downlink sub-channels information of this travelling carriage and QoS requirement, judges whether to insert service switchover, if then return sure signaling and to the sets of sub-channels of service switchover distribution to selected cell.
15. mobile communication system according to claim 12 is characterized in that, selected cell is used for comprising professional required number of sub-channels to the handoff request signaling that has business demand information that a plurality of judging units send respectively;
The receiver module of judging unit is used to receive the handoff request signaling; Release module is used for selecting professional required subchannel at available channel; Judge module is used to judge whether releasing unit filters out professional required number of sub-channels, if then can insert service switchover, and returns sure signaling and professional required subchannel information to selected cell.
CN2006101287945A 2006-09-08 2006-09-08 Switch judging method of mobile communication service and mobile communication system Expired - Fee Related CN101141793B (en)

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