CN101459877B - Region selection method for single frequency network - Google Patents
Region selection method for single frequency network Download PDFInfo
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- CN101459877B CN101459877B CN2008102411741A CN200810241174A CN101459877B CN 101459877 B CN101459877 B CN 101459877B CN 2008102411741 A CN2008102411741 A CN 2008102411741A CN 200810241174 A CN200810241174 A CN 200810241174A CN 101459877 B CN101459877 B CN 101459877B
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Abstract
The invention provides a method for selecting the area of a single-frequency network, which comprises the following steps: calculating and feeding back the number of a UE of the received business to an MCE through according to the feedback proportion by the MCE and the feedback proportion by an eNB, dividing the total number of UE of receiving the business in the feed back by the eNB number by the MCE, obtaining the average user number of a community, confirming the average user number of the community is less than the threshold value limited by the spectrum efficiency according to different transmission mode by the MCE, searching the number of the UE of the received business in the single-frequency network area is lower than the eNB of the average user number in the community by the MCE, after confirming the feedback rate is equal to number one, deciding the adjustment mode of the single-frequency network area according to the position of the eNB, and notifying the eNB which needs adjusting. Through applying the invention, the timing calculation of the UE number of the received certain business does not need to be carried out to all the eNB, which saves the resources of an upgoing communication channel, reduces the number of UE which needs entering an active state and reduces the energy consumption of the UE.
Description
Technical field
The present invention relates to wireless communication technology field, more specifically, the present invention relates to a kind of regional selection method of single frequency network.
Background technology
In cell mobile communication systems, provide BroadCast MultiCast Service to become an important trend of radio communication development.For example, MBS among the broadband wireless MAN agreement IEEE802.16 (multicast and broadcast service), the MBMS among the 3GPP Release 6 (multimedia broadcast multicast service) are exactly the mechanism of the support broadcast multi-broadcasting service of special definition in the wideband wireless mobile communication standard of these main flows.In these present mechanism, mainly take a little to arrive single cell transmission mode of multiple spot (PTM), by identical Radio Resource is that a plurality of users are transmitted identical business, rather than is that the independent Resources allocation of each user is carried out professional transmission, thereby can effectively utilize Radio Resource.But in the mode of PTM, spectrum efficiency is determined that by the poorest user of channel quality for example the user of cell edge has limited the further raising of spectrum efficiency.
At this problem, the Long Term Evolution plan of 3GPP (Long Term Evolution, LTE) the MBMS mechanism that strengthens has been proposed in the project, it is the multimedia broadcast multicast service (E-MBMS) of enhancement mode, it not only supports single sub-district PTM mode, also support a kind of new BroadCast MultiCast Service transmission means: single frequency network (Single Frequency Network, SFN) mode.So-called single frequency network mode, promptly one group of physically adjacent sub-district uses identical wireless running time-frequency resource, identical modulation coding mode to carry same broadcast multi-broadcasting service.The advantage of this mode is: a user who is in the single-frequency network area can find that it is better that the signal of this service becomes when receiving the broadcast multi-broadcasting service; Simultaneously, moving between the different districts of terminal in same SFN zone not to have performance loss, and as a huge sub-district, the signal in whole big zone is all fine and do not worry too far away from the base station in the terminal that receives the broadcast multi-broadcasting service in whole SFN zone.
For supporting the SFN mode, LTE has added many sub-districts coordination entity (MCE) in its cellular logic framework, to carry out the management of SFN.After adding MCE, the logical architecture of MBMS as shown in Figure 1 among the LTE.Each entity is respectively: BM-SC (BroadCast MultiCast Service center), the dispatching centre of broadcast multi-broadcasting data; E-MBMSGW (the multimedia broadcast multicast gateway of enhancement mode) is distributed to eNB with the broadcast multi-broadcasting data from BM-SC; MCE, under the SFN transmission mode, the eNB in the unified management SFN zone is used to transmit the Radio Resource of specific broadcast multi-broadcasting service; ENB (base station) is responsible for all communications of Mobile Terminals in the sub-district; UE (portable terminal).
Carry out the single frequency network transmission, need the selection that certain mechanism is carried out single-frequency network area, determine to select which neighbor cell to form SFN zone, synchronous transmission MBMS data; After the SFN zone forms,, cutting, expansion or fractionation are carried out in existing SFN zone along with the variation of service reception condition and Radio Resource operating position in this zone.At present, mainly comprise following two classes in existing solution aspect the SFN zone selection:
1), by (the O﹠amp of operation maintenance center; M) carry out the selection in SFN zone for the MBMS business, no matter the professional what state of accepting changes, and the SFN zone remains unchanged.For example, O﹠amp; M is A1 for professional 1 zone of determining, for professional 2 zones of determining are A2.In business 1 and professional 2 transmission courses, no matter the interior business in zone is accepted what state changes, and regional A1 and A2 remain unchanged.This method is simple, but can cause the reduction of wireless resource utility efficiency.If in a period of time, the UE that has only the minority sub-district among the A1 receive professional 1, but since A1 can not adjust, so among the A1 all sub-districts all in transport service 1, thereby cause the waste of resource.
2), in order to reach higher resource utilization and flexibility, the dynamic selection method in proposition SFN zone.This method is carried out the selection in SFN zone according to the distribution that receives certain professional UE, and along with the moving of UE, dynamically carries out cutting, fractionation and the merging in SFN zone.For example, continuous when mobile as UE, UE may slowly be distributed in two non-conterminous zones in current SFN zone, and at this moment, this method will be carried out the fractionation in SFN zone, the merging in SFN zone in contrast; If a border cell in the SFN zone does not have UE to receive this business, then this sub-district is removed from the SFN zone, thereby dwindled the SFN zone.This method need be understood the UE distribution situation in each sub-district that the SFN zone comprised, and feedback quantity is very big, and managerial high complexity will be brought if change too soon in the SFN zone.And in this dynamic approach, moving of UE is very big to the regioselective influence of SFN.In fact, receive the distribution of certain professional UE in a zone, will be stable at certain level at least within a certain period of time.If do not carry out the adjustment in SFN zone owing to certain sub-district temporarily receives certain professional UE, and this sub-district may just have this professional UE of reception to enter at once, and this will bring unnecessary spending.
Summary of the invention
For overcome existing single-frequency network area select in very flexible or feedback information is big and complexity is high defective, the present invention proposes a kind of regional selection method of single frequency network.
According to an aspect of the present invention, proposed a kind of regional selection method of single frequency network, having comprised:
The feedback proportional that step 10), eNB are determined according to MCE is to receiving certain professional UE number and add up and feeding back to MCE;
Step 20), this professional UE sum of reception in MCE all feedbacks that will receive is divided by the corresponding eNB number of feedback, obtains the sub-district average user number;
Step 30), MCE determines the threshold values that the sub-district average user number limits less than the spectrum efficiency according to different transmission meanss;
Step 40), MCE searches and receives the eNB number of this professional UE number less than the sub-district average user number in the single-frequency network area, determine that feedback proportional equals 1 after, determine the adjustment mode of single-frequency network area to send the eNB of message according to the position of eNB to the needs adjustment.
Wherein, step 10) also comprises: MCE adds up in this sub-district according to its all eNB that control and receives this professional UE number, select to comprise the sub-district number at most and the zone of the threshold values that limits greater than spectrum efficiency of sub-district average user number according to different transmission meanss as the prime area of single frequency network.
Wherein, step 10) also comprises: MCE sends to all eNB in the single-frequency network area with feedback proportional, the random number that eNB determine to produce less than feedback proportional after, add up and feed back to MCE receiving this professional UE number in this sub-district, the statistics message of the described MCE of feeding back to comprises type of message indication, eNB sign, MBMS traffic flag, UE number.
Wherein, step 10) also comprises: it is the eNB of feedback proportional that MCE selects the ratio that accounts for eNB sum in the single-frequency network area at random, send the feedback request message, described eNB receives after this message and to add up and feed back to MCE receiving this professional UE number in this sub-district that described feedback request message mainly comprises type of message indication, single frequency network sign, MBMS traffic flag.
Wherein, in the step 10), MCE determines feedback proportional according to feedback number of base stations and load capacity, and the initial value of feedback proportional can be got greater than 0 less than any number of 1, also can determine according to the feedback proportional that used last time.
Wherein, in the step 10), the time of the last statistics of eNB record oneself UE number, if eNB receives time difference of time and the last statistics UE number of request that MCE requires its feedback UE number less than certain threshold values, eNB feeds back to MCE with the UE number of the last time statistics.
Wherein, step 20) also comprises:, collect among all or part eNB adjacent and receive this professional UE number with this single frequency network if average user number greater than certain threshold values, can enlarge single-frequency network area, average user number in the calculation plot is determined these sub-districts are merged in the single frequency network.
Wherein, step 30) also comprise: if feedback proportional less than 1, increases feedback proportional, if feedback proportional greater than 1, is made as 1 with feedback proportional; Return step 10) and add up UE again; Described threshold values is the critical value of average user number in the sub-district under the described transmission means, gets 2 or 3 usually.
Wherein, step 40) in, the message of described transmission comprises type of message indication, single frequency network sign, adjusts action; Wherein, adjust action comprise withdraw from, adding and single frequency network sign change.
Wherein, step 10) also comprises: MCE indicates the eNB that this had fed back, never picked at random goes out N1 eNB and feeds back among the eNB that feeds back, and wherein, the sub-district number in the SFN zone multiply by the eNB number N that feedback proportional deducts statistics last time again and obtains N1.
By application the present invention, make that not needing all eNB regularly to add up it receives certain professional UE quantity, thereby saved uplink channel resources, reduced the UE quantity that need enter active state, reduced the UE energy consumption; And carry out determining of single-frequency network area according to the sub-district average user number, compare with dynamic approach, feedback quantity and complexity have all had very big reduction, and be practical more in real system; By reasonably selecting threshold values, the present invention can guarantee that the single-frequency network area wireless resource utility efficiency reaches the index of system requirements.
Description of drawings
Fig. 1 is for supporting the schematic diagram of the cellular radio Communication system that single frequency network is transmitted;
Fig. 2 is that the MCE of the embodiment of the invention carries out the flow chart that single-frequency network area upgrades;
Fig. 3 is that the MCE of first embodiment of the invention adds up the flow chart that receives certain professional sub-district average user number in the single-frequency network area;
The sight schematic diagram of Fig. 4 for shrinking single-frequency network area;
The sight schematic diagram of Fig. 5 for splitting single-frequency network area;
Fig. 6 is that the MCE of second embodiment of the invention adds up the flow chart that receives certain professional sub-district average user number in the single-frequency network area.
Embodiment
Be described in detail below in conjunction with the regional selection method of the drawings and specific embodiments a kind of single frequency network provided by the invention.
The MCE that Fig. 2 illustrates according to the first embodiment of the present invention carries out the flow chart that single-frequency network area upgrades.When certain service needed transmission, E-MBMS GW will notify MCE, and MCE at first determines initial single-frequency network area.
In the existing method, initial single-frequency network area can be by O﹠amp; M disposes in advance, O﹠amp; The result notification MCE that M will dispose in advance, MCE preserves the corresponding relation of traffic flag and single-frequency network area.When business began to transmit, MCE only need just can find O﹠amp according to traffic flag; M is the single-frequency network area of this business configuration.
In another embodiment of the present invention, determine that the method for initial single-frequency network area comprises: MCE sends feedback request message all eNB to its control, requires eNB to feed back UE number in its sub-district.ENB will add up and receive this professional UE number in this sub-district and send to MCE.MCE selects to comprise a maximum zone of sub-district number, and in should the zone sub-district average user number greater than first threshold values (physical significance of threshold value is to adopt the minimum value of average user number in the sub-district that the SFN mode transmits), with the prime area of this zone as single frequency network.
As shown in Figure 2, in professional transmission course, MCE is updated periodically single-frequency network area.Update cycle can be pre-configured system parameters, for example 1 minute, 10 minutes etc.
MCE determines the initial value of feedback proportional p, and wherein, the initial value of p can be got greater than 0 less than any number of 1.The p value of using when the initial value of p also can upgrade according to last time is determined, for example equals 2/3 of value last time; Also can directly Use Defaults for example 0.5.Feedback proportional has determined to add up and to send result's number of base stations, and feedback proportional is high more, needs the base station of feedback many more, and system load is big more.Feedback proportional equals at 1 o'clock, and all base stations all need statistics and send the result.
MCE uses feedback proportional p to add up sub-district average user number in the present single-frequency network area.The MCE that Fig. 3 illustrates present embodiment adds up the flow process that receives and add up certain professional sub-district average user number in the single-frequency network area, as shown in Figure 3, comprising:
MCE sends to eNB all in this single-frequency network area by the feedback request message with feedback proportional p.The field that the feedback request message mainly comprises is type of message indication, single frequency network sign, p value, can also comprise the MBMS traffic flag.
After eNB receives this message, the random number between generating 0～1, if this random number is less than p, eNB will add up receiving this professional UE number in this sub-district, and the number of statistics is sent to MCE; If this random number is not less than p, do not carry out any operation.
Wherein, the UE that eNB need add up comprises that all receive the UE of this MBMS business, and no matter it is in idle condition or active state.Statistical method can adopt present existent method, for example the numeration method that defines among the 3GPP TS25.346.If eNB initiates once statistics, need the time of this statistics of record.If eNB receives time difference of time and the last statistics UE number of the feedback request message of MCE be not more than second threshold values (its physical meaning is the time interval, be the time that eNB receives the feedback request message to be not more than this value, then do not need to add up again certain professional UE number of reception with the time interval that last statistics receives certain professional UE number.Second threshold values can be a second level, classification, and the update cycle that is not more than MCE gets final product.Second threshold values is more little, and statistics is accurate approximately, but overhead is big more, therefore can determine according to the different performance requirement of system.), eNB will not initiate statistics, but the UE number of the last time statistics is fed back to MCE.Second threshold values can be got the cycle that MCE upgrades single-frequency network area.
It is type of message indication, the sign of eNB, MBMS traffic flag, UE number that the UE number of statistics is sent to the field that the message of MCE mainly comprises.
The professional UE sum of reception in all feedbacks that MCE will receive obtains the sub-district average user number in this single-frequency network area divided by the eNB number of feedback.
Return Fig. 2, MCE uses feedback proportional p to add up in the present single-frequency network area after the average user number of sub-district, if the sub-district average user number greater than first threshold values, then keeps single-frequency network area constant, this upgrades end; If this average user number is less than first threshold values, and p equals 1, carries out following step 100, otherwise carries out following step 200.
Wherein, the system of selection of first threshold values is: to the MBMS business is to adopt the SFN mode to transmit or transmit with the mode of single sub-district PTM, and main judgment criterion is exactly a spectrum efficiency.Emulation provides the spectrum efficiency comparison of different transmission meanss among the 3GPP.Simulation result shows, if single sub-district PTM mode is supported the adaptation rate adjustment, then has only when receiving certain professional average user number less than 2-3 in the sub-district, and the spectrum efficiency of PTM mode just is higher than the SFN mode, is SFN mode spectrum efficiency height under other situations.If the PTM mode do not support the adaptation rate adjustment, then it will use the modulation coding mode of poor efficiency, and spectrum efficiency also will be lower than the SFN mode all the time.Therefore, can determine first threshold values, i.e. the critical value of average user number in the sub-district, for example 2 or 3 based on simulation result.
In addition, in the foregoing description, if the sub-district average user number will keep single-frequency network area constant greater than first threshold values, this strategy also can be made amendment.Optionally strategy comprises: MCE sends the feedback request message to all or part eNB adjacent with this single frequency network, and eNB will add up receiving this professional UE number in this sub-district after receiving this message, and the number of statistics is sent to MCE.MCE calculates the sub-district average user number in the single frequency network adjacent area, if average user number greater than first threshold values, then merges to these neighbor cells in the single frequency network, enlarges the zone of single frequency network, otherwise keeps single-frequency network area constant.
Step 100: check receive among all eNB in this single-frequency network area this business the UE number, find the eNB that is lower than average user number in the sub-district, decide the adjustment mode of single-frequency network area according to the position of eNB, for example split, shrink, cancellation etc.If need to adjust, then carry out following step 300; Do not need adjustment then to keep single-frequency network area constant, this upgrades end.
Respectively the situation of shrinking, splitting and cancel is described below.Fig. 4 and Fig. 5 are respectively the schematic diagrames that need shrink and split situation.Hexagon among the figure is represented the sub-district, and little square expression receives the UE of this MBMS business, and except that the sub-district of white, other sub-districts all belong to former single-frequency network area.In Fig. 4, through the more new discovery of MCE, do not had UE in the sub-district of gridding in this business of reception, and these sub-districts are in the edge of single-frequency network area to the sub-district average user number, therefore can directly single-frequency network area be shunk, promptly notify the grid sub-district to withdraw from single-frequency network area.In Fig. 5, receive this professional UE and concentrate the both sides that have been distributed in former single-frequency network area, some middle sub-districts have not had UE in this business of reception, the i.e. sub-district of gridding.Can notify this moment the grid sub-district to release single-frequency network area, former single-frequency network area has split into two, and one of them need use new single frequency network sign.In addition, if receive this professional UE number all less than first threshold values in the most of sub-district of former single-frequency network area, then can cancel this single frequency network.
Step 200: p multiply by M with feedback proportional, and the value of M can equal first threshold values divided by average user number in the current area.Afterwards,, p is made as 1, returns to restart to add up and receive certain professional sub-district average user number in the single-frequency network area and adjust if p is greater than 1.
Step 300: the eNB that notice needs adjustment for example notifies it to add this single-frequency network area, or withdraw from this single-frequency network area, or the single frequency network sign changes.
The field that notification message mainly comprises is type of message indication, single frequency network sign, adjusts and move.Wherein, adjust action comprise withdraw from, adding and single frequency network sign change.If adjust action for adding, also will comprise the MBMS traffic flag in the notification message and be the Radio Resource of this traffic assignments; If adjust action for the single frequency network sign changes, need to comprise new single frequency network sign in the notification message.
The MCE that Fig. 6 illustrates according to second embodiment of the invention adds up the flow process that receives and add up certain professional sub-district average user number in the single-frequency network area.The difference of second embodiment and first embodiment is need how to select the eNB aspect of feedback UE quantity.First embodiment be eNB receive feedback please message after, determine whether feeding back according to p value; And second embodiment is the eNB that need to determine feedback on MCE, directly notifies these eNB to feed back.
As shown in Figure 6, MCE uses feedback proportional p to add up sub-district average user number in the present single-frequency network area, and statistic procedure comprises:
MCE calculates the N value, and the sub-district number that the N value equals in the SFN zone multiply by the p value.N eNB in the current SFN of the MCE picked at random zone, and will feed back request message and send to this N eNB that selects.
Wherein, the initial value choosing method of p is with first embodiment, and the field that the feedback request message mainly comprises is type of message indication, single frequency network sign, can also comprise the MBMS traffic flag.
After eNB receives this message, will add up receiving this professional UE number in this sub-district, and the number of statistics is sent to MCE, wherein statistical method is identical with first embodiment with feedback system.
UE sum in all feedbacks that MCE will receive obtains the sub-district average user number in this single-frequency network area divided by the eNB number of feedback.
If the sub-district average user number that MCE counts less than first threshold values, then needs the p value is increased, add up again.In the present embodiment, can further revise, the eNB of the needs feedback that selects be indicated with convenient statistics: MCE again.If need statistics again, can judge the eNB that has fed back by sign, picked at random goes out N1 eNB and notifies its feedback to get final product among the eNB that MCE only need never feed back.Wherein, the computational methods of N1 are as follows: the sub-district number in the SFN zone multiply by the p value, deducts the eNB number N of statistics last time.After the single-frequency network area renewal of MCE is finished, will all eNB signs be emptied, show that promptly all eNB did not all feed back.
Need to prove that above method is not only applicable to periodically updating of single-frequency network area, the single frequency network that can be applied under any scene is selected, for example the selection of initial single-frequency network area.
It should be noted that at last, above embodiment is only in order to describe technical scheme of the present invention rather than the present technique method is limited, the present invention can extend to other modification, variation, application and embodiment on using, and therefore thinks that all such modifications, variation, application, embodiment are in spirit of the present invention and teachings.
Claims (10)
1. the regional selection method of a single frequency network comprises:
The feedback proportional that step 10), eNB are determined according to MCE is to receiving certain professional UE number and add up and feeding back to MCE;
Step 20), this professional UE sum of reception in MCE all feedbacks that will receive is divided by the corresponding eNB number of feedback, obtains the sub-district average user number;
Step 30), MCE determines the threshold values that the sub-district average user number limits less than the spectrum efficiency according to different transmission meanss;
Step 40), MCE searches and receives the eNB number of this professional UE number less than the sub-district average user number in the single-frequency network area, determine that feedback proportional equals 1 after, determine the adjustment mode of single-frequency network area to send the eNB of message according to the position of eNB to the needs adjustment.
2. the method for claim 1, wherein, step 10) also comprises: MCE adds up in this sub-district according to its all eNB that control and receives this professional UE number, select to comprise the sub-district number at most and the zone of the threshold values that limits greater than spectrum efficiency of sub-district average user number according to different transmission meanss as the prime area of single frequency network.
3. the method for claim 1, wherein, step 10) also comprises: MCE sends to all eNB in the single-frequency network area with feedback proportional, the random number that eNB determine to produce less than feedback proportional after, add up and feed back to MCE receiving this professional UE number in this sub-district, the statistics message of the described MCE of feeding back to comprises type of message indication, eNB sign, MBMS traffic flag, UE number.
4. the method for claim 1, wherein, step 10) also comprises: it is the eNB of feedback proportional that MCE selects the ratio that accounts for eNB sum in the single-frequency network area at random, send the feedback request message, described eNB receives after this message and to add up and feed back to MCE receiving this professional UE number in this sub-district that described feedback request message mainly comprises type of message indication, single frequency network sign, MBMS traffic flag.
5. the process of claim 1 wherein that in the step 10), MCE determines feedback proportional according to feedback number of base stations and load capacity, the initial value of feedback proportional is got greater than 0 and is determined less than any number of 1 or according to the feedback proportional that used last time.
6. the method for claim 1, wherein, in the step 10), the time of the own the last statistics UE number of eNB record, if eNB receives time difference of time and the last statistics UE number of request that MCE requires its feedback UE number less than certain threshold values, eNB feeds back to MCE with the UE number of the last time statistics.
7. the method for claim 1, wherein, step 20) also comprises: if average user number is greater than certain threshold values, enlarge single-frequency network area, collect among all or part eNB adjacent and receive this professional UE number with this single frequency network, average user number in the calculation plot is determined these sub-districts are merged in the single frequency network.
8. the process of claim 1 wherein step 30) also comprise: if feedback proportional less than 1, increases feedback proportional, if feedback proportional greater than 1, is made as 1 with feedback proportional; Return step 10) and add up UE again; Described threshold values is the critical value of average user number in the sub-district under the described transmission means, and this threshold values equals 2 or 3.
9. the process of claim 1 wherein step 40) in, the message of described transmission comprises type of message indication, single frequency network sign, adjusts action; Wherein, adjust action comprise withdraw from, adding and single frequency network sign change.
10. the method for claim 4, wherein, step 10) also comprises: MCE indicates the eNB that this had fed back, never picked at random goes out N1 eNB and feeds back among the eNB that feeds back, wherein, the sub-district number in the SFN zone multiply by the eNB number N that feedback proportional deducts last time statistics again and obtains N1.
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