CN103024831A - Heterogeneous network base station triggered switching method based on common control carrier (CCC) frame - Google Patents
Heterogeneous network base station triggered switching method based on common control carrier (CCC) frame Download PDFInfo
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- CN103024831A CN103024831A CN2012105112432A CN201210511243A CN103024831A CN 103024831 A CN103024831 A CN 103024831A CN 2012105112432 A CN2012105112432 A CN 2012105112432A CN 201210511243 A CN201210511243 A CN 201210511243A CN 103024831 A CN103024831 A CN 103024831A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention relates to a heterogeneous network base station triggered switching method based on a common control carrier (CCC) frame, in particular to a source base station triggered switching scheme and a target base station triggered switching scheme based on CCC frame time-frequency resource configuration and belongs to the technical field of wireless communication. According to the method, a time-frequency resource configuration method of the CCC radio frame is firstly established, interface time delay of interactive control information among base stations is eliminated, then source base station and target base station triggered switching schemes based on the configuration are respectively provided, when a mobile terminal communicates with the source base station before switching trigger, the periodical measurement for reference signal received power (RSRP) and received signal strength indicator (RSSI) of surrounding base stations is not required, the prediction is performed according to grades of services, and a base station with the optimal grade of service is selected as a target base station to be switched under the condition that the received RSRP and reference signal received quality (RSRQ) of the target base station are ideal and can support user transfer communication. By means of the heterogeneous network base station triggered switching method based on the CCC frame, the energy consumption of the mobile terminal is reduced, and the performance gain is improved.
Description
Technical field
The present invention relates to a kind of changing method of the heterogeneous network base station triggers based on the CCC frame, be specifically related to the handover scheme that a kind of handover scheme that triggers based on the source base station of CCC frame running time-frequency resource configuration and target BS trigger, belong to wireless communication technology field.
Background technology
At the high speed of wireless communication technology, extensively change in the process of development, the user is day by day ardent for the expectation of the demand of fast wireless network and class of business.The higher system performance index that proposes in order to satisfy next generation mobile communication, isomerism becomes one of principal character of future wireless network environment.So-called isomerism refers to that the each several part of construction system is in aspect property of there are differences such as structure, function, character.3GPP has proposed the concept of heterogeneous network, namely disposes the heterogeneous network of low power nodes in whole macrocell, and this node not only relative cost is lower, and can Effective Raise network coverage and enhanced quality-of-service.Typical low power nodes comprises relaying (Relay) node, Pico cell (Picocell) and femtocell (Femtocell), for the covering of indoor and hot zones provides better guarantee with accessing at a high speed, has eliminated simultaneously blind spot region.
In traditional handover scheme, when portable terminal moves from a residential quarter to another residential quarter in the process of communication, receive from the signal quality of source base station worse and worse, meanwhile receive from the signal quality of neighbor base station and become better and better, when portable terminal continues to move, therefore the situation that communication disruption can occur need to the communication that portable terminal is current switches on the channel of new base station to keep the continuity of communication.In order to realize above-mentioned switching, at first need to trigger switching, secondly need to choose the target BS of switching, again need communication data is dumped to target BS from source base station, last portable terminal access target BS and disconnection are communicated by letter with source base station.The tradition handover scheme flow process as shown in Figure 1, its switch step is as follows:
1) portable terminal with the source base station communication process in periodic measurement from descending RSRP (the Reference Signal Received Power of source base station and neighbor base station, Reference Signal Received Power) with RSSI (Received Signal Strength Indication, the indication of receiver signal field intensity).
2) when the RSRP of source base station is lower than a certain threshold value of RSRP of neighbor base station, triggers and switch.
3) portable terminal carries out switch decision, at first determine to meet the target BS set that triggers switching condition, then in the target BS set, choose the neighbor base station of RSRP and RSRQ (Reference Signal ReceivingQuality receives signal receiving quality) weighted value maximum as the target BS that switches.
4) portable terminal reports target BS to source base station.
5) source base station sends " HO(HandOver switches) pre-notice request " information by X2 or S1 interface to target BS.
6) target BS sends " the pre-push-notification-answer of HO " by X2 or S1 interface to source base station, and content is preallocated RB(Resource Block, Resource Block).
7) source base station begins to the current communication data of target BS unloading portable terminal.
8) after data buffer storage exchanged and finishes, the RB access target BS of source base station indicating mobile terminal use appointment and disconnection were communicated by letter with source base station.
9) portable terminal uses the RB access target BS of appointment and disconnects and the communicating by letter of source base station.
Although traditional handover scheme is widely adopted, but can not fully excavate the performance advantage of heterogeneous network, therefore a kind of novel handover scheme that brings out the best in each other with heterogeneous network of needs invention solves the problem in traditional handover scheme: at first, come control information between the interacting base station with X2 or S1 interface in the switching, can produce larger time delay; Secondly, the tradition handover scheme is based on the switching that portable terminal triggers, and namely before the handover trigger, the portable terminal of communicating by letter needs periodic measurement from descending RSRP and the RSSI of source base station and neighbor base station, therefore the power consumption of portable terminal is larger, is unfavorable for user's business experience; At last, compare the less target BS of RSRP and RSRQ, the target BS that RSRP and RSRQ are larger differs provides best communication performance to portable terminal surely, has therefore limited the performance gain of system.
Summary of the invention
The objective of the invention is for the problem in traditional handover scheme, propose a kind of changing method of the heterogeneous network base station triggers based on the CCC frame.
The present invention has at first designed a kind of CCC(Common Control Carrier, public control carrier wave) the running time-frequency resource collocation method of radio frames, by transmission CCC radio frames information, eliminated the interface time delay of mutual control information between the base station; Secondly the handover scheme of source base station and target BS triggering has been proposed respectively, to reduce the portable terminal energy consumption, to improve the performance gain that switches based on this configuration.
For Macro a bunch of comprising M adjacent Macro zone, i Macro zone comprises 1 MBS(Macro Base Station, macro base station) and N
i-1 LPN(Low Power Node, low power nodes), i=1,2 ..., M.Different Macro use different CCC frequently in the zone, and one Macro bunch is used M different CCC frequently altogether.The running time-frequency resource collocation method of Macro bunch CCC radio frames is:
If the CCC frame that use in each Macro zone forms by the N that is distributed in the different time-gap position the identical time/frequency source block of size, wherein N=max{N
1, N
2..., N
M.The CCC information of other base station broadcast can only in self time/frequency source block broadcasting CCC information, be intercepted in each base station in the single Macro zone in other time/frequency source block.The broadcast cycle of Macro bunch CCC frame is N time slot, the content of this radio frames carrying comprises identification number, handover information, is switched information and sub-clustering interference coordination information, wherein identification number is the base station IDs of broadcast message, handover information is ID set and the handover request of handover-target base station, the information of being switched comprise source base station ID, RB_index, portable terminal measure ask, can switch, preallocated RB and service level prediction, sub-clustering interference coordination information is the interference reference signal.Wherein RB_index is the label of RB.
For portable terminal, switch to MBS by MBS, perhaps LPN switches to MBS, and perhaps LPN switches to the scene of LPN, and concrete switch step is as follows:
And calculate the path loss of institute's service mobile terminal and this source base station step 2.1, the up RSRP(Reference Signal Received Power of source base station periodic measurement institute service mobile terminal).
Step 2.2, source base station comprehensively compare the size of uplink receiving power RSRP and path loss, judge whether institute's service mobile terminal satisfies the triggering switching condition.The RSRP that described triggering switching condition is this terminal is less than the threshold value ε of RSRP under the current circuit loss
1ε
1Require to set according to the communication quality requirement of portable terminal and the traffic carrying capacity of system.
Step 2.3, measure to prepare: if institute's service mobile terminal satisfies the condition of switching that triggers, then source base station notifies this portable terminal to prepare to measure RSRP and the indication of RSSI(receiver signal field intensity of self all base station in place Macro bunch).
Step 2.4, the described portable terminal of step 2.3 calculates by measuring, the RSRP and the RSRQ(that obtain all base stations in this Macro bunch receive signal receiving quality), choose RSRP and RSRQ weighted value greater than threshold value ε
2The base station as the target BS that switches, form the potential target base station set.ε
2Require to set according to the communication quality requirement of portable terminal and the traffic carrying capacity of system.
Step 2.5, portable terminal reports the potential target base station set to the source base station that it is given notice.
Step 2.6 is received the source base station of potential target base station aggregate information, and self the CCC time/frequency source block in next broadcast cycle is gathered multicast " the pre-notice request of HO " information to potential target base station.
Step 2.7, after potential target base station is received " the pre-notice request of HO " information, judge whether to accept switching according to own service amount load, and determine the content of " the pre-push-notification-answer of HO ": if accept to switch then response contents for agree to switch, preallocated RB and service level prediction; If do not accept to switch then response contents for disagreeing with switching.
Step 2.8, if agree to switch, potential target base station is integrated into self CCC time/frequency source block in the next broadcast cycle to the source base station clean culture of it being sent " the pre-notice request of HO " " the pre-push-notification-answer of HO " information.
Step 2.9 prepare to be switched: receive that the source base station of " the pre-push-notification-answer of HO " in the potential target base station set of accepting to switch, chooses the highest base station of service level prediction as the target BS that switches, enter the handoff procedure of step 2.10.
Step 2.10, source base station is to the current communication data of target BS unloading portable terminal.
Step 2.11, after the data buffer storage exchange end, the RB described target BS of access step 2.10 of source base station indication institute service mobile terminal use appointment and disconnection are communicated by letter with this source base station.
Step 2.12, the RB access target BS of portable terminal use appointment and disconnection are communicated by letter with this source base station.
Step 3, the running time-frequency resource collocation method that step 1 is set up is applied to the switching that target BS triggers
For portable terminal, switch to the scene of LPN by MBS, the concrete switch step of based target base station triggers is as follows:
Step 3.1, in same Macro bunch, all LPN target BS periodic measurements calculate, and obtain received power RSRP and the rate of change RSRP ' thereof of each RB in the MBS uplink band, find out RSRP and RSRP ' greater than threshold value ε
3And continue for some time the RB_index of t, its corresponding target BS forms the potential target base station set.
Described threshold value ε
3Require to set according to the communication quality requirement of portable terminal and the traffic carrying capacity of system; Duration t can guarantee to obtain the rate of change of RSRP, and satisfies the real-time of measurement result.
The MBS clean culture " LPN_ID, RB_index information and portable terminal measure request " of step 3.2, each potential target base station self the CCC time/frequency source block in next broadcast cycle under to it.Total m of MBS under all potential target base station correspondences that step 3.1 obtains.
Step 3.3, measure to prepare: each MBS that step 3.2 obtains obtains self and uses the corresponding portable terminal of RB_index by searching, and portable terminal corresponding to notice prepares to measure RSRP and the RSSI of all potential target base stations corresponding to this source base station MBS and this source base station MBS.The m that step 3.2 an obtains MBS is a corresponding k portable terminal altogether.
Step 3.4, each portable terminal measurement that step 3.3 obtains calculates RSRP and the RSRQ of all potential target base stations of all source base station MBS that it is given notice and corresponding MBS, and the potential target base station of selecting RSRP and RSRQ weighted value maximum is as target BS.
Step 3.5, the target BS that each portable terminal reports step 3.4 to obtain to all source base station MBS that it is given notice.
Step 3.6, self the CCC time/frequency source block of each source base station MBS in next broadcast cycle is to its corresponding target BS LPN_ID clean culture " the pre-notice request of HO " information.
Step 3.7 receives that the LPN_ID of " the pre-notice request of HO " according to the traffic load of self, judges whether to accept switching, and determines the content of " the pre-push-notification-answer of HO ": response contents is agreement switching, preallocated RB if accept to switch then; If do not accept to switch then response contents for disagreeing with switching.
Step 3.8, if agree to switch, self the CCC time/frequency source block of LPN_ID in next broadcast cycle to it under source base station MBS clean culture " the pre-push-notification-answer of HO " information.
Step 3.9, prepare to switch: the source base station MBS that receives " the pre-push-notification-answer of HO " determines whether LPN_ID as the target BS that switches, if then prepare to enter the handoff procedure of step 3.10.
Step 3.10, source base station MBS is to the current communication data of LPN_ID unloading.
Step 3.11, after data buffer storage exchange finished, source base station MBS indicated its corresponding portable terminal to use the RB described LPN_ID of access step 3.10 of appointment and disconnects and the communicating by letter of this MBS.
Step 3.12, portable terminal are used the RB access LPN_ID of appointment, and disconnect the communication of the MBS corresponding with it.
Beneficial effect
Contrast prior art, beneficial effect of the present invention are, at first, adopt CCC broadcasting to need mutual control signal, compare traditional method of passing through control signal between X2 or S1 interactive interfacing base station, have shortened the propagation delay time of control signal.Secondly, the triggering that portable terminal switches finished by source base station or target BS so the portable terminal of communicating by letter with source base station before handover trigger, do not need RSRP and the RSSI of periodic measurement peripheral base station, reduced the energy consumption of portable terminal.At last, the criterion of choosing target BS in the handover scheme also has service level prediction except RSRP and RSRQ, guaranteeing to receive the RSRP of target BS and RSRQ is more satisfactory and can support in the situation of user's call forwarding, choosing the highest base station of the grade of service (throughput) switches as target BS, compare with the Criterion of Selecting of the target BS that only has RSRP and RSRQ, the target BS Criterion of Selecting that adopts among the present invention has improved performance gain.
The figure explanation
Fig. 1 is the flow chart of traditional handover scheme;
Fig. 2 is the running time-frequency resource allocation plan of the CCC radio frames that proposes of the present invention;
Fig. 3 is the content of the CCC radio frames carrying that proposes of the present invention;
Fig. 4 is the handover scheme flow chart based on the source base station triggering that the present invention proposes;
Fig. 5 is the handover scheme flow chart of the based target base station triggers that proposes of the present invention;
Fig. 6 be in the embodiment of the invention Macro and Pico coexistence mix the isomery scene graph.
Embodiment
For the purpose, technical scheme and the advantage that make invention is clearer, embodiments of the present invention is described in detail below in conjunction with figure.Present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In the mixing isomery scene of MBS and LPN, the LPN multi-section is deployed on indoor, is used for strengthening the indoor wireless transmission performance or eliminates blind spot region.
The running time-frequency resource of Macro bunch CCC radio frames disposes as shown in Figure 2, and wherein the longitudinal axis represents frequency, and transverse axis represents the time.The M of a longitudinal axis frequency range represents the CCC that M different frequencies are used in M Macro zone, and the N of a transverse axis time slot represents the time/frequency source block that all base stations in each Macro zone can be used for broadcast message altogether.Because the total number of base in some Macro zone is less than N, so vacant time/frequency source block can appear in the CCC frame in this Macro zone.The base station be used for broadcast message its frame structure carrying of CCC time/frequency source block content as shown in Figure 3.
Be without loss of generality, present embodiment, a kind of LTE isomery scene be Macro with Pico mix isomery scene, the transmitting power 40w of MBS, PBS(Pico Base Station, microcell base station) transmitting power 200mw.As shown in Figure 6, this Macro bunch comprises two Macro zones, wherein, and 1 Macro base station of Marco1 district inclusion (MBS_1), 3 low power nodes (PBS_11, PBS_12, PBS_13) and 2 portable terminals (UE_11, UE_12); 1 Macro base station of Macro2 district inclusion (MBS_2), 1 low power nodes (PBS_21) and 1 portable terminal (UE_21).Can be got by above-mentioned scene layout, 2 different CCC are frequently used in 2 Macro zones in this Macro bunch, and the CCC frame that each MBS uses all has 3 time/frequency source block that size is identical, so the broadcast cycle of Macro bunch CCC frame is 3 time slots.
1. the handover scheme that triggers based on source base station
The handover scheme flow chart that triggers based on source base station as shown in Figure 4.
The handover measurement of this handover scheme is triggered by source base station, and portable terminal to receive the signal quality that comes from source base station relatively poor.Therefore, be applicable to portable terminal and move to MBS by MBS, perhaps PBS moves to MBS, perhaps PBS moves to the scene of PBS, as shown in Figure 6, heavy line represents communicating by letter of source base station and portable terminal, the switching that the dotted line representative triggers based on source base station, by the switch to example of PBS_11 to PBS_12, concrete steps are as follows with mobile terminal UE _ 11:
1) the uplink reference signals received power P_11 of the service mobile terminal UE_11 of source base station PBS_11 periodic measurement institute, and calculate the path loss L_11 of institute's service mobile terminal and source base station.
2) PBS_11 comprehensively compares the size of uplink reference signals received power P_11 and path loss L_11, judges whether UE_11 satisfies the condition of switching that triggers.3) measure preparation: if UE_11 satisfies the condition of switching that triggers, RSRP and the RSSI of all base stations (PBS_11, PBS_12, PBS_13, PBS_2, MBS_1 and MBS_2) in then PBS_11 notice UE_11 preparation is measured this Macro bunch.
4) the UE_11 measurement calculates RSRP and the RSRQ of all base stations in this Macro bunch, chooses the larger base station of RSRP and RSRQ weighted value (PBS_12, PBS_21) as the potential target base station set of switching.
5) UE_11 reports the potential target base station set to PBS_11.
6) self the CCC time/frequency source block of PBS_11 in next broadcast cycle is to potential target base station set (PBS_12, PBS_21) multicast " the pre-notice request of HO " information.
7) potential target base station PBS_12 and PBS_21 load according to the own service amount and judge whether to accept switching, and determine the content of " the pre-push-notification-answer of HO ": response contents is agreement switching, preallocated RB and service level prediction if accept to switch then; If do not accept to switch then response contents for disagreeing with switching.
8) agree to switch after, PBS_12 and PBS_21 self the CCC time/frequency source block in next broadcast cycle is to PBS_11 clean culture " the pre-push-notification-answer of HO " information.
9) prepare to switch: PBS_11 chooses the highest base station of service level prediction (PBS_12) as the target BS that switches in the potential target base station set (PBS_12, PBS_21) of accepting to switch.
10) PBS_11 begins the current communication data to PBS_12 unloading UE_11.
11) after the data buffer storage exchange end, the RB access PBS_12 of PBS_11 indication UE_11 use appointment and disconnection are communicated by letter with PBS_11's.
12) UE_11 uses the RB access PBS_12 of appointment and disconnects and the communicating by letter of PBS_11.
2. the handover scheme of based target base station triggers
The handover scheme flow chart of based target base station triggers as shown in Figure 5.
The handover measurement of this scheme is triggered by target BS, and portable terminal to receive the signal quality that comes from source base station and LPN all better.Therefore, be applicable to portable terminal is moved to LPN by MBS scene, as shown in Figure 6, heavy line represents communicating by letter of source base station and portable terminal, fine line represents the switching of based target base station triggers, take the Macro1 zone as example, mobile terminal UE _ 12 switch to PBS_13 by MBS_1, and concrete steps are as follows:
1) all target BS (PBS_11, PBS_12 and PBS_13) periodic measurement calculates received power RSRP and the rate of change RSRP ' thereof of each RB on the uplink band of source base station MBS_1 in the Macro1 zone, finds out RSRP and RSRP ' greater than certain threshold value and the RB_1 that continues for some time.
2) potential target base station PBS_12 and PBS_13 self the CCC time/frequency source block in next broadcast cycle is respectively to the information of source base station MBS_1 clean culture " ID of PBS, RB_1 and request portable terminal are measured ".
3) measure preparation: MBS_1 finds the portable terminal that uses this RB_1 and is UE_12, and notice UE_12 prepares to measure RSRP and the RSSI of MBS_1 and potential target base station PBS_12, PBS_13.
4) the UE_12 measurement calculates RSRP and the RSRQ of MBS_1 and potential target base station PBS_12, PBS_13, and the potential target base station of selection RSRP and RSRQ weighted value maximum is as target BS.
5) UE_12 reports target BS (PBS_13) to MBS_1.
6) self the CCC time/frequency source block of MBS_1 in next broadcast cycle is to target BS PBS_13 clean culture " the pre-notice request of HO " information.
7) PBS_13 judges whether to accept switching according to own service amount load, and determines the content of " the pre-push-notification-answer of HO ": response contents is that agreement is switched, preallocated RB if accept to switch then; If do not accept to switch then response contents for disagreeing with switching.
8) agree to switch after, self the CCC time/frequency source block of PBS_13 in next broadcast cycle is to MBS_1 clean culture " the pre-push-notification-answer of HO " information.
9) prepare to switch: MBS_1 determines that PBS_13 can be used as the target BS of switching, and prepares to switch.
10) MBS_1 begins to PBS_13 unloading data.
11) after data buffer storage exchanged and finishes, the RB access PBS_13 of indicating mobile terminal UE_12 use appointment and disconnection were communicated by letter with MBS_1's.
12) mobile terminal UE _ 12 is used the RB access PBS_13 of appointments and is disconnected and the communicating by letter of MBS_1.
Above-described specific descriptions; purpose, technical scheme and beneficial effect to invention further describe; institute is understood that; the above only is preferred embodiment of the present invention; the protection range that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. changing method based on the heterogeneous network base station triggers of CCC frame is characterized in that: may further comprise the steps:
Step 1 is set up the running time-frequency resource collocation method of CCC radio frames
For Macro a bunch of comprising M adjacent Macro zone, i Macro zone comprises 1 MBS and N
i-1 LPN, i=1,2 ..., M; Different Macro use different CCC frequently in the zone, and one Macro bunch is used M different CCC frequently altogether; The running time-frequency resource collocation method of Macro bunch CCC radio frames is:
If the CCC frame that use in each Macro zone forms by the N that is distributed in the different time-gap position the identical time/frequency source block of size, wherein N=max{N
1, N
2..., N
M; The CCC information of other base station broadcast is intercepted in self time/frequency source block broadcasting CCC information in each base station in the single Macro zone in other time/frequency source block; Macro bunch CCC frame broadcast cycle is N time slot, its carrying content comprises identification number, handover information, is switched information and sub-clustering interference coordination information, wherein identification number is the base station IDs of broadcast message, handover information is ID set and the handover request of handover-target base station, the information of being switched comprise source base station ID, RB_index, portable terminal measure ask, can switch, preallocated RB and service level prediction, sub-clustering interference coordination information is the interference reference signal; RB_index is the label of RB;
Step 2, the running time-frequency resource collocation method that step 1 is set up is applied to the switching that source base station triggers, and concrete switch step is:
Step 2.1, the up RSRP of source base station periodic measurement institute service mobile terminal, the path loss of calculating institute's service mobile terminal and this source base station;
Step 2.2, source base station be more up RSRP and path loss size comprehensively, judges whether institute's service mobile terminal satisfies the triggering switching condition;
Step 2.3, measure to prepare: if institute's service mobile terminal satisfies the condition of switching that triggers, then source base station notifies this portable terminal to prepare to measure RSRP and the RSSI of self all base station in place Macro bunch;
Step 2.4, the described portable terminal measurement of step 2.3 calculates RSRP and the RSRQ of all base stations in this Macro bunch, chooses RSRP and RSRQ weighted value greater than threshold value ε
2The base station as the target BS that switches, form the potential target base station set;
Step 2.5, portable terminal reports the potential target base station set to the source base station that it is given notice;
Step 2.6 is received the source base station of potential target base station aggregate information, and self CCC time/frequency source block is gathered multicast " the pre-notice request of HO " information to potential target base station in next broadcast cycle;
Step 2.7, after potential target base station is received " the pre-notice request of HO " information, judge whether to accept switching according to own service amount load, and determine " the pre-push-notification-answer of HO " content: if accept to switch then response contents for agree to switch, preallocated RB and service level prediction; If do not accept to switch then response contents for disagreeing with switching;
Step 2.8, if agree to switch, potential target base station is integrated into self CCC time/frequency source block in the next broadcast cycle to the source base station clean culture of it being sent " the pre-notice request of HO " " the pre-push-notification-answer of HO " information;
Step 2.9 prepare to be switched: receive that the source base station of " the pre-push-notification-answer of HO " in the potential target base station set of accepting to switch, chooses the highest base station of service level prediction as the target BS that switches, enter the handoff procedure of step 2.10;
Step 2.10, source base station is to the current communication data of target BS unloading portable terminal;
Step 2.11, after the data buffer storage exchange end, the RB described target BS of access step 2.10 of source base station indication institute service mobile terminal use appointment and disconnection are communicated by letter with this source base station;
Step 2.12, the RB access target BS of portable terminal use appointment and disconnection are communicated by letter with this source base station;
Step 3, the running time-frequency resource collocation method that step 1 is set up is applied to the switching that target BS triggers, and concrete switch step is:
Step 3.1, in same Macro bunch, received power RSRP and rate of change RSRP ' thereof that all LPN target BS periodic measurements calculate each RB in the MBS uplink band find out RSRP and RSRP ' greater than threshold value ε
3And continue for some time the RB_index of t, the target BS that it is corresponding is as potential target base station;
The MBS clean culture " LPN_ID, RB_index information and portable terminal measure request " of step 3.2, each potential target base station self the CCC time/frequency source block in next broadcast cycle under to it;
Step 3.3, measure to prepare: each MBS that step 3.2 obtains obtains self and uses the corresponding portable terminal of RB_index by searching, and portable terminal corresponding to notice prepares to measure RSRP and the RSSI of this source base station MBS and all potential target base stations corresponding with this source base station MBS;
Step 3.4, each portable terminal measurement that step 3.3 obtains calculates RSRP and the RSRQ of all potential target base stations of all source base station MBS that it is given notice and corresponding MBS, and the potential target base station of selecting RSRP and RSRQ weighted value maximum is as target BS;
Step 3.5, the target BS that each portable terminal reports step 3.4 to obtain to all source base station MBS that it is given notice;
Step 3.6, self the CCC time/frequency source block of each source base station MBS in next broadcast cycle is to its corresponding target BS LPN_ID clean culture " the pre-notice request of HO " information;
Step 3.7, receive that the LPN_ID of " the pre-notice request of HO " according to own service amount load, judges whether to accept switching, and determines the content of " the pre-push-notification-answer of HO ": response contents is that agreement is switched, preallocated RB if accept to switch then; If do not accept to switch then response contents for disagreeing with switching;
Step 3.8, if agree to switch, self the CCC time/frequency source block of LPN_ID in next broadcast cycle to it under source base station MBS clean culture " the pre-push-notification-answer of HO " information;
Step 3.9, prepare to switch: the source base station MBS that receives " the pre-push-notification-answer of HO " determines whether LPN_ID as the target BS that switches, if then prepare to enter the handoff procedure of step 3.10;
Step 3.10, source base station MBS is to the current communication data of LPN_ID unloading;
Step 3.11, after data buffer storage exchange finished, source base station MBS indicated its corresponding portable terminal to use the RB described LPN_ID of access step 3.10 of appointment and disconnects and the communicating by letter of this MBS;
Step 3.12, portable terminal are used the RB access LPN_ID of appointment, and disconnect the communication of the MBS corresponding with it.
2. the changing method of a kind of heterogeneous network base station triggers based on the CCC frame according to claim 1, it is characterized in that: the described handover scheme of step 2 is applicable to for portable terminal, switch to MBS by MBS, perhaps LPN switches to MBS, and perhaps LPN switches to the scene of LPN.
3. the changing method of a kind of heterogeneous network base station triggers based on the CCC frame according to claim 1, it is characterized in that: the described handover scheme of step 3 is applicable to for portable terminal, is switched to the scene of LPN by MBS.
4. the changing method of a kind of heterogeneous network base station triggers based on the CCC frame according to claim 1, it is characterized in that: the RSRP that the described triggering switching condition of step 2.2 is portable terminal is less than the threshold value ε of RSRP under the current circuit loss
1ε
1Require to set according to the communication quality requirement of portable terminal and the traffic carrying capacity of system.
5. the changing method of a kind of heterogeneous network base station triggers based on the CCC frame according to claim 1 is characterized in that: ε
2Require to set according to the communication quality requirement of portable terminal and the traffic carrying capacity of system.
6. the changing method of a kind of heterogeneous network base station triggers based on the CCC frame according to claim 1 is characterized in that: described threshold value ε
3Require to set according to the communication quality requirement of portable terminal and the traffic carrying capacity of system; Duration t can guarantee to obtain the rate of change of RSRP, and satisfies the real-time of measurement result.
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