CN1949918A - Double playing switching method and apparatus under two-layer node network architecture - Google Patents
Double playing switching method and apparatus under two-layer node network architecture Download PDFInfo
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- CN1949918A CN1949918A CNA2005101125664A CN200510112566A CN1949918A CN 1949918 A CN1949918 A CN 1949918A CN A2005101125664 A CNA2005101125664 A CN A2005101125664A CN 200510112566 A CN200510112566 A CN 200510112566A CN 1949918 A CN1949918 A CN 1949918A
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Abstract
The invention discloses a double-cast switching method and device in two-layer node network structure, where the two-layer nodes comprise edge radio station (ERS) and IP access gateway (IAGW); the first switching condition determining device on source ERS (SERS) utilizes the measured value received from user equipment (UE) to determine UE needs switching to target ERS (TERS) according to the first switching condition, it switches preparation controller to initiate switching preparation course; in the switching preparation course, IAGW starts issuing data to SERS and TERS in double-cast mode, and when the second switching condition determining device on the SERS utilizes the measured value received from the UE to determine to require initiating switching executing course according to the second switching condition, it switches executing control device to terminate the switching preparation course and initiate the switching executing course. Thus, it effectively overcomes the defect that data is easy to lose in the existing soft-switching flow.
Description
Technical field
The present invention relates to a kind of mobile communication system, relate in particular to a kind of soft handover method and equipment in the mobile communication system.
Background technology
UMTS is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface technologies, is called universal mobile telecommunications system, also the UMTS system is called the WCDMA communication system usually.The UMTS system has adopted and the similar structure of second generation mobile communication system, comprise Radio Access Network (Radio AccessNetwork, RAN) and core network (Core Network, CN).Wherein, Radio Access Network is used to handle all and wireless function associated, and CN handles that all voice calls are connected with data in the UMTS system, and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).(User Equipment UE) has constituted whole UMTS system together for UTRAN, CN and subscriber equipment.Its system configuration as shown in Figure 1.
UTRAN is a land radio access web, and it comprises one or several RNS (RNS).A RNS is made up of a radio network controller (RNC) and one or more base station (NodeB).Interface between RNC and the CN is the Iu interface, and NodeB is connected by Iub interface with RNC.In UTRAN inside, interconnected by Iur between the radio network controller (RNC), Iur can be that the direct physical between the RNC connects or the connection by transmission network.RNC is used for distributing and is attached thereto with control or the Radio Resource of relevant NodeB.NodeB then finishes the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously.The structure of UTRAN is as shown in Figure 2:
NodeB is the base station (being radio receiving-transmitting unit) of WCDMA system, comprises radio receiving-transmitting unit and Base-Band Processing parts.By the Iub interface and the RNC interconnection of standard, mainly finish the processing of Uu interface physical layer protocol.Its major function is spread spectrum, modulation, chnnel coding and despreading, demodulation, channel-decoding, also comprises the functions such as mutual conversion of baseband signal and radiofrequency signal.
RNC is a radio network controller, is used to control the Radio Resource of UTRAN, mainly finishes functions such as connection foundation and disconnection, switching, the merging of grand diversity, RRM control.Specific as follows:
(1) executive system information broadcast and system's access control function;
(2) switching and RNC migration mobile management functions such as (Relocation are also referred to as reorientation);
(3) RRM and controlled function such as grand diversity merging, power control, radio bearer distribution.
In the WCDMA system, a key technology of introducing is exactly a soft handover.The Ec/I of the CPICH channel of UE measure neighbor cells
0, according to measuring foundation and safeguarding a down channel (DCH) Active Set, keep soft handover with the sub-district in the DCH Active Set and be connected, keep transfer of data.Sub-district in the Active Set can belong to same base station also can belong to different base stations.Can only carry out the direct-cut operation of different base station minizone compares with the gsm system that belongs to second generation mobile communication system, soft handover has improved the data smoothing transmission of user in the different base station minizone, make that professional service quality is relatively good, be not easy to cause loss of data.
Below with reference to Fig. 3, a kind of existing two-layer node evolution architecture is described.
3GPP considers the competitiveness of future network, is considering that at present network in this how evolution in future, has a variety of evolution schemes to launch discussion at 3GPP.The purpose of network evolution is to be desirable to provide a kind of low time delay, high data rate, high power system capacity and covering, low cost, complete IP-based network.
Network evolution has multiple candidate scheme, and wherein popular have a two-layer node network architecture.Under this framework, wireless base station, edge (ERS, Edge Radio Station) is the Node B after the evolution, has most of function of former RNC, and takes new physical-layer techniques, such as OFDM; IP IAD (IAGW, IP Access Gateway) has the function of part SGSN and the function of former GGSN.
In order to guarantee the smooth evolution of existing UTRAN framework, the two-layer node framework has been reused existing protocol to greatest extent.At the wireless interface oral-lateral, ERS has merged most of function of former RNC, so except keeping original physical (L1), added MAC layer, rlc layer, PDCP layer again.Between ERS and the IAGW, then adopt the tunnel related protocol of GPRS Tunnel Protocol user face (GTP-U).Two-layer node network architecture after the evolution owing to moving down of Radio interface protocols stack or user face protocol stack reduced transmission node, makes call setup time-delay and transmission delay shorten, and has improved data transmission performance.
In evolution architecture, ERS directly inserts IAGW, if will realize adopting the soft handover of macro diversity mode between ERS, only adopts two modes of broadcasting at the IAGW place, sends data to wireless base station, edge, source (SERS) and object edge wireless base station (TERS) respectively.Because in the two-layer node framework, ERS meeting buffer memory has been handed down to UE but has not received the Frame of affirmation, so can there be the Frame before the TERS adding Active Set in the buffering area of SERS.After handoff procedure was finished, along with UE constantly moves to TERS, the link-quality between itself and SERS constantly worsened, until deleting from Active Set.Do not finish and issue as if the Frame before the TERS adding Active Set of its inner buffer this moment, then can cause loss of data.
Summary of the invention
In order to overcome the defective that data are lost easily in the existing soft hand-off, the invention provides a kind of double playing switching method and equipment under two-layer node network architecture.
On the one hand, propose the double playing switching method under a kind of two-layer node network architecture, this two-layer node comprises wireless base station, edge (ERS) and IP IAD (IAGW).Wherein, wireless base station, edge (ERS) is divided into wireless base station, edge, source (SERS) and object edge wireless base station (TERS) in handoff procedure.The method comprising the steps of: A, determine that according to first switching condition subscriber equipment (UE) needs when object edge wireless base station (TERS) switches when wireless base station, edge, source (SERS), initiate the switching set-up procedure; B, IP IAD (IAGW) begins to adopt two broadcast modes respectively after wireless base station, edge, source (SERS) and object edge wireless base station (TERS) issue data in switching set-up procedure, when wireless base station, edge, source (SERS) determines that according to second switching condition needs are initiated hand-off execution process, stop switching set-up procedure and initiating hand-off execution process.
First switching condition among the above-mentioned steps A is that in very first time section, subscriber equipment (UE) meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports.
Second switching condition among the above-mentioned steps B is that in second time period, subscriber equipment (UE) meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports.
Above-mentioned switching judging algorithm is that the difference between cell-of-origin signal strength measurement and the Target cell signal strength measurement is smaller or equal to the difference of handoff threshold value and handoff threshold lagged value.
These two durations of the very first time section and second time period are determined according to RRM RRM algorithm and site environment actual measurement.
Switching set-up procedure among the above-mentioned steps A further comprises: IP IAD (IAGW) is initiated transmission link to object edge wireless base station (TERS) and is set up process after receiving that the message of set-up procedure is switched in the triggering of sending wireless base station, edge, source (SERS); After IP IAD (IAGW) receives that the transmission link of object edge wireless base station (TERS) feedback is set up successful message, adopt two broadcast modes to send downlink data to wireless base station, edge, source (SERS) and object edge wireless base station (TERS), send the message that triggers hand-off execution process to wireless base station, edge, source (SERS) simultaneously.
Above-mentioned steps B further comprises: after receiving the message of the triggering hand-off execution process that IP IAD (IAGW) is sent, the measured value that wireless base station, edge, source (SERS) utilizes subscriber equipment (UE) to report judges whether to satisfy second switching condition, if satisfy, then wireless base station, edge, source (SERS) stops switching set-up procedure, and notifying user equipment (UE) adds its Active Set with the above-mentioned transmission link that object edge wireless base station (TERS) sets up.
Above-mentioned steps B also comprises: if do not satisfy second switching condition, then wireless base station, edge, source (SERS) initiates the transmission link dispose procedure by IP IAD (IAGW) to object edge wireless base station (TERS).
First switching condition among the above-mentioned steps A is that object edge wireless base station (TERS) that is reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) reach the switching preparation threshold value.
Second switching condition among the above-mentioned steps B is that object edge wireless base station (TERS) that is reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) reach to switch carries out threshold value.
On the other hand, propose two under a kind of two-layer node network architecture and broadcast switching device, this two-layer node comprises wireless base station, edge (ERS) and IP IAD (IAGW).This equipment is positioned on the wireless base station, edge (ERS), comprising: the first switching condition judgment means is used for judging whether that according to first switching condition needs trigger the switching set-up procedure; Switch the prepare control device, be used for controlling the switching set-up procedure according to the judged result of first switching condition judgment means output; The second switching condition judgment means is used for judging whether that according to second switching condition needs trigger hand-off execution process; Switch and carry out control device, be used for controlling hand-off execution process according to the judged result of second switching condition judgment means output.
The above-mentioned first switching condition judgment means further comprises: the first switching condition setting device is used for first switching condition and is set to subscriber equipment (UE) and meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports in very first time section.
The above-mentioned second switching condition judgment means further comprises: the second switching condition setting device is used for second switching condition and is set to subscriber equipment (UE) and meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports in second time period.
The above-mentioned first switching condition judgment means further comprises: the first switching condition setting device is used for that first switching condition is set to the object edge wireless base station (TERS) that reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) reaches the switching preparation threshold value.
The above-mentioned second switching condition judgment means further comprises: the second switching condition setting device is used for second switching condition and is set to the object edge wireless base station (TERS) that reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) and reaches to switch and carry out threshold value.
The present invention has obtained following advantages and characteristics.Improved soft handover method and equipment that this invention proposed adopt RRM (RRM) algorithm of optimizing, and have overcome the defective that data are lost easily in the existing soft handoff procedure effectively.
Description of drawings
Fig. 1 is the structural representation of UMTS system;
Fig. 2 is the schematic network structure of UTRAN;
Fig. 3 illustrates a kind of existing two-layer node network evolution architecture;
Fig. 4 illustrates a kind of two-layer node framework user face protocol stack;
Fig. 5 is the transfer of data flow process schematic diagram after switching;
Fig. 6 is the flow chart according to the described soft handover method of one embodiment of the invention;
Fig. 7 is two structural representations of broadcasting switching device of carrying out the method for the invention.
Embodiment
In existing migration flow process, can there be object edge wireless base station (TERS) in the buffering area of wireless base station, edge, source (SERS) and adds Active Set Frame before.If SERS constantly worsens owing to its link-quality, when from Active Set, deleting, Frame before the TERS adding Active Set of its inner buffer does not also issue and finishes, and then may cause lot of data to be lost, and makes user's professional receptive substance quantitative change get very poor.The present invention proposes a kind of new soft handoff procedure,, guarantee the quality that the user is switched to overcome the defective of existing soft handoff procedure obliterated data.
The present invention is split as two time periods with existing handover evaluation time T: switch estimated time section T1 and switch acknowledging time section T2.The duration of two time periods is provided with according to different RRM algorithms and actual site environment actual measurement to be decided.In switching estimated time section T1, if the measured value that UE reports is all the time in predetermined number range, then SERS initiates to switch set-up procedure.After set-up procedure was finished, SERS waited the to be switched acknowledging time section T2 time before the formal UE of triggering switches.If the measured value that reports of UE is from switching estimated time section T1 to switching acknowledging time section T2 all the time in predetermined number range, then SERS formally triggers handoff procedure.In switching acknowledging time section T2,, can trigger switching in advance if the signal quality of SERS worsens suddenly.To be described below according to the described whole switching flow of method of the present invention.
If in time interval T1, in the measurement report that UE reports, difference between current area signal strength signal intensity and Target cell signal strength signal intensity continues the difference smaller or equal to handoff threshold value and handoff threshold lagged value, ERS sends transmission link to CN and sets up requirement (Transport Link Setup Required) message so, initiates switching preparation process.Soft handover evaluation algorithm is herein defined by following formula:
Old_Sign-Meas_Sign≤AS_Th-AS_Th_Hyst
Variable-definition in the formula is as follows: Meas_Sign is the signal strength measurement of Target cell, and Old_Sign is the signal strength measurement of cell-of-origin, and AS_Th is grand diversity threshold, and AS_Th_Hyst is that grand diversity threshold lags behind.
IAGW initiates transmission link to TERS and sets up flow process after receiving that transmission link is set up requirement (Transport Link Setup Required) message.After affirmation was finished in the transmission link foundation of receiving the TERS feedback, IAGW adopted two broadcast mode diversity transmission downlink datas to SERS and TERS.Switch and finish transfer of data flow process afterwards as shown in Figure 5.
After IAGW receives that the transmission link of TERS is set up affirmation, send transmission link foundation to SERS and finish (Transport Link Setup Complete) message, notice SERS triggers soft handover execution flow process.Thereby SERS this moment can be not immediately to UE send activating set updating message with TERS in newly-built transmission link add the Active Set of UE, but latency period T2.If in time interval T2, difference between current area signal strength signal intensity and Target cell signal strength signal intensity continues the difference smaller or equal to handoff threshold value and handoff threshold lagged value, SERS just triggers the soft handover implementation, send activating set updating message to UE, notice UE adds its Active Set with transmission link newly-built among the TERS.At this moment, because SERS has received the affirmation to first pair multicast data frame that UE sends, so the data in the last PDCP buffering area of TERS will comprise all unacknowledged data in the SERS buffering area.Like this, even the Radio Link between SERS and UE hinders and chain rupture for some reason,, also can not produce the phenomenon of obliterated data because the PDCP buffering area in TERS and the SERS has been in synchronous regime.
Below, in conjunction with embodiment shown in Figure 6 the improved soft handover method of the present invention is described.
In step 1, UE periodically sends the measurement report of the signal quality of cell-of-origin and neighbor cell to SERS.
In step 2, collect measurement data after, SERS needs switch to TERS according to predetermined switching condition judgement UE.Because in evolution architecture, no Iur interface can't exchange data between SERS and TERS.SERS sends TL Setup Required message to IAGW, triggers handoff procedure.
In step 3, after IAGW receives that transmission link is set up requirement (TL Setup Required) message, send transmission link and set up request (TL Setup Request) message to TERS, request TERS is the required resource of UE preassignment.
In step 4, after TERS receives TL Setup Request message, start relevant resource allocator, set up Radio Resource control (RRC) connection, RAB (RAB).TERS sets up packet data polymerized agreement/Radio Link control/medium access control (PDCP/RLC/MAC) entity, sets up new Radio Link, and is enabled in transmission and reception on the new Radio Link.Simultaneously, startup is set up the GTP-U tunnel (GTP-U Tunnels for PS RABs) that is used for packet switching RAB and is come transmission bearer, sets up the user plane bearer between TERS and the IAGW.After all essential resources become the distribution of work, target ERS will send transmission link and set up response (TL Setup Response) message to IAGW, confirm the resource allocation success.
In step 5, after receiving TL Setup Response message, the data that IAGW will mail to SERS are duplicated portion, issue TERS by the GTP-U passage between newly-established and TERS.Simultaneously, IAGW sends transmission link foundation and finishes (TL Setup Complete) message to source ERS, and notification source ERS triggers the implementation of soft handover.
In step 6, receive TL Setup Complete message after, source ERS does not initiate soft handover immediately and carries out flow process, but latency period T2.If in time interval T2, the difference between current area signal strength signal intensity and Target cell signal strength signal intensity continues the difference smaller or equal to handoff threshold value and handoff threshold lagged value, and then source ERS stops the soft handover set-up procedure.And SERS sends activating set updating (ActiveSet Update) message to UE, and the notice UE Radio Link that TERS is newly-built adds its Active Set.
In step 7, receive Active Set Update message after, the information that UE will provide according to this message is reshuffled interface-free resources, and new Radio Link is added Active Set.After UE successfully inserts Target cell, will send activating set updating and finish (Active Set Update Complete) message, notice SERS handover success.At this moment, UE receives the data from SERS and TERS simultaneously.In this scheme, the diversity feature of data flow is finished in IAGW, so time delay is bigger between the two paths of data that UE received.Therefore, for the data flow merging of UE this locality, adopt usually and select than merging.
In this flow process, if in the monitoring period T2 of SERS, difference between current area signal strength signal intensity and the Target cell signal strength signal intensity does not satisfy the difference that continues smaller or equal to handoff threshold value and handoff threshold lagged value, then SERS does not notify UE to upgrade its Active Set, and initiates transmission link release flow process by IAGW to TERS.
Now, with reference to Fig. 7 the equipment that is used for carrying out double playing switching method of the present invention is described.This equipment is positioned on the ERS, comprises the first switching condition judgment means, switching prepare control device, the second switching condition judgment means and switch carrying out control device.
The first switching condition judgment means is used for judging whether that according to first switching condition needs trigger the switching set-up procedure.In the above-described embodiments first switching condition is redefined for, in time interval T1, UE is in the measurement data that SERS reports, and the difference between current area signal strength signal intensity and Target cell signal strength signal intensity continues the difference smaller or equal to handoff threshold value and handoff threshold lagged value.The first switching condition judgment means reads the current measurement data of collecting of SERS, judges according to this first predetermined switching condition whether needs switch to TERS UE.
Switching the prepare control device is used for controlling the switching set-up procedure according to the judged result of first switching condition judgment means output.If the judged result of receiving from the first switching condition judgment means is to switch, then switches the prepare control device and initiate to switch set-up procedure, and manage the set-up procedure in the whole soft handoff procedure.If judged result is need not switch, then switch the judged result of prepare control device cycle detection first switching condition judgment means output.
The second switching condition judgment means is used for judging whether that according to second switching condition needs trigger hand-off execution process.In the above-described embodiments second switching condition is redefined for, in the monitoring period T2 of SERS, the difference between current area signal strength signal intensity and the Target cell signal strength signal intensity does not satisfy the difference that continues smaller or equal to handoff threshold value and handoff threshold lagged value.After second switching condition judgment means acquisition source ERS receives the notice of TL Setup Complete message, read the current measurement data of collecting of SERS, judge whether that according to this second predetermined switching condition needs trigger hand-off execution process.
Here, the first switching condition judgment means further comprises the first switching condition setting device, being used for first switching condition is set to UE and meets the switching judging algorithm to the measured value that SERS periodically reports in the time period all the time at T1, the second switching condition judgment means further comprises the second switching condition setting device, is used for second switching condition and is set to UE and meets the switching judging algorithm to the measured value that SERS periodically reports in the time period all the time at T2.
Switching the execution control device is used for controlling hand-off execution process according to the judged result of second switching condition judgment means output.If the judged result of receiving from the first switching condition judgment means is to need to trigger hand-off execution process, then to switch and carry out control device and stop the soft handover set-up procedure, beginning soft handover implementation is also managed implementation in the whole soft handoff procedure.If judged result is need not trigger hand-off execution process, then switches the prepare control device and initiate transmission link release flow process to TERS by IAGW.
The technical solutions according to the invention cardinal principle is, the set-up procedure of switching is in advance avoided the unexpected SERS that causes that changes of the quality of eating dishes without rice or wine that occurs between SERS and UE to fall chain, and then avoided occurring the situation of loss of data.
The soft handoff scheme that the present invention proposes also has other implementations, for example, a switching preparation threshold and a handover trigger thresholding is set.When the signal strength signal intensity of eating dishes without rice or wine between TERS and UE arrives switching preparation threshold, start and switch set-up procedure; When the signal strength signal intensity of eating dishes without rice or wine between TERS and UE arrives switching execution thresholding, start hand-off execution process.Like this, also can reach the purpose of switching in advance.
Under the situation that adopts this mode, the above-mentioned first switching condition judgment means further comprises the first switching condition setting device, is used for that first switching condition is set to the TERS that reported and the signal strength measurement of eating dishes without rice or wine between the UE reaches the switching preparation threshold value; The above-mentioned second switching condition judgment means further comprises the second switching condition setting device, is used for second switching condition and is set to the TERS that reported and the signal strength measurement of eating dishes without rice or wine between the UE and reaches to switch and carry out threshold value.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1, the double playing switching method under a kind of two-layer node network architecture, described two-layer node comprises wireless base station, edge (ERS) and IP IAD (IAGW), wherein, wireless base station, edge (ERS) is divided into wireless base station, edge, source (SERS) and object edge wireless base station (TERS) in handoff procedure, the method comprising the steps of:
A, determine that according to first switching condition subscriber equipment (UE) needs when object edge wireless base station (TERS) switches, initiate the switching set-up procedure when wireless base station, edge, source (SERS);
B, IP IAD (IAGW) begins to adopt two broadcast modes respectively after wireless base station, edge, source (SERS) and object edge wireless base station (TERS) issue data in switching set-up procedure, when wireless base station, edge, source (SERS) determines that according to second switching condition needs are initiated hand-off execution process, stop switching set-up procedure and initiating hand-off execution process.
2, the method for claim 1 is characterized in that first switching condition in the described steps A is, in very first time section, subscriber equipment (UE) meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports.
3, the method for claim 1 is characterized in that second switching condition among the described step B is, in second time period, subscriber equipment (UE) meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports.
4, as claim 2 or 3 described methods, it is characterized in that described switching judging algorithm is, the difference between cell-of-origin signal strength measurement and the Target cell signal strength measurement is less than or equal to the difference of handoff threshold value and handoff threshold lagged value.
5,, it is characterized in that these two durations of the very first time section and second time period come definite according to RRM RRM algorithm and site environment actual measurement as claim 2 or 3 described methods.
6, the method for claim 1 is characterized in that the switching set-up procedure in the described steps A further comprises:
IP IAD (IAGW) is initiated transmission link to object edge wireless base station (TERS) and is set up process after receiving that the message of set-up procedure is switched in the triggering of sending wireless base station, edge, source (SERS);
After IP IAD (IAGW) receives that the transmission link of object edge wireless base station (TERS) feedback is set up successful message, adopt two broadcast modes to send downlink data to wireless base station, edge, source (SERS) and object edge wireless base station (TERS), send the message that triggers hand-off execution process to wireless base station, edge, source (SERS) simultaneously.
7, method as claimed in claim 6 is characterized in that described step B further comprises:
After receiving the message of the triggering hand-off execution process that IP IAD (IAGW) is sent, the measured value that wireless base station, edge, source (SERS) utilizes subscriber equipment (UE) to report judges whether to satisfy second switching condition,
If satisfy, then wireless base station, edge, source (SERS) stops switching set-up procedure, and notifying user equipment (UE) adds its Active Set with the described transmission link that object edge wireless base station (TERS) sets up.
8, method as claimed in claim 7, it is characterized in that described step B also comprises: if do not satisfy second switching condition, then wireless base station, edge, source (SERS) initiates the transmission link dispose procedure by IP IAD (IAGW) to object edge wireless base station (TERS).
9, the method for claim 1 is characterized in that first switching condition in the described steps A is, object edge wireless base station (TERS) that is reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) reach the switching preparation threshold value.
10, the method for claim 1 is characterized in that second switching condition among the described step B is, object edge wireless base station (TERS) that is reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) reach to switch carries out threshold value.
11, two under a kind of two-layer node network architecture broadcast switching device, and described two-layer node comprises wireless base station, edge (ERS) and IP IAD (IAGW), and described equipment is positioned on the wireless base station, edge (ERS), it is characterized in that this equipment comprises:
The first switching condition judgment means is used for judging whether that according to first switching condition needs trigger the switching set-up procedure;
Switch the prepare control device, be used for controlling the switching set-up procedure according to the judged result of first switching condition judgment means output;
The second switching condition judgment means is used for judging whether that according to second switching condition needs trigger hand-off execution process;
Switch and carry out control device, be used for controlling hand-off execution process according to the judged result of second switching condition judgment means output.
12, equipment as claimed in claim 11, it is characterized in that the described first switching condition judgment means further comprises: the first switching condition setting device is used for first switching condition and is set to subscriber equipment (UE) and meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports in very first time section.
13, equipment as claimed in claim 11, it is characterized in that the described second switching condition judgment means further comprises: the second switching condition setting device is used for second switching condition and is set to subscriber equipment (UE) and meets the switching judging algorithm all the time to the measured value that wireless base station, edge, source (SERS) periodically reports in second time period.
14, equipment as claimed in claim 11, it is characterized in that the described first switching condition judgment means further comprises: the first switching condition setting device is used for that first switching condition is set to the object edge wireless base station (TERS) that reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) reaches the switching preparation threshold value.
15, equipment as claimed in claim 11, it is characterized in that the described second switching condition judgment means further comprises: the second switching condition setting device is used for second switching condition and is set to the object edge wireless base station (TERS) that reported and the signal strength measurement of eating dishes without rice or wine between the subscriber equipment (UE) and reaches to switch and carry out threshold value.
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2005
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| WO2011082522A1 (en) * | 2010-01-06 | 2011-07-14 | 上海贝尔股份有限公司 | Method and device for service switching in wireless relay network |
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| CN113329462A (en) * | 2014-12-17 | 2021-08-31 | 高通股份有限公司 | Method and apparatus for dual active connection handover |
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| CN107454638A (en) * | 2017-08-02 | 2017-12-08 | 杭州迪普科技股份有限公司 | The sending method and device of message, computer-readable recording medium |
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