CN104521252A - UMTS-to-LTE network handover method, device and system - Google Patents

UMTS-to-LTE network handover method, device and system Download PDF

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Publication number
CN104521252A
CN104521252A CN201380001574.4A CN201380001574A CN104521252A CN 104521252 A CN104521252 A CN 104521252A CN 201380001574 A CN201380001574 A CN 201380001574A CN 104521252 A CN104521252 A CN 104521252A
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measurement
propagation delay
umts
time
rnc
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CN104521252B (en
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宋平
张欢
邢平平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Embodiments of the present invention provide a UMTS-to-LTE network handover method, device and system. In a co-site scene, a handover command transmitted from a source RNC to UE includes an indication that an RACH process in a target cell is not needed, an uplink resource of a handover complete message transmitted by the UE is pre-allocated in advance, the value of TA is determined by the source RNC in advance, the handover command carrying the indication, the uplink resource and the TA value are transmitted to the UE, and the UE can directly access to the target cell after receiving the handover command without performing the RACH process in the target cell, so that interrupt delay caused by the RACH process is shortened, and the related resources of the RACH are also saved.

Description

UMTS-to-LTE network handover method, device and system
A kind of UMTS to LTE method for switching network, equipment and systems technology field
The present invention relates to mobile communications network field, more particularly to a kind of universal mobile telecommunications service（UMTS Long Term Evolution) is arrived（LTE method for switching network, equipment and system).Background technology
Multiple types e-learning quality brings deployment and managerial difficulty to operator, such as from the perspective of 3GPP, WCDMA is arrived from global system for mobile communications (Global System for Mobile, Communications, GSM)（Wideband Code Division Multiple Access, WCDMA) Long Term Evolution is arrived again（Long Term Evolution, LTE), one operator will run three simultaneously and throw the net network, how to be managed and safeguard, the relation of network and network each other how, which type of business is resided in where throws the net on network, variety of problems has to be solved.In this case, single access network (Single Radio Access Network, SingleRAN) is arisen at the historic moment.Single RAN are optimized by unified R＆M management, unified RRM, unified network planning system, unified transmission resource management, to support the fusion and evolution of different technologies standard.Implement i.e. by the way of the access network node of multiple types is concentrated in together, i.e. Multi-Mode Base Station, eNB (evolved NodeB) and NB and base transceiver station（Base Transceiver Station, BTS) co-sited.
In Single RAN universal mobile telecommunications service (Universal Mobile Telecommunications System, UMTS) coexisted with LTE under scene, in the common overlay areas of UMTS and LTE, there is the switching based on covering or load between UMTS and LTE, wherein UMTS to LTE network handover routines are as shown in figure 1, including following several steps：
(1) user equipment (User Equipment, UE) reports isosystem measurement to report to source radio network controller in UMTS serving cells（Radio Network Controller, RNC )；
(2) source RNC sends handover request by UMTS and LTE core network node to target eNB；(3) target eNB, which is received, carries out related resource preparation and by LTE and UMTS cores after handover request Heart net node sends handover request ack message to source RNC；
(4) source RNC sends switching command to UE；
(5) resource allocations of the UE in switching command initiates Stochastic accessing to target LTE cells；(6) UE is successfully accessed after target LTE cells, to target eNB send handoff completion message, then carry out again core network by renewal.
Due in LTE system, different UE upward signal wants time unifying when reaching eNodeB, to ensure the orthogonality of upward signal between UE, so as to help to eliminate the interference in cell.Signal has delay in space propagation, if UE is moved during calling to the direction away from base station, the signal then sent from base station incites somebody to action the arrival UE of " increasingly later ", at the same time, UE signal also can " increasingly later " arrival base station, signals of the long UE that base station can be caused to receive of delay on this time slot and the time slot that next other UE signals are received in base station are overlapped, cause intersymbol interference.The time unifying of uplink is by UE sending sides application time lead in LTE systems（Timing Advance, TA) come what is realized, TA main function is that, in order to eliminate different propagation delay times between UE, UE adjusts the transmission time according to TA when carrying out up transmission.
Main RACH (the Radom Access Channel received from UE after switching command in LTE of time delay of current UMTS to LTE (abbreviation U-L) switching, RACH obtained during), the RACH processes are primarily to obtain Timing Advance（Timing advance, TA) and subsequent upstream send handoff completion message resource.
Because RACH processes are initiated after UE receives switching command, above-mentioned RACH processes can increase U-L handoff time delay to a certain extent, simultaneously because the RACH processes UE in handoff procedure uses special Preamble codes resource, that is target eNB also needs to mark off special Preamble codes resource for UE handoff procedure, occupies certain private code resource.The content of the invention
The embodiments of the invention provide a kind of UMTS to LTE method for switching network, equipment and system, in UMTS to LTE network switching process, to shorten UMTS to LTE handoff time delay, and LTE private code resources are saved. In a first aspect, the embodiments of the invention provide a kind of universal mobile telecommunications service UMTS to Long Term Evolution LTE method for switching network, including：
The measurement report for including same station LTE adjacent areas that service wireless network controller RNC in source is sent according to user equipment (UE) in UMTS is made to after the switch decision of target LTE cells, and handover request message is sent to target BS eNB；
It is the ascending resource information to send handoff completion message that the UE is distributed that the source RNC, which is received and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message,；
The source RNC to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access.
With reference in a first aspect, in the first possible embodiment, the TA information is that the source RNC is obtained by following manner：
The source RNC by the UE in UMTS cells when by RACH Procedure Acquisitions to UE to base station NB propagation delay time be converted to the value of the TA.
With reference to the first possible embodiment of first aspect, in second of possible embodiment, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of the source RNC sides when UE is in UMTS cells.
With reference in a first aspect, first and second kind of possible embodiment of first aspect, in the third possible embodiment, the No RACH that are designated as that Target cell need not be gone to carry out RACH processes carried in the switching command are indicated or indicated with station.
With reference in a first aspect, in the 4th kind of possible embodiment, the TA information is that the source RNC is obtained by following manner：
The source RNC is in UE in UMTS cells and when being in dedicated transmission channel DCH states, it is sent to include user's positioning measurement UE positioning measurement in isosystem measurement control Measurement Control message, the measurement control message； The source RNC receives the isosystem measurement report that UE is sent, and UE Rx-Tx time difference value and round trip time or extended round trip time value are obtained from isosystem measurement report；
The value of UE to NB propagation delay time when the source RNC calculates UE in UMTS cells according to following formula, then the value of the propagation delay time calculated is converted into TA value：
UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells;
The UE Rx-Tx time difference are the sign UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；
Round trip time or extended round the trip time receive the time difference at special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times for sign NB.
With reference to the 4th kind of possible embodiment of first aspect, in the 5th kind of possible embodiment, source RNC sends isosystem measurement control message to UE, including：
The source RNC is configured in increased measurement Additional measurement, described Additional measurement in measurement control message and is included UE positioning measurement；The source RNC issues the isosystem measurement control message to UE.
Second aspect, the embodiments of the invention provide a kind of universal mobile telecommunications service UMTS to Long Term Evolution LTE method for switching network, including：
User equipment (UE) is sent comprising the measurement report with station LTE adjacent areas to source radio network controller RNC in UMTS cells;
The UE receives the ascending resource information to send handoff completion message that target BS eNB is carried in the switching command that the source RNC is sent, the switching command and is distributed for the UE, instruction and Timing Advance TA information that Target cell need not be gone to carry out RACH RACH processes；The UE completes to access from source UMTS cells to the switching of target LTE cells according to the instruction of the switching command.
With reference to second aspect, in the first possible embodiment, the TA information is that the source RNC is obtained by following manner： The source RNC by the UE in UMTS cells when by RACH Procedure Acquisitions to UE to NB propagation delay time be converted to the value of the TA.
With reference to the first possible embodiment of second aspect, in second of possible embodiment, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of source RNC sides when the UE is in UMTS cells.
With reference to the first possible embodiment of second aspect, in the third possible embodiment, this method also includes：
The UE receives the measurement control Measurement Control message that source RNC is issued, the reinforcement of the Measurement Control message in UMTS cells and when being in dedicated transmission channel DCH states.Measurement Additional measurement in include user's positioning measurement UE positioning measurement；The UE is just blunt to carry out isosystem measurement according to the Measurement Control message, and is accused to just the blunt isosystem measurement for including UE Rx-Tx time difference and round trip time or extended round trip time is just blunt on the source RNC；
The value of TA in the switching command that the UE is received is obtained by following manner：
The value of UE to NB propagation delay time when the source RNC calculates UE in UMTS cells according to following formula, then the value of the propagation delay time calculated is converted into TA values：
UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells;
The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；
Round trip time or extended round the trip time characterize NB and receive the time difference that special physical controlling channel of upward frame sends downward special physical channel frame with NB.
With reference to second aspect, the one or three kind of possible embodiment of second aspect, the No RACH that are designated as that being carried in the 4th kind of possible embodiment, in the switching command need not go Target cell to carry out RACH processes are indicated or indicated with station.
The third aspect, the embodiments of the invention provide a kind of radio network controller (RNC), positioned at universal mobile telecommunications service UMTS network, including： Switch decision module, includes the measurement report with station Long Term Evolution LTE adjacent areas in the user equipment (UE) for receiving its administration what is sent, makes the UE to the switch decision of target LTE cells；
Sending module, for making the UE to after the switch decision of target LTE cells, handover request message is sent to target BS eNB；And after the handover request ack message that receiving module receives target eNB returns, to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access；
It is the ascending resource information to send handoff completion message that the UE is distributed to carry the target eNB in receiving module, the handover request ack message for receiving target eNB returns, the handover request ack message.
With reference to the third aspect, in the first possible embodiment, the RNC also includes：
TA data obtaining modules, during for by the UE in UMTS cells by RACH Procedure Acquisitions to UE to base station NB propagation delay time be converted to the value of the TA.
With reference to the first possible embodiment of the third aspect, in second of possible embodiment, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of the RNC sides when UE is in UMTS cells.
With reference to the third aspect, first and second kind of possible embodiment of the third aspect, in the third possible embodiment, the No RACH that are designated as that Target cell need not be gone to carry out RACH processes carried in the switching command are indicated or indicated with station.
With reference to the third aspect, in the 4th kind of possible embodiment, the RNC, in addition to：TA data obtaining modules；
The sending module, it is additionally operable in UE in UMTS cells and when being in dedicated transmission channel DCH states, it is sent to include user's positioning measurement UE positioning measurement in isosystem measurement control Measurement Control message, the measurement control message；
The receiving module, is additionally operable to receive the isosystem measurement report that UE is sent；
The TA data obtaining modules, for obtaining UE Rx-Tx time from isosystem measurement report Difference value and round trip time or extended round trip time value；And when calculating UE in UMTS cells according to following formula UE to NB propagation delay time value, then the value of the propagation delay time calculated is converted into TA value：UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells；The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round the trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
With reference to the 4th kind of possible embodiment of the third aspect, in the 5th kind of possible embodiment, the sending module, UE positioning measurement are included specifically for being configured in measurement control message in increased measurement Additional measurement, described Additional measurement；The isosystem measurement control message is issued to UE.
Fourth aspect, the embodiments of the invention provide a kind of radio network controller (RNC), positioned at universal mobile telecommunications service UMTS network, including：
Processor, includes the measurement report with station Long Term Evolution LTE adjacent areas in the user equipment (UE) for receiving its administration what is sent, makes the UE to the switch decision of target LTE cells；
Transceiver, for making the UE to after the switch decision of target LTE cells in processor, handover request message is sent to target BS eNB；It is the ascending resource information to send handoff completion message that the UE is distributed to receive and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message；And after the handover request ack message of target eNB returns is received, to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access.
5th aspect, the embodiments of the invention provide a kind of user equipment (UE), including：
Isosystem measurement module, for arriving source radio network controller RNC to carrying out isosystem measurement with station LTE adjacent areas, and sending isosystem measurement to report in universal mobile telecommunications service UMTS cells;
Receiving module, is carried for receiving in the switching command that the source RNC is sent, the switching command There are the ascending resource information to send handoff completion message that target BS eNB distributes for the UE, instruction and Timing Advance TA information that Target cell need not be gone to carry out RACH RACH processes；
Handover module, for the instruction according to the switching command, completes to access from source UMTS cells to the switching of target LTE cells.
With reference to the 5th aspect, in the first possible embodiment, the receiving module, is additionally operable to, when the UE is in UMTS cells and when being in dedicated transmission channel DCH states, receive the measurement control Measurement Control message that source RNC is issued；User's positioning measurement UE positioning measurement are included in measurement Additional measurement of the reinforcement mouthful of the Measurement Control message；
The isosystem measurement module, it is additionally operable to carry out isosystem measurement according to the Measurement Control message, and is accused to just the blunt isosystem measurement for including UE Rx-Tx time difference and round trip time or extended round trip time is just blunt on the source RNC；The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round the trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
With reference to the 5th aspect, the first possible embodiment of the 5th aspect, the No RACH that are designated as that being carried in second of possible embodiment, in the switching command need not go Target cell to carry out RACH processes are indicated or indicated with station.
6th aspect, the embodiments of the invention provide a kind of user equipment (UE), including：
Processor, source radio network controller RNC is arrived for carrying out isosystem measurement to same station LTE adjacent areas in universal mobile telecommunications service UMTS cells, and sending blunt accuse of isosystem measurement 4;And according to the instruction of the switching command, complete to access from source UMTS cells to the switching of target LTE cells；
Transceiver, for receiving the ascending resource information to send handoff completion message that target BS eNB is carried in the switching command that the source RNC is sent, the switching command and is distributed for the UE, instruction and the Timing Advance TA information that Target cell need not be gone to carry out RACH RACH processes. 7th aspect, the embodiments of the invention provide a kind of universal mobile telecommunications service UMTS to Long Term Evolution LTE network switching system, including：
Radio network controller (RNC), in UMTS, the measurement report for including same station LTE adjacent areas for being sent according to user equipment (UE) is made to after the switch decision of target LTE cells, and handover request message is sent to target BS eNB；It is the ascending resource information to send handoff completion message that the UE is distributed to receive and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message；Instruction and the Timing Advance TA information that sent to the UE and the ascending resource information is carried in switching command, the switching command, Target cell need not be gone to carry out RACH RACH processes；
UE, for sending comprising the measurement report with station LTE adjacent areas to the RNC, and receives the switching command that the source RNC is sent, and according to the instruction of the switching command, completes to access from source UMTS cells to the switching of target LTE cells.
The beneficial effect of the embodiment of the present invention includes：
Above-mentioned UMTS to LTE provided in an embodiment of the present invention method for switching network, equipment and system, under the scene of co-sited, the instruction that Target cell need not be gone to carry out RACH processes is contained in the switching command that source RNC is issued to UE, and, the ascending resource of handoff completion message is sent due to having pre-allocated UE in advance, and TA value is defined by source RNC in advance, this three contents are all carried UE is handed down in switching command, UE can be after switching command be received, directly accessed to Target cell, without carrying out RACH processes in Target cell, shorten due to the interruption time delay that RACH processes are brought, RACH related resource is also saved simultaneously.Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, the accompanying drawing used required in being described below to embodiment is briefly introduced, apparently, drawings in the following description are only some embodiments of the present invention, for one of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of UMTS to LTE network handover routines in the prior art； Flow chart of the method for switching network in source RNC sides that Fig. 2 is UMTS to LTE provided in an embodiment of the present invention；
Fig. 3 is round trip time and UE Rx-Tx time difference provided in an embodiment of the present invention graph of a relation；
Fig. 4 is the flow chart in UE sides of UMTS to LTE provided in an embodiment of the present invention method for switching network；
Fig. 5 is the detail flowchart of embodiment one；
Fig. 6 is the detail flowchart of embodiment two.
Fig. 7 is the first structural representation of radio network controller provided in an embodiment of the present invention；Fig. 8 is second of structural representation of radio network controller provided in an embodiment of the present invention；Fig. 9 is that the third structural representation Figure 10 of radio network controller provided in an embodiment of the present invention is the first structural representation of user equipment provided in an embodiment of the present invention；
Figure 11 is second of structural representation of user equipment provided in an embodiment of the present invention；
Figure 12 is the structural representation of UMTS to LTE provided in an embodiment of the present invention network switching system.Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, it is clear that described embodiment is only embodiment of the invention a part of, rather than whole embodiments.Based on the embodiment in the present invention, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
With reference to Figure of description, the embodiment to a kind of UMTS to LTE method for switching network provided in an embodiment of the present invention, equipment and system is illustrated.
The flow of UE Serving RNC (hereinafter referred to as source RNC) side is as shown in Fig. 2 comprise the following steps in a kind of UMTS to LTE provided in an embodiment of the present invention method for switching network, UMTS：
The measurement report included with station LTE adjacent areas that source Serving RNC is sent according to UE in S201, UMTS Announcement is made to after the switch decision of target LTE cells, and handover request message is sent to target eNB；
5202nd, it is the ascending resource information to send handoff completion message that UE is distributed that source RNC, which is received and target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message,；
5203rd, source RNC sends switching command to UE, indicate UE according to the ascending resource information that is carried in switching command, need not go that Target cell carries out the instruction of RACH processes and TA information completes the switching from UMTS to LTE.
By said process, UE can be after the switching command of source RNC transmissions be received, Target cell can be directly arrived using the relevant information carried in switching command to be accessed, RACH processes, which need not be performed, can get ascending resource information and TA information, compared with prior art, the RACH processes performed after switching command in LTE are being connected to due to eliminating UE, the network switching for shortening UMTS to LTE interrupts time delay, while having saved special Preamble codes resource.
In the above method provided in an embodiment of the present invention, UE subsequently sends ascending resource used in handoff completion message, it can in advance be distributed by target eNB and UE is informed by source RNC, for TA value, source RNC can then be obtained by following two ways：
1st, source RNC by UE in UMTS cells when UE to NB propagation delay time（Propagation Delay, PD) carry out being converted to TA value.
When UE is in UMTS cells, source RNC can be parameter by RACH Procedure Acquisitions UE to NB propagation delay time：Propagation delay time（Propagation delay) parameter or extension propagation delay time（Extended propagation delay) parameter, according to protocol definition, its precision is 2chip, that is 0.52us, and the TA of RACH Procedure Acquisitions precision is 0.52us in LTE, therefore the two parameters precisions are on the same order of magnitude, and, in the case of eNB and NB co-sited or shared antenna, UE to eNB is identical with UE to NB distance, there is identical signal propagation delay time, therefore, in this case when UE is switched to LTE cells from UMTS cells, UE can use the TA that propagation delay or Extended the propagation delay parameters in UMTS are obtained after being changed and be adjusted to carry out the first time uplink transmission time of Target cell.
2nd, source RNC can west oneself put ^] close;Then amount obtains J round trip time and extended round trip Time is (optional）, UE to NB propagation delay time when source RNC first can calculate UE in UMTS cells according to following formula（Hereinafter referred to as PD) value, then the PD values are converted into TA values：
PD=(round trip time or extended round trip time-UE Rx-Tx time difference)/2.
In above formula, UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
Round trip time and extended round trip time (optional) parameter representation signal returns again to NB propagation delay time from NB to UE, and precision is that 0.5chip is 0.13us.Meanwhile, it is parameter UE Rx-Tx time difference that UE, which exist between up transmission and downlink reception a time difference, and its precision is 0.39us for 1.5chip.The time relationship of the two parameters is as shown in Figure 3, as can be seen from Figure 3, (round trip time or extended round trip time-UE Rx-Tx time differenced/2 are approximately equal to the propagation delay time PD between NB to UE, the TA obtained after PD is changed, the propagation delay time precision obtained using the method can be utilized directly with TA on the same order of magnitude.
Because PD is different with TA unit, PD is carried out to the conversion of unit, corresponding TA value can be obtained, specific transfer process belongs to the category of prior art, will not be repeated here.
UMTS to LTE provided in an embodiment of the present invention method for switching network, for the flow of UE sides, as shown in figure 4, comprising the steps：
S401, UE are sent comprising the measurement report with station LTE adjacent areas to source RNC in UMTS cells;
5402nd, UE receives the ascending resource information to send handoff completion message that target eNB is carried in the switching command that source RNC is sent, switching command and is distributed for the UE, instruction and TA information that Target cell need not be gone to carry out RACH processes；
5403rd, UE completes the switching from UMTS to LTE according to the instruction of the switching command.The acquisition modes of the acquisition modes of TA value and ascending resource information as hereinbefore, will not be repeated here in TA information in above-mentioned flow.
In order to which UMTS to LTE provided in an embodiment of the present invention method for switching network is better described, below Illustrated with two specific embodiments.
Embodiment one：
The flow of the present embodiment one is as shown in figure 5, comprise the following steps：
5501st, UE is sent comprising the measurement report with station LTE adjacent areas to source RNC in UMTS serving cells;
5502nd, source RNC makes the switch decision to target LTE cells, sends handover request message and gives target eNB;
S503, target eNB carry out access and related resource prepares, and send handover request ack message and give source RNC;Handover request ack message includes the ascending resource information to send handoff completion message distributed to UE；
S504, source RNC are sent in switching command, the switching command in addition to conventional content to UE, in addition to the description below：
A) the ascending resource information in handover request ack message；
B) instruction that UE need not go Target cell to carry out RACH processes is informed；The instruction for example can be that No RACH are indicated or indicated with station；
C) TA information, TA value passes through the propagation delay or Extended in UMTS system
The ascending resource information of S505, UE in switching command, directly sends handoff completion message to target eNB；Other steps are identical with normal UMTS to LTE network switching process.
Embodiment two：
The flow of the present embodiment two is as shown in fig. 6, comprise the following steps：
S601, in the case of eNB and NB co-sited, source RNC is in DCH states（UE a kind of state under connection mode, with dedicated transmission channel（Dedicated Transport Channels, D CH) name) UE when configuring isosystem measurement, carry out increased measurement（Additional meas urement) item configuration, additional measurement includes user's positioning measurement (UE po sitioning measurement) item；
Specifically, in this S601, source RNC can be controlled in the measurement for being handed down to UE Additional measurement is configured in (Measurement Control) message, UE positioning measurement are included in Additional measurement, the measurement control message is handed down to after UE, UE can carry out round trip time and UE Rx-Tx time difference measurement.
S602, UE are sent comprising the measurement report with station LTE adjacent areas to source RNC in UMTS serving cells;
S603, source RNC make the switch decision to target LTE cells according to comprising the measurement report with station LTE adjacent areas, send handover request message and give target eNB;
S604, target eNB carry out access and related resource prepares, and send handover request ack message and give source RNC;Handover request ack message includes the ascending resource information to send handoff completion message distributed to UE；
It is (optional comprising round trip time and extended round trip time that S605, source RNC obtain J）The blunt announcement of measurement ability with UE Rx-Tx time difference, PD is calculated according to formula PD=(round trip time or extended round trip time-UE Rx-Tx time difference)/2, then TA values are extrapolated into PD progress conversions.
S606, source RNC are sent in switching command, the switching command in addition to conventional content to UE, in addition to the description below：
A) the ascending resource information in handover request ack message；
B) instruction that UE need not go Target cell to carry out RACH processes is informed；The instruction can be that No RACH are indicated or indicated with station；
C) TA information, its value calculates to obtain in foregoing S604 according to round trip time and extended round trip time (optional) and UE Rx-Tx time difference；
The ascending resource information of S607, UE in switching command, directly sends handoff completion message to target eNB；Other steps are identical with normal UMTS to LTE network switching process.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of radio network controller, user equipment and UMTS to LTE network switching system, by the principle that these equipment and system solve problem is similar to foregoing UMTS to LTE method for switching network, therefore the implementation of these equipment and system may refer to the implementation of preceding method, repeats part and repeats no more. Radio network controller provided in an embodiment of the present invention, as shown in fig. 7, comprises：
Switch decision module 701, includes the measurement report with station Long Term Evolution LTE adjacent areas in the user equipment (UE) for receiving its administration what is sent, makes the UE to the switch decision of target LTE cells；Sending module 702, for making the UE to after the switch decision of target LTE cells, handover request message is sent to target BS eNB；And after the handover request ack message that receiving module 703 receives target eNB returns, to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access；
It is the ascending resource information to send handoff completion message that the UE is distributed to carry the target eNB in receiving module 703, the handover request ack message for receiving target eNB returns, the handover request ack message.
Further, in the first possible embodiment of radio network controller provided in an embodiment of the present invention, as shown in fig. 7, can also include：TA data obtaining modules 704, during for by the UE in UMTS cells by RACH Procedure Acquisitions to UE to base station NB propagation delay time be converted to the value of the TA.
Further, in the first possible embodiment of above-mentioned radio network controller, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of the RNC sides when above-mentioned UE is in UMTS cells.
Further, in the first possible embodiment of above-mentioned radio network controller, the No RACH that are designated as that Target cell need not be gone to carry out RACH processes carried in switching command are indicated or indicated with station.
Further, in second of radio network controller provided in an embodiment of the present invention possible embodiment, as shown in figure 8, can also include：TA data obtaining modules 704;
Correspondingly, sending module 702, it is additionally operable in UE in UMTS cells and when being in dedicated transmission channel DCH states, it is sent to include user's positioning measurement UE positioning measurement in isosystem measurement control Measurement Control message, the measurement control message； Receiving module 703, is additionally operable to receive the isosystem measurement report that UE is sent；
Τ Α data obtaining modules 704, for obtaining UE Rx-Tx time difference value and round trip time or extended round trip time value from isosystem measurement report；And when calculating UE in UMTS cells according to following formula UE to NB propagation delay time value, then the value of the propagation delay time calculated is converted into TA value：UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells；The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round the trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
In second of possible embodiment of radio network controller provided in an embodiment of the present invention, sending module 702, UE positioning measurement are included specifically for being configured in measurement control message in increased measurement Additional measurement, described Additional measurement；The isosystem measurement control message is issued to UE.
In the third possible embodiment of radio network controller provided in an embodiment of the present invention, as shown in Fig. 9, the radio network controller includes：
Processor 901, includes the measurement report with station Long Term Evolution LTE adjacent areas in the user equipment (UE) for receiving its administration what is sent, makes the UE to the switch decision of target LTE cells；
Transceiver 902, for making the UE to after the switch decision of target LTE cells in processor 901, handover request message is sent to target BS eNB；It is the ascending resource information to send handoff completion message that the UE is distributed to receive and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message；And after the handover request ack message of target eNB returns is received, to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access.
UE provided in an embodiment of the present invention the first embodiment, as shown in Figure 10, including：Isosystem measurement module 1001, for being stood in universal mobile telecommunications service UMTS cells to same LTE adjacent areas carry out isosystem measurement, and send isosystem measurement report to source radio network controller RNC;Receiving module 1002, target BS is carried for receiving in the switching command that the source RNC is sent, the switching commandeNB is the ascending resource information to send handoff completion message that the UE is distributed, instruction and Timing Advance TA information that Target cell need not be gone to carry out RACH RACH processes；
Handover module 1003, for the instruction according to the switching command, completes to access from source UMTS cells to the switching of target LTE cells.
Further, in the first possible embodiment of above-mentioned user equipment, receiving module 1003, is additionally operable to, when the UE is in UMTS cells and when being in dedicated transmission channel DCH states, receive the measurement control Measurement Control message that source RNC is issued；User's positioning measurement UE positioning measurement are included in increased measurement Additional measurement of the Measurement Control message；
Above-mentioned isosystem measurement module 1001, it is additionally operable to carry out isosystem measurement according to the Measurement Control message, and is accused to just the blunt isosystem measurement for including UE Rx-Tx time difference and round trip time or extended round trip time is just blunt on the source RNC；The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round the trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
Further, the No RACH that are designated as that being carried in the first possible embodiment of above-mentioned user equipment, in switching command need not go Target cell to carry out RACH processes are indicated or indicated with station.
UE provided in an embodiment of the present invention second of embodiment, as shown in figure 11, including：Processor 1101, for arriving source radio network controller RNC to carrying out isosystem measurement with station LTE adjacent areas, and sending isosystem measurement to report in universal mobile telecommunications service UMTS cells;And according to the instruction of the switching command, complete to access from source UMTS cells to the switching of target LTE cells；Transceiver 1102, the ascending resource information to send handoff completion message that target BS eNB is carried in the switching command that the source RNC is sent, the switching command and is distributed for the UE for receiving, Target cell need not be gone to carry out instruction and the Timing Advance TA information of RACH RACH processes.
A kind of UMTS to LTE provided in an embodiment of the present invention network switching system, as shown in figure 12, including：
Radio network controller（RNC) 1201, in UMTS, the measurement report for including same station LTE adjacent areas for being sent according to user equipment (UE) 1202 is made to after the switch decision of target LTE cells, and handover request message is sent to target BS eNB；It is the ascending resource information to send handoff completion message that the UE 1202 is distributed to receive and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message；Instruction and the Timing Advance TA information that sent to the UE 1202 and the ascending resource information is carried in switching command, the switching command, Target cell need not be gone to carry out RACH RACH processes；
UE1202, for sending comprising the measurement report with station LTE adjacent areas to the RNC 1201, and the switching command that the source RNC is sent is received, and according to the instruction of the switching command, complete to access from source UMTS cells to the switching of target LTE cells.
Above-mentioned UMTS to LTE provided in an embodiment of the present invention method for switching network, equipment and system, under the scene of co-sited, the instruction that Target cell need not be gone to carry out RACH processes is contained in the switching command that source RNC is issued to UE, and, the ascending resource of handoff completion message is sent due to having pre-allocated UE in advance, and TA value is defined by source RNC in advance, this three contents are all carried UE is handed down in switching command, UE can be after switching command be received, directly accessed to Target cell, without carrying out RACH processes in Target cell, shorten the interruption time delay that RACH processes are brought, RACH related resource is also saved simultaneously.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program product.Therefore, the form of the embodiment in terms of the present invention can use complete hardware embodiment, complete software embodiment or combine software and hardware.Moreover, the present invention can be used (includes but is not limited to magnetic disk storage, CD-ROM, optical memory etc. in one or more computer-usable storage mediums for wherein including computer usable program code）The form of the computer program product of upper implementation.
The present invention is with reference to method according to embodiments of the present invention, equipment（System）And computer program production The flow chart and/or block diagram of product is described.It should be understood that can by the flow in each flow and/or square frame and flow chart and/or block diagram in computer program instructions implementation process figure and/or block diagram and/or square frame combination.These computer program instructions can be provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices to produce a machine so that produce the device for being used for realizing the function of specifying in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames by the instruction of the computing device of computer or other programmable data processing devices.
These computer program instructions may be alternatively stored in the computer-readable memory that computer or other programmable data processing devices can be guided to work in a specific way, so that the instruction being stored in the computer-readable memory, which is produced, includes the manufacture of command device, the command device realizes the function of being specified in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices, so that series of operation steps is performed on computer or other programmable devices to produce computer implemented processing, so that the instruction performed on computer or other programmable devices provides the step of being used to realize the function of specifying in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creative concept, then other change and modification can be made to these embodiments.So, appended claims are intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.Depart from the spirit and scope of the embodiment of the present invention.So, if these modifications and variations of the embodiment of the present invention belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprising including these changes and modification.

Claims (12)

  1. Claim
    1st, a kind of universal mobile telecommunications service UMTS to Long Term Evolution LTE method for switching network, it is characterised in that including：
    The measurement report for including same station LTE adjacent areas that service wireless network controller RNC in source is sent according to user equipment (UE) in UMTS is made to after the switch decision of target LTE cells, and handover request message is sent to target BS eNB；
    It is the ascending resource information to send handoff completion message that the UE is distributed that the source RNC, which is received and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message,；
    The source RNC to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access.
    2nd, the method as described in claim 1, it is characterised in that the TA information is that the source RNC is obtained by following manner：
    The source RNC by the UE in UMTS cells when by RACH Procedure Acquisitions to UE to base station NB propagation delay time be converted to the value of the TA.
    3rd, method as claimed in claim 2, characterized in that, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of the source RNC sides when UE is in UMTS cells.
    4th, the method as described in claim any one of 1-3, it is characterised in that the No RACH that are designated as that Target cell need not be gone to carry out RACH processes carried in the switching command are indicated or indicated with station.
    5th, the method as described in claim 1, it is characterised in that the TA information is that the source RNC is obtained by following manner：
    The source RNC is in UE in UMTS cells and when being in dedicated transmission channel DCH states, it is sent to include user's positioning measurement UE positioning measurement in isosystem measurement control Measurement Control message, the measurement control message； The source RNC receives the isosystem measurement report that UE is sent, and UE Rx-Tx time difference value and round trip time or extended round trip time value are obtained from isosystem measurement report；
    The value of UE to NB propagation delay time when the source RNC calculates UE in UMTS cells according to following formula, then the value of the propagation delay time calculated is converted into TA value：
    UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells;
    The UE Rx-Tx time difference are the sign UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；
    Round trip time or extended round the trip time receive the time difference at special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times for sign NB.
    6th, method as claimed in claim 5, it is characterised in that source RNC sends isosystem measurement control message to UE, including：
    The source RNC is configured in increased measurement Additional measurement, described Additional measurement in measurement control message and is included UE positioning measurement；The source RNC issues the isosystem measurement control message to UE.
    7th, a kind of universal mobile telecommunications service UMTS to Long Term Evolution LTE method for switching network, it is characterised in that including：
    User equipment (UE) is sent comprising the measurement report with station LTE adjacent areas to source radio network controller RNC in UMTS cells;
    The UE receives the ascending resource information to send handoff completion message that target BS eNB is carried in the switching command that the source RNC is sent, the switching command and is distributed for the UE, instruction and Timing Advance TA information that Target cell need not be gone to carry out RACH RACH processes；The UE completes to access from source UMTS cells to the switching of target LTE cells according to the instruction of the switching command.
    8th, method as claimed in claim 7, it is characterised in that the TA information is that the source RNC is obtained by following manner： The source RNC by the UE in UMTS cells when by RACH Procedure Acquisitions to UE to NB propagation delay time be converted to the value of the TA.
    9th, method as claimed in claim 8, characterized in that, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of source RNC sides when the UE is in UMTS cells.
    10th, method as claimed in claim 7, it is characterised in that also include：The UE is in UMTS cells and when being in dedicated transmission channel DCH states, user's positioning measurement UE positioning measurement are included in the measurement control Measurement Control message that reception source RNC is issued, measurement Additional measurement of the reinforcement mouthful of the Measurement Control message；The UE carries out isosystem measurement according to the Measurement Control message, and to just the blunt isosystem measurement for including UE Rx-Tx time difference and round trip time or extended round trip time is reported on the source RNC；
    The value of TA in the switching command that the UE is received is obtained by following manner：
    The value of UE to NB propagation delay time when the source RNC calculates UE in UMTS cells according to following formula, then the value of the propagation delay time calculated is converted into TA values：
    UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells;
    The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；
    Round trip time or extended round the trip time characterize NB and receive the time difference that special physical controlling channel of upward frame sends downward special physical channel frame with NB.
    11st, the method as described in claim any one of 7-10, it is characterised in that the No RACH that are designated as that being carried in the switching command need not go Target cell to carry out RACH processes are indicated or indicated with station.
    12nd, a kind of radio network controller (RNC), positioned at universal mobile telecommunications service UMTS network, it is characterised in that including：
    Switch decision module, includes the measurement report with station Long Term Evolution LTE adjacent areas in the user equipment (UE) for receiving its administration what is sent, makes the UE to the switch decision of target LTE cells； Sending module, for making the UE to after the switch decision of target LTE cells, handover request message is sent to target BS eNB；And after the handover request ack message that receiving module receives target eNB returns, to the UE send switching command, indicate UE according to the ascending resource information carried in the switching command, need not go Target cell carry out RACH RACH processes instruction and Timing Advance TA information come complete from source UMTS cells to the switching of target LTE cells access；
    It is the ascending resource information to send handoff completion message that the UE is distributed to carry the target eNB in receiving module, the handover request ack message for receiving target eNB returns, the handover request ack message.
    13rd, RNC as claimed in claim 12, it is characterised in that also include：
    TA data obtaining modules, during for by the UE in UMTS cells by RACH Procedure Acquisitions to UE to base station NB propagation delay time be converted to the value of the TA.
    14th, RNC as claimed in claim 13, characterized in that, UE to NB propagation delay time is the propagation delay time Propagation Delay parameters or extension propagation delay time Extended Propagation Delay parameters of the RNC sides when UE is in UMTS cells.
    15th, the RNC as described in claim any one of 12-14, it is characterised in that the No RACH that are designated as that Target cell need not be gone to carry out RACH processes carried in the switching command are indicated or indicated with station.
    16th, RNC as claimed in claim 12, it is characterised in that also include：TA data obtaining modules；
    The sending module, it is additionally operable in UE in UMTS cells and when being in dedicated transmission channel DCH states, it is sent to include user's positioning measurement UE positioning measurement in isosystem measurement control Measurement Control message, the measurement control message；
    The receiving module, is additionally operable to receive the isosystem measurement report that UE is sent；
    The TA data obtaining modules, for obtaining UE Rx-Tx time difference value and round trip time or extended round trip time value from isosystem measurement report；And when calculating UE in UMTS cells according to following formula UE to NB propagation delay time value, then will calculate The value of the propagation delay time is converted into TA value：UE to NB propagation delay time=(round trip time or extended round trip time-UE Rx-Tx time difference)/2 when UE is in UMTS cells；The UE Rx-Tx time difference characterize the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round the trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
    17th, RNC as claimed in claim 16, it is characterized in that, the sending module, UE positioning measurement are included specifically for being configured in measurement control message in increased measurement Additional measurement, described Additional measurement；The isosystem measurement control message is issued to UE.
    18th, a kind of user equipment (UE), it is characterised in that including：
    Isosystem measurement module, for arriving source radio network controller RNC to carrying out isosystem measurement with station LTE adjacent areas, and sending isosystem measurement to report in universal mobile telecommunications service UMTS cells;
    Receiving module, for receiving the ascending resource information to send handoff completion message that target BS eNB is carried in the switching command that the source RNC is sent, the switching command and is distributed for the UE, instruction and the Timing Advance TA information that Target cell need not be gone to carry out RACH RACH processes；
    Handover module, for the instruction according to the switching command, completes to access from source UMTS cells to the switching of target LTE cells.
    19th, UE as claimed in claim 18, it is characterised in that
    The receiving module, is additionally operable to, when the UE is in UMTS cells and when being in dedicated transmission channel DCH states, receive the measurement control Measurement Control message that source RNC is issued；The reinforcement of the Measurement Control message.Measurement Additional measurement in include user's positioning measurement UE positioning measurement；
    The isosystem measurement module, it is additionally operable to carry out isosystem measurement according to the Measurement Control message, and is accused to just the blunt isosystem measurement for including UE Rx-Tx time difference and round trip time or extended round trip time is just blunt on the source RNC；The UE Rx-Tx time Difference characterizes the UE downward special physical channel frame times of reception and the time difference of special physical controlling channel of upward/uplink Dedicated Physical Data channel frame delivery time；Round trip time or extended round the trip time characterize the time difference that NB receives special physical controlling channel of upward frame moment and NB downward special physical channel frame delivery times.
    20th, the UE as described in claim 18 or 19, it is characterised in that the No RACH that are designated as that being carried in the switching command need not go Target cell to carry out RACH processes are indicated or indicated with station.
    21st, a kind of universal mobile telecommunications service UMTS to Long Term Evolution LTE network switching system, it is characterised in that including：
    Radio network controller (RNC), in UMTS, the measurement report for including same station LTE adjacent areas for being sent according to user equipment (UE) is made to after the switch decision of target LTE cells, and handover request message is sent to target BS eNB；It is the ascending resource information to send handoff completion message that the UE is distributed to receive and the target eNB is carried in the handover request ack message that target eNB is returned, the handover request ack message；Instruction and the Timing Advance TA information that sent to the UE and the ascending resource information is carried in switching command, the switching command, Target cell need not be gone to carry out RACH RACH processes；
    UE, for sending comprising the measurement report with station LTE adjacent areas to the RNC, and receives the switching command that the source RNC is sent, and according to the instruction of the switching command, completes to access from source UMTS cells to the switching of target LTE cells.
CN201380001574.4A 2013-08-06 2013-08-06 A kind of method for switching network of UMTS to LTE, equipment and system Active CN104521252B (en)

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