WO2015017977A1

WO2015017977A1 - Umts-to-lte network handover method, device and system

Info

Publication number: WO2015017977A1
Application number: PCT/CN2013/080903
Authority: WO
Inventors: 宋平; 张欢; 邢平平
Original assignee: 华为技术有限公司
Priority date: 2013-08-06
Filing date: 2013-08-06
Publication date: 2015-02-12
Also published as: CN104521252A; CN104521252B

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

Network switching method, device and system for UMTS to LTE

The present invention relates to the field of mobile communication networks, and in particular, to a network switching method, device and system for Universal Mobile Telecommunications Service (UMTS) to Long Term Evolution (LTE). Background technique

Multi-standard network evolution brings operators deployment and management difficulties, such as from the perspective of 3GPP, from Global System for Mobile (GSM) to Wideband Code Division Multiple Access (Wideband Code) Division Multiple Access (WCDMA), and then to Long Term Evolution (LTE), an operator will operate three networks at the same time, how to manage and maintain, how the network and network interact with each other, and what kind of service resides. On which network, various problems remain to be solved. In this case, a single access network (Single Radio Access Network, SingleRAN) came into being. Single RAN supports the convergence and evolution of different technology standards through unified R&M management, unified radio resource management, unified network planning system optimization, and unified transmission resource management. The specific implementation means that the access network nodes of multiple standards are grouped together, that is, the multi-mode base station, the eNB (Evolved NodeB) and the NB, and the Base Transceiver Station (BTS) are co-located.

In the UMTS and LTE co-coverage areas of the Single RAN, there is coverage or load-based handover between UMTS and LTE in the UMTS and LTE co-coverage areas, where UMTS to LTE network switching The process is shown in Figure 1, which includes the following steps:

(1) User Equipment (UE) reports the system measurement report to the source radio network controller (RNC) on the UMTS serving cell;

(2) The source RNC sends a handover request to the target eNB through the UMTS and the LTE core network node; (3) after receiving the handover request, the target eNB performs related resource preparation and passes the LTE and UMTS cores. The heart network node sends a handover request response message to the source RNC;

(4) The source RNC sends a handover command to the UE;

(5) The UE initiates a random access to the target LTE cell according to the resource allocation in the handover command. (6) After the UE successfully accesses the target LTE cell, the UE sends a handover complete message to the target eNB, and then updates the core network route.

In the LTE system, when the uplink signals of different UEs arrive at the eNodeB, time alignment is required to ensure the orthogonality of the uplink signals between the UEs, thereby helping to eliminate interference in the cell. The signal is delayed in spatial transmission. If the UE moves in the direction away from the base station during the call, the signal sent from the base station will arrive at the UE "later and later", and at the same time, the signal of the UE will "go." The later the "reaching base station", the delay is too long, and the signal received by the base station on the time slot overlaps with the time slot in which the base station receives another UE signal, causing inter-symbol interference. The time alignment of the uplink transmission in the LTE system is implemented by applying the Timing Advance (TA) on the transmitting side of the UE. The main function of the TA is to eliminate different transmission delays between the UEs. Adjust the transmission time according to the TA.

The current UMTS to LTE (U-L) handover delay is mainly obtained from the Radom Access Channel (RACH) process in the LTE after receiving the handover command from the UE. The RACH process is mainly for obtaining time. Timing advance (TA) and subsequent uplink transmission of the resource for the handover completion message.

Since the RACH procedure is initiated after the UE receives the handover command, the foregoing RACH procedure may increase the handover interruption delay of the U-L to some extent, and the UE uses the dedicated Preamble code resource due to the RACH procedure in the handover process. The target eNB also needs to allocate a dedicated Preamble code resource for the handover process of the UE, and occupies a certain dedicated code resource. Summary of the invention

The embodiments of the present invention provide a UMTS-to-LTE network handover method, device, and system, which are used to shorten the UMTS-to-LTE handover interruption delay and save LTE-specific code resources in the UMTS-to-LTE network handover process. In a first aspect, an embodiment of the present invention provides a network switching method for a universal mobile communication service UMTS to a long-term evolution LTE, including:

The UMTS medium source service radio network controller RNC sends a handover request message to the target base station eNB after making a handover decision to the target LTE cell according to the measurement report of the co-located LTE neighboring cell sent by the user equipment UE;

The source RNC receives a handover request response message that is returned by the target eNB, where the handover request response message carries uplink resource information that is allocated by the target eNB for the UE to send a handover complete message;

The source RNC sends a handover command to the UE, instructing the UE to complete the uplink resource information carried in the handover command, the indication of the random access channel RACH process without the target cell, and the time advance TA information. Handover access from the source UMTS cell to the target LTE cell.

In conjunction with the first aspect, in a first possible implementation, the TA information is obtained by the source RNC by:

The source RNC converts the transmission delay of the UE to the base station NB acquired by the RACH procedure when the UE is in the UMTS cell to the value of the TA.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the UE to NB transmission delay in the UMTS cell is a transmission delay Propagation Delay of the source RNC side. Parameter or extended transmission delay Extended Propagation Delay parameter.

With reference to the first aspect, the first and second possible implementation manners of the first aspect, in the third possible implementation manner, the indication that the handover command carries the RACH process without going to the target cell is a No RACH indication or Same station indication.

In conjunction with the first aspect, in a fourth possible implementation, the TA information is obtained by the source RNC by:

The source RNC sends a different system measurement control Measurement Control message to the UE when it is in the UMTS cell and is in the dedicated transport channel DCH state, where the measurement control message includes a user positioning measurement UE positioning measurement item; The source RNC receives the inter-system measurement report sent by the UE, and obtains a value of the UE Rx-Tx time difference and a value of a round trip time or an extended round trip time from the different system measurement report;

The source RNC calculates the value of the transmission delay of the UE to the NB when the UE is in the UMTS cell according to the following formula, and converts the calculated value of the transmission delay into a value of TA:

When the UE is in the UMTS cell, the UE to NB has a transmission delay = (round trip time or extended round trip time - UE Rx-Tx time difference)/2;

The UE Rx-Tx time difference is a time difference between a UE downlink dedicated physical channel frame reception time and an uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time;

The round trip time or the extended round trip time is a time difference between the time when the NB receives the uplink dedicated physical control channel frame time and the NB downlink dedicated physical channel frame transmission time.

With the fourth possible implementation of the first aspect, in a fifth possible implementation, the source RNC sends the inter-system measurement control message to the UE, including:

The source RNC configures an additional measurement item in the measurement control message, where the additional measurement item includes the UE positioning measurement item; the source RNC sends the different system measurement control message to the UE.

In a second aspect, an embodiment of the present invention provides a network switching method for a universal mobile communication service UMTS to a long-term evolution LTE, including:

The user equipment UE sends a measurement report including the co-located LTE neighboring cell to the source radio network controller RNC in the UMTS cell;

The UE receives the handover command sent by the source RNC, where the handover command carries the uplink resource information allocated by the target base station eNB for the UE to send the handover complete message, and does not need to go to the target cell to perform the random access channel RACH. The indication of the process and the timing advance TA information; the UE completes the handover access from the source UMTS cell to the target LTE cell according to the indication of the handover command.

With reference to the second aspect, in a first possible implementation manner, the TA information is obtained by the source RNC by: The source RNC converts the transmission delay of the UE to the NB acquired by the RACH procedure when the UE is in the UMTS cell to the value of the TA.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, when the UE is in a UMTS cell, the UE to NB transmission delay is a transmission delay Propagation Delay parameter of the source RNC side or Extended propagation delay Extended Propagation Delay parameter.

In conjunction with the first possible implementation of the second aspect, in a third possible implementation, the method further includes:

The UE receives the measurement control Measurement Control message sent by the source RNC, and the boosting force of the Measurement Control message, when the UE is in the UMTS cell and is in the DCH state of the dedicated transport channel. The measurement additional measurement item includes a user positioning measurement UE positioning measurement item; the UE performs the inter-system measurement according to the Measurement Control message, and includes the UE Rx-Tx time difference and round to the source RNC. Different system measurements of trip time or extended round trip time are reported;

The value of the TA in the handover command received by the UE is obtained by:

The source RNC calculates the value of the transmission delay of the UE to the NB when the UE is in the UMTS cell according to the following formula, and converts the calculated value of the transmission delay into a TA value:

The UE Rx-Tx time difference characterizes a time difference between a UE downlink dedicated physical channel frame reception time and an uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time;

The round trip time or the extended round trip time characterizes the time difference between the NB receiving the uplink dedicated physical control channel frame and the NB transmitting the downlink dedicated physical channel frame.

With reference to the second aspect, the first to the three possible implementation manners of the second aspect, in the fourth possible implementation manner, the indication that the handover command carries the RACH process without going to the target cell is a No RACH indication or the same Station instructions.

In a third aspect, an embodiment of the present invention provides a radio network controller RNC, which is located in a universal mobile communication service UMTS network, and includes: a handover decision module, configured to receive a measurement report of a co-located long-term evolution LTE neighboring cell sent by a user equipment UE under its jurisdiction, and make a handover decision of the UE to a target LTE cell;

a sending module, configured to send a handover request message to the target base station eNB after the handover decision of the UE to the target LTE cell is performed; and send a handover to the UE after the receiving module receives the handover request response message returned by the target eNB And instructing the UE to complete the handover from the source UMTS cell to the target LTE cell according to the uplink resource information carried in the handover command, the indication of the random access channel RACH procedure without the target cell, and the timing advance TA information. Access

And a receiving module, configured to receive a handover request response message that is returned by the target eNB, where the handover request response message carries uplink resource information that is sent by the target eNB to the UE to send a handover complete message.

With reference to the third aspect, in a first possible implementation manner, the RNC further includes:

The TA information obtaining module is configured to convert the transmission delay of the UE to the base station NB obtained by the RACH procedure when the UE is in the UMTS cell, into a value of the TA.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, the UE-to-NB transmission delay in the UMTS cell is the transmission delay Propagation Delay parameter on the RNC side. Or extend the Extended Propagation Delay parameter.

With reference to the third aspect, the first and second possible implementation manners of the third aspect, in the third possible implementation manner, the indication that the handover command carries the RACH process without going to the target cell is a No RACH indication or Same station indication.

With reference to the third aspect, in a fourth possible implementation, the RNC, further includes: a TA information acquiring module;

The sending module is further configured to: when the UE is in the UMTS cell and in the dedicated transport channel DCH state, send a different system measurement control measurement control message to the UE, where the measurement control message includes a user positioning measurement UE positioning measurement item;

The receiving module is further configured to receive a different system measurement report sent by the UE;

The TA information obtaining module is configured to obtain a UE Rx-Tx time from the different system measurement report The value of the difference and the value of the round trip time or the extended round trip time; and calculating the value of the UE to NB transmission delay when the UE is in the UMTS cell according to the following formula, and calculating the calculated value of the transmission delay Value converted to TA: UE-to-NB transmission delay in the UMTS cell = (round trip time or extended round trip time - UE Rx-Tx time difference) /2; the UE Rx-Tx time difference characterizes the UE The time difference between the downlink dedicated physical channel frame reception time and the uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time; the round trip time or extended round trip time indicates that the NB receives the uplink dedicated physical control channel frame time and the NB downlink dedicated The time difference of the physical channel frame transmission time.

With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation, the sending module is configured to configure an added measurement additional measurement item in the measurement control message, where the additional measurement item is And including the UE positioning measurement item; sending the different system measurement control message to the UE.

In a fourth aspect, an embodiment of the present invention provides a radio network controller RNC, which is located in a universal mobile communication service UMTS network, and includes:

a processor, configured to receive, by the user equipment UE that is in its jurisdiction, a measurement report that includes a co-located long-term evolution LTE neighboring cell, and make a handover decision of the UE to the target LTE cell;

a transceiver, configured to: after the processor makes a handover decision of the UE to the target LTE cell, send a handover request message to the target base station eNB; receive a handover request response message returned by the target eNB, where the handover request response message carries And the uplink resource information that is sent by the target eNB to the UE to send a handover complete message; and after receiving the handover request response message returned by the target eNB, sending a handover command to the UE, instructing the UE to follow the handover command The uplink resource information carried in the source, the indication of the random access channel RACH procedure without the target cell, and the timing advance TA information are used to complete the handover access from the source UMTS cell to the target LTE cell.

The fifth aspect, the embodiment of the present invention provides a user equipment UE, including:

a different system measurement module, configured to perform heterogeneous system measurement on the same station LTE neighboring area in the universal mobile communication service UMTS cell, and send the different system measurement report to the source radio network controller RNC;

a receiving module, configured to receive a handover command sent by the source RNC, where the handover command carries The uplink resource information allocated by the target base station eNB for the UE to send the handover complete message, the indication that the target cell does not need to perform the random access channel RACH procedure, and the timing advance TA information;

And a handover module, configured to complete handover access from the source UMTS cell to the target LTE cell according to the indication of the handover command.

With reference to the fifth aspect, in a first possible implementation manner, the receiving module is further configured to: when the UE is in a UMTS cell and in a DCH state of a dedicated transport channel, receive a measurement control measurement control delivered by the source RNC a message; a measurement of the boosting port of the Measurement Control message includes a user positioning measurement UE positioning measurement item;

The different system measurement module is further configured to perform an inter-system measurement according to the Measurement Control message, and include, on the source RNC, a different system including a UE Rx-Tx time difference and a round trip time or an extended round trip time. The UE Rx-Tx time difference characterizes the time difference between the UE downlink dedicated physical channel frame reception time and the uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time; the round trip time or extended round trip time The time difference between the NB receiving the uplink dedicated physical control channel frame time and the NB downlink dedicated physical channel frame sending time is characterized.

With reference to the fifth aspect, the first possible implementation manner of the fifth aspect, in the second possible implementation manner, the indication that the handover command carries the RACH process without going to the target cell is a No RACH indication or a co-site indication .

The sixth aspect of the present invention provides a user equipment UE, including:

a processor, configured to perform an inter-system measurement on a co-located LTE neighboring cell in a universal mobile communication service UMTS cell, and send an inter-system measurement to the source radio network controller RNC; and complete the indication according to the handover command Handover access from the source UMTS cell to the target LTE cell;

a transceiver, configured to receive a handover command sent by the source RNC, where the handover command carries uplink resource information that is allocated by the target eNB to the UE to send a handover complete message, and does not need to go to the target cell for random access. An indication of the channel RACH procedure and a timing advance TA information. In a seventh aspect, the embodiment of the present invention provides a network switching system of a universal mobile communication service UMTS to a long-term evolution LTE, including:

The radio network controller RNC is located in the UMTS, and is configured to send a handover request message to the target base station eNB according to the handover report including the measurement report of the co-located LTE neighboring cell sent by the user equipment UE, to the target base station eNB; a handover request response message, where the handover request response message carries uplink resource information that is sent by the target eNB to the UE to send a handover complete message; and sends a handover command to the UE, where the handover command carries The uplink resource information, the indication that the random access channel RACH process is not required to go to the target cell, and the timing advance TA information;

a UE, configured to send a measurement report including a co-located LTE neighboring cell to the RNC, and receive a handover command sent by the source RNC, and complete a handover from a source UMTS cell to a target LTE cell according to the indication of the handover command. Access.

Advantageous effects of embodiments of the present invention include:

The UMTS-to-LTE network handover method, device, and system provided by the embodiment of the present invention, in a scenario of a co-site, the handover command sent by the source RNC to the UE includes an indication that the RACH process is not required to go to the target cell, and Since the uplink resource of the handover completion message is pre-allocated by the UE, and the value of the TA is determined by the source RNC in advance, the three contents are carried in the handover command and sent to the UE, and the UE may receive the handover command after receiving the handover command. The access to the target cell is performed directly, and the RACH process does not need to be performed in the target cell, which shortens the interruption delay caused by the RACH process, and also saves related resources of the RACH. DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following drawings will be briefly described in the description of the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying creative labor.

1 is a schematic diagram of a network switching process of UMTS to LTE in the prior art; 2 is a flowchart of a UMTS to LTE network handover method on a source RNC side according to an embodiment of the present invention;

3 is a relationship diagram of a round trip time and a UE Rx-Tx time difference according to an embodiment of the present invention;

4 is a flowchart of a UE handover method of a UMTS to LTE network handover method according to an embodiment of the present invention;

Figure 5 is a detailed flow chart of the first embodiment;

Figure 6 is a detailed flow chart of the second embodiment.

FIG. 7 is a schematic diagram of a first structure of a radio network controller according to an embodiment of the present invention; FIG. 8 is a schematic diagram of a second structure of a radio network controller according to an embodiment of the present invention; FIG. 10 is a schematic diagram of a first structure of a user equipment according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a second structure of a user equipment according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a network switching system of UMTS to LTE according to an embodiment of the present invention. detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. . All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

A specific implementation manner of a UMTS to LTE network switching method, device, and system according to an embodiment of the present invention is described below with reference to the accompanying drawings.

A UMTS-to-LTE network handover method is provided in the embodiment of the present invention. The process of the service RNC (hereinafter referred to as the source RNC) of the UE in the UMTS is as shown in FIG. 2, and includes the following steps:

S201. The source service RNC in the UMTS is based on the measurement report sent by the UE and including the co-located LTE neighboring cell. After making a handover decision to the target LTE cell, sending a handover request message to the target eNB;

5202. The source RNC receives a handover request response message that is returned by the target eNB, where the handover request response message carries uplink resource information that is allocated by the target eNB for the UE to send a handover complete message.

The source RNC sends a handover command to the UE, and instructs the UE to complete the handover from UMTS to LTE according to the uplink resource information carried in the handover command, the indication of the RACH procedure without the target cell, and the TA information.

After receiving the handover command sent by the source RNC, the UE may directly access the target cell by using the related information carried in the handover command, and obtain the uplink resource information and the TA information without performing the RACH process. Compared with the prior art, since the RACH process performed by the UE in the LTE after receiving the handover command is omitted, the network handover interruption delay of the UMTS to LTE is shortened, and the dedicated Preamble code resource is saved.

In the foregoing method provided by the embodiment of the present invention, the uplink resource used by the UE to subsequently send the handover complete message may be allocated by the target eNB in advance and notified to the UE by the source RNC. For the value of the TA, the source RNC may adopt the following two manners. To get:

1. The source RNC converts the propagation delay (PD) of the UE to the NB when the UE is in the UMTS cell to obtain the value of the TA.

When the UE is in the UMTS cell, the source RNC can obtain the transmission delay parameter of the UE to the NB through the RACH procedure: a propagation delay parameter or an extended propagation delay parameter, and the accuracy is defined according to the protocol. 2chip, which is 0.52us, and the accuracy of the TA obtained by the RACH process in LTE is 0.52us, so the accuracy of these two parameters is on the same order of magnitude, and in the case of eNB and NB co-site or common antenna, UE to eNB and The distance from the UE to the NB is the same, that is, the same signal transmission delay. Therefore, when the UE is handed over from the UMTS cell to the LTE cell, the UE can use the propagation delay or Extended propagation delay parameter in the UMTS to obtain the signal. The TA performs the first uplink transmission time adjustment of the target cell.

2, the source RNC can be set to ^ ^ off; then the amount to get J round trip time and extended round trip Time (Optional) The source RNC may first calculate the value of the UE to NB transmission delay (hereinafter referred to as PD) in the UMTS cell according to the following formula, and then convert the PD value to the TA value:

PD=(round trip time or extended round trip time - UE Rx-Tx time difference)/2.

In the above formula, the UE Rx-Tx time difference characterizes the time difference between the UE downlink dedicated physical channel frame reception time and the uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time; round trip time or extended round trip time indicates that the NB receives the uplink The time difference between the dedicated physical control channel frame time and the NB downlink dedicated physical channel frame transmission time.

The round trip time and extended round trip time (optional) parameters indicate the transmission delay of the signal from NB to the UE and back to NB with an accuracy of 0.5 chip or 0.13us. At the same time, there is a time difference between the uplink transmission and the downlink reception of the UE, that is, the parameter UE Rx-Tx time difference, and the accuracy is 1.5 chip or 0.39us. The time relationship between these two parameters is 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 is approximately equal to the transmission delay between NB and UE. PD, the TA obtained by converting the PD, and the transmission delay accuracy obtained by this method can be directly utilized in the same order of magnitude as the TA.

Since the units of the PD and the TA are different, the PD is converted into a unit, and the value of the corresponding TA can be obtained. The specific conversion process belongs to the prior art and will not be described here.

The network switching method of the UMTS to the LTE provided by the embodiment of the present invention, for the process on the UE side, as shown in FIG. 4, includes the following steps:

S401. The UE sends a measurement report including a co-located LTE neighboring cell to the source RNC in the UMTS cell.

The UE receives the handover command sent by the source RNC, where the handover command carries the uplink resource information that the target eNB allocates for the UE to send the handover complete message, the indication that the target cell does not need to perform the RACH procedure, and the TA information.

S403. The UE completes the handover from UMTS to LTE according to the indication of the handover command. The method for obtaining the value of the TA in the TA information and the method for obtaining the uplink resource information in the foregoing process are the same as those described above, and are not described here.

In order to better illustrate the UMTS to LTE network handover method provided by the embodiment of the present invention, the following It will be explained in two specific embodiments.

Embodiment 1:

The flow of the first embodiment is as shown in FIG. 5, and includes the following steps:

S501: The UE sends a measurement report including a co-located LTE neighboring cell to the source RNC in the UMTS serving cell.

5502. The source RNC makes a handover decision to the target LTE cell, and sends a handover request message to the target eNB.

S503. The target eNB performs the admission and related resource preparation, and sends a handover request response message to the source RNC. The handover request response message includes uplink resource information that is allocated to the UE to send the handover complete message.

S504. The source RNC sends a handover command to the UE, where the handover command includes the following content in addition to the conventional content:

a) switching the uplink resource information in the request response message;

b) informing the UE that there is no need to go to the target cell to perform an indication of the RACH procedure; the indication may be, for example, a No RACH indication or a co-site indication;

c) TA information, the value of TA passes the propagation delay or Extended in the UMTS system

S505. The UE sends a handover complete message directly to the target eNB according to the uplink resource information in the handover command. The other steps are the same as the normal UMTS to LTE network handover process.

Embodiment 2:

The process of the second embodiment is as shown in FIG. 6, and includes the following steps:

S601. In the case that the eNB is co-located with the NB, the source RNC configures the system measurement for the UE in the DCH state (the state of the UE in the connected mode, named by the Dedicated Transport Channels (D CH )). When the additional measurement (additional meas urement) item is configured, the additional measurement item includes a UE po sitioning measurement item;

Specifically, in this S601, the source RNC may perform measurement control on the UE. The (Measure Control) message is configured with an additional measurement item, and the additional measurement item includes a UE positioning measurement item. After the measurement control message is sent to the UE, the UE performs round trip time and UE Rx-Tx time difference measurement.

S602. The UE sends a measurement report including a co-located LTE neighboring cell to the source RNC in the UMTS serving cell.

S603. The source RNC makes a handover decision to the target LTE cell according to the measurement report that includes the co-located LTE neighboring cell, and sends a handover request message to the target eNB.

S604. The target eNB performs the admission and related resource preparation, and sends a handover request response message to the source RNC. The handover request response message includes uplink resource information that is allocated to the UE to send the handover complete message.

S605. The source RNC obtains a measurement report including the round trip time and the extended round trip time (optional) and the UE Rx-Tx time difference, according to the formula PD=(round trip time or extended round trip time - UE Rx-Tx Time difference) / 2 Calculate the PD, and then convert the PD to calculate the TA value.

S606. The source RNC sends a handover command to the UE, where the handover command includes the following contents in addition to the conventional content:

a) switching the uplink resource information in the request response message;

b) informing the UE that there is no need to go to the target cell to perform an indication of the RACH procedure; the indication may be a No RACH indication or a co-site indication;

c) TA information whose value is obtained in the foregoing S604 according to round trip time and extended round trip time (optional) and UE Rx-Tx time difference calculation;

S607. The UE sends a handover completion message directly to the target eNB according to the uplink resource information in the handover command. The other steps are the same as the normal UMTS to LTE network handover procedure.

Based on the same inventive concept, an embodiment of the present invention further provides a radio network controller, a user equipment, and a network switching system of UMTS to LTE. The principle of the problem solved by these devices and systems is similar to the foregoing UMTS to LTE network switching method. Therefore, the implementation of these devices and systems can be referred to the implementation of the foregoing method, and the repeated description will not be repeated. The radio network controller provided by the embodiment of the present invention, as shown in FIG. 7, includes:

a handover decision module 701, configured to receive, by the user equipment UE that is in its jurisdiction, a measurement report including a co-located long-term evolution LTE neighboring cell, to perform a handover decision of the UE to the target LTE cell, and a sending module 702, configured to After the handover decision of the UE to the target LTE cell, the UE sends a handover request message to the target eNB; and after receiving the handover request response message returned by the target eNB, the receiving module 703 sends a handover command to the UE, indicating that the UE is in accordance with The uplink resource information carried in the handover command, the indication of the random access channel RACH procedure without the target cell, and the timing advance TA information to complete the handover access from the source UMTS cell to the target LTE cell;

The receiving module 703 is configured to receive a handover request response message that is returned by the target eNB, where the handover request response message carries uplink resource information that is sent by the target eNB to the UE to send a handover complete message.

Further, in a first possible implementation manner of the radio network controller provided by the embodiment of the present invention, as shown in FIG. 7, the method further includes: a TA information acquiring module 704, configured to: when the UE is in a UMTS cell The transmission delay of the UE to the base station NB obtained through the RACH procedure is converted to the value of the TA.

Further, in a first possible implementation manner of the foregoing radio network controller, when the UE is in a UMTS cell, the UE to NB transmission delay is a propagation delay Propagation Delay parameter or an extended transmission delay of the RNC side. Propagation Delay parameter.

Further, in the first possible implementation manner of the foregoing radio network controller, the indication carried in the handover command that does not need to go to the target cell to perform the RACH procedure is a No RACH indication or a co-site indication.

Further, the second possible implementation manner of the radio network controller provided by the embodiment of the present invention, as shown in FIG. 8, may further include: a TA information acquiring module 704;

Correspondingly, the sending module 702 is further configured to: when the UE is in the UMTS cell and in the DCH state of the dedicated transport channel, send a different system measurement control Measurement Control message, where the measurement control message includes a user positioning measurement UE positioning measurement item ; The receiving module 703 is further configured to receive a different system measurement report sent by the UE.

The ΤΑ information obtaining module 704 is configured to obtain, according to the different system measurement report, a value of a UE Rx-Tx time difference and a value of a round trip time or an extended round trip time; and calculate, according to the following formula, that the UE is in the UMTS cell The value of the transmission delay of the UE to the NB, and then the calculated value of the transmission delay is converted into the value of the TA: the transmission delay of the UE to the NB when the UE is in the UMTS cell = (round trip time or extended round trip Time-UE Rx-Tx time difference)/2; the UE Rx-Tx time difference characterizes a time difference between a UE downlink dedicated physical channel frame reception time and an uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time; The trip time or the extended round trip time characterizes the time difference between the NB receiving the uplink dedicated physical control channel frame time and the NB downlink dedicated physical channel frame transmission time.

In a second possible implementation manner of the radio network controller provided by the embodiment of the present invention, the sending module 702 is specifically configured to configure, in the measurement control message, an added measurement additional measurement item, where the additional measurement item includes the UE a positioning measurement item; sending the different system measurement control message to the UE.

In a third possible implementation manner of the radio network controller provided by the embodiment of the present invention, as shown in FIG. 9, the radio network controller includes:

The processor 901 is configured to receive, by the user equipment UE that is in its jurisdiction, a measurement report that includes a co-located long-term evolution LTE neighboring cell, and make a handover decision of the UE to the target LTE cell.

The transceiver 902 is configured to: after the processor 901 makes a handover decision of the UE to the target LTE cell, send a handover request message to the target eNB; and receive a handover request response message returned by the target eNB, where the handover request response message is carried And the uplink resource information that is sent by the target eNB to the UE to send a handover complete message; and after receiving the handover request response message returned by the target eNB, sending a handover command to the UE, instructing the UE to follow the The uplink resource information carried in the handover command, the indication of the random access channel RACH procedure without the target cell, and the timing advance TA information are used to complete the handover access from the source UMTS cell to the target LTE cell.

A first implementation manner of the UE provided by the embodiment of the present invention, as shown in FIG. 10, includes: a different system measurement module 1001, configured to be in the same station in a universal mobile communication service UMTS area The LTE neighboring cell performs the inter-system measurement, and sends the inter-system measurement report to the source radio network controller RNC. The receiving module 1002 is configured to receive the handover command sent by the source RNC, where the handover command carries the target base station _e NB The uplink resource information allocated by the UE to send a handover complete message, the indication that the target cell does not need to perform a random access channel RACH procedure, and the timing advance TA information;

The switching module 1003 is configured to complete handover access from the source UMTS cell to the target LTE cell according to the indication of the handover command.

Further, in a first possible implementation manner of the foregoing user equipment, the receiving module 1003 is further configured to: when the UE is in a UMTS cell and in a dedicated transport channel DCH state, receive a measurement control Measurement Control sent by the source RNC. a message; the additional measurement of the Measurement Control message includes a user positioning measurement UE positioning measurement item;

The different system measurement module 1001 is further configured to perform an inter-system measurement according to the Measurement Control message, and include, on the source RNC, a different system including a UE Rx-Tx time difference and a round trip time or an extended round trip time. The UE Rx-Tx time difference characterizes the time difference between the UE downlink dedicated physical channel frame reception time and the uplink dedicated physical control channel/uplink dedicated physical data channel frame transmission time; the round trip time or extended round trip time The time difference between the NB receiving the uplink dedicated physical control channel frame time and the NB downlink dedicated physical channel frame sending time is characterized.

Further, in the first possible implementation manner of the user equipment, the indication that the handover command carries the RACH procedure without going to the target cell is a No RACH indication or a co-site indication.

A second implementation manner of the UE provided by the embodiment of the present invention, as shown in FIG. 11, includes: a processor 1101, configured to perform heterogeneous system measurement on a co-located LTE neighboring cell in a universal mobile communication service UMTS cell, and send a different The system measurement report is sent to the source radio network controller RNC; and the handover access from the source UMTS cell to the target LTE cell is completed according to the indication of the handover command; the transceiver 1102 is configured to receive the handover command sent by the source RNC, The handover command carries uplink resource information that is allocated by the target base station eNB for the UE to send a handover complete message, There is no need to go to the target cell to perform an indication of the random access channel RACH procedure and the timing advance TA information.

A UMTS-to-LTE network switching system provided by the embodiment of the present invention, as shown in FIG. 12, includes:

a radio network controller (RNC) 1201, located in the UMTS, configured to send a handover request message to the target base station eNB after making a handover decision to the target LTE cell according to the measurement report of the co-located LTE neighboring cell sent by the user equipment UE 1202; And receiving, by the target eNB, a handover request response message, where the handover request response message carries uplink resource information that is sent by the target eNB to the UE 1202 to send a handover complete message; and sends a handover command to the UE 1202. The handover command carries the uplink resource information, an indication that the target cell does not need to perform a random access channel RACH procedure, and a timing advance TA information;

The UE 1202 is configured to send a measurement report including a co-located LTE neighboring cell to the RNC 1201, and receive a handover command sent by the source RNC, and complete, according to the indication of the handover command, a source UMTS cell to a target LTE cell. Switch access.

The UMTS-to-LTE network handover method, device, and system provided by the embodiment of the present invention, in a scenario of a co-site, the handover command sent by the source RNC to the UE includes an indication that the RACH process is not required to go to the target cell, and Since the uplink resource of the handover completion message is pre-allocated by the UE, and the value of the TA is determined by the source RNC in advance, the three contents are carried in the handover command and sent to the UE, and the UE may receive the handover command after receiving the handover command. The access to the target cell is performed directly, and the RACH process does not need to be performed in the target cell, which shortens the interruption delay caused by the RACH process, and also saves related resources of the RACH.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.

The present invention is directed to a method, apparatus (system), and computer program according to an embodiment of the present invention. The flow chart and/or block diagram of the product is described. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and modifications The spirit and scope of the embodiments of the present invention are departed. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

Rights request

1. A network switching method from universal mobile communication service UMTS to Long Term Evolution LTE, which is characterized by including:

In UMTS, the source serving radio network controller RNC makes a handover decision to the target LTE cell based on the measurement report containing the co-station LTE neighbor cell sent by the user equipment UE, and then sends a handover request message to the target base station eNB;

The source RNC receives the handover request response message returned by the target eNB, and the handover request response message carries the uplink resource information allocated by the target eNB to the UE for sending the handover completion message;

The source RNC sends a handover command to the UE, instructing the UE to complete the process according to the uplink resource information carried in the handover command, the instruction that there is no need to go to the target cell to perform the random access channel RACH process, and the time advance TA information. Handover access from source UMTS cell to target LTE cell.

2. The method of claim 1, wherein the TA information is obtained by the source RNC in the following manner:

The source RNC converts the transmission delay from the UE to the base station NB obtained through the RACH process when the UE is in the UMTS cell into the value of the TA.

3. The method of claim 2, wherein when the UE is in a UMTS cell, the transmission delay from the UE to the NB is the transmission delay Propagation Delay parameter of the source RNC side or the extended transmission delay Extended Propagation Delay parameter.

4. The method according to any one of claims 1-3, wherein the indication carried in the handover command that it is not necessary to go to the target cell to perform the RACH process is a No RACH indication or a co-station indication.

5. The method of claim 1, wherein the TA information is obtained by the source RNC in the following manner:

The source RNC sends an inter-system measurement control Measurement Control message to the UE when it is in the UMTS cell and in the dedicated transmission channel DCH state, and the measurement control message contains the user positioning measurement UE positioning measurement item; The source RNC receives the inter-system measurement report sent by the UE, and obtains the value of the UE Rx-Tx time difference and the value of round trip time or extended round trip time from the inter-system measurement report;

The source RNC calculates the value of the transmission delay from the UE to the NB when the UE is in the UMTS cell according to the following formula, and then converts the calculated value of the transmission delay into the value of the TA:

When the UE is in a UMTS cell, the transmission delay from the UE to the NB = (round trip time or extended round trip time -UE Rx-Tx time difference)/2;

The UE Rx-Tx time difference represents the time difference between the UE downlink dedicated physical channel frame receiving time and the uplink dedicated physical control channel/uplink dedicated physical data channel frame sending time;

The round trip time or extended round trip time represents the time difference between the time when the NB receives the uplink dedicated physical control channel frame and the time when the NB sends the downlink dedicated physical channel frame.

6. The method according to claim 5, characterized in that the source RNC sends an inter-system measurement control message to the UE, including:

The source RNC configures an additional measurement item in the measurement control message, and the additional measurement item includes the UE positioning measurement item; and the source RNC delivers the inter-system measurement control message to the UE.

7. A network switching method from universal mobile communication service UMTS to Long Term Evolution LTE, which is characterized by including:

The user equipment UE sends a measurement report containing the LTE neighbor cell of the same station to the source radio network controller RNC in the UMTS cell;

The UE receives the handover command sent by the source RNC. The handover command carries the uplink resource information allocated by the target base station eNB to the UE for sending the handover completion message. There is no need to go to the target cell to perform random access channel RACH. Process instructions and time advance TA information; The UE completes handover access from the source UMTS cell to the target LTE cell according to the instructions of the handover command.

8. The method of claim 7, wherein the TA information is obtained by the source RNC in the following manner: The source RNC converts the transmission delay from the UE to the NB obtained through the RACH process when the UE is in the UMTS cell into the value of the TA.

9. The method of claim 8, wherein when the UE is in a UMTS cell, the transmission delay from the UE to the NB is the transmission delay Propagation Delay parameter on the source RNC side or the Extended Propagation Delay parameter. .

10. The method of claim 7, further comprising: when the UE is in a UMTS cell and in a dedicated transmission channel DCH state, receiving a Measurement Control message issued by the source RNC, the Measurement Control The additional measurement item of the message includes a user positioning measurement UE positioning measurement item; the UE performs inter-system measurement according to the Measurement Control message, and sends the UE Rx-Tx time to the source RNC. Different system measurement reports of difference and round trip time or extended round trip time;

The value of TA in the handover command received by the UE is obtained in the following manner:

The source RNC calculates the value of the transmission delay from the UE to the NB when the UE is in the UMTS cell according to the following formula, and then converts the calculated value of the transmission delay into a TA value:

The round trip time or extended round trip time represents the time difference between the NB receiving the uplink dedicated physical control channel frame and the NB sending the downlink dedicated physical channel frame.

11. The method according to any one of claims 7 to 10, wherein the indication carried in the handover command that it is not necessary to go to the target cell to perform the RACH process is a No RACH indication or a co-station indication.

12. A radio network controller RNC, located in the universal mobile communication service UMTS network, is characterized by including:

A handover decision module, configured to make a handover decision from the UE to the target LTE cell after receiving a measurement report containing the Long Term Evolution LTE neighbor cell of the same station sent by the user equipment UE under its jurisdiction; The sending module is configured to send a handover request message to the target base station eNB after making a handover decision of the UE to the target LTE cell; and after the receiving module receives the handover request response message returned by the target eNB, send the handover request message to the UE. command, instructing the UE to complete the handover from the source UMTS cell to the target LTE cell according to the uplink resource information carried in the handover command, the instruction that there is no need to go to the target cell to perform the random access channel RACH process, and the time advance TA information. Access;

A receiving module, configured to receive a handover request response message returned by the target eNB, where the handover request response message carries uplink resource information allocated by the target eNB to the UE for sending a handover completion message.

13. The RNC as claimed in claim 12, further comprising:

The TA information acquisition module is used to convert the transmission delay from the UE to the base station NB obtained through the RACH process when the UE is in the UMTS cell into the value of the TA.

14. The RNC of claim 13, wherein when the UE is in a UMTS cell, the transmission delay from the UE to the NB is the transmission delay Propagation Delay parameter on the RNC side or the Extended Propagation Delay. parameter.

15. The RNC according to any one of claims 12 to 14, wherein the indication carried in the handover command that it is not necessary to go to the target cell to perform the RACH process is a No RACH indication or a co-station indication.

16. The RNC according to claim 12, further comprising: a TA information acquisition module;

The sending module is also configured to send an inter-system measurement control Measurement Control message to the UE when it is in the UMTS cell and is in the dedicated transmission channel DCH state. The measurement control message includes a user positioning measurement UE positioning measurement item;

The receiving module is also used to receive the different system measurement report sent by the UE;

The TA information acquisition module is used to obtain the value of UE Rx-Tx time difference and the value of round trip time or extended round trip time from the different system measurement report; and calculate the UE in the UMTS cell according to the following formula is the value of the transmission delay from UE to NB, and then the calculated The value of the transmission delay is converted into the value of TA: When the UE is in a UMTS cell, the transmission delay from the UE to the NB = (round trip time or extended round trip time -UE Rx-Tx time difference)/2; The UE Rx-Tx time difference represents the time difference between the UE downlink dedicated physical channel frame reception time and the uplink dedicated physical control channel/uplink dedicated physical data channel frame sending time; the round trip time or extended round trip time represents the NB receiving uplink dedicated physical control The time difference between the channel frame time and the NB downlink dedicated physical channel frame sending time.

17. The RNC according to claim 16, wherein the sending module is specifically configured to configure an additional measurement item in the measurement control message, and the additional measurement item includes the UE positioning measurement item; Deliver the inter-system measurement control message to the UE.

18. A user equipment UE, characterized by: including:

The inter-system measurement module is used to perform inter-system measurements on LTE neighboring cells of the same station in the universal mobile communication service UMTS cell, and send inter-system measurement reports to the source radio network controller RNC;

A receiving module, configured to receive a handover command sent by the source RNC. The handover command carries uplink resource information allocated by the target base station eNB to the UE for sending a handover completion message. There is no need to go to the target cell for random access. Channel RACH process indication and time advance TA information;

A handover module, configured to complete handover access from the source UMTS cell to the target LTE cell according to the instructions of the handover command.

19. The UE as claimed in claim 18, characterized in that,

The receiving module is also configured to receive the Measurement Control message issued by the source RNC when the UE is in the UMTS cell and in the dedicated transmission channel DCH state; and enhance the Measurement Control message. The measurement Additional measurement item includes the user positioning measurement UE positioning measurement item;

The inter-system measurement module is also configured to perform inter-system measurement according to the Measurement Control message, and send the inter-system measurement including UE Rx-Tx time difference and round trip time or extended round trip time to the source RNC. Measurement report; The UE Rx-Tx time The difference represents the time difference between the time when the UE receives the downlink dedicated physical channel frame and the time when the uplink dedicated physical control channel/uplink dedicated physical data channel frame is sent; the round trip time or extended round trip time represents the time when the NB receives the uplink dedicated physical control channel frame and the time when the uplink dedicated physical control channel frame is sent. The time difference between the sending time of the NB downlink dedicated physical channel frame.

20. The UE according to claim 18 or 19, wherein the indication carried in the handover command that it is not necessary to go to the target cell to perform the RACH process is a No RACH indication or a co-station indication.

21. A network switching system from universal mobile communication service UMTS to Long Term Evolution LTE, which is characterized by including:

The radio network controller RNC, located in UMTS, is used to make a handover decision to the target LTE cell based on the measurement report containing the LTE neighbor cell of the same station sent by the user equipment UE, and then send a handover request message to the target base station eNB; receive the return from the target eNB a handover request response message, the handover request response message carries the uplink resource information allocated by the target eNB to the UE for sending a handover completion message; sends a handover command to the UE, the handover command carries There is the uplink resource information, an indication that there is no need to go to the target cell to perform the random access channel RACH process, and the time advance TA information;

The UE is configured to send measurement reports containing co-site LTE neighbor cells to the RNC, receive handover commands sent by the source RNC, and complete handover from the source UMTS cell to the target LTE cell according to the instructions of the handover command. access.