CN106941701B - Cell switching method of terminal cell and related device - Google Patents
Cell switching method of terminal cell and related device Download PDFInfo
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- CN106941701B CN106941701B CN201710254006.5A CN201710254006A CN106941701B CN 106941701 B CN106941701 B CN 106941701B CN 201710254006 A CN201710254006 A CN 201710254006A CN 106941701 B CN106941701 B CN 106941701B
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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Abstract
The invention discloses a cell switching method of a T-SC, a T-SC terminal and user equipment, wherein the cell switching method of the T-SC comprises the following steps: determining a first candidate target T-SC terminal set through an early switching process; determining a second candidate target T-SC terminal set through a switching process; and sending a switching command to the UE so that the UE determines a target T-SC terminal for cell switching according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set. The invention can realize the efficient and reliable cell switching of the T-SC network.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a Cell handover method for a terminating Cell (T-SC) and a related device.
Background
Handover is an important function that must be provided by a cellular mobile communication system. The change of the LTE network architecture also emphasizes that the handover mechanism is different from that of the 3G system. A User Equipment (UE) in a Radio Resource Control (RRC) connected state is served by only 1 base station (eNB) at any time in an LTE system. When the UE moves or the surrounding environment changes, if the eNB serving the UE has a signal strength lower than a certain threshold, a handover procedure needs to be started to ensure service continuity, so that the UE is accessed to the eNB whose signal quality meets the requirements. Of course, it is also possible to initiate handover for other reasons, such as load control or when the count value corresponding to the transmitted data packet reaches a maximum, and initiate intra-cell handover for security reasons, so as to update the UE with a new key, etc. The switching of the LTE system adopts a network control UE assisted switching mode, namely the UE can report channel state information to the network for the network to refer when switching judgment is carried out, but can not automatically judge whether switching is carried out, and a switching command must be issued to the UE by the network.
In the existing communication system, in order to balance system load and expand coverage, throughput is improved, and a large number of heterogeneous networks are deployed. Due to the dense deployment of heterogeneous networks and complex scenes, mobility management in the heterogeneous networks becomes an important problem. In a super-dense heterogeneous network, the mobility of the UE may cause frequent movement from one cell to another cell, and in order to ensure the continuity of communication and quality of service (QoS), the system may trigger a handover procedure of the UE. In the switching process in the heterogeneous network, due to different power configurations and same frequency interference between different layers of the heterogeneous network, a link during switching is unstable, and switching failure is caused. Therefore, 3GPP has done a lot of work on the improvement of handover schemes in heterogeneous network mobility enhancement, and the "early handover" scheme can greatly reduce handover failure caused by link failure when a handover command in handover arrives. The "early handover" scheme can be generally divided into three phases, namely: an early handover procedure, a handover procedure and a resource release procedure.
In the scheme, because the UE acquires the information of the target base station to be switched in the early switching process in advance, even if the UE fails to receive the switching command in the actual switching process, the switching can be successfully achieved according to the information of the target base station acquired in advance, the success rate of the switching is greatly improved, and the switching performance is improved. However, the early handover scheme may greatly improve the handover success rate of the conventional heterogeneous UE, but is not suitable for cell handover in a dynamic terminal network.
Disclosure of Invention
The invention mainly aims to provide a cell switching method of a T-SC, a T-SC terminal and user equipment, so as to solve the problem that an early switching scheme in the prior art is not suitable for cell switching in a dynamic terminal network.
In order to solve the above problem, an embodiment of the present invention provides a cell handover method for a terminating cell T-SC, including:
determining a first candidate target T-SC terminal set through an early switching process;
determining a second candidate target T-SC terminal set through a switching process;
and sending a switching command to the UE so that the UE determines a target T-SC terminal for cell switching according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set.
An embodiment of the present invention further provides a cell handover method for T-SC, which includes:
sending an early handover preparation request comprising information of a plurality of candidate target T-SC terminals to a source T-SC terminal so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early handover process;
sending a measurement report including information of a plurality of candidate target T-SC terminals to the source T-SC so that the source T-SC terminal determines a second candidate target T-SC terminal set through a switching process;
and determining a target T-SC terminal according to the first switchable candidate target T-SC terminal set and/or the second switchable candidate target T-SC terminal set.
There is also provided, in accordance with an embodiment of the present invention, a T-SC terminal, including:
a first determining module, configured to determine a first candidate target T-SC terminal set through an early handover process;
a second determining module, configured to determine a second candidate target T-SC terminal set through a handover process;
and a switching command sending module, configured to send a switching command to the UE, so that the UE determines a target T-SC terminal according to the first switchable candidate target T-SC terminal set and/or the second switchable candidate target T-SC terminal set.
There is also provided, in accordance with an embodiment of the present invention, user equipment, including:
an early handover preparation request sending module, configured to send an early handover preparation request including information of multiple candidate target T-SC terminals to a source T-SC terminal, so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early handover process;
a measurement report sending module, configured to send a measurement report including information of multiple candidate target T-SC terminals to the source T-SC, so that the source T-SC determines a second candidate target T-SC terminal set through a handover process;
and the target terminal determining module is used for determining the target T-SC terminal according to the first switchable candidate target T-SC terminal set and/or the second switchable candidate target T-SC terminal set.
According to the technical scheme of the invention, the target T-SC terminal information of the switching is obtained through the early switching process, and the target T-SC terminal information of the early switching process is combined to carry out the cell switching in the switching process, so that the UE can carry out the efficient and reliable cell switching in the T-SC network.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a cell handover method of a T-SC according to one embodiment of the present invention;
fig. 2 is a flowchart of a cell handover method of a T-SC according to another embodiment of the present invention;
fig. 3 is a flowchart of a cell handover method of a T-SC according to still another embodiment of the present invention;
fig. 4 is a block diagram of a T-SC terminal according to an embodiment of the present invention;
FIG. 5 is a block diagram of the structure of a first determination module according to an embodiment of the invention;
FIG. 6 is a block diagram of a second determination module according to an embodiment of the invention;
fig. 7 is a block diagram of a structure of a user equipment according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is applied to a T-SC cell, a source T-SC terminal (a terminal supporting the T-SC function) provides base station service for User Equipment (UE) and switches to a target T-SC terminal to provide the base station service for the UE, wherein the T-SC terminal is the terminal supporting the T-SC function.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a cell handover method of a T-SC according to an embodiment of the present invention, the execution subject of the method is a source T-SC terminal. As shown in fig. 1, the method comprises the steps of:
step S102, a first candidate target T-SC terminal set is determined through an early switching process.
In a T-SC cell, the mobility of the UE may cause the UE to move from one cell to another cell, and in order to ensure the continuity and Quality of Service (QoS) of communication, a handover procedure of the UE may be triggered. In the embodiment of the invention, in order to improve the link stability during the T-SC cell switching, the early switching process is executed before the formal switching process.
The early handover process is completed within a Time To Trigger (TTT for short) before the handover process (i.e., the formal handover process). After the TTT is triggered, the source T-SC terminal receives early handover preparation request information sent by the UE, where the early handover preparation request information includes information of candidate target T-SC terminals selected by the UE, and is denoted as Tn (n is 1, 2, and 3 … … n). Then, the candidate target T-SC terminals are compared with a preset threshold value of switchable candidate target T-SC terminals, and a switchable candidate target T-SC terminal set is formed by the candidate target T-SC terminals greater than the threshold value, and is denoted as Tm (m is 1, 2, 3 … … n, and m < isn). And then, the source T-SC terminal broadcasts and transmits an early handover request message to the candidate target T-SC terminal set Tm, wherein the early handover request message mainly carries an X2 signaling context reference, a Radio Access Bearer (E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, Evolved UMTS Terrestrial Radio Access Network) Radio Access Bearer, for short, an E-RAB) context, and the like.
The T-SC terminal (i.e. T-SC terminal in Tm) receiving the early switching request judges whether to permit access according to the QoS information of the received E-RAB, reserves resources if judging to permit the access, and feeds back an early switching permission response message (ACK) comprising the reserved resources to the source T-SC terminal. And the source T-SC terminal receives the early switching permission response message, establishes a candidate target T-SC terminal list according to the T-SC terminal feeding back the early switching permission response message, and sends the information of the candidate target T-SC terminal list to the UE through an early switching command. Unlike the prior art, the target T-SC terminal to be handed over is not selected at this time, and since both the T-SC terminal and the UE are in a moving state, the above steps are periodically performed and the list of candidate target T-SC terminals to be handed over is updated until the TTT is over.
And after the TTT is finished, the T-SC terminal in the candidate target T-SC terminal list received by the UE through the early switching command is the first candidate target T-SC terminal set.
And step S104, determining a second candidate target T-SC terminal set through a switching process.
The UE uploads a measurement report comprising information of a plurality of candidate target T-SC terminals, the source T-SC terminal determines the current switchable candidate target T-SC terminals according to the measurement report, and broadcasts and sends a switching request message to the candidate target T-SC terminals, wherein the switching request message mainly carries X2 signaling context reference, E-RAB context and the like.
And the T-SC terminal receiving the switching request judges whether to permit access according to the QoS information of the received E-RAB, reserves resources if the access is permitted, and feeds back a switching permission response message (ACK) to the source T-SC terminal.
And the source T-SC terminal determines a second candidate target T-SC terminal set according to the T-SC feeding back the switching permission response message, and sends the information of the second candidate target T-SC terminal set to the UE.
Step S106, sending a switching command to the UE, so that the UE determines a target T-SC terminal for cell switching according to the first switchable candidate target T-SC terminal set and/or the second switchable candidate target T-SC terminal set.
In an embodiment of the present invention, the source T-SC terminal intersects the set of candidate target T-SC terminals (for example, denoted as Tm) in the early handover with the set of candidate target T-SC terminals (for example, denoted as Tu) after receiving the handover response to form a set of switchable candidate target T-SC terminals Ti, which has the characteristics of good channel quality, long communication time, and good communication distance between the UE and the switchable candidate T-SC.
And the source T-SC terminal broadcasts and sends a sequence state transmission message and data forwarding to the switchable candidate target T-SC terminal set Tm. And if the switching command is not received successfully, the UE selects a T-SC terminal with the optimal channel quality and communication time from the candidate target T-SC terminals to access by using reserved resources switched early.
Fig. 2 is a flowchart of a cell handover method of a T-SC according to another embodiment of the present invention, the main execution subject of the method being a UE. As shown in fig. 2, the method comprises the steps of:
step S202, an early switching preparation request comprising a plurality of candidate target T-SC terminal information is sent to a source T-SC terminal, so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early switching process;
step S204, sending a measurement report including information of a plurality of candidate target T-SC terminals to the source T-SC, so that the source T-SC terminal determines a second candidate target T-SC terminal set through a switching process;
step S206, determining the target T-SC terminal according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set.
Prior to step S206, the method further comprises: receiving a switching command sent by the source T-SC terminal; based on this, step S206 further includes:
if the handover command is received successfully, determining a target T-SC terminal for cell handover according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, including: determining a target T-SC terminal from the same T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set;
if the switching command fails to be received, determining a target T-SC terminal according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, including: and determining the target T-SC terminal according to the first candidate target T-SC terminal set.
In one embodiment of the present invention, the determining the target T-SC terminal includes: and determining a target T-SC terminal to carry out cell switching according to the channel quality and the communicable time of the T-SC terminal.
An embodiment of the present invention is described in detail below with reference to fig. 3. Fig. 3 is a flowchart of a cell handover method of a T-SC according to another embodiment of the present invention, as shown in fig. 3, the method includes:
step S302, the UE initially communicates under the control of the source T-SC terminal, and the source T-SC terminal performs measurement configuration on the UE according to the area restriction information in the UE context. The measurement configuration information includes an object to be measured by the UE, a method of reporting a measurement report, and related configuration parameters. And the UE carries out measurement report according to the measurement configuration information sent by the source T-SC terminal, so that the source T-SC terminal can implement switching judgment.
In step S304, the LTE system defines 5 a-type measurement events and 2B-type measurement events, where the a-type events are used for measurement in the LTE system, and the B-type events are used for measurement when switching to a heterogeneous system. In the embodiment of the invention, the UE configures an A3 event, and when the difference between the signal strength of the neighbor cell and the signal strength of the serving cell is greater than a preset threshold, the UE is triggered to report the A3 event. When the source T-SC terminal receives the UE's a3 event report, the UE starts an early handover procedure.
In the embodiment of the invention, after the event A3 triggers the early handover process, the UE sends an early handover preparation request signaling to the source T-SC terminal. The early handover preparation signaling includes a candidate target T-SC terminal set selected by the UE, and is denoted as Tn (n is 1, 2, 3 … … n). And the source T-SC terminal compares the candidate target T-SC terminal set reported by the UE with the threshold of the switchable candidate target T-SC terminal, and forms the candidate target T-SC terminal which is greater than the threshold into a switchable candidate target T-SC terminal set which is marked as Tm (m is 1, 2, 3 … … n, and m < isn). In this embodiment, the threshold of the switchable candidate target T-SC terminal is determined by the maximum distance and the maximum relative speed between the UE and the T-SC terminal, and between the T-SC terminal and the T-SC terminal, and the switchable candidate target T-SC terminal obtains the relative distance and the relative speed between the source T-SC terminal and the candidate target T-SC terminal, and the relative distance and the relative speed between the UE and the candidate target T-SC terminal according to the positioning technology. Different from the candidate target base station selection in the prior art, the T-SC terminal is in motion, and when selecting the candidate target T-SC terminal, not only the channel quality between the UE and the candidate target T-SC terminal, but also the maximum distance that the T-SC terminal can perform communication, and the distance change between the UE and the candidate target T-SC terminal need to be considered, because the time length for which communication can be performed after handover needs to be determined.
T-SC terminals within the set Tm of candidate target T-SC terminals that are switchable are able to effect decryption of control signaling and user data through a specific configuration, thereby supporting D2D-based signaling and data broadcasting, allowing for efficient transmission of handover control signaling and user plane data to multiple T-SC terminals.
During the execution of steps S302 to S304, a data packet (packet data) is transmitted between the UE and the source T-SC terminal, and the source T-SC terminal may perform uplink configuration (UL allocation) on the UE.
In step S306, the source T-SC terminal broadcasts and sends an early handover request message to the set Tm of switchable candidate target T-SC terminals through a similar X2 interface formed by D2D (direct communication), where the content of the early handover request message mainly includes X2 signaling context reference, radio access bearer (E-RAB) context, and the like. The X2 signaling context reference enables candidate base stations to find a source base station. The E-RAB context includes necessary Radio Network Layer (RLN) and Transport Layer (TNL) addressing information, quality of service (QoS) information of the E-RAB, and the like.
In this embodiment, the switchable candidate target T-SC terminal set Tm includes: the switchable candidate target T-SC terminal 1 … … may switch the candidate target T-SC terminal N and the switchable candidate target T-SC terminal N, that is, the source T-SC terminal broadcasts and transmits the early handover request to the switchable candidate target T-SC terminal 1 … …, the switchable candidate target T-SC terminal N, and the switchable candidate target T-SC terminal N.
In the embodiment of the invention, the source T-SC terminal and the candidate target T-SC terminal are communicated by adopting the X2 interface formed by D2D, and the similar X2 interface of D2D does not need to maintain specific X2 resources with each candidate target T-SC terminal, but utilizes available wireless resources to broadcast and send the early switching request message, thereby improving the link utilization rate during the early switching request.
In step S308, the candidate target T-SC terminal feeds back an early handover grant response message (ACK). Specifically, the candidate target T-SC terminal receiving the early handover request message judges whether to permit access according to the QoS information of the received E-RAB, if the access is permitted, channel resources are reserved and configured, for example, the channel resources comprise a C-RNTI and RACH preamble resources, and an early handover permission response message ACK message is fed back to the source T-SC terminal. In practical applications, the number of candidate target T-SC terminals feeding back the early handover permission response should be less than or equal to the number of terminals in the set Tm. It is assumed in this embodiment for simplicity that both the switchable candidate target T-SC terminal 1 … … within the candidate target T-SC terminal set Tm and the switchable candidate target T-SC terminal N feed back the early handover permission response message.
In step S310, the source T-SC terminal sends the obtained candidate target T-SC terminal information granted access to the UE through an early handover command. Specifically, the source T-SC terminal establishes a candidate target T-SC terminal list according to the T-SC terminal that sends the early handover permission response message, and the source T-SC terminal sends information of the candidate target T-SC terminal list to the UE through the early handover command. In general, the terminal information in the target T-SC terminal list is constantly changing. For simplicity in this embodiment, it is assumed that the candidate target T-SC terminal list includes: the switchable candidate target T-SC terminal 1 … … may switch the information of the candidate target T-SC terminal N and the switchable candidate target T-SC terminal N.
During the execution of step S310, the source T-SC terminal sends a downlink resource allocation message (DL allocation) to the ue.
Unlike the prior art, the target T-SC terminal to be handed over is not selected at this time, and since both the T-SC terminal and the UE are in a moving state, steps S304-S310 are periodically performed, and the UE also synchronously updates the candidate target T-SC terminal list until the TTT is over. After the TTT is finished, the UE uses the T-SC terminals in the candidate target T-SC terminal list as a first candidate target T-SC terminal set, and assumes the first candidate target T-SC terminal set as a set Tm for simplicity, that is, the method includes: switchable candidate target T-SC terminal 1 … … may switch candidate target T-SC terminal N and switchable candidate target T-SC terminal N.
The steps are an early switching process, table tennis switching can be effectively avoided through the early switching process, and the switching success rate is improved. The handover procedure is described in detail below in connection with steps S312-316.
Step S312, the formal handover process starts, and the UE uploads a Measurement Report (Measurement Report) to the source T-SC terminal, where the Measurement Report includes information of a plurality of candidate target T-SC terminals. And the source T-SC terminal executes switching decision according to information such as a measurement report reported by the UE, and broadcasts and sends a switching request message to the multiple candidate target T-SC terminals. In this embodiment, the source T-SC terminal broadcasts and transmits the early handover request message to the candidate target T-SC terminals through the similar X2 interface formed by D2D, and makes full use of the available radio resources to broadcast and transmit the handover request message, thereby improving the link utilization.
And the candidate target T-SC terminal receiving the handover request message feeds back a handover permission response message to the source T-SC terminal, and the source T-SC terminal determines the second candidate target T-SC terminal set, which is denoted as Tu (u is 1, 2, 3 … … u), according to the candidate target T-SC terminal sending the handover permission response message. And the source T-SC terminal performs intersection taking on the first candidate target T-SC terminal set Tm and the second candidate target T-SC terminal set Tu determined by the early switching process to form a switchable candidate target T-SC terminal set Ti, wherein the T-SC terminal in the set Ti has the characteristics of good channel quality, long communication time and excellent communication distance between the source T-SC and the switchable candidate T-SC terminal.
In step S314, the source T-SC terminal sends a handover command message including information of a set of switchable candidate target T-SC terminals Ti to the UE. And, the source T-SC terminal broadcasts a transmission Sequence Status Transfer (Sequence Number Status Transfer) message for indicating a reception Status of uplink data and a transmission Status of downlink data in the source T-SC terminal to the first set of candidate target T-SC terminals Tm.
In step S314, the T-SC terminal performs Data Forwarding (Data Forwarding) to a plurality of terminals of the first candidate target T-SC terminal set Tm.
Step S316, judging whether the UE successfully receives the switching command, if so, the UE balances and selects the target T-SC terminal to access according to the requirements of the UE on the channel quality and the communication time in the Ti, and if not, the UE selects the T-SC terminal with the optimal channel quality and the optimal communication time in the candidate target T-SC terminal to access in the Tm by using the reserved resource in the early switching process. In this embodiment, a candidate target T-SC terminal N is selected for cell handover. And then, the UE and the T-SC terminal N carry out data interaction, determine uplink resources and complete RRC connection reconfiguration.
In practical application, the weight numbers of the two parameters, i.e., the channel quality and the communicable time, may be set, and the T-SC terminal that is optimal in combination with the weight numbers may be used to perform cell switching.
The following steps S318-320 are resource release procedures.
Step S318-320, when the target T-SC terminal indicates the source T-SC terminal to release the UE context after the switching is successful, the source T-SC terminal sends the reserved resource release signaling to the switchable candidate target T-SC terminal in a broadcast manner to release the reserved resource. In this embodiment, the source T-SC terminal sends a reserved resource release signaling to the switchable candidate target T-SC terminal n of T-SC terminal 1 … ….
Fig. 4 is a block diagram of a T-SC terminal according to an embodiment of the present invention, as shown in fig. 4, the T-SC terminal includes:
a first determining module 41, configured to determine a first candidate target T-SC terminal set through an early handover procedure;
a second determining module 42, configured to determine a second candidate target T-SC terminal set through a handover procedure;
a handover command sending module 43, configured to send a handover command to the UE, so that the UE determines a target T-SC terminal according to the first candidate target switchable T-SC terminal set and/or the second candidate target switchable T-SC terminal set.
Referring to fig. 5, the first determination module 41 includes:
an early handover preparation request receiving sub-module 411, configured to receive an early handover preparation request message that includes information of multiple candidate target T-SC terminals and is sent by the UE;
an early handover request broadcast transmitting sub-module 412, configured to broadcast and transmit an early handover request message to part or all of the candidate target T-SC terminals;
an early handover command sending sub-module 413, configured to receive the early handover grant response message, establish a candidate target T-SC terminal list according to the candidate target T-SC terminal that sent the early handover grant response message, and send an early handover command including information of the candidate target T-SC terminal list to the UE.
Wherein the early handover preparation request receiving submodule 411, the early handover request broadcast transmitting submodule 412 and the early handover command transmitting submodule 412 periodically execute the above processes in the TTT to complete the early handover process.
In an embodiment of the present invention, the first determining module 310 is further configured to, after the TTT is finished, take the T-SC terminals in the candidate target T-SC terminal list as a first candidate target T-SC terminal set.
The early handover request broadcast sending sub-module 412 is further configured to determine a candidate target T-SC terminal for receiving the early handover request message according to channel quality, relative distance, and relative speed between the UE and the T-SC terminal and between the T-SC terminals.
Referring to fig. 6, the second determination module 42 includes:
a measurement report receiving sub-module 421, configured to receive a measurement report that includes information of multiple candidate target T-SC terminals and is sent by the UE;
a switching request broadcast sending sub-module 422, configured to broadcast and send a switching request message to the multiple candidate target T-SC terminals, where the candidate target T-SC terminal that receives the switching request message feeds back a switching permission response message to the source T-SC terminal;
a handover command sending sub-module 423, configured to determine the second candidate target T-SC terminal set according to the candidate target T-SC terminals that send the handover permission response message, and send a handover command including information of the second candidate target T-SC terminal set to the UE.
In an embodiment of the present invention, the T-SC terminal further includes: a sequence status transmitting module (not shown) for broadcasting a sequence status transmission message to the first set of candidate target T-SC terminals.
With continuing reference to fig. 4, in an embodiment of the present invention, the T-SC terminal further includes:
a resource release sending module 44, configured to broadcast and send a resource release message to the T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set, except the target T-SC terminal.
In the embodiment of the invention, the T-SC terminals communicate with each other through an X2 interface formed by a direct communication mode.
Fig. 7 is a block diagram of a user equipment according to an embodiment of the present invention, as shown in fig. 7, the user equipment includes:
an early handover preparation request sending module 71, configured to send an early handover preparation request including information of multiple candidate target T-SC terminals to a source T-SC terminal, so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early handover process;
a measurement report sending module 72, configured to send a measurement report including information of multiple candidate target T-SC terminals to the source T-SC, so that the source T-SC determines a second candidate target T-SC terminal set through a handover process;
a target terminal determining module 73, configured to determine a target T-SC terminal according to the first switchable candidate target T-SC terminal set and/or the second switchable candidate target T-SC terminal set.
In one embodiment of the present invention, the user equipment further includes:
a handover command receiving module 74, configured to receive a handover command sent by the source T-SC terminal;
if the switching command is successfully received, the target terminal determining module 73 determines a target T-SC terminal from the same T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set; if the switching command fails to be received, the target terminal determining module 73 determines a target T-SC terminal according to the first candidate target T-SC terminal set.
The target terminal determining module determines the target T-SC terminal to carry out cell switching according to the channel quality and the communicable time of the T-SC terminal.
The operation steps of the method of the present invention correspond to the structural features of the device, and may be referred to one another, and are not described in detail.
The embodiment of the application also provides the mobile terminal. Fig. 8 is a schematic structural diagram of a mobile terminal 800 according to an embodiment of the present application. The mobile terminal 800 may include a processor 802, a transmitter 801, and a receiver 804. Optionally, a memory 803 is included. In particular applications, the transmitter 801 and receiver 804 may be coupled to an antenna 805.
The memory 803 stores programs. In particular, the program may include program code comprising computer operating instructions. The memory 803 may include both read-only memory and random-access memory, and provides instructions and data to the processor 802. The memory 803 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
A processor 802 configured to execute the following operations, optionally, the program stored in the memory 803, and specifically configured to execute the following operations:
determining a first candidate target T-SC terminal set through an early switching process;
determining a second candidate target T-SC terminal set through a switching process;
and sending a switching command to the UE so that the UE determines a target T-SC terminal for cell switching according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set.
Or, the processor 802 is configured to execute the following operations, and optionally, execute a program stored in the memory 803, and specifically, is configured to execute the following operations:
sending an early handover preparation request comprising information of a plurality of candidate target T-SC terminals to a source T-SC terminal so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early handover process;
sending a measurement report including information of a plurality of candidate target T-SC terminals to the source T-SC so that the source T-SC terminal determines a second candidate target T-SC terminal set through a switching process;
and determining the target T-SC terminal according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set.
The information display method as described above in the embodiment of fig. 1 or fig. 2 may be applied to the processor 802, or implemented by the processor 802. The processor 802 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 802. The Processor 802 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 803, and the processor 802 reads the information in the memory 803 and performs the steps of the above method in combination with the hardware thereof.
According to the technical scheme of the invention, the target T-SC terminal information of the switching is obtained through the early switching process, and the target T-SC terminal information of the early switching process is combined to carry out the cell switching in the switching process, so that the UE can carry out the efficient and reliable cell switching in the T-SC network.
As will be appreciated by one skilled in the art, embodiments of the present invention may 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 an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present invention may 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 an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A cell switching method of a terminated cell T-SC is characterized by comprising the following steps:
determining a first candidate target T-SC terminal set through an early switching process;
determining a second candidate target T-SC terminal set through a switching process;
sending a switching command to UE (user equipment) so that the UE determines a target T-SC (T-SC) terminal for cell switching according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, wherein the target T-SC terminal comprises the same T-SC terminal in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set;
wherein the early handover procedure comprises periodically performing the following steps within a time-to-trigger TTT:
a source T-SC terminal receives an early switching preparation request message which is sent by the UE and comprises a plurality of candidate target T-SC terminal information, broadcasts and sends the early switching request message to part or all of the candidate target T-SC terminals, and the candidate target T-SC terminals which receive the early switching request message feed back an early switching permission response message to the source T-SC terminal;
the source T-SC terminal establishes a candidate target T-SC terminal list according to the candidate target T-SC terminal which sends the early switching permission response message, and sends an early switching command which comprises the candidate target T-SC terminal list information to the UE;
wherein the determining the first candidate target T-SC terminal set comprises:
after the TTT is finished, taking the T-SC terminal in the candidate target T-SC terminal list as a first candidate target T-SC terminal set;
wherein the determining a second set of candidate target T-SC terminals through a handover procedure comprises:
the source T-SC terminal receives a measurement report which comprises a plurality of candidate target T-SC terminal information and is sent by the UE;
the source T-SC terminal broadcasts and sends a switching request message to the candidate target T-SC terminals, and the candidate target T-SC terminals receiving the switching request message feed back a switching permission response message to the source T-SC terminal;
and the source T-SC terminal determines the second candidate target T-SC terminal set according to the candidate target T-SC terminal sending the switching permission response message, and sends a switching command comprising the second candidate target T-SC terminal set information to the UE.
2. The method according to claim 1, wherein before the step of broadcasting and transmitting an early handover request message by the source T-SC terminal, the method further comprises:
and the source T-SC terminal determines a candidate target T-SC terminal for receiving the early switching request message according to the channel quality, the relative distance and the relative speed between the UE and the T-SC terminal and between the T-SC terminals.
3. The method of claim 1, further comprising:
and the source T-SC terminal broadcasts and sends a resource release message to the T-SC terminals except the target T-SC terminal in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set.
4. A cell switching method of T-SC is characterized by comprising the following steps:
sending an early handover preparation request comprising information of a plurality of candidate target T-SC terminals to a source T-SC terminal so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early handover process;
sending a measurement report including information of a plurality of candidate target T-SC terminals to the source T-SC so that the source T-SC terminal determines a second candidate target T-SC terminal set through a switching process;
determining target T-SC terminals according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, wherein the target T-SC terminals comprise the same T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set;
wherein the early handover procedure comprises periodically performing the following steps within a time-to-trigger TTT:
a source T-SC terminal receives an early switching preparation request message which is sent by UE and comprises a plurality of candidate target T-SC terminal information, broadcasts and sends the early switching request message to part or all of the candidate target T-SC terminals, and the candidate target T-SC terminals which receive the early switching request message feed back an early switching permission response message to the source T-SC terminal;
the source T-SC terminal establishes a candidate target T-SC terminal list according to the candidate target T-SC terminal which sends the early switching permission response message, and sends an early switching command which comprises the candidate target T-SC terminal list information to the UE;
wherein the determining the first candidate target T-SC terminal set comprises:
after the TTT is finished, taking the T-SC terminal in the candidate target T-SC terminal list as a first candidate target T-SC terminal set;
wherein the determining a second set of candidate target T-SC terminals through a handover procedure comprises:
the source T-SC terminal receives a measurement report which comprises a plurality of candidate target T-SC terminal information and is sent by the UE;
the source T-SC terminal broadcasts and sends a switching request message to the candidate target T-SC terminals, and the candidate target T-SC terminals receiving the switching request message feed back a switching permission response message to the source T-SC terminal;
and the source T-SC terminal determines the second candidate target T-SC terminal set according to the candidate target T-SC terminal sending the switching permission response message, and sends a switching command comprising the second candidate target T-SC terminal set information to the UE.
5. The method of claim 4, further comprising:
receiving a switching command sent by the source T-SC terminal;
if the handover command is received successfully, determining a target T-SC terminal for cell handover according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, including: determining a target T-SC terminal from the same T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set;
if the switching command fails to be received, determining a target T-SC terminal according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, including: and determining the target T-SC terminal according to the first candidate target T-SC terminal set.
6. A T-SC terminal, comprising:
a first determining module, configured to determine a first candidate target T-SC terminal set through an early handover process;
a second determining module, configured to determine a second candidate target T-SC terminal set through a handover process;
a handover command sending module, configured to send a handover command to a UE, so that the UE determines a target T-SC terminal according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, where the target T-SC terminal includes a same T-SC terminal in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set;
the first determining module comprises an early handover preparation request receiving submodule, an early handover request broadcast sending submodule and an early handover command sending submodule, wherein the early handover preparation request receiving submodule, the early handover request broadcast sending submodule and the early handover command sending submodule periodically execute the following steps in the TTT to complete the early handover process: the early switching preparation request receiving submodule is used for receiving an early switching preparation request message which is sent by the UE and comprises a plurality of candidate target T-SC terminal information; the early switching request broadcast sending submodule is used for sending an early switching request message to part or all of the candidate target T-SC terminals in a broadcast mode; the early switching command sending submodule is used for receiving an early switching permission response message, establishing a candidate target T-SC terminal list according to a candidate target T-SC terminal sending the early switching permission response message, and sending an early switching command comprising candidate target T-SC terminal list information to the UE;
the first determining module is further configured to, after the TTT is finished, take the T-SC terminals in the candidate target T-SC terminal list as a first candidate target T-SC terminal set;
wherein the second determining module comprises:
a measurement report receiving submodule, configured to receive a measurement report including information of a plurality of candidate target T-SC terminals sent by the UE;
a switching request broadcast sending submodule, configured to broadcast and send a switching request message to the multiple candidate target T-SC terminals, where the candidate target T-SC terminal that receives the switching request message feeds back a switching permission response message to the source T-SC terminal;
a handover command sending sub-module, configured to determine the second candidate target T-SC terminal set according to the candidate target T-SC terminal that sent the handover grant response message, and send a handover command including information of the second candidate target T-SC terminal set to the UE.
7. The T-SC terminal of claim 6, wherein the early handover request broadcast sending sub-module is further configured to determine a candidate target T-SC terminal for receiving the early handover request message according to the channel quality, the relative distance and the relative speed between the UE and the T-SC terminal and between the T-SC terminals.
8. The T-SC terminal of claim 6, further comprising:
and a resource release sending module, configured to broadcast and send a resource release message to the T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set, except the target T-SC terminal.
9. A user device, comprising:
an early handover preparation request sending module, configured to send an early handover preparation request including information of multiple candidate target T-SC terminals to a source T-SC terminal, so that the source T-SC terminal determines a first candidate target T-SC terminal set through an early handover process;
a measurement report sending module, configured to send a measurement report including information of multiple candidate target T-SC terminals to the source T-SC, so that the source T-SC determines a second candidate target T-SC terminal set through a handover process;
a target terminal determining module, configured to determine a target T-SC terminal according to the first candidate target T-SC terminal set and/or the second candidate target T-SC terminal set, where the target T-SC terminal includes a same T-SC terminal in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set;
wherein the early handover procedure comprises periodically performing the following steps within a time-to-trigger TTT:
a source T-SC terminal receives an early switching preparation request message which is sent by UE and comprises a plurality of candidate target T-SC terminal information, broadcasts and sends the early switching request message to part or all of the candidate target T-SC terminals, and the candidate target T-SC terminals which receive the early switching request message feed back an early switching permission response message to the source T-SC terminal;
the source T-SC terminal establishes a candidate target T-SC terminal list according to the candidate target T-SC terminal which sends the early switching permission response message, and sends an early switching command which comprises the candidate target T-SC terminal list information to the UE;
wherein the determining the first candidate target T-SC terminal set comprises:
after the TTT is finished, taking the T-SC terminal in the candidate target T-SC terminal list as a first candidate target T-SC terminal set;
wherein the determining a second set of candidate target T-SC terminals through a handover procedure comprises:
the source T-SC terminal receives a measurement report which comprises a plurality of candidate target T-SC terminal information and is sent by the UE;
the source T-SC terminal broadcasts and sends a switching request message to the candidate target T-SC terminals, and the candidate target T-SC terminals receiving the switching request message feed back a switching permission response message to the source T-SC terminal;
and the source T-SC terminal determines the second candidate target T-SC terminal set according to the candidate target T-SC terminal sending the switching permission response message, and sends a switching command comprising the second candidate target T-SC terminal set information to the UE.
10. The user equipment of claim 9, further comprising:
a switching command receiving module, configured to receive a switching command sent by the source T-SC terminal;
if the switching command is successfully received, the target terminal determining module determines a target T-SC terminal from the same T-SC terminals in the first candidate target T-SC terminal set and the second candidate target T-SC terminal set; and if the switching command fails to be received, the target terminal determining module determines a target T-SC terminal according to the first candidate target T-SC terminal set.
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| CN107148037A (en) * | 2017-07-18 | 2017-09-08 | 宇龙计算机通信科技(深圳)有限公司 | A kind of system of selection, terminal and the server of the small base station of terminated |
| CN108235394B (en) * | 2018-01-03 | 2020-12-04 | 武汉虹信科技发展有限责任公司 | Method and device for switching serving cells |
| WO2020061943A1 (en) * | 2018-09-27 | 2020-04-02 | Oppo广东移动通信有限公司 | Data transmission method, terminal device and network device |
| CN111279747B (en) * | 2018-10-05 | 2022-06-17 | 联发科技股份有限公司 | Switching method with early preparation function and user equipment thereof |
| CN117880907A (en) * | 2019-07-30 | 2024-04-12 | 中兴通讯股份有限公司 | Wireless communication method for mobility control |
| US20230059975A1 (en) * | 2020-01-10 | 2023-02-23 | Lenovo (Beijing) Ltd. | Method of failure handling in conditional handover |
| CN113347621A (en) * | 2020-02-14 | 2021-09-03 | 华为技术有限公司 | Method and device for group switching |
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| CN103763730A (en) * | 2014-02-25 | 2014-04-30 | 重庆邮电大学 | Wireless link failure recovery enhancing method and device based on optimal reconstruction target cell selection |
| CN104581849A (en) * | 2015-01-08 | 2015-04-29 | 重庆邮电大学 | Residential quarter switch method |
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