WO2013102390A1 - 小区间切换的方法及装置 - Google Patents
小区间切换的方法及装置 Download PDFInfo
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- WO2013102390A1 WO2013102390A1 PCT/CN2012/086042 CN2012086042W WO2013102390A1 WO 2013102390 A1 WO2013102390 A1 WO 2013102390A1 CN 2012086042 W CN2012086042 W CN 2012086042W WO 2013102390 A1 WO2013102390 A1 WO 2013102390A1
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- WIPO (PCT)
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- user equipment
- base station
- communication
- target cell
- handover command
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
Definitions
- the present invention relates to the field of communications, and in particular, to a method and apparatus for inter-cell handover. Background technique
- UEs User Equipments
- the base station schedules radio resources in the cell, and the user data sent by the UE passes through the base station to the core network. Then, it is sent to the base station where the target UE is located, and finally the user data is sent to the target UE by the base station where the target UE is located.
- D2D Dev i ce to Dev i ce, direct communication between devices
- D2D technology user data is directly transmitted from one UE to another without going through the base station and the core network. The communication can be directly established between two or more UEs that are close to each other, which reduces the load of the macro network and saves radio resources.
- Embodiments of the present invention provide a method and apparatus for inter-cell handover, which enables a UE in a D2D communication state to simultaneously handover to a target cell and maintain current D2D communication.
- an embodiment of the present invention provides a method for inter-cell handover, including: The first user equipment reports a measurement report to the source base station, where the measurement report is used by the source base station to determine whether the first user equipment and the second user equipment that are currently performing direct inter-device D2D communication can be synchronously switched to the target cell. ;
- the first user equipment switches from the source cell belonging to the source base station to the target cell, and continues to perform D2D communication with the second user equipment in the target cell.
- the embodiment of the present invention further provides a method for inter-cell handover, including: determining, according to a measurement report reported by the first user equipment and the second user equipment, that the first user equipment that directly performs D2D communication between devices is Whether the second user equipment can synchronously switch to the target cell;
- the first user equipment and the second user equipment can be synchronously switched to the target cell, send a handover command to at least one of the first user equipment and the second user equipment, to indicate the first user equipment and the first user equipment.
- the two user equipments synchronously switch to the target cell and continue D2D communication in the target cell.
- the embodiment of the present invention further provides a user equipment, including:
- a reporting unit configured to report a measurement report to the source base station, where the measurement report is used by the source base station to determine whether the current user equipment and the second user equipment that performs direct communication between the device and the current user equipment for D2D communication can synchronously switch to the target Community
- a switching unit configured to: when receiving the handover command, switch from the source cell of the source base station to the target cell, and continue to perform D2D communication with the second user equipment in the target cell.
- an embodiment of the present invention further provides a base station, including:
- a first processing unit configured to determine, according to the measurement report reported by the first user equipment, whether the first user equipment and the second user equipment that are currently performing direct communication between devices and D2D communication can be synchronously switched to the target cell;
- a second sending unit configured to send a switching command to at least one of the first user equipment and the second user equipment when the first user equipment and the second user equipment can be synchronously switched to the target cell, to indicate The first user equipment and the second user equipment are synchronously switched to the target cell, and The target cell continues D2D communication.
- the UE currently performing D2D communication sends its detection report to the source base station; when the detection report meets the preset handover condition, the source base station sends a handover command to the UE.
- the method provided by the embodiment of the present invention enables the two or more UEs that are performing D2D communication to continue to maintain the current D2D communication in the target cell after switching to the target cell.
- FIG. 1 is a schematic flowchart of a method according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic flowchart of a method according to Embodiment 2 of the present invention.
- FIG. 3 is a schematic flowchart of a method according to Embodiment 3 of the present invention.
- Embodiment 4 is a schematic flowchart of a method according to Embodiment 4 of the present invention.
- FIG. 5-8 is a schematic structural diagram of a user equipment according to Embodiment 5 of the present invention.
- FIG. 9-1 is a schematic structural diagram of a base station according to Embodiment 6 of the present invention. detailed description
- Example 1 The embodiment of the invention provides a method for switching between cells. As shown in FIG. 1 , the method includes:
- the UE1 reports a measurement report to the source base station, where the measurement report is used by the source base station to determine whether UE1 and UE2 that are currently performing D2D communication can switch to the target cell synchronously.
- the measurement report is used by the source base station to determine whether the UE1 can be handed over to the target cell, and whether the UE1 and the UE2 can synchronously switch to the target cell, and the measurement report may include measurement information of the neighboring cell of the UE1.
- the embodiment of the present invention is described by taking two UEs as the D2D communication as an example.
- the number of user equipments for D2D communication in the actual application may be multiple, which is not limited herein.
- the UE1 When receiving the handover command, the UE1 switches from the source cell belonging to the source base station to the target cell, and continues D2D communication with the UE2 in the target cell.
- the UE may switch to the target cell synchronously with another UE that performs D2D communication with the UE.
- the UE reports the measurement report to the source base station, and when the UE receives the handover command, it switches to the target cell, and continues to perform D2D communication with another UE currently performing D2D communication in the target cell.
- the method provided by the embodiment of the present invention enables the UE that is performing D2D communication to continue to maintain the current D2D communication in the target cell after switching to the target cell.
- the embodiment of the present invention provides a method for inter-cell handover. As shown in FIG. 2, the method includes: 201.
- the base station determines, according to the measurement report reported by the UE1 and the UE2, whether the UE1 and the UE2 that are currently performing D2D communication can be synchronously switched to Target cell.
- the measurement report may include measurement information of a neighboring cell of the UE that is performing D2D communication, and other information such as path loss information between two or more UEs that are performing D2D communication, but is not limited thereto. this.
- the base station may determine, according to the measurement report reported by the UE, whether the UE can switch to the destination.
- the target cell, and the UE currently performing D2D communication can synchronously handover to the target cell.
- the base station determines whether the current D2D communication UE can simultaneously switch to the target cell, but is not limited to the following methods:
- the current D2D communication UE can simultaneously switch to the target cell, it is necessary to refer to the measurement report of all UEs of the current D2D communication, and all the UEs currently in the D2D communication can be synchronously switched to the target cell, and the D2D communication can be synchronously switched. Go to the target cell.
- the synchronous handover is that two UEs switch to the same target cell in the same or similar time; if the handover time is different, it is not synchronous handover.
- the similar time can be determined by a person skilled in the art according to the actual application environment, which can be less than the preset time threshold. For example, the base station determines that both the UE1 and the UE2 can be switched to the same target cell, and then the handover command is sent.
- the transmission time of the two handover commands is not significantly different, and may be less than a certain threshold, which may be set by a person skilled in the art, so that UE1 and UE2 are in the Switching to the target cell in the same or similar time, this switching mode is synchronous switching.
- the base station determines that the UE1 can be handed over to the target cell, and sends a handover command to the UE1, the UE1 completes the handover; the base station then determines that the UE2 can handover to the target cell, and then sends a handover command to the UE2, causing the UE1 and the UE2 to switch to the target cell at a larger interval. , it is not a synchronous switch.
- the base station sends a handover command to the at least one of the UE1 and the UE1 to indicate that the UE1 and the UE2 are synchronously switched to the target cell. And continuing D2D communication in the target cell.
- the embodiment of the present invention is described by taking two UEs as the D2D communication as an example.
- the number of user equipments for D2D communication in the actual application may be multiple, which is not limited herein.
- the base station detects the mobility of the UE according to the measurement report sent by the UE that is performing the D2D communication; when the handover condition is met, the base station sends a handover command to the UE to indicate that the D2D communication is being performed.
- One or more UEs are synchronously handed over to the target cell.
- the method provided by the embodiment of the present invention enables the two or more UEs that are performing D2D communication to continue to maintain the current D2D communication in the target cell after switching to the target cell.
- the embodiment of the invention provides a method for inter-cell handover. As shown in FIG. 3, the method includes:
- the D2D communication may be a voice call, share data, or send a file, etc., but is not limited thereto.
- the embodiment of the present invention is described by taking two UEs for performing D2D communication, and the two UEs are marked as UE1 and UE2. It is worth noting that the number of UEs performing D2D communication in actual applications is not limited to two.
- the UE1 and the UE2 respectively measure the neighboring cell and the current D2D communication, and report the measurement report according to the measurement result.
- the measurement includes, but is not limited to, measurement results of the two neighboring cells, and path loss information between the UE1 and the UE2.
- the measurement report may further include location information where the UE 1 and the UE 2 are located.
- the source base station receives the measurement report sent by the UE1 and the UE2, and performs a handover decision according to the measurement report to determine the target base station. If the source base station determines that the target base station to which the UE1 and the UE2 need to be handed over is the same target base station, it is necessary to further determine whether the UE1 and the UE2 can be synchronously handed over to the target cell, and whether the D2D communication between the UE1 and the UE2 can be synchronously switched to the target cell, etc. .
- the source base station may determine, according to the neighbor cell measurement information, the D2D measurement information, and the location information of the UE, in the measurement report, whether UE1 and UE2 can synchronously switch to the target cell. For example: If the relative position between the two UEs is unchanged or does not change much (ie, the relative positions of the two UEs are still within the communication range of the D2D), the D2D communication condition is still satisfied, and the source base station determines that both UEs need to switch. To the same target cell, the source base station can make a decision for the two UEs to synchronously switch to the target cell and maintain D2D communication.
- the base station may also use the UE location information measured by the base station side.
- the source base station sends handover request signaling to the target base station, where the handover request signaling includes UE1.
- the D2D context information of the UE2 may include a D2D communication period, a D2D measurement result, a synchronization handover request, and the like, where the synchronization handover request is used to notify the target base station UE1 and the UE2 that the handover needs to be synchronously performed to the target base station, and D2D communication continues after switching to the target base station.
- the handover request signaling of the UE1 and the UE2 may be combined into one signaling and sent to the target base station, or may be separately sent to the target base station.
- the target base station performs admission control on UE1 and UE2. If the access is successful, the target base station configures the handover resources required for completing the inter-cell handover for the UE1 and the UE2, and returns a response message of the handover request signal to the source base station, where the response message includes the handover resource configured by the target base station for UE1 and UE2.
- the handover resource includes a dedicated random access preamble (Random Acce ss Preamb le ) configured by the target base station for UE1 and UE2, and a D2D C-RNTI reserved for UE1 and UE2 (D2D Ce l l-Rad io Ne twork Temporary Ident i ty , D2D cell wireless network temporary identification).
- a dedicated random access preamble Random Acce ss Preamb le
- D2D C-RNTI reserved for UE1 and UE2
- the target base station may determine, according to the D2D context information sent by the source base station, whether the D2D communication between the UE1 and the UE2 can continue in the local cell, generate corresponding indication information, and carry the response message in the handover request signaling to send Give the source base station.
- the target base station may carry the handover resource of the two UEs of the UE1 and the UE2 in a response message of the handover request signaling.
- the signal is sent to the source base station, and the handover resources of the UE1 and the UE2 are respectively carried in the response message of the two handover request signalings and sent to the source base station.
- the source base station After receiving the response message of the handover request signaling, the source base station sends a handover command to UE1 and UE2 to instruct UE1 and UE2 to switch from the source base station to the target base station.
- the handover command may include a synchronization handover instruction and a D2D C-RNTI reserved by the target base station for UE1 and UE2, where the synchronization handover instruction is used to indicate that UE1 and UE2 are synchronously handed over to the target base station, and are switched to the target base station. Continue D2D communication.
- the handover command may further include a D2D communication parameter required for D2D communication.
- the D2D communication parameters include: a D2D communication cycle and a D2D C-RNTI, but are not limited thereto.
- the target can also be After the UE completes the handover, the base station configures the D2D communication parameters for the UE1 and the UE2, and the D2D communication parameters are carried in the scheduling information and sent to the UE1 and the UE2.
- UE1 and UE2 After receiving the handover command, UE1 and UE2 respectively synchronize with the target base station, and send a dedicated random access preamble (Random Acces s Preamble) to the target base station to obtain random access response information returned by the target base station.
- a dedicated random access preamble Random Acces s Preamble
- the target base station returns random access response information to UE1 and UE2, where the random access response message carries a TA (Timing Advance) value configured by the target base station for UE1 and UE2.
- TA Timing Advance
- the target base station may also send the TA value of any one UE (for example, UE2) to another UE (for example, UE1), and the UE1 forwards the TA value of the UE2 to the UE2.
- the target base station may also send scheduling information.
- the TA value of UE2 is sent to UE2.
- the target base station may negotiate with the source base station, so that the handover command sent by the source base station to any one of the UEs (for example, UE2) carries a first instruction, where the first instruction is used to indicate that the UE2 does not need to perform a random access procedure;
- UE2 determines that the random access procedure does not need to be performed, and only needs to listen to the downlink scheduling information.
- UE1 and UE2 receive the handover command, UE1 sends a random access preamble to the target base station, and UE2 does not need to transmit; the target base station only sends a response message of the random access preamble to UE1.
- the UE2 can directly use the TA value of the UE1, or the target base station can calculate the TA value of the UE2 by using the location information of the UE, the path loss information of the D2D, and the like, and carry the TA value of the UE2 in the random access response message sent to the UE1.
- the UE1 is forwarded to the UE2, and the TA value configured for the UE2 is carried in the scheduling information and sent to the UE2.
- the UE2 when the source base station indicates that a single UE (for example, UE1) performs random access, the UE2 sends a handover complete message to the target base station after receiving the TA value forwarded by the UE1. If UE2 does not receive the TA value forwarded by UE1, only UE1 can send a handover complete message.
- a single UE for example, UE1
- the target base station performs necessary resource scheduling for D2D communication of UE1 and UE2, and is UE1 and
- the UE2 configures scheduling information of the D2D communication, and the scheduling information includes information such as time-frequency resources used by the D2D communication.
- the target base station may include the TA information of the UE2 in the scheduling information.
- UE1 and UE2 receive scheduling information of D2D communication sent by the target base station.
- UE1 and UE2 continue to perform D2D communication in the target cell according to the scheduling information.
- the UE2 may supplement the sending of the handover complete message to the target base station before the D2D communication.
- the inter-cell handover includes inter-cell handover in the base station and inter-cell handover between the base stations.
- the source base station and the target base station are the same base station.
- the target cell is the cell of the source base station itself, and the UE of the D2D communication is equivalent to implementing handover between different cells of the source base station.
- the UE detects the current D2D communication, determines a detection report according to the detection result, and sends the detection report to the source base station; when the detection report meets the preset switching condition
- the source base station sends a handover command to the UE to instruct the UE to handover to the target cell.
- the method provided by the embodiment of the present invention enables the UE that is performing D2D communication to continue to maintain the current D2D communication and improve the user experience after switching to the target cell.
- the embodiment of the present invention provides a method for inter-cell handover. As shown in FIG. 4, the method includes: Steps 401-405 are the same as steps 301-305 in Embodiment 3, and are not further described herein.
- the source base station After receiving the response message of the handover request signaling, the source base station sends a handover command to any one of the UEs (which may be UE1 or UE2, in this embodiment, for example, UE1), to indicate that the UE1 is switched from the source base station. To the target base station.
- the UEs which may be UE1 or UE2, in this embodiment, for example, UE1
- the handover command may include a forwarding identifier and a synchronization switching instruction, where the forwarding identifier is used to indicate that any one of the UEs forwards the received handover command to the current D2D communication.
- the remaining UEs of the signaling state are used to indicate that two or more UEs currently in the D2D communication state simultaneously switch to the target base station and continue D2D communication.
- the source base station may carry the difference parameter in the handover command sent to the UE1, and the UE1 forwards the difference parameter to the UE2.
- the UE1 After receiving the handover command, the UE1 forwards a handover command to the UE2 according to the forwarding identifier, where the handover command includes information such as a C-RNTI and a random access parameter configured by the target base station for the UE2.
- UE1 and UE2 respectively synchronize with the target base station according to the handover command, send a random access preamble to the target base station, and receive a response message returned by the target base station to obtain a TA value.
- the TA value of the other UE may be forwarded by the UE performing the random access procedure, or may be carried by the target base station in the scheduling information.
- the specific process refer to Embodiment 3 .
- UE1 and UE2 can also access the target base station by using a competitive access mode.
- the target base station After receiving the random access preamble, the target base station returns a response message of the random access preamble to the UE1 and the UE2, where the response message includes a TA value configured by the target base station for UE1 and UE2.
- the UE1 After the UE1 and the UE2 successfully access the target base station, the UE1 sends a Handover Complete message to the target base station.
- the target base station configures scheduling information of the D2D communication for the UE1 and the UE2, where the scheduling information includes a D2D communication parameter, and the D2D communication parameter includes information such as a time-frequency resource used by the D2D communication.
- UE1 and UE2 receive scheduling information of D2D communication sent by the target base station.
- UE1 and UE2 continue D2D communication in the target cell according to the scheduling information.
- the inter-cell handover includes inter-cell handover in the base station and inter-cell handover between the base stations.
- the source base station and the target base station are the same base station.
- the source base station may separately send the handover signaling To a UE, the UE forwards the handover signaling to the remaining UEs in the D2D communication state to complete the inter-cell handover.
- the method provided by the embodiment of the present invention can not only enable the UE that is performing D2D communication to switch to the target cell, but also maintain the current D2D communication in the target cell, and can also save the signaling overhead of the base station.
- the embodiment of the present invention provides a UE, which can implement the method of the UE side in the foregoing method embodiment.
- the UE includes an upper unit 51 and a switching unit 52, where:
- the reporting unit 51 is configured to report a measurement report to the source base station, where the measurement report is used by the source base station to determine whether the current user equipment and the UE2 that performs D2D communication with the current user equipment can be switched to the target cell in synchronization;
- the switching unit 52 is configured to, when receiving the handover command, switch from the source cell of the source base station to the target cell, and continue D2D communication with the UE2 in the target cell.
- the UE further includes a measuring unit 53 and a receiving unit 54, where:
- the measuring unit 53 is configured to measure the neighboring cell of the current UE and the D2D communication, and determine a measurement according to the measurement result, where the measurement report includes the measurement information of the current UE neighboring cell and the path loss between the current UE and the UE2.
- the receiving unit 54 is configured to receive a handover command, where the handover command includes a synchronization handover instruction, where the synchronization handover instruction is used to indicate that the current UE and the UE2 are synchronously handed over to the target cell, and the D2D communication is continued in the target cell.
- the handover command received by the receiving unit 54 further includes a D2D communication parameter configured by the source base station for the current UE, where the D2D communication parameter is used by the current UE to continue D2D communication in the target cell, where the D2D communication parameter includes D2D. Communication cycle and D2D C-RNTI.
- the receiving unit 54 is specifically configured to receive the handover command from the source base station, or the receiving unit 54 may be further configured to receive the handover command forwarded by the UE2.
- the handover command received by the receiving unit 54 further includes a forwarding identifier, where the forwarding identifier is used to indicate that the current UE forwards the handover command to the UE. 2 ;
- the UE further includes a first sending unit 55, configured to send a handover command to the UE2 to instruct the UE2 to switch to the target cell.
- the switching command received by the receiving unit 54 may further include a first instruction, where the first instruction is used to indicate that the current UE does not need to perform a random access procedure;
- the UE further includes a first acquiring unit 56, configured to acquire a TA value from the UE2, and send uplink data to the target base station to which the target cell belongs according to the TA value, to notify the target base station of the current The UE has completed the handover; or
- the first obtaining unit 56 is further configured to: obtain a TA value from the scheduling information of the target base station, and send uplink data to the target base station according to the TA value, to notify the target base station that the current UE has completed the handover.
- the UE provided by the embodiment of the present invention reports the measurement report to the source base station by the reporting unit 51, where the measurement report is used by the source base station to determine whether the current UE can be handed over to the target cell; when receiving the handover command, the handover is performed.
- Unit 52 switches to the target cell where D2D communication continues.
- the base station provided by the embodiment of the present invention can enable the UE that is performing D2D communication to continue to maintain the current D2D communication in the target cell after switching to the target cell.
- the embodiment of the present invention provides a base station, which can implement the method of the base station side in the foregoing method embodiment.
- the base station includes a first processing unit 91 and a second sending unit 92, where: the first processing unit 91 is configured to determine, according to the measurement report reported by the UE1 and the UE2, whether the UE1 and the UE2 that are currently performing D2D communication can be synchronously switched to the target cell;
- the second sending unit 92 is configured to: when the UE1 and the UE2 can synchronously switch to the target cell, send a handover command to the at least one of the UE1 and the UE2, to indicate that the UE1 and the UE2 are synchronously switched to the target cell, And continuing D2D communication in the target cell.
- the base station further includes a second acquiring unit 93, configured to acquire measurement reports reported by the UE1 and the UE2, where the measurement report includes measurement information of a neighboring cell of the UE1, and a neighboring cell of the UE2. Measurement information and path loss information between UE1 and UE2.
- the handover command further includes a forwarding identifier, where the forwarding identifier is used to indicate that the UE1 that receives the handover command is currently performing D2D communication.
- UE2 forwards the handover command;
- the handover command further includes a forwarding identifier, where the forwarding identifier is used to indicate that the UE2 that received the handover command forwards the handover command to the UE2 that is currently performing D2D communication. .
- the handover command sent by the second sending unit 92 carries a D2D communication parameter, where the D2D communication parameter is used by the UE1 and/or the UE2 to continue D2D communication in the target cell, where the D2D communication parameter includes a D2D communication cycle and D2D C-RNTI;
- the base station further includes:
- the third sending unit 94 is configured to send, to the target base station to which the target cell belongs, handover request signaling, where the handover request signaling carries the D2D communication parameter, and is used to indicate that the target base station is configured according to the D2D communication parameter.
- UE1 and/or UE2 perform D2D communication scheduling.
- the base station provided by the embodiment of the present invention, when the UE performing the D2D communication needs to perform the inter-cell handover, the first processing unit 91 determines whether the UE can be handed over to the target cell according to the measurement report reported by the UE; When switching to the target cell, the second sending unit 92 sends a handover command to the UE to instruct the UE to synchronously handover to the target cell, and continues D2D communication in the target cell.
- the base station provided by the embodiment of the present invention can enable the two or more UEs that are performing D2D communication to continue to maintain the current D2D communication after switching to the target cell; the base station can also be in the A single UE in the D2D communication sends a handover command to complete the inter-cell handover, which can save the signaling overhead of the base station.
- the embodiment of the present invention further provides a system for inter-cell handover, including the UE described in FIG. 5-8 and the base station described in FIG. 9-1, which can enable the UE performing D2D communication to maintain the handover to the neighboring cell. D2D communication.
- the present invention can be implemented by means of software plus necessary general hardware, and of course, can also be through hardware, but in many cases the former is a better implementation. .
- the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
- a hard disk or optical disk or the like includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
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Abstract
一种小区间切换的方法、装置及系统,涉及通信领域,用于解决进行D2D通信的UE切换到相邻小区后D2D通信中断的问题。本发明提供的方法包括:第一用户设备向源基站上报测量报告,所述测量报告用于供所述源基站判决当前进行设备间直接通信D2D通信的所述第一用户设备与第二用户设备是否能够同步切换至目标小区;当接收到切换命令时,所述第一用户设备从属于源基站的源小区切换至目标小区,在所述目标小区继续与第二用户设备进行D2D通信。本发明适用于通信领域,用于实现D2D通信的小区间切换。
Description
小区间切换的方法及装置
本申请要求于 2012 年 1 月 5 日提交中国专利局、 申请号为 201210002055.7、 发明名称为"小区间切换的方法及装置 "的中国专利申请的优 先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信领域, 尤其涉及一种小区间切换的方法及装置。 背景技术
在传统的蜂窝移动通信网络中, UE ( User Equi pment , 用户设备)之间进 行通信时需要通过基站集中控制, 由基站对小区内的无线资源进行调度, UE 发送的用户数据通过基站到核心网, 然后发送到目标 UE所在的基站, 最后再 通过目标 UE所在的基站将该用户数据发送到目标 UE。
在传统的蜂窝网络中, 即使是两个距离非常近的 UE之间进行通信时, 用 户数据也需要经过基站和核心网。但是随着蜂窝网络的迅速发展,很多地区的 网络容量已经接近饱和。 为了减轻宏网络的负载, 可以釆用 D2D ( Dev i ce to Dev i ce , 设备间直接通信)技术, 在 D2D技术中, 用户数据直接从一个 UE传 输到另一个 UE , 不经过基站和核心网, 可在距离较近的两个或多个 UE之间直 接建立通信, 减轻宏网络的负载, 节省无线资源。
由于目前的 D2D技术还不成熟, 仅支持在同一小区内的两个或多个 UE之 间进行通信; 当两个或多个 UE同时切换到另一个小区时, 会导致 UE间的 D2D 通信中断。
发明内容
本发明的实施例提供一种小区间切换的方法及装置, 能够使得处于 D2D 通信状态下的 UE同时切换到目标小区并保持当前 D2D通信。
为达到上述目的, 本发明的实施例釆用如下技术方案:
一方面, 本发明实施例提供了一种小区间切换的方法, 包括:
第一用户设备向源基站上报测量报告,所述测量报告用于供所述源基站判 决当前进行设备间直接通信 D2D通信的所述第一用户设备与第二用户设备是 否能够同步切换至目标小区;
当接收到切换命令时,所述第一用户设备从属于源基站的源小区切换至目 标小区, 在所述目标小区继续与第二用户设备进行 D2D通信。
另一方面, 本发明实施例还提供了一种小区间切换的方法, 包括: 根据第一用户设备和第二用户设备上报的测量报告判断当前进行设备间 直接通信 D2D 通信的第一用户设备与第二用户设备是否能够同步切换至目标 小区;
当所述第一用户设备与第二用户设备能够同步切换至目标小区时,向所述 第一用户设备与第二用户设备中的至少一个发送切换命令,以指示所述第一用 户设备与第二用户设备同步切换至目标小区, 并在所述目标小区继续进行 D2D 通信。
再一方面, 本发明实施例还提供了一种用户设备, 包括:
上报单元, 用于向源基站上报测量报告, 所述测量报告用于供所述源基站 判决当前用户设备以及与当前用户设备进行设备间直接通信 D2D通信的第二 用户设备是否能够同步切换至目标小区;
切换单元, 用于当接收到切换命令时,从所述源基站的源小区切换至目标 小区, 在所述目标小区继续与所述第二用户设备进行 D2D通信。
又一方面, 本发明实施例还提供了一种基站, 包括:
第一处理单元,用于根据第一用户设备上报的测量报告判断当前进行设备 间直接通信 D2D通信的第一用户设备与第二用户设备是否能够同步切换至目 标小区;
第二发送单元,用于当所述第一用户设备与第二用户设备能够同步切换至 目标小区时, 向所述第一用户设备与第二用户设备中的至少一个发送切换命 令, 以指示所述第一用户设备与所述第二用户设备同步切换至目标小区, 并在
所述目标小区继续进行 D2D通信。
本发明实施例提供的小区间切换的方法及装置, 由当前进行 D2D 通信的 UE 将其检测报告发送到源基站; 当所述检测报告满足预设的切换条件时, 源 基站向 UE发送切换命令以指示 UE切换至目标小区。 与现有技术相比, 本发明 实施例提供的方法能够使得正在进行 D2D通信的两个或多个 UE切换至目标小 区后, 在目标小区继续保持当前的 D2D通信。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地, 下面描述 中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲, 在不付 出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例 1提供的方法的流程示意图;
图 2为本发明实施例 2提供的方法的流程示意图;
图 3为本发明实施例 3提供的方法的流程示意图;
图 4为本发明实施例 4提供的方法的流程示意图;
图 5-8为本发明实施例 5提供的用户设备的结构示意图;
图 9-1 1为本发明实施例 6提供的基站的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 实施例 1
本发明实施例提供了一种小区间切换的方法,如图 1所示,所述方法包括:
1 01、 UE1 向源基站上报测量报告, 所述测量报告用于供所述源基站判决 当前进行 D2D通信的 UE1与 UE2是否能够同步切换至目标小区。
具体的,所述测量报告用于供所述源基站判决 UE1是否能够切换至目标小 区、 以及所述 UE1和 UE2是否能够同步切换至目标小区, 所述测量报告可以包 括 UE1相邻小区的测量信息、 UE2相邻小区的测量信息, 以及 UE1和 UE2之间 的路损信息等。
值得说明的是,本发明实施例是以 2个 UE进行 D2D通信为例进行说明的 , 实际应用中进行 D2D通信的用户设备可以是多个, 此处不做限定。
1 02、 当接收到切换命令时, UE1从属于源基站的源小区切换至目标小区, 在所述目标小区继续与 UE2进行 D2D通信。
也就是说, 当该 UE收到该同步切换命令后, 可与同其进行 D2D通信的另 — UE同步切换至目标小区。
本发明实施例提供的方法, UE向源基站上报测量报告, 当 UE接收到切换 命令时切换至目标小区, 在所述目标小区继续与当前进行 D2D 通信的另一个 UE进行 D2D通信。 与现有技术相比, 本发明实施例提供的方法能够使得正在 进行 D2D通信的 UE切换至目标小区后,在目标小区继续保持当前的 D2D通信。 实施例 2
本发明实施例提供了一种小区间切换的方法,如图 2所示,所述方法包括: 201、 基站根据 UE1和 UE2上报的测量报告判断当前进行 D2D通信的 UE1 和 UE2是否能够同步切换至目标小区。
具体的, 所述测量^艮告可以包括正在进行 D2D通信的 UE的相邻小区的测 量信息,以及正在进行 D2D通信的两个或多个 UE之间的路损信息等其他信息, 但不仅限于此。
具体的,基站可以根据 UE上报的测量报告判决所述 UE是否能够切换至目
标小区、 以及当前进行 D2D通信的 UE是否能够同步切换至目标小区。 基站判 断当前 D2D通信的 UE是否能够同时切换到目标小区可以釆用但不限于如下方 法:
判断当前 D2D通信的 UE是否能够同时切换到目标小区,需要参考当前 D2D 通信的所有 UE的测量报告,需要满足当前处于该 D2D通信的所有 UE都能够同 步切换到目标小区, D2D通信才能够同步切换到目标小区。
值得说明的, 所述同步切换是两个 UE在相同或相近的时间内切换到相同 的目标小区; 如果切换时间差别较大, 则不是同步切换。 所述相近的时间可由 本领域技术人员依照实际应用环境确定, 其可以小于预设时间门限。 例如: 基 站判决 UE1和 UE2都可以切换到相同的目标小区, 然后发送切换命令, 两个切 换命令的发送时间差别不大, 可以小于一定门限, 具体可由本领域技术人员设 置,从而 UE1和 UE2在相同或相近的时间内切换到目标小区, 这种切换方式就 是同步切换。 如果基站判决 UE1可以切换到目标小区, 向 UE1发送切换命令, UE1完成切换; 然后基站判决 UE2可以切换到目标小区, 再向 UE2发送切换命 令, 导致 UE1和 UE2切换至目标小区的时间间隔较大, 则不属于同步切换。
202、当所述正在进行 D2D通信的 UE1和 UE2能够同步切换至目标小区时, 基站向所述 UE1和 UE1中的至少一个 UE发送切换命令,以指示所述 UE1和 UE2 同步切换至目标小区, 并在所述目标小区继续进行 D2D通信。
值得说明的是,本发明实施例是以 2个 UE进行 D2D通信为例进行说明的 , 实际应用中进行 D2D通信的用户设备可以是多个, 此处不做限定。
本发明实施例提供的方法, 基站根据正在进行 D2D通信的 UE发送的测量 报告对该 UE的移动性进行检测;当满足切换条件时,基站向 UE发送切换命令, 以指示正在进行 D2D通信的两个或多个 UE同步切换至目标小区。 与现有技术 相比, 本发明实施例提供的方法能够使得正在进行 D2D通信的两个或多个 UE 切换至目标小区后, 在目标小区继续保持当前的 D2D通信。
实施例 3
本发明实施例提供了一种小区间切换的方法,如图 3所示,所述方法包括:
301、 两个或多个距离较近的 UE之间进行 D2D通信。
具体的, 所述 D2D通信可以是语音通话、 共享数据或发送文件等, 但不仅 限于此。
为了便于理解, 本发明实施例以 2个 UE进行 D2D通信为例进行说明, 所 述 2个 UE标记为 UE1和 UE2。 值得说明的是, 实际应用中进行 D2D通信的 UE 不仅限于 2个。
302、 UE1和 UE2分别对相邻小区以及当前 D2D通信进行测量, 并分别根 据测量结果上报测量报告。
具体的, 所述测量^艮告包括但不限于: 这两个 UE相邻小区的测量结果, 以及 UE1和 UE2之间的路损信息。
可选的, 所述测量^艮告还可以包括 UE 1和 UE 2所处的位置信息。
303、 源基站接收 UE1和 UE2发送的测量报告, 根据所述测量报告做切换 判决,确定目标基站。如果源基站判决 UE1和 UE2需要切换到的目标基站为同 一目标基站, 则需要进一步确定 UE1和 UE2是否能够同步切换到目标小区, 以 及 UE1和 UE2之间的 D2D通信是否能够同步切换到目标小区等。
具体的,源基站可以根据测量报告中的相邻小区测量信息、 D2D测量信息、 以及 UE所处的位置信息等来判决 UE1和 UE2是否能够同步切换到目标小区。 例如: 如果两个 UE之间的相对位置不变或变化不大(即两个 UE的相对位置依 然在 D2D的通信范围内), D2D通信条件依然满足, 并且源基站判定两个 UE都 需要切换到同一个目标小区, 这样源基站就可以做出判决让两个 UE同步切换 到目标小区并保持 D2D通信。
值得说明的是, 如果 UE的测量报告中没有携带位置信息, 基站也可以使 用基站侧测量的 UE位置信息。
304、源基站向目标基站发送切换请求信令,所述切换请求信令中包括 UE1
和 UE2的 D2D上下文信息, 所述 D2D上下文信息可以包括 D2D通信周期、 D2D 测量结果以及同步切换请求等, 其中, 所述同步切换请求用于通知目标基站 UE1和 UE2需要同步切换至目标基站, 并在切换至目标基站后继续 D2D通信。
需要说明的是, 上述 UE1和 UE2的切换请求信令, 源基站可以合并为一条 信令发送给目标基站, 也可以分别发送给目标基站。
305、 目标基站对 UE1和 UE2进行准入控制。 如果准入成功, 目标基站为 UE1和 UE2配置完成小区间切换需要的切换资源, 并向源基站返回切换请求信 令的响应消息, 所述响应消息包括目标基站为 UE1和 UE2配置的切换资源。
具体的,所述切换资源包括目标基站为 UE1及 UE2配置的专用随机接入前 导码(Random Acce s s Preamb le ), 以及为 UE1和 UE2预留的 D2D C-RNTI ( D2D Ce l l-Rad i o Ne twork Temporary Ident i ty , D2D小区无线网络临时标识)。
值得说明的, 目标基站可以根据源基站发送的 D2D 上下文信息判断 UE1 和 UE2之间的 D2D通信是否可以在本小区继续进行,生成相应的指示信息并携 带在切换请求信令的响应消息中以发送给源基站。
值得说明的是,如果目标基站接收的切换请求信令中包含 UE1和 UE2两个 UE的上下文信息, 则目标基站可以将 UE1和 UE2两个 UE的切换资源携带在一 个切换请求信令的响应消息中发送给源基站,也可以将 UE1和 UE2的切换资源 分别携带在两个切换请求信令的响应消息中发送给源基站。
306、 源基站接收到所述切换请求信令的响应消息后, 向 UE1和 UE2发送 切换命令, 以指示 UE1和 UE2从源基站切换至目标基站。
其中, 所述切换命令中可以包括同步切换指令以及目标基站为 UE1和 UE2 预留的 D2D C-RNTI , 所述同步切换指令用于指示 UE1和 UE2同步切换至目标 基站, 并在切换至目标基站后继续进行 D2D通信。
可选的 ,所述切换命令还可以包括 D2D通信需要的 D2D通信参数。具体的 , 所述 D2D通信参数包括: D2D通信周期以及 D2D C-RNTI , 但不仅限于此。
值得说明的是, 当切换命令中不包括所述 D2D通信参数时,也可以由目标
基站在 UE切换完成之后, 分别为 UE1和 UE2配置 D2D通信参数, 并可以将所 述 D2D通信参数携带在调度信息中发送给 UE1和 UE2。
307、 UEl和 UE2接收到所述切换命令后, 分别与目标基站进行同步, 向 目标基站发送专用随机接入前导码(Random Acces s Preamb le ), 以获取目标 基站返回的随机接入响应信息。
308、 目标基站向 UE1和 UE2返回随机接入响应信息, 所述随机接入响应 消息中携带有目标基站为 UE1和 UE2配置的 TA (Timing Advance,定时提前量) 值。
可选的, 目标基站也可以将任意一个 UE (例如 UE2 ) 的 TA值发送给另一 个 UE (例如 UE1 ) , 由 UE1将取 UE2的 TA值转发给 UE2 ; 也可以由目标基站在 发送调度信息的时候将 UE2的 TA值发送给 UE2。
具体的, 目标基站可以通过和源基站协商, 以使得源基站向任意一个 UE (例如 UE2 )发送的切换命令中携带第一指令, 所述第一指令用于指示 UE2无 需执行随机接入过程; UE2在收到切换命令后,确定不需要执行随机接入过程, 只需要监听下行调度信息。 UE1和 UE2接收到切换命令后, UE1向目标基站发 送随机接入前导码, UE2无需发送; 目标基站仅向 UE1发送随机接入前导码的 响应消息。 UE2可以直接使用 UE1的 TA值, 或者目标基站可以通过 UE的位置 信息、 D2D的路损信息等计算 UE2的 TA值,并将 UE2的 TA值携带在发送给 UE1 的随机接入响应消息中, 由 UE1转发给 UE2 ; 也可以在 UE2接入目标基站后, 将为 UE2配置的 TA值携带于调度信息中下发给 UE2。
309、 UEl和 UE2成功接入目标基站后,向目标基站发送切换完成( Handover Comp le te ) 消息。
可选的, 当源基站指示单独一个 UE (例如 UE1 )进行随机接入时, UE2在 接收到 UE1转发的 TA值之后, UE2向目标基站发送切换完成消息。 如果 UE2 没有收到 UE1转发的 TA值, 则只有 UE1能发送切换完成消息。
310、 目标基站为 UE1和 UE2的 D2D通信进行必要的资源调度, 为 UE1和
UE2配置 D2D通信的调度信息, 所述调度信息包括 D2D通信使用的时频资源等 信息。
可选的, 如果目标基站没有指示 UE1转发 UE2的 TA信息, 则目标基站可 以在调度信息中包含 UE2的 TA信息。
31 1、 UE1和 UE2接收目标基站发送的 D2D通信的调度信息。
312、 UE1和 UE2根据所述调度信息在目标小区继续进行 D2D通信。
可选的,如果 UE2接收到的调度信息中包括目标基站为 UE2配置的 TA值, 则 UE2可以在 D2D通信之前向目标基站补充发送切换完成消息。
值得说明的是,所述小区间切换包括基站内小区间切换和基站间小区间切 换。 当 UE在基站内进行小区间切换时, 源基站与目标基站为同一基站。 此时, 目标小区即是源基站自身的小区, D2D通信的 UE相当于在源基站的不同小区 之间实现了切换。
本发明实施例提供的小区间切换的方法,由 UE对当前 D2D通信进行检测, 根据检测结果确定检测报告,将所述检测报告发送到源基站; 当所述检测报告 满足预设的切换条件时,源基站向 UE发送切换命令以指示 UE切换至目标小区。 与现有技术相比, 本发明实施例提供的方法能够使得正在进行 D2D通信的 UE 切换至目标小区后, 在目标小区继续保持当前的 D2D通信, 提升用户体验。 实施例 4
本发明实施例提供了一种小区间切换的方法,如图 4所示,所述方法包括: 步骤 401-405与实施例 3中的步骤 301- 305相同, 此处不再赞述。
406、 源基站接收到所述切换请求信令的响应消息后, 向任意一个 UE (可 以是 UE1 ,也可以是 UE2 , 本实施例以 UE1 为例)发送切换命令, 以指示 UE1 从源基站切换至目标基站。
值得说明的是, 所述切换命令中可包括转发标识和同步切换指令, 所述转 发标识用于指示所述任意一个 UE将接收到的切换命令转发给当前处于 D2D通
信状态的剩余 UE , 所述同步切换指令用于指示当前处于 D2D通信状态的两个 或多个 UE同时切换至目标基站后继续进行 D2D通信。
值得说明的是, 如果 UE1和 UE2的参数不同 (例如 C-RNTI , 随机接入参 数等), 则源基站可以在向 UE1发送的切换命令中携带差异参数, 由 UE1转发 给 UE2。
407、 UE1接收到所述到切换命令后, 根据转发标识向 UE2转发切换命令, 所述切换命令中包括目标基站为 UE2配置的 C-RNTI、 随机接入参数等信息。
408、 UE1和 UE2分别根据所述切换命令与目标基站进行同步, 向目标基 站发送随机接入前导码, 并接收目标基站返回的响应消息以获得 TA值。
如果切换命令中指示只有一个 UE执行随机接入过程, 则其他 UE的 TA值 可以由执行随机接入过程的 UE转发, 也可以由目标基站在调度信息中携带发 送, 具体过程可以参见实施例 3。
值得说明的是,如果目标基站没有给 UE1和 UE2分配专用的随机接入前导 码, UE1和 UE2也可以釆用竟争的接入方式接入目标基站。
409、 目标基站接收到所述随机接入前导码后, 向 UE1和 UE2返回随机接 入前导码的响应消息, 所述响应消息中包括目标基站为 UE1和 UE2配置的 TA 值。
410、 UE1 和 UE2 成功接入目标基站后, UE1 向目标基站发送切换完成 ( Handover Comp le te ) 消息。
411、 目标基站为 UE1和 UE2配置 D2D通信的调度信息, 所述调度信息包 括 D2D通信参数, 所述 D2D通信参数包括 D2D通信使用的时频资源等信息。
412、 UE1和 UE2接收目标基站发送的 D2D通信的调度信息。
41 3、 UE1和 UE2根据所述调度信息在目标小区继续进行 D2D通信。
值得说明的是,所述小区间切换包括基站内小区间切换和基站间小区间切 换。 当 UE在基站内进行小区间切换时, 源基站与目标基站为同一基站。
本发明实施例提供的小区间切换的方法,源基站可以将切换信令单独发送
给一个 UE, 由该 UE将切换信令转发给处于 D2D通信状态的剩余 UE以完成小 区间切换。 与现有技术相比, 本发明实施例提供的方法不仅能够使得正在进行 D2D通信的 UE切换至目标小区后, 在目标小区继续保持当前的 D2D通信, 还 能够节省基站的信令开销。 实施例 5
本发明实施例提供了一种 UE , 能够实现上述方法实施例中 UE侧的方法, 如图 5所示, 所述 UE包括上 ^艮单元 51和切换单元 52 , 其中:
上报单元 51用于向源基站上报测量报告, 所述测量报告用于供所述源基 站判决当前用户设备以及与当前用户设备进行 D2D通信的 UE2是否能够同步切 换至目标小区;
切换单元 52用于当接收到切换命令时, 从所述源基站的源小区切换至目 标小区, 在所述目标小区继续与 UE2进行 D2D通信。
进一步的, 如图 6所示, 所述 UE还包括测量单元 53和接收单元 54 , 其 中:
测量单元 53用于对当前 UE的相邻小区以及 D2D通信进行测量,根据测量 结果确定测量 告, 所述测量才艮告包括当前 UE相邻小区的测量信息以及当前 UE与 UE2之间的路损信息;
接收单元 54用于接收切换命令, 所述切换命令包括同步切换指令, 所述 同步切换指令用于指示当前 UE和 UE2同步切换至目标小区, 并在所述目标小 区继续进行 D2D通信。
可选的, 接收单元 54接收到的切换命令还包括源基站为当前 UE配置的 D2D通信参数, 所述 D2D通信参数被当前 UE用于在目标小区继续进行 D2D通 信, 所述 D2D通信参数包括 D2D通信周期和 D2D C-RNTI。
具体的, 接收单元 54具体用于从源基站接收所述切换命令, 或者 所述接收单元 54还可以用于接收 UE2转发的切换命令。
可选的, 当接收单元 54 从源基站接收所述切换命令时, 则接收单元 54 接收到的切换命令中还包括转发标识, 所述转发标识用于指示当前 UE将所述 切换命令转发给 UE 2 ;
进一步的, 如图 7所示, 所述 UE还包括第一发送单元 55 , 用于向 UE2发 送切换命令, 以指示 UE2切换至目标小区。
可选的, 接收单元 54接收的切换命令中还可以包括第一指令, 所述第一 指令用于指示当前 UE无需执行随机接入过程;
如图 8所示, 所述 UE还包括第一获取单元 56 , 用于从 UE2获取 TA值, 根据所述 TA值向所述目标小区所属的目标基站发送上行数据, 以通知所述目 标基站当前 UE已完成切换; 或者
所述第一获取单元 56还用于从目标基站的调度信息中获取 TA值,根据所 述 TA值向目标基站发送上行数据, 以通知所述目标基站当前 UE已完成切换。
本发明实施例提供的 UE , 由上报单元 51向源基站上报测量报告, 所述测 量报告用于供所述源基站判决当前 UE能否能够切换到目标小区; 当接收到切 换命令时, 由切换单元 52切换至目标小区, 在所述目标小区继续进行 D2D通 信。 与现有技术相比, 本发明实施例提供的基站能够使得正在进行 D2D通信的 UE切换至目标小区后, 在目标小区继续保持当前的 D2D通信。 实施例 6
本发明实施例提供了一种基站, 能够实现上述方法实施例中基站侧的方 法, 如图 9所示, 所述基站包括第一处理单元 91和第二发送单元 92 , 其中: 第一处理单元 91用于根据 UE1和 UE2上报的测量报告判断当前进行 D2D 通信的 UE1和 UE2是否能够同步切换至目标小区;
第二发送单元 92用于当所述 UE1和 UE2能够同步切换至目标小区时, 向 所述 UE 1和 UE2中的至少一个 UE发送切换命令, 以指示所述 UE1和 UE2同步 切换至目标小区, 并在所述目标小区继续进行 D2D通信。
进一步的,如图 1 0所示,所述基站还包括第二获取单元 93 ,用于获取 UE 1 和 UE2上报的测量报告, 所述测量报告包括 UE1相邻小区的测量信息、 UE2相 邻小区的测量信息以及 UE1和 UE2之间的路损信息。
具体的, 如果第二发送单元 92仅向 UE 1发送切换命令, 则所述切换命令 中还包括转发标识,所述转发标识用于指示接收到所述切换命令的 UE1向当前 正在进行 D2D通信的 UE2转发切换命令;
如果第二发送单元 92仅向 UE2发送切换命令, 则所述切换命令中还包括 转发标识,所述转发标识用于指示接收到所述切换命令的 UE2向当前正在进行 D2D通信的 UE2转发切换命令。
具体的, 第二发送单元 92发送的切换命令中携带有 D2D通信参数, 所述 D2D通信参数被 UE1和 /或 UE2用于在目标小区继续进行 D2D通信, 所述 D2D 通信参数包括 D2D通信周期和 D2D C-RNTI ;
则如图 1 1所示, 所述基站还包括:
第三发送单元 94 , 用于向所述目标小区所属的目标基站发送切换请求信 令, 所述切换请求信令中携带有所述 D2D通信参数, 用于指示目标基站根据所 述 D2D通信参数对 UE1和 /或 UE2进行 D2D通信调度。
本发明实施例提供的基站, 当正在进行 D2D通信的 UE需要进行小区间切 换时, 由第一处理单元 91根据 UE上报的测量报告判决所述 UE是否能够切换 至目标小区; 当所述 UE能够切换至目标小区时, 第二发送单元 92向所述 UE 发送切换命令, 以指示所述 UE同步切换至目标小区, 在所述目标小区继续进 行 D2D通信。 与现有技术相比, 本发明实施例提供的基站能够使得正在进行 D2D通信的两个或多个 UE切换至目标小区后,在目标小区继续保持当前的 D2D 通信; 该基站还可以仅对处于 D2D通信中的单独一个 UE发送切换命令以完成 小区间切换, 能够节省基站的信令开销。
本发明实施例还提供了一种小区间切换的系统, 包括图 5-8所述的 UE以 及图 9-1 1所述的基站, 能够使得进行 D2D通信的 UE切换到相邻小区时保持
D2D通信。
通过以上的实施方式的描述,所属领域的技术人员可以清楚地了解到本发 明可借助软件加必需的通用硬件的方式来实现, 当然也可以通过硬件,但很多 情况下前者是更佳的实施方式。基于这样的理解, 本发明的技术方案本质上或 者说对现有技术做出贡献的部分可以以软件产品的形式体现出来,该计算机软 件产品存储在可读取的存储介质中, 如计算机的软盘, 硬盘或光盘等, 包括若 干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备 等)执行本发明各个实施例所述的方法。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于 此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到 变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应 以所述权利要求的保护范围为准。
Claims
1、 一种小区间切换的方法, 其特征在于, 包括:
第一用户设备向源基站上报测量报告,所述测量报告用于供所述源基站判 决当前进行设备间直接通信 D2D通信的所述第一用户设备与第二用户设备是 否能够同步切换至目标小区;
当接收到切换命令时,所述第一用户设备从属于源基站的源小区切换至目 标小区, 在所述目标小区继续与第二用户设备进行 D2D通信。
2、 根据权利要求 1所述的方法, 其特征在于, 所述第一用户设备向源基 站上报测量报告之前, 还包括:
对第一用户设备的相邻小区以及 D2D通信进行测量,根据测量结果确定测 量报告, 所述测量报告包括第一用户设备相邻小区的测量信息以及当前进行 D2D通信的第一用户设备和第二用户设备之间的路损信息。
3、 根据权利要求 1或 2所述的方法, 其特征在于, 所述切换命令包括同 步切换指令,所述同步切换指令用于指示当前进行 D2D通信的第一用户设备和 第二用户设备同步切换至目标小区并在所述目标小区继续进行 D2D通信。
4、 根据权利要求 1 - 3中任一项所述的方法, 其特征在于, 所述切换命令 还包括所述源基站为第一用户设备配置的 D2D通信参数,所述 D2D通信参数被 第一用户设备用于在目标小区继续进行 D2D通信, 所述 D2D通信参数包括 D2D 通信周期和 D2D小区无线网络临时标识 D2D C-RNTI。
5、 根据权利要求 1 - 4中任一项所述的方法, 其特征在于, 所述切换命令 由源基站发送或来自第二用户设备的转发。
6、 根据权利要求 5所述的方法, 其特征在于, 如果所述切换命令由源基 站发送, 则所述切换命令中还包括转发标识, 所述转发标识用于指示第一用户 设备将所述切换命令转发给第二用户设备;
所述方法还包括:
向所述第二用户设备发送所述切换命令,以指示所述第二用户设备切换至 目标小区。
7、 根据权利要求 5或 6所述的方法, 其特征在于, 所述切换命令中还包 括第一指令, 所述第一指令用于指示第一用户设备无需执行随机接入过程; 所述方法还包括:
从第二用户设备获取定时提前量 TA值,根据所述 TA值向所述目标小区所 属的目标基站发送上行数据, 以通知所述目标基站第一用户设备已完成切换; 或者,
从所述目标小区所属的目标基站的调度信息中获取 TA值, 根据所述 TA 值向目标基站发送上行数据, 以通知所述目标基站第一用户设备已完成切换。
8、 一种小区间切换的方法, 其特征在于, 包括:
根据第一用户设备和第二用户设备上报的测量报告判断当前进行设备间 直接通信 D2D 通信的第一用户设备与第二用户设备是否能够同步切换至目标 小区;
当所述第一用户设备与第二用户设备能够同步切换至目标小区时,向所述 第一用户设备与第二用户设备中的至少一个发送切换命令,以指示所述第一用 户设备与第二用户设备同步切换至目标小区, 并在所述目标小区继续进行 D2D 通信。
9、 根据权利要求 8所述的方法, 其特征在于, 所述测量报告包括所述第 一用户设备相邻小区的测量信息、第二用户设备相邻小区的测量信息以及当前 进行 D2D通信的第一用户设备和第二用户设备之间的路损信息。
10、 根据权利要求 8或 9所述的方法, 其特征在于, 所述向所述第一用户 设备与第二用户设备中的至少一个发送切换命令包括:
向第一用户设备发送切换命令;
所述切换命令中还包括转发标识,所述转发标识用于指示接收到所述切换 命令的第一用户设备向所述第二用户设备转发切换命令;
或者 所述向所述第一用户设备与第二用户设备中的至少一个发送切换命令包 括:
向第二用户设备发送切换命令;
所述切换命令中还包括转发标识,所述转发标识用于指示接收到所述切换 命令的第二用户设备向当前进行 D2D通信的第一设备转发切换命令。
11、 根据权利要求 8-10中任一项所述的方法, 其特征在于, 所述切换命 令中携带有 D2D通信参数, 所述 D2D通信参数被第一用户设备和 /或第二用户 设备用于在目标小区继续进行 D2D通信,所述 D2D通信参数包括 D2D通信周期 和 D2D小区无线网络临时标识 D2D C-RNTI ;
所述方法还包括:
向所述目标小区所属的目标基站发送切换请求信令,所述切换请求信令中 携带有所述 D2D通信参数,用于指示目标基站根据所述 D2D通信参数对所述第 一用户设备和 /或第二用户设备进行 D2D通信调度。
12、 一种用户设备, 其特征在于, 包括:
上报单元, 用于向源基站上报测量报告, 所述测量报告用于供所述源基站 判决当前用户设备以及与当前用户设备进行设备间直接通信 D2D通信的第二 用户设备是否能够同步切换至目标小区;
切换单元, 用于当接收到切换命令时,从所述源基站的源小区切换至目标 小区, 在所述目标小区继续与所述第二用户设备进行 D2D通信。
13、 根据权利要求 12所述的用户设备, 其特征在于, 还包括:
测量单元, 用于对当前用户设备的相邻小区以及 D2D通信进行测量,根据 测量结果确定测量报告,所述测量报告包括当前用户设备相邻小区的测量信息 以及当前用户设备与所述第二用户设备之间的路损信息。
14、 根据权利要求 12或 13所述的用户设备, 其特征在于, 所述用户设备 还包括:
接收单元, 用于接收切换命令, 所述切换命令包括同步切换指令, 所述同 步切换指令用于指示当前用户设备和所述第二用户设备同步切换至目标小区, 并在所述目标小区继续进行 D2D通信。
15、 根据权利要求 12-14中任一项所述的用户设备, 其特征在于, 所述接 收单元接收到的切换命令还包括所述源基站为当前用户设备配置的 D2D 通信 参数, 所述 D2D通信参数被当前用户设备用于在目标小区继续进行 D2D通信, 所述 D2D 通信参数包括 D2D 通信周期和 D2D 小区无线网络临时标识 D2D C- RNTI。
16、 根据权利要求 12-15中任一项所述的用户设备, 其特征在于, 所述接 收单元具体用于从源基站接收所述切换命令, 或者
所述接收单元还用于接收所述第二用户设备转发的切换命令。
17、 根据权利要求 16所述的用户设备, 其特征在于, 当所述接收单元从 源基站接收所述切换命令时 ,则所述接收单元接收到的切换命令中还包括转发 标识,所述转发标识用于指示当前用户设备将所述切换命令转发给所述第二用 户设备;
所述用户设备还包括:
第一发送单元, 用于向所述第二用户设备发送所述切换命令, 以指示所述 第二用户设备切换至目标小区。
18、 根据权利要求 16或 17所述的用户设备, 其特征在于, 所述接收单元 接收的切换命令中还包括第一指令,所述第一指令用于指示当前用户设备无需 执行随机接入过程;
所述用户设备还包括:
第一获取单元, 用于从所述第二用户设备获取定时提前量 TA值, 根据所 述 TA值向所述目标小区所属的目标基站发送上行数据, 以通知所述目标基站 当前用户设备已完成切换; 或者
所述第一获取单元还用于从目标基站的调度信息中获取 TA值, 根据所述 TA值向目标基站发送上行数据, 以通知所述目标基站当前用户设备已完成切 换。
19、 一种基站, 其特征在于, 包括:
第一处理单元,用于根据第一用户设备和第二用户设备上报的测量报告判 断当前进行设备间直接通信 D2D通信的第一用户设备与第二用户设备是否能 够同步切换至目标小区;
第二发送单元,用于当所述第一用户设备与第二用户设备能够同步切换至 目标小区时, 向所述第一用户设备与第二用户设备中的至少一个发送切换命 令, 以指示所述第一用户设备与所述第二用户设备同步切换至目标小区, 并在 所述目标小区继续进行 D2D通信。
20、 根据权利要求 19所述的基站, 其特征在于, 所述基站还包括: 第二获取单元, 用于获取第一用户设备和第二用户设备上报的测量报告, 所述测量报告包括所述第一用户设备相邻小区的测量信息、第二用户设备相邻 小区的测量信息以及当前进行 D2D 通信的第一用户设备和第二用户设备之间 的路损信息。
21、 根据权利要求 19或 20所述的基站, 其特征在于, 如果所述第二发送 单元仅向所述第一用户设备发送切换命令, 则所述切换命令中还包括转发标 识,所述转发标识用于指示接收到所述切换命令的第一用户设备向所述第二用 户设备转发切换命令;
如果所述第二发送单元仅向所述第二用户设备发送切换命令,则所述切换 命令中还包括转发标识,所述转发标识用于指示接收到所述切换命令的第二用 户设备向当前进行 D2D通信的第一用户设备转发切换命令。
22、 根据权利要求 19-21中任一项所述的基站, 其特征在于, 所述第二发 送单元发送的切换命令中携带有 D2D通信参数,所述 D2D通信参数被第一用户 设备和 /或第二用户设备用于在目标小区继续进行 D2D通信, 所述 D2D通信参 数包括 D2D通信周期和 D2D小区无线网络临时标识 D2D C-RNTI ;
所述基站还包括: 第三发送子单元, 用于向所述目标小区所属的目标基站发送切换请求信 令, 所述切换请求信令中携带有所述 D2D通信参数, 用于指示目标基站根据所 述 D2D通信参数对第一用户设备和 /或第二用户设备进行 D2D通信调度。
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