WO2013102390A1 - Intercell handover method and device - Google Patents

Intercell handover method and device Download PDF

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Publication number
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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WO
WIPO (PCT)
Prior art keywords
user equipment
base station
d2d communication
target cell
handover command
Prior art date
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PCT/CN2012/086042
Other languages
French (fr)
Chinese (zh)
Inventor
李亚娟
常俊仁
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to CN201210002055.7A priority Critical patent/CN103200634B/en
Priority to CN201210002055.7 priority
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2013102390A1 publication Critical patent/WO2013102390A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements

Abstract

Provided are an intercell handover method, device and system, which relate to the field of communications and are used for solving the problem of communication interruption after handing over UE which carries out D2D communication to an adjacent cell. The method provided in the present invention comprises: first user equipment reporting a measurement report to a source base station, the measurement report being used for the source base station to judge whether the first user equipment and second user equipment which carry out device-to-device direct communication (D2D communication) currently can be handed over to a target cell synchronously; and when receiving a handover command, handing over a source cell of the first user equipment which is subordinate to the source base station to the target cell, the first user equipment continuing D2D communication with the second user equipment in the target cell. The present invention is applied to the field of communications, and is used for achieving the intercell handover of D2D communication.

Description

 Small interval switching method and device

 The present application claims priority to Chinese Patent Application No. 201210002055.7, entitled "Method and Apparatus for Inter-Cell Switching", filed on January 5, 2012, the entire contents of which is incorporated herein by reference. .

Technical field

 The present invention relates to the field of communications, and in particular, to a method and apparatus for inter-cell handover. Background technique

 In a traditional cellular mobile communication network, communication between UEs (User Equipments) needs to be centrally controlled by the base station, and 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.

 In a conventional cellular network, user data needs to pass through the base station and the core network even when communicating between two closely spaced UEs. However, with the rapid development of cellular networks, network capacity in many regions is close to saturation. In order to reduce the load of the macro network, D2D (Dev i ce to Dev i ce, direct communication between devices) technology can be used. In 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.

 Since the current D2D technology is still immature, only communication between two or more UEs in the same cell is supported; when two or more UEs are simultaneously switched to another cell, D2D communication between UEs is interrupted. .

Summary of the invention

 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.

 In order to achieve the above object, embodiments of the present invention use the following technical solutions:

In one aspect, 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. ;

 When receiving the handover command, 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.

 On the other hand, 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;

 When 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.

 In another aspect, 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

 And 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.

 In another aspect, 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 method and device for inter-cell handover provided by the embodiment of the present invention, 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. To instruct the UE to handover to the target cell. Compared with the prior art, 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. DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

 1 is a schematic flowchart of a method according to Embodiment 1 of the present invention;

 2 is a schematic flowchart of a method according to Embodiment 2 of the present invention;

 3 is a schematic flowchart of a method according to Embodiment 3 of the present invention;

 4 is a schematic flowchart of a method according to Embodiment 4 of the present invention;

 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

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. 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.

 Specifically, 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 measurement information of the neighboring cell of UE2, and the path loss information between UE1 and UE2, and the like.

 It is to be noted that 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.

 1 02. 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.

 That is to say, after receiving the synchronization handover command, the UE may switch to the target cell synchronously with another UE that performs D2D communication with the UE.

 According to the method provided by the embodiment of the present invention, 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. Compared with the prior art, 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. Example 2

 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.

 Specifically, 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.

Specifically, 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:

 To determine whether 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.

 It should be noted that 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. If 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.

 202. When the UE1 and the UE2 that are in the D2D communication are able to perform the handover to the target cell, 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.

 It is to be noted that 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.

According to the method provided by the embodiment of the present invention, 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. Compared with the prior art, 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. Example 3

 The embodiment of the invention provides a method for inter-cell handover. As shown in FIG. 3, the method includes:

301. Perform D2D communication between two or more UEs that are relatively close.

 Specifically, the D2D communication may be a voice call, share data, or send a file, etc., but is not limited thereto.

 For ease of understanding, 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.

 302. 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.

 Specifically, 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.

 Optionally, the measurement report may further include location information where the UE 1 and the UE 2 are located.

 303. 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. .

 Specifically, 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.

 It should be noted that if the location information is not carried in the measurement report of the UE, the base station may also use the UE location information measured by the base station side.

304. The source base station sends handover request signaling to the target base station, where the handover request signaling includes UE1. And the D2D context information of the UE2, where the D2D context information 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.

 It should be noted that, 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.

 305. 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.

 Specifically, 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).

 It is to be noted that 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.

 It is to be noted that, if the handover request signaling received by the target base station includes the context information of the two UEs of the UE1 and the UE2, 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.

 306. 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.

 Optionally, the handover command may further include a D2D communication parameter required for D2D communication. Specifically, the D2D communication parameters include: a D2D communication cycle and a D2D C-RNTI, but are not limited thereto.

It is worth noting that when the D2D communication parameters are not included in the handover command, 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.

 307. 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.

 308. 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.

 Optionally, 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.

 Specifically, 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; After receiving the handover command, UE2 determines that the random access procedure does not need to be performed, and only needs to listen to the downlink scheduling information. After 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.

 309. After UE1 and UE2 successfully access the target base station, send a Handover Complet message to the target base station.

 Optionally, 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.

310. 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.

 Optionally, if the target base station does not indicate that the UE1 forwards the TA information of the UE2, the target base station may include the TA information of the UE2 in the scheduling information.

 31 1. UE1 and UE2 receive scheduling information of D2D communication sent by the target base station.

 312. UE1 and UE2 continue to perform D2D communication in the target cell according to the scheduling information.

 Optionally, if the scheduling information received by the UE2 includes the TA value configured by the target base station for the UE2, the UE2 may supplement the sending of the handover complete message to the target base station before the D2D communication.

 It is worth noting that the inter-cell handover includes inter-cell handover in the base station and inter-cell handover between the base stations. When the UE performs inter-cell handover in the base station, the source base station and the target base station are the same base station. At this time, 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 method for inter-cell handover provided by the embodiment of the present invention, 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. Compared with the prior art, 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. Example 4

 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.

 406. 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.

It is to be noted that 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.

 It is to be noted that if the parameters of the UE1 and the UE2 are different (for example, C-RNTI, random access parameters, etc.), 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.

 407. 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.

 408. 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.

 If the handover command indicates that only one UE performs the random access procedure, 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. For the specific process, refer to Embodiment 3 .

 It should be noted that if the target base station does not allocate a dedicated random access preamble to UE1 and UE2, UE1 and UE2 can also access the target base station by using a competitive access mode.

 409. 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.

 After the UE1 and the UE2 successfully access the target base station, the UE1 sends a Handover Complete message to the target base station.

 411. 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.

 412. UE1 and UE2 receive scheduling information of D2D communication sent by the target base station.

 41 3. UE1 and UE2 continue D2D communication in the target cell according to the scheduling information.

 It is worth noting that the inter-cell handover includes inter-cell handover in the base station and inter-cell handover between the base stations. When the UE performs inter-cell handover in the base station, the source base station and the target base station are the same base station.

The method for inter-cell handover provided by the embodiment of the present invention, 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. Compared with the prior art, 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. Example 5

 The embodiment of the present invention provides a UE, which can implement the method of the UE side in the foregoing method embodiment. As shown in FIG. 5, 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.

 Further, as shown in FIG. 6, 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. Information

 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.

 Optionally, 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.

Specifically, 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. Optionally, when the receiving unit 54 receives the handover command from the source base station, 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 ;

 Further, as shown in FIG. 7, 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.

 Optionally, 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;

 As shown in FIG. 8, 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. Compared with the prior art, 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. Example 6

 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. As shown in FIG. 9, 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. Further, as shown in FIG. 10, 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.

 Specifically, if the second sending unit 92 only sends a handover command to the UE 1, 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;

 If the second sending unit 92 only sends a handover command to the UE2, 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. .

 Specifically, 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;

 As shown in FIG. 1 , 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. Compared with the prior art, 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.

 Through the description of the above embodiments, those skilled in the art can clearly understand that 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. . Based on such understanding, 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.

 The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Rights request
 A method for switching between cells, characterized in that it comprises:
 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. ;
 When receiving the handover command, 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 method according to claim 1, wherein before the first user equipment reports the measurement report to the source base station, the method further includes:
 Measure the neighboring cell of the first user equipment and the D2D communication, and determine a measurement report according to the measurement result, where the measurement report includes measurement information of the neighboring cell of the first user equipment, and the first user equipment and the second currently performing D2D communication Path loss information between user devices.
 The method according to claim 1 or 2, wherein the switching command includes a synchronous switching instruction, and the synchronous switching instruction is used to indicate that the first user equipment and the second user equipment that are currently performing D2D communication are synchronously switched. Go to the target cell and continue D2D communication in the target cell.
 The method according to any one of claims 1 to 3, wherein the handover command further includes a D2D communication parameter configured by the source base station for the first user equipment, and the D2D communication parameter is first The user equipment is configured to continue D2D communication in the target cell, where the D2D communication parameter includes a D2D communication period and a D2D cell radio network temporary identifier D2D C-RNTI.
 The method according to any one of claims 1 to 4, wherein the handover command is sent by a source base station or forwarded by a second user equipment.
 The method according to claim 5, wherein, if the handover command is sent by the source base station, the handover command further includes a forwarding identifier, where the forwarding identifier is used to indicate that the first user equipment The switching command is forwarded to the second user equipment;
 The method further includes:
Sending the handover command to the second user equipment to instruct the second user equipment to switch to Target cell.
 The method according to claim 5 or 6, wherein the handover command further includes a first instruction, where the first instruction is used to indicate that the first user equipment does not need to perform a random access procedure; Also includes:
 Obtaining a timing advance TA value from the second user equipment, and transmitting uplink data to the target base station to which the target cell belongs according to the TA value, to notify the target base station that the first user equipment has completed the handover; or
 Obtaining a TA value from the scheduling information of the target base station to which the target cell belongs, and transmitting uplink data to the target base station according to the TA value, to notify the target base station that the first user equipment has completed the handover.
 8. A method for inter-cell handover, characterized in that it comprises:
 Determining, according to the measurement report reported by the first user equipment and the second user equipment, whether the first user equipment and the second user equipment that are currently performing direct communication between the devices and the second user equipment can be synchronously switched to the target cell;
 When 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 method according to claim 8, wherein the measurement report includes measurement information of a neighboring cell of the first user equipment, measurement information of a neighboring cell of the second user equipment, and a current D2D communication. Path loss information between a user equipment and a second user equipment.
 The method according to claim 8 or 9, wherein the sending the handover command to the at least one of the first user equipment and the second user equipment comprises:
 Sending a handover command to the first user equipment;
 The switching command further includes a forwarding identifier, where the forwarding identifier is used to indicate that the first user equipment that receives the handover command forwards the handover command to the second user equipment;
Or The sending the handover command to the at least one of the first user equipment and the second user equipment includes:
 Sending a handover command to the second user equipment;
 The switching command further includes a forwarding identifier, where the forwarding identifier is used to indicate that the second user equipment that receives the handover command forwards the handover command to the first device that is currently performing D2D communication.
 The method according to any one of claims 8 to 10, wherein the handover command carries a D2D communication parameter, and the D2D communication parameter is used by the first user equipment and/or the second user equipment. And performing D2D communication in the target cell, where the D2D communication parameter includes a D2D communication period and a D2D cell radio network temporary identifier D2D C-RNTI;
 The method further includes:
 Transmitting a handover request signaling to the target base station to which the target cell belongs, where the handover request signaling carries the D2D communication parameter, and is used to indicate that the target base station is to the first user equipment according to the D2D communication parameter. Or the second user equipment performs D2D communication scheduling.
 12. A user equipment, comprising:
 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
 And 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.
 The user equipment according to claim 12, further comprising:
 a measuring unit, configured to perform measurement on a neighboring cell of the current user equipment and D2D communication, and determine a measurement report according to the measurement result, where the measurement report includes measurement information of a current cell neighboring cell, and the current user equipment and the second user Path loss information between devices.
 The user equipment according to claim 12 or 13, wherein the user equipment further comprises:
a receiving unit, configured to receive a switching command, where the switching command includes a synchronous switching instruction, and the same The step switching instruction is used to indicate that the current user equipment and the second user equipment are synchronously handed over to the target cell, and continue to perform D2D communication in the target cell.
 The user equipment according to any one of claims 12 to 14, wherein the handover command received by the receiving unit further includes D2D communication parameters configured by the source base station for the current user equipment, the D2D The communication parameters are used by the current user equipment to continue D2D communication in the target cell, the D2D communication parameters including a D2D communication period and a D2D cell radio network temporary identifier D2D C-RNTI.
 The user equipment according to any one of claims 12-15, wherein the receiving unit is specifically configured to receive the handover command from a source base station, or
 The receiving unit is further configured to receive a handover command forwarded by the second user equipment.
 The user equipment according to claim 16, wherein when the receiving unit receives the handover command from a source base station, the handover command received by the receiving unit further includes a forwarding identifier, and the forwarding The identifier is used to indicate that the current user equipment forwards the handover command to the second user equipment;
 The user equipment further includes:
 And a first sending unit, configured to send the handover command to the second user equipment, to indicate that the second user equipment is handed over to the target cell.
 The user equipment according to claim 16 or 17, wherein the handover command received by the receiving unit further includes a first instruction, where the first instruction is used to indicate that the current user equipment does not need to perform a random access procedure. ;
 The user equipment further includes:
 a first acquiring unit, configured to acquire a timing advance TA value from the second user equipment, 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 that the current user equipment is completed. Switch; or
The first acquiring unit 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 user equipment has completed cutting. Change.
 19. A base station, comprising:
 a first processing unit, configured to determine, according to the measurement report reported by the first user equipment and the second user equipment, whether the first user equipment and the second user equipment that are currently performing direct communication between the devices and the second user equipment 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 handed over to the target cell, and D2D communication is continued in the target cell.
 The base station according to claim 19, wherein the base station further comprises: a second acquiring unit, configured to acquire a measurement report reported by the first user equipment and the second user equipment, where the measurement report includes the The measurement information of the neighboring cell of the first user equipment, the measurement information of the neighboring cell of the second user equipment, and the path loss information between the first user equipment and the second user equipment that are currently performing D2D communication.
 The base station according to claim 19 or 20, wherein, if the second sending unit sends a handover command only to the first user equipment, the handover command further includes a forwarding identifier, and the forwarding Identifying, by the first user equipment that receives the handover command, forwarding a handover command to the second user equipment;
 And if the second sending unit sends the switching command to the second user equipment, the switching command further includes a forwarding identifier, where the forwarding identifier is used to indicate that the second user equipment that receives the switching command is current The first user equipment performing D2D communication forwards the handover command.
 The base station according to any one of claims 19 to 21, wherein the handover command sent by the second sending unit carries a D2D communication parameter, and the D2D communication parameter is used by the first user equipment and/or Or the second user equipment is configured to continue D2D communication in the target cell, where the D2D communication parameter includes a D2D communication period and a D2D cell radio network temporary identifier D2D C-RNTI;
The base station further includes: a third sending subunit, configured to send a handover request signaling to the target base station to which the target cell belongs, 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 The first user equipment and/or the second user equipment perform D2D communication scheduling.
PCT/CN2012/086042 2012-01-05 2012-12-06 Intercell handover method and device WO2013102390A1 (en)

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