WO2013097586A1

WO2013097586A1 - Communication handover method, user equipment and base station

Info

Publication number: WO2013097586A1
Application number: PCT/CN2012/085906
Authority: WO
Inventors: 李亚娟; 常俊仁
Original assignee: 华为技术有限公司
Priority date: 2011-12-29
Filing date: 2012-12-05
Publication date: 2013-07-04
Also published as: CN103188742A; CN103188742B

Abstract

A communication handover method, user equipment and a base station_. The method includes: UE receiving a time frequency resource sent by a base station which is used by the UE to perform D2D communication with another UE, the time frequency resource being able to indicate the D2D operating period of the D2D communication; the UE performing D2D communication with another UE according to the time frequency resource in the D2D operating period; when the D2D operating period is ended, the UE pausing the D2D communication with the other UE; the UE entering an operating period during which the UE communicates with the base station and communicating with the base station, wherein the operating period during which the UE communicates with the base station is synchronous with the operating period during which another UE communicates with the base station. In the technical solution in the embodiments of the present invention, provided is a handover solution between D2D communication and conventional communication, which can ensure that the conventional communication between two UEs and the base station can be performed normally during D2D communication.

Description

Communication switching method, user equipment and base station

The present application claims priority to Chinese Patent Application No. 201110452236.5, entitled "Communication Switching Method, User Equipment and Base Station", filed on December 29, 2011, the entire contents of which is incorporated herein by reference. in.

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a communication switching method, a user equipment, and a base station. In a traditional cellular network, when a user equipment (UE) needs to communicate with other UEs, it needs to pass through a base station (such as an evolved base station (eNB)), even if the two UEs are very close to each other. In this case, it also passes through the eNB. The advantage of the eNB control is that the eNB can centrally control the utilization of the radio resources of the cell, which is beneficial to interference control; however, this traditional communication mode causes a large network load.

For example, when the same amount of data is transmitted, when two UEs with similar distances can directly communicate, compared with the cellular mode, the radio resources can be utilized more effectively, the signaling load can be reduced, and the UE transmit power can be reduced. Therefore, with the rapid development of cellular networks, network capacity in many regions is now near saturation. In order to reduce the load on macro networks, a communication technology such as Device to Device (D2D) is being researched, and D2D communication is being studied. A typical feature is the close distance between a device (such as a UE) and a device (such as a UE). For example, with the continuous development of smart phones, more and more UEs need close data transmission, such as sharing data, transferring pictures, business cards, etc., which are typical D2D communication.

With the in-depth study of D2D communication, it is urgent to provide a switching method of D2D communication and traditional communication to realize switching between D2D communication and traditional communication.

SUMMARY OF THE INVENTION Embodiments of the present invention provide a communication switching method, a user equipment, and a base station, to provide a D2D communication and a traditional communication switching method, and implement switching between D2D communication and traditional communication. The embodiment of the invention provides a communication switching method, including:

The user equipment receives a time-frequency resource that is sent by the base station and performs D2D communication with another user equipment by the base station; the time-frequency resource can indicate a D2D working period of the D2D communication;

The user equipment performs the D2D communication with the another user equipment according to the time-frequency resource during the D2D working period;

When the D2D work cycle ends, the user equipment suspends the D2D communication with the another user equipment;

The user equipment enters a working period in which the user equipment communicates with the base station, and communicates with the base station; a working period in which the user equipment communicates with the base station, and another user equipment and the base station The work cycle for communication is synchronized.

The embodiment of the invention further provides a communication switching method, including:

The base station configures a time-frequency resource of the D2D communication for the user equipment and another user equipment, and sends the time-frequency resource to the user equipment and the another user equipment; the time-frequency resource can indicate the D2D of the D2D communication. Working period;

When the D2D working period ends, the base station enters a working period in which the base station communicates with the user equipment, and a working period in which the base station communicates with the another user equipment, and the user equipment and/or Or the another user equipment performs communication; a working period in which the base station communicates with the user equipment is synchronized with a working period in which the base station communicates with the another user equipment.

The embodiment of the invention further provides a user equipment, including:

a receiving module, configured to receive a time-frequency resource that is sent by the base station to perform D2D communication with another user equipment, where the time-frequency resource can indicate a D2D working period of the D2D communication;

a first communication module, configured to perform the D2D communication with the another user equipment according to the time-frequency resource received by the receiving module;

a processing module, configured to suspend the D2D communication performed by the another user equipment in the D2D work cycle when the D2D work cycle of the first communication module performs D2D communication ends; the second communication module, When the processing module suspends the D2D communication with the another user equipment, enters a working period in which the user equipment communicates with the base station, communicates with the base station, and communicates with the base station; The duty cycle is synchronized with the duty cycle in which the other user equipment communicates with the base station.

The embodiment of the invention further provides a base station, including: a configuration module, configured to configure a time-frequency resource for D2D communication for the user equipment and another user equipment; the time-frequency resource can indicate a working period of the D2D communication;

a communication module, configured to send the time-frequency resource to the user equipment and the another user equipment;

The communication module is further configured to: when the D2D working period ends, a working period in which the base station enters communication between the base station and the user equipment, and a working period in which the base station communicates with the another user equipment, Communicating with the user equipment and/or the another user equipment; a working period in which the base station communicates with the user equipment is synchronized with a working period in which the base station communicates with the other user equipment.

The communication switching method, the user equipment, and the base station in the embodiment of the present invention can perform the D2D communication between two user equipments and the traditional communication between the two user equipments and the base station by using the above technical solutions, thereby making up for the existing The technical deficiencies provide an effective D2D communication and traditional communication switching scheme, which can ensure the traditional communication between the two user equipments and the base station can be performed normally during the D2D communication, thereby effectively ensuring D2D communication and Switching efficiency of traditional communication.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor.

FIG. 1 is a flowchart of a method for establishing a D2D connection according to an embodiment of the present invention.

FIG. 2 is a flowchart of a communication switching method according to an embodiment of the present invention.

FIG. 3 is a flowchart of a communication switching method according to another embodiment of the present invention.

FIG. 4 is a signaling diagram of a communication switching method according to an embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a UE according to an embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a base station according to another embodiment of the present invention. FIG. 8 is a schematic structural diagram of a communication switching system according to an embodiment of the present invention. 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. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

Device to Device (D2D) communication technology enables service and data applications for local ad-hoc networks and short-range communications. To improve spectrum utilization, the D2D system shares the same resources as the cellular system. The D2D terminal in the D2D system accesses the cellular system, and the time and time slot of the cellular system are to be followed. D2D systems can support services such as information sharing, games, social services, and mobile advertising.

FIG. 1 is a flowchart of a method for establishing a D2D connection according to an embodiment of the present invention. As shown in FIG. 1, the connection establishment method may include the following steps:

101. The UE1 (User Equipment 1; UE1) supporting the D2D function obtains a resource for broadcasting the information of the UE1, where the information of the UE1 includes one or a combination of the identifier of the UE1, the service information, the service code, and the application layer service information.

The identifier may be one or a combination of a physical identifier, a Non-Access Stratum Identifier (NAS ID), and an Access Stratum Identifier (AS ID); for example, the physical identifier may be It is: a specific code sequence such as International Mobile Subscriber Identification (IMSI); the NAS ID can be a Serving Temporary Mobile Subscriber Identifier (s-TMSI) or a Global Unique Temporary Identifier. ; GUTI ) , if UE1 is in the idle state, you can use the old saved s-TMSI or the old GUTI (old GUTI); if UE 1 is in the connected state, you can use the current s-TMSI or the current GUTI; AS The ID may be a Cell Radio Network Temporary Identifier (C-RNTI) or a D-RNTI (ie, a Radio Network Temporary Identifier (RNTI) for D2D); the application layer service information includes the user. Service information that can be interpreted, the service information that the user can interpret includes the service class And / or services, for example, services may be advertising information, a movie or game of a movie;

The foregoing service code may be a character, a string, or a digital sequence, and may represent application layer service information; or the service code may indicate an identifier of the UE1, and one of the application layer service information and the foregoing service information;

The service information may be information of a Non-Access Stratum (NAS) required by the UE to establish a connection establishment request message of the service, including Quality of Service (QoS) information.

Specifically, when the UE supporting the D2D function is powered on or reselected to a new cell, the UE1 needs to obtain resources for broadcasting the information of the UE1.

In an implementation manner of the embodiment, the UE that supports the D2D function to obtain the information for broadcasting the information of the UE1 may be: UE1 obtains, by the serving base station of the cell where the UE1 is currently located, the UE that supports the D2D function in the cell. And a resource for broadcasting the above information of the self, the resource is broadcast by the serving base station by using a broadcast message; and then, the UE1 selects a resource whose interference level is lower than a predetermined threshold by automatically searching or measuring resources pre-allocated in the service base station. Optionally, the allocation manner of the serving base station is semi-static.

In another implementation manner of the embodiment, the resource for the UE that supports the D2D function to obtain the information for broadcasting the UE1 may be: the interference level of the sub-resource broadcasted by the serving base station of the cell where the UE1 is currently located, and the foregoing sub-resource. The location information is selected from the sub-resources broadcast by the serving base station to select a sub-resource whose interference level is lower than a predetermined threshold. The sub-resource is allocated by the serving base station to the UE supporting the D2D function in the foregoing cell, and is used for broadcasting. The resources of the above information are obtained after being divided.

In a further implementation manner of this embodiment, the UE that supports the D2D function to obtain the information for broadcasting the information of the first UE may be: UE1 establishes a connection with the serving base station of the cell where the UE1 is currently located, regardless of the real service of the UE1. Whether it exists or not, triggering the serving base station to allocate resources for broadcasting the information of the UE1 to the UE1. After the UE1 establishes a connection with the serving base station of the UE1, the UE1 can maintain a long discontinuous reception mode (long DRX mode) in a normal connection state or a connection state. When the UE1 exits the current cell, the UE1 notifies the serving base station to reclaim the resource allocated for the UE1 for broadcasting the information of the UE1.

Specifically, in this implementation manner, the connection between the UE1 and the serving base station of the cell in which the UE1 is currently located may be: UE1 sends an attach request (Attach Request) message to the serving base station, the Attach The request message carries the IMSI or the old GUTI of the UE1, and the last visited Tracking Area Identifier (last visited TAI) of the UE1, and the Core Network Capability of the UE1. UE1's Specific DRX parameters, Packet Data Network Type (PDN Type), Protocol Configuration Options, Ciphered Options Transfer Flag, Attach Type (Attach) Type ), KSIASME (for identifying the root key KASME), Non-Access Stratum sequence number (NAS sequence number), Non-Access Stratum Media Access Control (Non-Access Stratum Media Access Control) ; NAS-MAC), additional GUTI (Additional GUTI), Packet Temporary Mobile Subscriber Identifier signature (P-TMSI signature) message and Radio Resource Control (RRC) parameters, and add " D2D connection" type parameter;

Then, the serving base station encapsulates the Attach Request message sent by the UE1, generates an Initial UE Message, and sends it to the Mobility Management Entity (MME). Next, the MME sends an Attach Accept message to the UE1. The Attach Accept message is encapsulated in an SI-MME control message, for example, an Initial Context Setup Request message, and the initial context setup request message is sent to the serving base station, and finally the serving base station uses the initial context. The establishment request message is sent to the UE1, and the UE1 parses the initial context establishment request message to obtain the above-mentioned Attach Accept message.

The Attach Accept message carries an Access Point Name (APN),

GUTI, PDN Type, Packet Data Network Address (PDN Address), TAI List (TAI List), Evolved Packet System Bearer Identity (EPS Bearer Identity), and Edge Management Request (Session Management) Request information, KSIASME, NAS sequence number, and NAS-MAC; can also carry the information about the bearer for D2D connection in the profile of UE1, and attach the D2D bearer type after EPS Bearer Identity Information, or binding a specific PDN and D2D connection. Further, the Attach Accept message may further include an access layer security context (Access Stratum security context; AS security context) information, bad limit switch Table ¹ J (the Handover Restriction List), an evolved packet system carrier months good quality of service (Evolved Packet System Bearer Quality of Service; EPS Bearer QoS), UE1's maximum aggregation bit rate (Aggregate Maximum Bit) Rate; AMBR), EPS Bearer Identity (optionally, the EPS bearer includes a bearer for D2D connection), a Tunnel Endpoint Identifier (TEID) for the serving gateway of the user plane, and an address of the serving gateway.

Further, after receiving the Attach Accept message, UE1 will set "GUTI" to the Temp Identity used in Next update (TIN).

Optionally, the newly added "D2D connection" type parameter may also be placed in an SI Application Protocol (Sla-AP) message, such as an Initial Context Setup Request message, for transmitting a NAS layer Attach Accept message, and The "Support D2D Function" indication information may be added to the UE wireless capability cell of the Initial Context Setup Request message.

102. The UE1 broadcasts the information of the UE1 on the obtained resource.

Specifically, the UE supporting the D2D function has Discontinuous Receive (DRX) and Discontinuous Transmission (DTX) characteristics.

Therefore, in this embodiment, the manner in which the UE1 broadcasts the information of the UE1 may use the DTX mode to broadcast the information of the UE1 on the obtained resources by using a discontinuous transmission period (DTX-Cycle).

103. The UE2 that supports the D2D function sends the RRC connection setup request message to the serving base station by using the sensing technology or the search and measurement of other UEs supporting the D2D function to learn that the UE1 that is likely to be paired exists.

In this embodiment, before step 103, UE2 also obtains resources for broadcasting information of the UE2, and broadcasts the information of the UE2 on the obtained resources, in the same manner as described in steps 101 and 102. No longer. In this embodiment, the serving base station of the cell in which the UE2 is currently located is the same as the serving base station of the current cell of the UE1.

In this embodiment, optionally, the value of the establishment cause cell of the foregoing RRC connection setup request message is a D2D connection; further, the foregoing RRC connection setup request message may further carry the NAS ID of the UE1 (for example: old GUTI or s- And the AS ID; or, optionally, the foregoing RRC connection setup request message may further carry the service code of the UE1. In this way, the serving base station can learn that the UE2 initiates a D2D connection establishment process, and can obtain the identity of the destination UE or the paired UE. In this embodiment, the destination UE or the paired UE is UE1.

Specifically, the UE2 may use the DRX mode to search for the D2D-capable UE broadcast information other than the UE2 on the specific resources by using the discontinuous reception period (DRX-Cycle), and learn that the UE1 is likely to be paired. After being present, the UE2 receives the information of the UE1 broadcast by the UE1; or, UE2 The information of the UE1 broadcasted by the UE1 may also be received in an event-triggered manner, for example: when the user has certain specific requirements, the receiving action is triggered by the human-machine interface; or the application layer is configured according to the user's previously customized requirements profile. Trigger the receiving action. Of course, the UE2 can also use the DRX and the event triggering in combination to receive the information of the UE1 broadcast by the UE1.

Then, UE2 finds that the information of UE1 matches the requirement of UE2, and UE2 initiates the establishment of a direct D2D connection with UE1. First, the UE 2 transmits an RRC Connection Setup Request message to the serving base station.

104. The UE2 receives an RRC connection setup response message sent by the serving base station.

105. The UE2 sends an RRC connection setup complete message to the serving base station.

In this embodiment, the D2D capability information of UE2 is carried in the foregoing RRC connection setup complete message.

The service request (Service Request) signaling of the UE2; the D2D capability information of the UE2 is used to indicate that the UE2 supports the D2D function. Further, the RRC connection setup complete message may further carry the NAS ID of the UE1 (for example, old GUTI or s-TMSI) and the AS ID. Alternatively, the RRC connection setup complete message may further carry the service code of the UE1. In this way, the serving base station can learn that the UE2 initiates a D2D connection establishment process, and can learn the identity of the connection object (ie, UE1).

For the step 103 to step 105, the RRC connection setup complete message carries the value of the D2D capability information of the UE2 and/or the establishment cause cell of the RRC connection setup request message as a D2D connection.

In addition, one or all of the foregoing RRC connection setup complete message and the RRC connection setup request message carry the NAS ID (eg, old GUTI or s-TMSI) and the AS ID of the UE1; or the RRC connection setup complete message and the foregoing RRC connection. One or all of the setup request messages carry the service code of UE1.

106. The serving base station forwards the foregoing service request signaling to a Mobility Management Entity (MME).

In this embodiment, before the serving base station forwards the service request (Service Request) signaling of the non-access stratum to the MME, optionally, the serving base station may perform admission decision control. Further, the serving base station may send a measurement configuration of the link of the UE2 to the UE1 and/or the link of the UE2 to the serving base station to the UE2, and determine whether to establish according to the measurement result reported by the UE2 after being measured according to the measurement configuration. D2D type bearer and communication.

107. After receiving the foregoing service request signaling, the MME performs an authentication and authentication process.

If the authentication is passed, the MME initiates a context establishment process, thereby triggering the establishment of the bearer. Cheng. The MME performs an interaction operation with the UE2 and the HSS (Home Subscriber Server) in the authentication and authentication process.

Specifically, the mapping of the DPS bearer to the radio bearer may be performed by a Packet Data Network Gateway (PGW) according to the current LTE technology, for example, completing an Internet Protocol (IP) address of the DPS bearer. Other bearer management functions such as allocation and management of Quality of Service (QoS).

108. The MME sends an initial context setup request message to the serving base station to activate all EPS-bearing radio bearers and S1 bearers.

Specifically, the initial context setup message includes a D2D connection indication (P2D).

109. The serving base station performs mapping of the DPS bearer to the radio bearer.

A radio bearer (Radio Bearer) is used to transmit a DPS-bearing data packet between two UEs. If a radio bearer exists, there is a one-to-one mapping relationship between a DPS bearer and a radio bearer. Between two UEs, one DPS bearer uniquely identifies a service flow group with common QoS characteristics. The packet filtering rule is associated with a unique packet filtering identifier in each connection and is sent out in a signaling similar to the NAS procedure. A DPS bearer is a collection of all the packet filtering rules in this bearer.

The service flow groups with the same QoS feature are mapped to the same DPS bearer. For example, the foregoing QoS features may include: a scheduling policy, a queuing management policy, a speed shaping policy, and a radio link control (RLC) management. .

110. The serving base station sends an Initial Context Setup Complete/Response message to the MME.

Specifically, after completing the mapping of the DPS bearer to the radio bearer, the serving base station sends an RRC reconfiguration request message to the UE2, and receives an RRC reconfiguration complete message sent by the UE2. After receiving the RRC reconfiguration complete message sent by the UE2, the serving base station completes the mapping of the DPS bearer to the radio bearer. The serving base station then sends a reply message to the MME.

111. The MME sends an Update Bearer Request message to the gateway (Gateway; GW).

112. The MME receives an Update Bearer Response (Update Bearer Response) message sent by the GW. 113. The MME sends a first message to the serving base station. In this embodiment, the first message is used to trigger the serving base station to send a message to the UE1, so that the UE1 and the network side device establish a connection. The first message may be a paging message or a new message, and the first message carries a "D2D connection" type, and the identifier of the UE (in this embodiment, UE2) that triggers the D2D communication and the UE that needs to establish a connection ( In this embodiment, it is the identifier of UE1).

Taking the above-mentioned first message as a paging message as an example, in this embodiment, a new "D2D connection" type and an identifier of a UE that triggers the current D2D communication are added to the paging message sent by the existing MME to the serving base station. For example, the UE that triggers the current D2D communication is the UE2, where the identifier of the UE that triggers the current D2D communication is an identifier that the serving base station can recognize.

114. The serving base station sends a second message to UE1.

In this embodiment, the foregoing second message is used to trigger the UE1 to establish a connection with the network side device. The second message may be a paging message or a newly designed message format carrying the "D2D connection" type and the identity of the UE (in this embodiment, UE2) that triggers the D2D communication.

Taking the foregoing second message as a paging message as an example, the present embodiment adds a "D2D connection" type indication and an identifier of the UE that triggers the current D2D communication on the basis of the paging message sent by the existing serving base station to the UE. In this embodiment, the UE that triggers the current D2D communication is the UE2, where the identifier of the UE that triggers the current D2D communication is an identifier that the serving base station can recognize. The above "D2D Connection" type indication may be an explicit indication or an implicit indication of the newly added cell.

115. The UE1 initiates a connection establishment process with the network side device.

After the UE1 receives the second message sent by the serving base station, the UE establishes a connection establishment process with the network side device. In this process, the process of establishing the DPS bearer of the UE1 is similar to the process of establishing the DPS bearer of the UE2. For details, refer to the descriptions of Steps 107 to 110, and details are not described herein. Optionally, UE1 performs admission control of the connection establishment process first.

Optionally, a default bearer is established between the UE1 and the serving base station.

Optionally, the serving base station may also directly send scheduling information to UE1; subsequently, update the scheduling information for UE1 according to UE1's feedback on the measurement of the D2D connected link.

Optionally, the serving base station may pre-configure resources of the UE1, for example, the semi-static resources used by the UE1 to send/receive, including configuring an offset of the semi-static resources, configuring a period of the semi-static resources, and mixing for semi-persistent scheduling. The number of Hybrid Automatic Repeat Request (HQQ) processes and the resources used to send Acknowledgement (ACK)/Negative-Acknowledgment (NACK); 116. UE1 initiates connection establishment with UE2. Optionally, after the UE1 completes the connection establishment with the serving base station, the UE1 initiates a connection establishment with the UE2.

Specifically, the UE1 first sends a D2D link setup request message to the UE2, where the D2D link setup request message carries: an identifier of the UE1 (D-RNTI or the physical identifier of the UE1) and an identifier of the UE2 (the physical identifier of the D-RNTI or the UE2). And the channel state information (CSI) information of the UE1, for example: Modulation and Coding Scheme (MCS), coding rate (code rate), and/or precoding matrix indicator (Precoding Matrix Indexes) ; PMI ); and resource allocation (if the serving base station does not deliver configuration information such as Time Division Duplexing (TDD) ratio.

After receiving the D2D link setup request message, the UE2 may further perform access control. If the connection is allowed to be established, the UE2 replies to the UE1 with a D2D link setup response message, where the D2D link setup response message carries the identifier of the UE2. (D-RNTI or physical identity of UE2) and the identity of UE1 (D-RNTI or physical identity of UE1); and CSI information of the UE2, such as: MCS, code rate and/or PMI, etc.; and resource allocation acceptance or rejection . The resource allocation acceptance or rejection refers to UE2 accepting or rejecting the resource allocation of UE1, optionally carrying the cause value or the recommended resource allocation manner.

Finally, after receiving the D2D link setup response message sent by the UE2, the UE1 sends a D2D link setup complete message to the UE2.

117. The DPS bearer setup between UE1 and UE2 is completed. UE1 and UE2 start D2D communication. In this embodiment, if the serving base station does not send the dynamic scheduling information, the UE1 and the UE2 may perform scheduling negotiation or self-scheduling according to the measurement of the link of the D2D connection, and update the opposite end according to the measurement result. The scheduling information of the UE.

In the foregoing embodiment, the serving base station may be an evolved NodeB (eNB). The embodiment of the present invention is not limited thereto. The embodiment of the present invention does not limit the form of the base station.

The foregoing embodiment can implement a DPS bearer between UEs supporting D2D functions, and implement communication between UEs supporting D2D functions, thereby implementing controllability of resources on the network.

The above embodiment describes the establishment of a D2D communication. The following describes the switching mode of D2D communication and conventional communication in the embodiment of the present invention based on the establishment of the above D2D communication.

FIG. 2 is a flowchart of a communication switching method according to an embodiment of the present invention. As shown in FIG. 2, the communication switching method in this embodiment may specifically include the following steps:

200. The UE receives the D2D working cycle time frequency of the D2D communication between the UE and the UE transmitted by the base station. Resource

In this embodiment, the time-frequency resource can indicate the D2D duty cycle of the D2D communication. For example, the time-frequency resource may be specifically carried in the scheduling information sent by the base station to the UE.

In this embodiment, the D2D working period and the working period in which the UE communicates with the base station are all controlled by the base station, and the D2D working period and the working period in which the UE communicates with the base station are staggered in time. For example, in the embodiment, the D2D working period and the working period in which the UE communicates with the base station are mutually staggered in time, and the D2D communication between the UE and the traditional communication between the UE and the base station can be effectively staggered and alternately performed. In the process of ensuring D2D communication, the conventional communication between UE1 and UE2 and the base station can be performed normally.

201. The UE performs D2D communication with another UE in a D2D working period according to the time-frequency resource.

202. When the D2D working period ends, the UE pauses D2D communication with another UE.

203. The UE enters a working period in which the UE communicates with the base station, and performs communication with the base station.

In this embodiment, the working period in which the UE communicates with the base station is synchronized with the working period in which the other UE communicates with the base station. That is to say, the working timings of communication between the two UEs (ie, the UE and another UE) and the base station are exactly the same, so that the working timing of the communication between the two UEs and the base station can be ensured, and the working timing of the D2D communication between the two UEs is completely completed. The same, thereby ensuring D2D communication between two UEs, and traditional communication between the two UEs and the base station can be performed normally.

In this embodiment, when the current D2D working period in which the UE performs D2D communication with another UE ends, the UE suspends D2D communication with another UE; at this time, the UE enters a current working period for communicating with the base station, and the UE and the base station Communication is performed to implement D2D communication switching of the UE to conventional communication between the UE and the base station.

The communication switching method of this embodiment can perform the D2D communication between two UEs and the traditional communication between the two UEs and the base station by using the foregoing technical solution, thereby making up for the deficiencies of the prior art and providing a The switching scheme of the D2D communication and the traditional communication can effectively ensure the traditional communication between the two UEs and the base station in the process of D2D communication, so that the switching efficiency of the D2D communication and the traditional communication can be effectively ensured.

Optionally, on the basis of the technical solution of the embodiment shown in FIG. 2, the following extended technical solutions may be further included to form an extended embodiment of the embodiment shown in FIG. 2. In the extended embodiment, the UE enters a working period in which the UE communicates with the base station in step 202, and the UE communicates with the base station, which may include: the UE reports a data buffer status report to the base station, where the data buffer status report carries the D2D transmission remaining. An indication of the amount of data. In this case, when the UE transmits data to another UE in the D2D communication, that is, in the D2D communication between the UE and another UE, the UE serves as the transmitting data side and the other UE serves as the receiving data side. For example, the amount of data remaining in the D2D transmission can be indicated in three ways:

The first type may be an indication of the amount of remaining data with or without buffering, that is, an indication of 0 or 1 may be used, 1 indicating that the remaining amount of data to be buffered needs to be transmitted, 0 indicating that the amount of remaining data that is not buffered needs to be transmitted; For the indication of the magnitude of the remaining data of the cache, an indication of the amount of remaining data of the buffer may also be specified; for example, reference may be made to the magnitude indication of the buffer status report in the LTE system shown in Table 1 below.

The third type of data that can be specifically cached, such as xxxbytes, etc.

Optionally, if the UE is in the D2D communication with the other UE, the other UE is the transmitting data party, and the UE is the receiving data party, and the other UE reports the buffer status report to the base station.

Table 1

I3/:i O 906s8il£ 98s/-6oiAV

Inch

LL > I3/:i O 906s8il£ 98s/-6oiAV

I3/:i O 906s8il£ 98s/-6oiAV

150000

31 967 < BS <=1132 63 BS > 150000 Further optionally, based on the technical solution of the foregoing extended embodiment, the UE in step 202 enters a working period in which the UE communicates with the base station, and the UE communicates with the base station, further It can also include the following steps:

(1) The UE transmits a 3D4D measurement report to the base station; in this embodiment, the UE is not limited to other measurement reports on the base station; and/or

(2) the UE sends uplink data to the base station; and/or

(3) the UE receives the paging message sent by the base station; and/or

(4) The UE receives downlink data sent by the base station.

The D2D measurement report reported by the UE to the base station is the detection of the signal quality in the D2D communication process between the UE and another UE in the D2D communication, for example, the D2D measurement report carries information such as path loss used to characterize the D2D communication quality. In actual applications, the communication between the UE and the base station may include other information of the UE and the base station in the prior art in addition to the foregoing four cases.

Further, optionally, on the basis of the technical solution of the foregoing extended embodiment, in the communication switching method, when the UE and the base station are in communication, when the UE and another UE satisfy the condition for continuing D2D communication, the UE further The time-frequency resource of the next D2D communication sent by the base station can be received. The next time

The time-frequency resources of the D2D communication can indicate the D2D duty cycle of the next D2D communication. The same reason for the next time

The time-frequency resource of the D2D communication may also be indicated in the scheduling information of the next D2D communication sent by the UE.

For example, the base station may determine, by the base station, whether the UE and another UE satisfy the condition for continuing the D2D communication. Specifically, the base station may determine that the UE and another UE do not have a cell handover (limited to a Connect mode) or a camped cell ( Limited to the idle mode (Idle mode). The signal quality between the UE and the other UE is replaced by the preset threshold of the D2D communication, and the base station determines whether the UE used for transmitting data or the buffer status report reported by another UE is carried. The amount of data remaining in the D2D transmission is not zero. In this case, the base station can determine that the UE and another UE satisfy the condition for continuing the D2D communication. At this time, the base station can allocate the time-frequency resource of the next D2D communication to the UE, and A UE transmits scheduling information of a time-frequency resource carrying the next D2D communication. The corresponding UE receives and acquires the time-frequency resource of the next D2D communication sent by the base station. The signal quality between the UE and another UE can be obtained according to the D2D measurement report. It should be noted that the foregoing determining conditions of the base station may be increased according to the actual situation, and more conditions for determining whether the UE and another UE satisfy the D2D communication are further performed, and details are not described herein again.

Further, optionally, on the basis of the technical solution of the foregoing extended embodiment, when the working period of communication between the UE and the base station ends, the UE and another UE enter a working period of the next D2D communication, and the UE according to the time of the next D2D communication The frequency resource performs D2D communication with another UE. Correspondingly, the UE switches to D2D communication with another UE due to the conventional communication between the base stations.

It should be noted that the D2D connection can be regarded as being maintained when the UE enters the communication cycle with the base station, but the data transmission is temporarily not performed. Under normal circumstances, the UE directly communicates when the next D2D communication starts D2D operation, similar to the UE entering the D2D DRX mode. If the D2D connection stays longer than a certain threshold, the UE needs to maintain the D2D connection, such as the synchronization between the maintenance and another UE, when it returns to the D2D communication next time.

It should be noted that, in the solution of the foregoing embodiment, it is required to ensure that the working period of communication between two UEs and the base station and the working period of D2D communication between two UEs are exactly staggered, and the two UEs communicate with the base station. The period is preferably synchronized, but the working period of communication between the two UEs and the base station is usually different in practical applications. For example, the paging time of the two base stations may also have a large time difference, which is inconvenient for two UEs to communicate with the base station. Synchronize.

Therefore, before step 200 of the foregoing embodiment, the following steps may be further included:

(1) When the difference between the paging occasion of the UE and another UE is greater than a preset threshold, the UE receives the paging timing modification parameter sent by the base station;

The preset threshold here can be 0 or a smaller value close to zero set according to actual demand. The paging timing modification parameter is a modified paging occasion obtained by the base station modifying the original paging occasion of the UE according to the ID of another UE; or the paging timing modification parameter is an ID of another UE.

Further, optionally, when the paging timing modification parameter is the ID of another UE, after the foregoing step (1), before step 200, the following steps may be further included:

(2) The modified paging occasion obtained by the UE modifying the original paging occasion of the UE according to the ID of the other UE.

The UE calculates a new paging frame and a corresponding paging occasion using the ID of another UE according to the following formula: SFN mod T= (T div N)* (UE_ID mod N) Is= floor(UE_ID/N) mod Ns

Here T is the (Discontinuous Reception; DRX) DRX cycle; N is min(T, nB), which is the minimum value in T and nB; and nB is 4T, 2T, T, T/2, T/4, T /8, T/16, T/32; UE ID is equal to the ID mod 1024 of another UE; is the paging occasion; Ns is max(l, nB/T). SFN is the system frame number (SFN), and mod represents the remainder. The modified paging occasion is calculated according to the above two formulas.

The above technical solutions are all examples of modifying the paging occasion of the UE. In actual applications, when the paging occasion of another UE is modified, the above technical solution may also be used to implement the modification.

Through the modification of the paging occasion, the difference between the paging occasions of the two UEs may be less than or equal to a preset threshold, so that the paging occasions of the two UEs may be caused to work in communication between the two UEs and the base station respectively. In the cycle, the work cycle synchronization of communication between the two UEs and the base station is facilitated.

Further optionally, when all D2D communication between the UE and another UE ends, the following steps may also be included:

(a) when the D2D communication is stopped, the UE modifies the paging occasion of the UE to the original paging occasion; (b) the UE sends a first paging occasion modification indication to the base station to instruct the base station to set the paging occasion of the UE user equipment. Change to the original paging opportunity;

Optionally, the following step (c) is further included.

(c) The UE receives the modification success response message fed back by the base station.

The scheme is applicable to the UE-initiated modification of the modified paging occasion to the original paging occasion. Alternatively, when all D2D communication between the UE and another UE ends, the following steps may also be included:

(d) when the D2D communication is stopped, the UE receives the second paging occasion modification indication sent by the base station; (e) the UE modifies the paging occasion to the original paging occasion according to the second paging timing modification indication; optionally further includes Follow the steps (f) below.

(f) The UE sends a modification success response message to the base station.

The scheme is applicable to the modification of the paging occasion initiated by the base station to the original paging occasion. In the communication switching method of the foregoing embodiment, by using the foregoing technical solution, D2D communication between two UEs and traditional communication between two UEs and a base station can be switched, which remedies the shortcomings of the prior art, and provides a The D2D communication and the traditional communication switching scheme can ensure that the traditional communication between the UE and another UE and the base station can be performed normally during the D2D communication, thereby effectively ensuring the switching efficiency of the D2D communication and the traditional communication. FIG. 3 is a flowchart of a communication switching method according to another embodiment of the present invention. As shown in FIG. 3, the communication switching method in this embodiment may specifically include the following steps:

300. The base station configures a time-frequency resource for D2D communication for the UE and another UE, and sends the time-frequency resource to the UE and another UE.

In this embodiment, the time-frequency resource can indicate the D2D duty cycle of the D2D communication.

In this embodiment, the D2D duty cycle and the duty cycle in which the UE or another UE communicates with the base station are staggered in time. For example, in this embodiment, the working period of communication between the UE and the base station is the same as the working period of communication between the UE and the base station, so that the two UEs perform D2D communication or communicate with the base station, and the UE and the other UE are guaranteed. The traditional communication between the D2D communication and the UE or another UE and the base station is effectively performed in the respective corresponding work cycles.

301. When the D2D working period ends, the base station enters a working period in which the base station communicates with the UE and a working period in which the base station communicates with another UE, and communicates with the UE and/or the first UE.

In this embodiment, when the current D2D working period in which the UE performs D2D communication with another UE ends, the base station enters a current working period of communication with the UE and another UE, and the base station starts to communicate with the UE and/or the first UE, thereby implementing The D2D communication between the UE and another UE is switched to the legacy communication between the UE or another UE and the base station. In this embodiment, the working period in which the base station communicates with the UE is synchronized with the working period in which the base station communicates with another UE.

The technical solution of the embodiment is different from the technical solution of the embodiment shown in FIG. 2 in that: the technical solution of the embodiment shown in FIG. 2 describes the technical solution of the embodiment of the present invention on the UE side, and the embodiment is in the base station. The technical solution of the present invention is described on the side. Therefore, the detailed implementation process of this embodiment can also refer to the description of the embodiment shown in FIG. 2, and details are not described herein again.

The communication switching method of this embodiment can perform the D2D communication between two UEs and the traditional communication between the two UEs and the base station by using the foregoing technical solution, thereby making up for the deficiencies of the prior art and providing a The D2D communication and the traditional communication switching scheme can ensure that the traditional communication between the UE and another UE and the base station can be performed normally during the D2D communication, thereby effectively ensuring the switching efficiency of the D2D communication and the traditional communication.

Optionally, on the basis of the technical solution of the embodiment shown in FIG. 3, the following extended technical solutions may be further included to form an extended embodiment of the embodiment shown in FIG. 3. In this extended embodiment, in step 301, "the base station enters a working period in which the base station communicates with the UE and the working period in which the base station communicates with another UE, and the base station communicates with the UE and/or another UE", which may specifically include : Base Station Received in D2D A data buffer status report reported by the UE or another UE for transmitting data in the communication, and the data buffer status report carries an indication of the amount of data remaining in the D2D transmission. For example, the D2D can transmit the remaining data volume in three ways: the first type can be an indication of the amount of remaining data with or without buffering; the second type can be an indication of the magnitude of the remaining data buffered, and the third type can be specific. The amount of data remaining in the cache. The details are the same as those in the subsequent extended embodiment of the embodiment shown in FIG. 2 . For details, refer to the description of the foregoing embodiment, and details are not described herein again. Further, optionally, based on the technical solution of the foregoing extended embodiment, the working period in which the base station enters the base station to communicate with the UE and the working period in which the base station communicates with another UE in the step 301, the base station and the UE and/or The first UE performs communication, and specifically includes the following steps:

(a) the base station receives the D2D measurement report reported by the UE and/or another UE; and/or

(b) the base station receives the uplink data sent by the UE and/or; and/or

(c) the base station sends a paging message to the UE and/or another UE; and/or

(d) The base station transmits downlink data to the UE and/or another UE.

Further, optionally, on the basis of the technical solution of the foregoing extended embodiment, in the process of the base station communicating with the UE or another UE, the base station further needs to determine whether the UE and the other UE can continue to perform D2D communication.

For example, the base station determines whether the UE and another UE have not undergone cell handover or replacement of the camping cell, and the base station determines whether the signal quality between the UE and another UE satisfies the preset quality threshold of the D2D communication and the base station determines that the D2D transmission remains. Whether the amount of data is zero. The signal quality between the UE and another UE can be known from the D2D measurement report.

When the base station determines that neither the UE nor another UE has a cell handover (limited to Connect mode) or a replacement of the camped cell (limited to Idle mode), the base station determines that the signal quality between the UE and another UE satisfies the preset quality of the D2D communication. The value and the base station determine that the amount of data remaining in the D2D transmission is not zero, and the base station determines that the UE can continue D2D communication with another UE; otherwise, when it is determined that the UE and another UE have a cell handover (limited to Connect mode) or a camped cell (limited to Idle) The replacement of the mode, the base station determines that the signal quality between the UE and another UE satisfies the preset quality threshold of the D2D communication, and the base station determines that the remaining data amount of the D2D transmission is zero, the base station can determine the UE and Another UE cannot continue D2D communication.

It should be noted that, in addition to the above three cases, the determining condition that the base station determines whether the UE and another UE can continue to perform D2D communication may be increased according to actual conditions, and may be further derived according to the actual situation. Judging whether the UE and another UE satisfy the condition for continuing D2D communication is not repeated here. Further, optionally, on the basis of the technical solution of the foregoing extended embodiment, when the base station determines that the UE and another UE can continue D2D communication, the base station allocates time-frequency resources of the next D2D communication for the first UE and another UE. Similarly, the time-frequency resource of the next D2D cycle can also be carried in the scheduling information of the next D2D communication.

It should be noted that, for example, the time-frequency resource size allocated by the base station for each D2D communication may be an indication of the remaining data amount that may exist. According to the indication manner of the remaining data amount of the D2D transmission, if there is an indication of the amount of remaining data of the buffer, The fixed-size time-frequency resource allocated by the base station for the next D2D communication.

The base station determines that the next D2D communication needs to be continued, and the base station directly allocates a pre-set size time-frequency resource for the UE and another UE.

Or the time-frequency resource size of the D2D communication may be different for the base station, for example, the amount of data remaining in the D2D transmission may be set, and the indication that the remaining data amount of the D2D transmission may be applied to the specifically cached remaining data. For example, the base station allocates the radio resource of the next D2D working period to the first UE and the other UE, and the method may include: the base station allocates the next D2D communication to the first UE and another UE according to the remaining data amount of the D2D transmission. Time-frequency resources. In this case, the time-frequency resources allocated by the base station to the UE and the other UE for the next D2D communication are uncertain. The time-frequency resources allocated to the two consecutive D2D communications may be the same or different. Specifically, the radio resource allocated for the next D2D working period is the D2D carried in the data buffer status report reported by the UE or another UE when the traditional communication between the UE or another UE and the base station is completed after the current D2D working period ends. The amount of remaining data is transmitted to determine.

Further, optionally, after the base station allocates the time-frequency resource of the next D2D communication, the base station may further include: the base station transmitting the time-frequency resource of the next D2D communication to the UE and the other UE, according to the technical solution of the foregoing embodiment, At the end of the current working period for the base station to communicate with the UE and another UE, the UE and another UE enter the next D2D communication, and the UE and another UE perform D2D communication according to the time-frequency resource of the next D2D communication.

It should be noted that the D2D connection may be considered to be maintained when the UE enters the communication cycle with the base station, but the data transmission is temporarily not performed. Under normal circumstances, the UE directly communicates when the next D2D communication starts and starts D2D operation, similar to the UE entering the D2D DRX mode. If the D2D connection stays longer than a certain threshold, the UE needs to return to the D2D communication the next time. The D2D connection must be maintained first, such as maintenance and synchronization between another UE.

Therefore, before step 300 of the foregoing embodiment, the following steps may be further included:

(1) When the difference between the paging occasion of the UE and another UE is greater than a preset threshold, the base station sends a paging timing modification parameter to the UE; wherein the paging timing modification parameter is the modified paging occasion, or the seeking The call timing modification parameter is an ID of another UE, and is used for the UE to modify according to the original paging occasion of the ID UE of the other UE, and obtain the modified paging occasion;

When the paging timing modification parameter is the modified paging occasion, after the foregoing step (1), before step 300, the following step (2) may be further included:

(2) The base station modifies the original paging occasion of the UE according to the ID of the other UE, and obtains the modified paging occasion.

Further optionally, when the D2D communication is stopped, the following steps may also be included:

(a) When the D2D communication is stopped, the base station changes the paging occasion of the UE to the original paging occasion by the modified paging occasion;

(b) the base station sends a first paging occasion modification indication to the UE, to instruct the UE to change the modified paging occasion to the original paging occasion;

Further, the following step (c) may also be included.

(c) The base station receives the modification success response message sent by the UE.

The scheme is applicable to the modification of the paging occasion initiated by the base station to the original paging occasion. Or further optionally, when the D2D communication is stopped, the following steps may also be included:

(i) when the D2D communication is stopped, the base station receives the second paging occasion modification indication sent by the UE;

( ϋ ) the base station changes the paging occasion of the UE from the modified paging occasion to the original paging occasion according to the second paging timing modification indication;

(iii) The base station sends a modification success response message to the UE.

In the technical solution of the foregoing embodiment, the base station may determine to stop the D2D communication according to the indication of the amount of remaining data transmitted by the D2D. It should be noted that, in the solution of the foregoing embodiment, the paging occasion of the UE is modified as an example. In the actual application, if the paging occasion of another UE is modified, the same manner may be implemented. The extended embodiment of the embodiment shown in FIG. 3 corresponds to the technology of the extended embodiment of the embodiment shown in FIG. 2, and the extended embodiment of the embodiment shown in FIG. 2 is also referred to in detail, and details are not described herein again.

In the communication switching method of the foregoing embodiment, by using the foregoing technical solution, D2D communication between two UEs and traditional communication between two UEs and a base station can be switched, which remedies the shortcomings of the prior art, and provides a The D2D communication and the traditional communication switching scheme can ensure that the traditional communication between the UE and another UE and the base station can be performed normally during the D2D communication, thereby effectively ensuring the switching efficiency of the D2D communication and the traditional communication.

FIG. 4 is a signaling diagram of a communication switching method according to an embodiment of the present invention. As shown in FIG. 4, the communication switching method in this embodiment may specifically include the following steps:

400. During the traditional communication between the UE1 and the base station, the UE1 sends a request to the base station to communicate with the UE2 of the local cell.

401. The base station detects the signal quality between UE1 and UE2, determines that the signal quality between UE1 and UE2 meets a preset quality threshold, and determines that D2D communication can be performed between UE1 and UE2.

The base station detects the paging occasions of the UE1 and the UE2. When the paging occasions of the UE1 and the UE2 are greater than the preset threshold, the paging occasion of one of the paging occasions is modified, so that the working cycles of the communication between the UE1 and the UE2 and the base station are synchronized. ;

For the modification of the paging occasion of one of the base stations, reference may be made to the description of the above embodiment.

403. The base station configures a time-frequency resource of the D2D communication between the UE1 and the UE2, where the time-frequency resource can indicate a D2D working period of the D2D communication, and the working period of the D2D communication between the UE1 and the UE2 and the UE1 and the UE2 respectively communicate with the base station. Work cycles are staggered in time;

The base station sets the D2D working period and the working period in which the UE1 and the UE2 communicate with the base station respectively to ensure that the traditional communication between the UE1 and the UE2 and the base station can be performed normally during the D2D communication.

404. The base station sends scheduling information of the time-frequency resource carrying the D2D communication to the UE1 and the UE2.

405. When the UE1 and the UE2 enter the D2D working period, the UE1 and the UE2 perform the D2D communication according to the time-frequency resource of the D2D communication. For example, in this embodiment, the UE1 sends the data to the UE2 as an example. In the D2D communication, the UE1 sends the message to the UE2. Data

406. When the working period of the D2D communication of the UE1 and the UE2 ends, the UE1 suspends the D2D communication. 407. UE1 and UE2 enter a working period for communicating with the base station.

For example, UE1 and UE2 respectively listen to and receive the paging message sent by the base station; when UE1 and UE2 have uplink data to be transmitted, respectively send uplink data to the base station; when the base station needs downlink data to be sent to UE1 and UE2, the base station separately Send downlink data and the like to UE1 and UE2. At the same time, in the working period in which the UE1 and the UE2 communicate with the base station, the UE1 and the UE2 also need to report the D2D measurement report to the base station, and the UE1 also reports a buffer status report to the base station, where the buffer status report carries the remaining data amount of the D2D transmission. . For the manner of expressing the specific data volume, refer to the foregoing embodiment, and details are not described herein again.

408. In a working period in which the UE1 and the UE2 communicate with the base station, the base station further needs to determine whether the UE1 and the UE2 can continue to perform D2D communication.

For details, refer to the extended embodiment of the embodiment shown in FIG. 3, and details are not described herein again.

409. When the base station determines that UE1 and UE2 can continue D2D communication, the base station allocates time-frequency resources of the next D2D communication.

When the base station determines that UE1 and UE2 cannot continue D2D communication, the D2D communication ends, and UE1 and UE2 communicate with the base station according to the traditional communication mode in the subsequent process.

410. The base station sends the time-frequency resource of the next D2D communication to the UE1 and the UE2. Similarly, the time-frequency resource of the next D2D communication can indicate the working period of the next D2D communication;

411. When the working period in which UE1 and UE2 communicate with the base station ends, UE1 and UE2 enter the next D2D communication, and UE1 and UE2 continue to perform D2D communication on the radio resource of the next D2D period; for example, UE1 is in the radio resource of the next D2D period. Continue to send data to UE2.

Then, it returns to 406-408 until the base station determines that UE1 and UE2 cannot continue D2D communication, D2D communication ends, and UE1 and UE2 communicate with the base station according to the traditional communication manner in the subsequent process.

A person skilled in the art can understand that all or part of the steps of implementing the foregoing method embodiments may be completed by using hardware related to the program instructions, and the foregoing program may be stored in a computer readable memory. In the storage medium, when the program is executed, the steps including the foregoing method embodiments are performed; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk or an optical disk.

FIG. 5 is a schematic structural diagram of a UE according to an embodiment of the present invention. As shown in FIG. 5, the UE in this embodiment may specifically include: a receiving module 10, a first communications module 11, a processing module 12, and a second communications module 13.

The receiving module 10 is configured to receive a time-frequency resource that is sent by the base station to perform D2D communication between the UE and another UE. The time-frequency resource can indicate a D2D working period of the D2D communication. The first communication module 11 is connected to the receiving module 10, which is responsible for D2D communication. The first communication module 11 is configured to perform D2D communication with another UE in a D2D duty cycle according to the time-frequency resource received by the receiving module 10. The processing module 12 is connected to the first communication module 11, and the processing module 12 is configured to suspend D2D communication with another UE when the first communication module 11 performs the D2D duty cycle of D2D communication. The second communication module 13 is connected to the processing module 12, and the second communication module 13 is responsible for the conventional communication between the UE base stations. The second communication module 13 is configured to: when the processing module 12 suspends D2D communication with another UE, enter a current working period in which the UE communicates with the base station, and communicate with the base station. In this embodiment, the working period of the UE communicating with the base station The duty cycle of communication with another UE and the base station is synchronized.

The UE in this embodiment implements the communication switching mechanism by using the above-mentioned modules, and is the same as the implementation of the related method embodiment. For details, refer to the description of the foregoing related method embodiments, and details are not described herein again.

The UE in this embodiment can perform D2D communication between two UEs and traditional communication between two UEs and a base station by using the above module, which compensates for the deficiencies of the prior art and provides an effective D2D communication. The switching scheme of the traditional communication can ensure the traditional communication between the two UEs and the base station in the process of D2D communication, so that the switching efficiency of the D2D communication and the traditional communication can be effectively ensured.

Optionally, on the basis of the technical solution of the embodiment shown in FIG. 5, the following expansion technical solution may be further included to form an extended embodiment of the embodiment shown in FIG. 5. In the extended embodiment, the second communication module 13 is specifically configured to report a data buffer status report to the base station after the UE enters a working period in which the UE communicates with the base station, where the data buffer status report carries an indication of the remaining data amount of the D2D transmission. .

Or further optionally, the second communication module 13 is further configured to: when the processing module 12 suspends D2D communication with another UE, the UE enters a working period of communicating with the base station, and measures a report to the base station; and/ Or

The second communication module 13 is further configured to: when the processing module 12 suspends D2D communication with another UE, the UE enters a working period of communicating with the base station, and sends uplink data to the base station; and/or The second communication module 13 is further configured to: when the processing module 12 suspends D2D communication with another UE, the UE enters a working period for communicating with the base station, and receives a paging message sent by the base station; and/or the second communication module 13 further Specifically, when the processing module 12 suspends D2D communication with another UE, the UE enters a working period for communicating with the base station, and receives downlink data sent by the base station.

Further, optionally, based on the technical solution of the foregoing extended embodiment, the second communication module 13 is further configured to: when the UE and another UE satisfy the condition for continuing D2D communication, receive the next D2D communication sent by the base station. The frequency resource, the time-frequency resource of the next D2D communication can indicate the working period of the next D2D communication.

Further, optionally, based on the technical solution of the foregoing extended embodiment, the first communication module 11 is further configured to: when the current working period of the UE communicating with the base station ends, the UE enters a working cycle of the next D2D communication, and according to the next The time-frequency resource of one D2D communication performs the next D2D communication with another UE.

Further, optionally, the first communication module 11 in the foregoing embodiment is further configured to: when the receiving module 10 receives the time-frequency resource that the UE sends the UE to perform D2D communication with another UE, the paging occasion of the UE and another UE The paging timing modification parameter sent by the receiving base station when the difference is greater than the preset threshold; the paging timing modification parameter is the modified paging obtained by the base station modifying the original paging occasion of the UE according to the ID of another UE Timing; or the paging timing modification parameter is an ID of another UE;

The processing module 12 is further configured to: when the paging timing received by the first communication module 11 modifies the parameter to the ID of another UE, and modify the original paging occasion according to the ID of the other UE, the modified paging occasion is obtained. .

Further, the processing module 12 is configured to: when the D2D communication is stopped, modify the paging occasion of the UE to the original paging occasion; the second communication module 13 is further configured to send the first paging timing modification indication to the base station, to Instructing the base station to modify the paging occasion of the UE to the original paging occasion; the second communication module 13 is further configured to receive the modification success response message fed back by the base station.

Further, the second communication module 13 is further configured to: when the D2D communication is stopped, receive a second paging occasion modification indication sent by the base station; the processing module 12 is further configured to modify the paging occasion according to the second paging timing modification indication. The original paging occasion is used; the second communication module 13 is further configured to send a modification success response message to the base station.

The UE in the foregoing embodiment is the same as the implementation of the foregoing method embodiment by using the foregoing module. For details, refer to the description of the foregoing related method embodiments, and details are not described herein again.

The UE of the above embodiment can perform D2D communication and two UEs by using the above modules. The switching of the traditional communication between the UE and the base station compensates for the deficiencies of the prior art, and provides an effective D2D communication and traditional communication switching scheme, which can ensure the process of D2D communication between two UEs and the base station. The conventional communication can be performed normally, so that the switching efficiency of D2D communication and conventional communication can be effectively ensured.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station in this embodiment may specifically include: a configuration module 20 and a communication module 21.

The configuration module 20 is configured to configure a time-frequency resource for D2D communication for the UE and another UE, and the time-frequency resource of the D2D communication can indicate a D2D duty cycle of the D2D communication. The communication module 21 is configured to send the time-frequency resources configured by the configuration module 20 to the UE and another UE, so that the UE and another UE perform D2D communication in the D2D work cycle. The communication module 21 is further configured to end the D2D duty cycle, the base station enters a working period in which the base station communicates with the UE, and a working period in which the base station communicates with another UE, and communicates with the UE and/or the first UE; wherein the base station communicates with the UE The duty cycle is synchronized with the duty cycle in which the base station communicates with another UE.

The base station of the present embodiment is the same as the implementation of the related method embodiment by using the above-mentioned modules. For details, refer to the description of the related method embodiments, and details are not described herein.

The base station in this embodiment can perform the D2D communication between the two UEs and the traditional communication between the two UEs and the base station by using the above module, which makes up for the deficiencies of the prior art and provides an effective D2D communication. The switching scheme of the traditional communication can ensure the traditional communication between the two UEs and the base station in the process of D2D communication, so that the switching efficiency of the D2D communication and the traditional communication can be effectively ensured.

FIG. 7 is a schematic structural diagram of a base station according to another embodiment of the present invention. The embodiment shown in FIG. 7 may further include the following technical solutions on the basis of the technical solution of the embodiment shown in FIG.

In this embodiment, the communication module 21 is specifically configured to receive, during a working period in which the base station enters the base station to communicate with the UE, and a working period in which the base station communicates with another UE, and receive a data buffer status report reported by the UE, where the data buffer status report is carried. D2D transfers the amount of data remaining.

Or, further optionally, the communication module 21 is specifically configured to receive a D2D measurement report reported by the UE during a working period in which the base station enters the base station to communicate with the UE and a working period in which the base station communicates with another UE; and/or

The communication module 21 is specifically configured to receive, according to a working period in which the base station enters the base station to communicate with the UE, and a working period in which the base station communicates with another UE, to receive uplink data sent by the UE; and/or The communication module 21 is specifically configured to send a paging message to the UE in a working period in which the base station enters the base station to communicate with the UE and a working period in which the base station communicates with another UE; and/or

The communication module 21 is specifically configured to send downlink data to the UE in a working period in which the base station enters the base station to communicate with the UE and a working period in which the base station communicates with another UE.

Optionally, the base station in this embodiment further includes a determining module 22, and the determining module 22 is connected to the communication module 21. The determining module 22 is configured to determine whether the UE and the other UE can continue D2D communication during the working period in which the communication module 21 communicates with the base station.

For example, the determining module 22 is specifically configured to determine whether the UE and another UE have not undergone cell handover or replacement of the camping cell, and determine whether the signal quality between the UE and another UE satisfies the preset quality of the D2D communication. And determining whether the amount of data remaining in the D2D transmission is zero; when the determining module 22 determines that no cell handover or replacement of the camping cell occurs between the UE and another UE, determining that the signal quality between the UE and another UE satisfies the D2D communication The preset quality threshold and determining that the amount of data remaining in the D2D transmission is not zero, the determining module 22 determines that the UE can continue D2D communication with another UE; otherwise, the determining module 22 determines that the UE cannot continue D2D communication with another UE.

Optionally, the base station in this embodiment further includes a configuration module 20 further configured to determine, by the determining module 22

The UE and the other UE can continue D2D communication, and allocate the time-frequency resource of the next D2D communication to the UE and another UE, and the time-frequency resource of the next D2D communication can indicate the working period of the next D2D communication.

For example, the configuration module 20 is specifically configured to allocate a time-frequency resource of the next D2D communication to the UE and another UE according to the indication of the amount of data remaining in the D2D transmission.

Further, optionally, the communication module 21 in the base station of the embodiment is further configured to send the time-frequency resource of the next D2D communication to the UE and/or another UE, for a working period in which the base station communicates with the UE and another UE. At the end, the UE and another UE enter the D2D working period of the next D2D communication, and the UE and another UE perform D2D communication according to the time-frequency resource of the next D2D communication.

The base station of this embodiment may further include a modification module 23. The communication module 21 is further configured to: when the configuration module 20 configures the time-frequency resource of the D2D communication for the UE that satisfies the D2D communication condition and another UE, when the difference between the paging occasion of the UE and another UE is greater than a preset threshold And sending a paging occasion modification parameter to the UE, where the paging timing modification parameter is a modified paging occasion, or the paging timing modification parameter is an ID of another UE, and is used by the UE according to another UE ID pair. The original paging occasion of the UE is modified to obtain a modified paging occasion. The modification module 23 is configured to: when the paging timing modification parameter is the modified paging occasion, before the communication module 21 sends the paging opportunity modification parameter to the UE, the original paging moment of the UE is modified according to the ID of the other UE, and is modified. Post paging timing. The modification module 23 is connected to the communication module 21.

Further, the modifying module 23 is further configured to: when the D2D communication is stopped, modify the paging occasion of the UE from the modified paging occasion to the original paging occasion. The communication module 21 is further configured to send a first paging occasion modification indication to the UE, to instruct the UE to modify the modified paging occasion to the original paging occasion. The communication module 21 is further configured to receive a modification success response message sent by the UE.

Alternatively, the communication module 21 is further configured to: when the D2D communication is stopped, receive a second paging occasion modification indication sent by the UE; and the modifying module 23 is configured to: according to the second paging timing modification indication received by the communication module 21, The paging occasion of the UE is modified to the original paging occasion by the modified paging occasion; the communication module 21 is further configured to send a modification success response message to the UE.

The above modification module 23 receives the paging occasion of the UE as an example to receive the technical solution of the present invention. In an actual application, when the paging occasion of another UE needs to be modified, the modification may also be performed in the foregoing manner.

The technical solution of the present invention is to introduce the technical solution of the present invention by using all the optional technical solutions mentioned above. In an actual application, the foregoing optional technical solution may constitute an embodiment of the present invention in any combination, in detail. I will not repeat them here.

The base station of this embodiment can perform D2D communication between two UEs and two by using the above module.

The switching of the traditional communication between the UE and the base station compensates for the deficiencies of the prior art, and provides an effective D2D communication and traditional communication switching scheme, which can ensure the process of D2D communication between two UEs and the base station. The conventional communication can be performed normally, so that the switching efficiency of D2D communication and conventional communication can be effectively ensured.

FIG. 8 is a schematic structural diagram of a communication switching system according to an embodiment of the present invention. As shown in FIG. 8, the communication system of this embodiment includes two UEs 30 and one base station 40, and the D2D communication conditions are satisfied between the two UEs 30. Two UEs can perform communication connection to implement D2D communication, and two UEs can respectively communicate with the base station to implement traditional communication.

The two UEs 30 in this embodiment may use the UE described in the foregoing embodiment of FIG. 5 or FIG. The base station 40 can employ the base station shown in FIG. 6 or FIG. 7 described above. For details, please refer to the above shown in Figure 5 - Figure 7. The description of the embodiment, and the description of the embodiment of the communication switching method shown in FIG. 2 to FIG. 4, realizes switching of D2D communication between two UEs and conventional communication between two UEs and a base station.

The communication switching system of the present embodiment is the same as the implementation of the related method embodiment by using the foregoing UE and the base station. For details, refer to the description of the foregoing related method embodiments, and details are not described herein again.

The communication switching system of this embodiment can make up for the D2D communication between two UEs and the traditional communication between the two UEs and the base station by using the foregoing UE and the base station, thereby making up for the deficiencies of the prior art, and providing a The switching scheme of the D2D communication and the traditional communication can effectively ensure the traditional communication between the two UEs and the base station in the process of D2D communication, so that the switching efficiency of the D2D communication and the traditional communication can be effectively ensured.

The device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. Or it can be distributed to at least two network elements. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A communication switching method, comprising:

The user equipment enters a working period in which the user equipment communicates with the base station, and communicates with the base station; a working period in which the user equipment communicates with the base station, and the another user equipment and the base station The work cycle for communication is synchronized.

The method according to claim 1, wherein the user equipment enters a working period in which the user equipment communicates with the base station, and communicates with the base station, including:

The user equipment reports a data buffer status report to the base station, where the data buffer status report carries an indication of the amount of remaining data transmitted by the D2D.

The method according to claim 2, wherein the user equipment enters a working period in which the user equipment communicates with the base station, and communicates with the base station, and further includes:

The user equipment reports to the base station 3⁄4D2D; and/or

Transmitting, by the user equipment, uplink data to the base station; and/or

Receiving, by the user equipment, a paging message sent by the base station; and/or

The user equipment receives downlink data sent by the base station.

4. The method according to claim 1, further comprising:

When the user equipment and the other user equipment meet the condition for continuing D2D communication, the user equipment receives a time-frequency resource of the next D2D communication sent by the base station; and the time-frequency resource of the next D2D communication A D2D duty cycle capable of indicating the next D2D communication.

5. The method according to claim 4, further comprising:

When the working period of the communication between the user equipment and the base station ends, the user equipment enters the next D2D working period, and performs the next user equipment according to the time-frequency resource of the next D2D communication. Describe the next D2D communication.

The method according to any one of claims 1-5, wherein the user equipment receives a base Before the time-frequency resource of the current D2D communication between the user equipment and the other user equipment, the method further includes:

When the difference between the paging occasion of the user equipment and the other user equipment is greater than a preset threshold, the user equipment receives a paging timing modification parameter sent by the base station; the paging timing modification parameter is a modified paging occasion obtained by the base station modifying the original paging occasion of the user equipment according to the ID of the another user equipment;

And before the user equipment receives the time-frequency resource that is sent by the base station and the other user equipment to perform current D2D communication, the method further includes: a difference between a paging occasion of the user equipment and the another user equipment When the user equipment is greater than the preset threshold, the user equipment receives the paging opportunity modification parameter sent by the base station; the paging timing modification parameter is the ID of the another user equipment; and the method further includes: the user equipment according to the user equipment The modified paging occasion obtained by modifying the original paging occasion of the user equipment by the ID of the other user equipment.

The method according to claim 6, wherein the method further comprises: when the D2D communication is stopped, the user equipment modifies a paging occasion of the user equipment to the original paging occasion;

Transmitting, by the user equipment, a first paging occasion modification indication to the base station, to instruct the base station to modify a paging occasion of the user equipment to the original paging occasion;

Or, when the D2D communication is stopped, the user equipment receives a second paging occasion modification indication sent by the base station;

The user equipment modifies the paging occasion to the original paging occasion according to the second paging occasion modification indication.

8. A communication switching method, comprising:

9. The method according to claim 8, wherein the base station enters the base station and the location The working period in which the user equipment communicates and the working period in which the base station communicates with the another user equipment, and communicates with the user equipment and/or the another user equipment, including:

The base station receives a data buffer status report reported by the user equipment or the another user equipment, where the data buffer status report carries an indication of the amount of data remaining in the D2D transmission.

The method according to claim 9, wherein the base station enters a working period in which the base station communicates with the user equipment, and a working period in which the base station communicates with the another user equipment, and Communicating with the user equipment and/or the another user equipment, the method further includes: receiving, by the base station, a D2D measurement report reported by the user equipment and/or the another user equipment; and/or

Receiving, by the base station, uplink data sent by the user equipment and/or the another user equipment; and/or

Sending, by the base station, a paging message to the user equipment and/or the another user equipment; and/or the base station transmitting downlink data to the user equipment and/or the another user equipment.

The method according to claim 10, further comprising:

Determining, by the base station, whether the user equipment and the another user equipment can continue to perform D2D communication;

When the base station determines that the user equipment and the another user equipment can continue to perform D2D communication, the base station allocates time-frequency resources of the next D2D communication to the user equipment and the another user equipment; The time-frequency resource of one D2D communication can indicate the D2D duty cycle of the next D2D communication.

The method according to claim 11, wherein the determining, by the base station, whether the user equipment and the another user equipment can continue to perform D2D communication, includes:

Determining, by the base station, whether the user equipment and the another user equipment do not have a cell handover or a replacement of a camping cell, and the base station determines whether a signal quality between the user equipment and the another user equipment is satisfied. a preset quality threshold of the D2D communication and the base station determining whether the amount of data remaining in the D2D transmission is zero; when the base station determines that neither the user equipment nor the another user equipment has a cell handover or a camping cell Replacement, the base station determines that the signal quality between the user equipment and the another user equipment satisfies a preset quality threshold of D2D communication, and the base station determines that the amount of data remaining in the D2D transmission is not zero. The base station determines that the user equipment and the another user equipment can continue D2D communication.

The method according to any one of claims 8 to 12, wherein, before the base station configures the time-frequency resource of the D2D communication for the user equipment and the other user equipment, the method further includes:

When the difference between the paging occasion of the user equipment and the other user equipment is greater than a preset threshold, the base station sends a paging timing modification parameter to the user equipment;

The paging timing modification parameter is a modified paging occasion, or

The paging timing modification parameter is an ID of the another user equipment, where the user equipment performs modification on the original paging occasion of the user equipment according to the ID of the other user equipment, and is modified. Paging opportunity.

The method according to claim 13, wherein the method further comprises: when stopping D2D communication, the base station modifies a paging occasion of the user equipment by the modified paging occasion For the original paging opportunity;

Sending, by the base station, a first paging occasion modification indication to the user equipment, to indicate that the user equipment modifies the modified paging occasion to the original paging occasion;

Or the method further includes:

Receiving, by the base station, a second paging occasion modification indication sent by the user equipment, when the D2D communication is stopped;

And the base station, according to the second paging opportunity modification indication, modifying the paging occasion of the user equipment from the modified paging occasion to the original paging occasion.

15. A user equipment, comprising:

a first communication module, configured to perform the D2D communication with the another user equipment according to the time-frequency resource received by the receiving module in the D2D working period;

a processing module, configured to suspend the D2D communication with the another user equipment when the D2D work cycle of the first communication module performs D2D communication ends;

a second communication module, configured to: when the processing module suspends the D2D communication with the another user equipment, enter a working period in which the user equipment communicates with the base station, and communicate with the base station; The duty cycle in which the user equipment communicates with the base station is synchronized with the duty cycle in which the other user equipment communicates with the base station.

16. The user equipment according to claim 15, wherein: The second communication module is specifically configured to report a data buffer status report to the base station, where the data buffer status report carries an indication of the amount of remaining data transmitted by the D2D.

17. The user equipment according to claim 16, wherein:

The second communication module is further configured to send a measurement report to the base station; and/or the second communication module is further configured to send uplink data to the base station; and/or the second communication The module is further configured to receive a paging message sent by the base station; and/or the second communication module is further configured to receive downlink data sent by the base station.

18. The user equipment according to claim 15, wherein:

The second communication module is configured to: when the user equipment and the another user equipment meet the condition for continuing D2D communication, receive a time-frequency resource of the next D2D communication sent by the base station; the next D2D The time-frequency resources of the communication can indicate the D2D duty cycle of the next D2D communication.

19. The user equipment of claim 18, wherein:

The first communication module is further configured to: when a working period in which the user equipment communicates with the base station ends, the user equipment enters a working period of the next D2D communication, and according to the next D2D communication The time-frequency resource performs the next D2D communication with the another user equipment.

20. The user equipment according to any one of claims 15-19, characterized in that:

The second communication module is further configured to: before the receiving module receives a time-frequency resource that is sent by the base station to perform D2D communication with another user equipment, when the user equipment and the another user equipment When the difference of the paging occasion is greater than the preset threshold, the paging timing modification parameter sent by the base station is received; the paging timing modification parameter is that the base station is original to the user equipment according to the ID of the another user equipment. The modified paging occasion obtained by modifying the paging occasion;

Or the second communication module is further configured to: before the receiving module receives the time-frequency resource that is sent by the base station to perform D2D communication with another user equipment, when the user equipment and the another user equipment When the difference of the paging occasion is greater than the preset threshold, the paging timing modification parameter sent by the receiving base station is received; the paging timing modification parameter is the ID of the another user equipment;

The processing module is further configured to: when the paging timing modification parameter is an ID of the another user equipment, modify the original paging occasion of the user equipment according to the ID of the another user equipment. Changed paging timing.

21. The user equipment according to claim 20, wherein:

The processing module is configured to modify a paging occasion of the user equipment when stopping D2D communication For the original paging opportunity;

The second communication module is further configured to send a first paging occasion modification indication to the base station, to indicate that the base station changes a paging occasion of the user equipment to the original paging occasion;

Or

The second communication module is further configured to: when the D2D communication is stopped, receive a second paging occasion modification indication sent by the base station;

The processing module is further configured to modify a paging occasion to the original paging occasion according to the second paging occasion modification indication.

22. A base station, comprising:

a configuration module, configured to configure a time-frequency resource of the D2D communication for the user equipment and another user equipment; the time-frequency resource can indicate a D2D working period of the D2D communication;

23. The base station according to claim 22, wherein:

The communication module is configured to receive a data buffer status report reported by the user equipment or the another user equipment, where the data buffer status report carries an indication of the amount of data remaining in the D2D transmission.

24. The base station of claim 23, wherein:

The communication module is specifically configured to receive the user equipment after a working period in which the base station enters the communication between the base station and the user equipment, and a working period in which the base station communicates with the another user equipment / or D2D measurement report reported by the other user equipment; and / or

The communication module is specifically configured to receive the user equipment after a working period in which the base station enters the communication between the base station and the user equipment, and a working period in which the base station communicates with the another user equipment / or uplink data sent by the other user equipment; and / or

The communication module is specifically configured to: when the base station enters the base station, communicate with the user equipment. Sending a paging message to the user equipment and/or the another user equipment after a working period of the communication and a working period in which the base station communicates with the another user equipment; and/or

The communication module is specifically configured to: after the base station enters a working period in which the base station communicates with the user equipment, and a working period in which the base station communicates with the another user equipment, to the user equipment and / or the other user equipment sends downlink data.

The base station according to claim 24, further comprising:

a determining module, configured to determine whether the user equipment and the another user equipment can continue to perform D2D communication;

The configuration module is further configured to: when the determining module determines that the user equipment and the another user equipment can continue D2D communication, and allocate the next D2D communication to the user equipment and the another user equipment Frequency resource; The time-frequency resource of the next D2D communication can indicate the D2D duty cycle of the next D2D communication.

26. The base station of claim 25, wherein:

The determining module is specifically configured to determine whether the user equipment and the another user equipment do not have a cell handover or a replacement of a camping cell, and determine a signal quality between the user equipment and the another user equipment. Whether the preset quality threshold of the D2D communication is satisfied and whether the amount of data remaining in the D2D transmission is determined to be zero; when it is determined that the user equipment and the another user equipment do not have a cell handover or a replacement of the resident cell, determining Determining, by the user equipment and the another user, that the signal quality between the user equipment and the another user equipment meets a preset quality threshold of D2D communication and determines that the amount of data remaining in the D2D transmission is not zero. The device can continue D2D communication.

The base station according to any one of claims 22 to 26, further comprising a modification module, wherein the communication module is further configured to configure, by the configuration module, a time frequency of D2D communication for the user equipment and another user equipment. Before the resource, when the difference between the paging occasion of the user equipment and the another user equipment is greater than a preset threshold, the paging timing modification parameter is sent to the user equipment; wherein the paging timing modification parameter is The modified paging occasion, or the paging timing modification parameter is an ID of the another user equipment, for the user equipment to initially page the user equipment according to the ID of the other user equipment Make changes to get the modified paging opportunity.

28. The base station of claim 27, wherein:

The modifying module is configured to modify, when the D2D communication is stopped, the paging occasion of the user equipment, by the modified paging occasion, to the original paging occasion; The communication module is further configured to send a first paging occasion modification indication to the user equipment, to instruct the user equipment to modify the modified paging occasion to the original paging occasion; The communication module is further configured to receive a second paging occasion modification indication sent by the user equipment when the D2D communication is stopped;

The modifying module is configured to modify, according to the second paging occasion modification indication, the paging occasion of the user equipment from the modified paging occasion to the original paging occasion.