CN103249095A

CN103249095A - Data sending and receiving method, user equipment, base station and gateway

Info

Publication number: CN103249095A
Application number: CN2012100275240A
Authority: CN
Inventors: 常俊仁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-02-08
Filing date: 2012-02-08
Publication date: 2013-08-14
Anticipated expiration: 2032-02-08
Also published as: CN103249095B; WO2013117128A1

Abstract

The invention provides a data sending method, a data receiving method, user equipment, a base station and a gateway, wherein the data sending method comprises the following steps: sending a data packet to second UE (User Equipment) by first UE in a D2D(Dimension To Dimension) mode, sending a switchover instruction by a first UE receiving base station, and sending a first data packet unsuccessfully sent to the second UE and follow-up data packets to the base station by the first UE in a D2D mode to be transmitted to the second UE by the base station. Through the adoption of the technical scheme the switchover of the mutual communicated UE between a cell mode and the D2D mode is finished.

Description

Data sending, receiving method, subscriber equipment, base station and gateway

Technical field

The present invention relates to the communication technology, relate in particular to a kind of data sending, receiving method, subscriber equipment, base station and gateway.

Background technology

At present communication network is more and more, for example subzone network, WLAN (wireless local area network) (Wireless Local Area Network, WLAN), bluetooth (BlueTooth, BT) etc.In subzone network, subscriber equipment (User Equipment, when UE) communicating with other UE, need pass through the base station, for example Long Term Evolution (Long Term Evolution, LTE) evolution base station in the network (evolved NodeB, eNB), carry out centralized control, this communication pattern is called as the communication of residential quarter (cell) pattern.Communication between UE is the use of the Radio Resource that the base station can the centralized control residential quarter through the benefit of base station control, well disturbs control.But in some cases, for example two UE still carry out centralized control by the base station and then can bring waste of radio resources under closer situation.For example, transmit same data volume, two close UE of distance directly communicate, and compare the central controlled communication pattern in base station, can save the Radio Resource of half.

Along with the continuous development of intelligent terminal, need in-plant transfer of data between the increasing UE, for example carry out sharing of data, mutual blit sheet, business card etc. all is typical short-range communication.Therefore how in subzone network, use the mandate frequency range of operator to carry out that the straight-through transmission of data more and more comes into one's own between the UE.But, if the distance between UE and the UE during greater than certain scope, will have between UE and the UE communicate by the base station under the centralized control of base station.Therefore, straight-through (Device to Device D2D) communicates the present urgent problem of being switching to of pattern to the UE that how to make mutually intercommunication between pattern and the cell pattern at equipment.

Summary of the invention

The embodiment of the invention provides a kind of data sending, receiving method, subscriber equipment, base station and gateway, in order to finish the switching of UE between cell pattern and D2D pattern of intercommunication mutually.

The embodiment of the invention provides a kind of data transmission method for uplink on the one hand, comprising:

First user equipment (UE) sends packet to the 2nd UE with the straight-through D2D pattern of equipment;

What a described UE received that the base station sends switches to the switching command of cell pattern by the D2D pattern;

A described UE will send to described base station by first packet and follow-up packet that does not successfully send to described the 2nd UE under the D2D pattern.

The embodiment of the invention provides a kind of subscriber equipment on the one hand, comprising:

First sending module is used for sending packet to the 2nd UE with the straight-through D2D pattern of equipment;

First receiver module, what be used for to receive that the base station sends switches to the switching command of cell pattern by the D2D pattern;

Second sending module is used for and will sends to described base station by first packet and follow-up packet that does not successfully send to described the 2nd UE under the D2D pattern.

The embodiment of the invention provides a kind of data transmission method for uplink on the one hand in addition, comprising:

The base station sends the switching command that is switched to cell pattern by the straight-through D2D pattern of equipment to first user equipment (UE), switches to by described base station to described the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE to indicate a described UE;

Described base station receives a described UE under the D2D pattern that a described UE sends, and first does not successfully send to PDCP PDCP packet and the subsequent P DCP packet of described the 2nd UE, described subsequent P DCP packet comprises that described first successfully do not send to PDCP packet all PDCP packets afterwards of described the 2nd UE, comprises that perhaps the described PDCP packet that first does not successfully send to described the 2nd UE does not successfully send to the PDCP packet of described the 2nd UE afterwards;

Described base station sends to the PDCP packet that a described UE sends gateway and receives the Internet protocol IP packet that described gateway issues, and the IP allocation of packets PDCP sequence number that issues for described gateway then is packaged into the PDCP packet again with the IP packet that described gateway is issued;

Described base station sends to described the 2nd UE with the described PDCP packet that is packaged into again.

The embodiment of the invention provides a kind of base station on the one hand, comprising:

The 4th sending module, be used for sending the switching command that is switched to cell pattern by the straight-through D2D pattern of equipment to first user equipment (UE), switch to by described base station to described the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE to indicate a described UE;

The 3rd receiver module, first does not successfully send to PDCP packet and the subsequent P DCP packet of described the 2nd UE for a described UE under the D2D pattern who receives described UE transmission, described subsequent P DCP packet comprises that described first successfully do not send to PDCP packet all PDCP packets afterwards of described the 2nd UE, comprises that perhaps the described PDCP packet that first does not successfully send to described the 2nd UE does not successfully send to the PDCP packet of described the 2nd UE afterwards;

First package module, be used for the PDCP packet that a described UE sends is sent to gateway and receives the Internet protocol IP packet that described gateway issues, the IP allocation of packets PDCP sequence number that issues for described gateway then is packaged into the PDCP packet again with the IP packet that described gateway is issued;

The 5th sending module is used for the described PDCP packet that is packaged into is again sent to described the 2nd UE.

The embodiment of the invention provides a kind of data receive method on the one hand, comprising:

What gateway reception base station sent sends to the Internet protocol IP packet of the 2nd UE by first user equipment (UE), and records the order that receives described IP packet; Wherein, the described IP packet PDCP PDCP packet that to be described base station send a described UE carries out decapsulation and obtains, and described IP packet comprises the sign of a described UE and the sign of described the 2nd UE;

Described gateway is handled described IP packet, and issues IP packet after the processing to described base station according to the order that records.

The embodiment of the invention provides a kind of gateway on the one hand, comprising:

The 18 receiver module, what be used for the transmission of reception base station sends to the Internet protocol IP packet of the 2nd UE by first user equipment (UE), and records the order that receives described IP packet; Wherein, the described IP packet PDCP PDCP packet that to be described base station send a described UE carries out decapsulation and obtains, and described IP packet comprises the sign of a described UE and the sign of described the 2nd UE;

The 21 sending module is used for described IP packet is handled, and issues IP packet after the processing to described base station according to the order that records.

The embodiment of the invention provides a kind of data transmission method for uplink on the other hand in addition, comprising:

The base station sends the switching command that is switched to cell pattern by the straight-through D2D pattern of equipment to a UE, switches to by described base station to described the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE to indicate a described UE;

Described base station receives a described UE under the D2D pattern that a described UE sends, and first does not successfully send to the packet of described the 2nd UE and follow-up packet;

Described base station directly is transmitted to described the 2nd UE with the packet that a described UE sends.

The embodiment of the invention provides a kind of base station on the other hand, comprising:

The tenth sending module is used for sending the switching command that is switched to cell pattern by the straight-through D2D pattern of equipment to a UE, switches to by described base station to described the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE to indicate a described UE;

The 8th receiver module, first does not successfully send to the packet of described the 2nd UE and follow-up packet for a described UE under the D2D pattern who receives described UE transmission;

The 11 sending module is used for the packet that a described UE sends directly is transmitted to described the 2nd UE.

The another aspect of the embodiment of the invention provides a kind of data transmission method for uplink, comprising:

First user equipment (UE) sends PDCP PDCP packet to the base station;

What a described UE received that described base station sends switches to the switching command of the straight-through D2D pattern of equipment by cell pattern;

A described UE will send to described the 2nd UE with the D2D pattern at first PDCP packet and subsequent P DCP packet that does not successfully send to described the 2nd UE under the cell pattern.

The another aspect of the embodiment of the invention provides a kind of subscriber equipment, comprising:

The 12 sending module is used for the packet to base station transmission PDCP PDCP;

The 9th receiver module, what be used for reception described base station transmission switches to the switching command that equipment leads directly to the D2D pattern by cell pattern;

The 13 sending module is used for and will sends to described the 2nd UE with the D2D pattern at first PDCP packet and subsequent P DCP packet that does not successfully send to described the 2nd UE under the cell pattern.

The another aspect of the embodiment of the invention provides a kind of data transmission method for uplink in addition, comprising:

The base station receives the PDCP PDCP packet that first user equipment (UE) sends, and the PDCP packet that a described UE is sent sends to gateway and receives the Internet protocol IP packet that PDCP packet that described gateway sends according to described base station issues;

Described base station is the IP allocation of packets PDCP sequence number that described gateway issues, and is packaged into the PDCP packet again with the IP packet that described gateway is issued;

Described base station sends to described the 2nd UE with the described PDCP packet that is packaged into again;

Described base station sends the switching command that is switched to the straight-through D2D pattern of equipment by cell pattern to a described UE, will send to described the 2nd UE with the D2D pattern to indicate a described UE at first PDCP packet and subsequent P DCP packet that does not successfully send to described the 2nd UE under the cell pattern according to described switching command.

The another aspect of the embodiment of the invention provides a kind of base station, comprising:

The 13 receiver module, be used for to receive the PDCP PDCP packet that first user equipment (UE) sends, the PDCP packet that a described UE is sent sends to gateway and receives the Internet protocol IP packet that PDCP packet that described gateway sends according to described base station issues;

Second package module, the IP allocation of packets PDCP sequence number that is used to described gateway to issue is packaged into the PDCP packet again with the IP packet that described gateway is issued;

The 14 sending module is used for the described PDCP packet that is packaged into is again sent to described the 2nd UE;

The 15 sending module, be used for sending the switching command that is switched to the straight-through D2D pattern of equipment by cell pattern to a described UE, will send to described the 2nd UE to indicate a described UE in first PDCP packet and subsequent P DCP packet one D2D pattern that does not successfully send to described the 2nd UE under the cell pattern according to described switching command.

Data sending, receiving method, subscriber equipment, base station and gateway that the embodiment of the invention provides on the one hand, the one UE directly sends packet to the 2nd UE, after the base station switches to the switching command of cell pattern to UE transmission from the D2D pattern, the one UE begins to send packet by the base station to the 2nd UE from first packet that successfully is not transferred to the 2nd UE, the packet that the base station earlier sends a UE sends to gateway and sends to the 2nd UE again after via gateway processes, thereby has finished a UE and the 2nd UE switching to the cell communication pattern from the D2D communication pattern.

The data transmission method for uplink that the embodiment of the invention provides on the other hand and base station, the one UE directly sends the PDCP packet to the 2nd UE, after the base station switches to the switching command of cell pattern to UE transmission from the D2D pattern, the one UE begins to send the PDCP packet by the base station to the 2nd UE from first PDCP packet that successfully is not transferred to the 2nd UE, the base station directly is transmitted to the 2nd UE with the PDCP packet that a UE sends, thereby has finished a UE and the 2nd UE switching to the cell communication pattern from the D2D pattern.

Data transmission method for uplink, subscriber equipment and base station that the another aspect of the embodiment of the invention provides, the one UE sends the PDCP packet by the base station to the 2nd UE, after the base station switches to the switching command of D2D pattern to UE transmission from cell pattern, the one UE begins to send the PDCP packet with the D2D pattern to the 2nd UE from first PDCP packet that successfully is not transferred to the 2nd UE, thereby has finished a UE and the switching of the 2nd UE from cell pattern to the D2D pattern.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The flow chart of the data transmission method for uplink that Fig. 1 provides for one embodiment of the invention;

The flow chart of the data transmission method for uplink that Fig. 2 provides for another embodiment of the present invention;

The flow chart of the data receive method that Fig. 3 provides for one embodiment of the invention;

The flow chart of the data processing method that Fig. 4 A provides for one embodiment of the invention;

The UE that Fig. 4 B provides for one embodiment of the invention sends to the schematic diagram of the PDCP packet of the 2nd UE;

The 2nd UE that Fig. 4 C provides for one embodiment of the invention receives the schematic diagram of the PDCP packet of a UE;

The flow chart of the data processing method that Fig. 5 provides for another embodiment of the present invention;

The flow chart of the data processing method that Fig. 6 provides for further embodiment of this invention;

The flow chart of the data processing method that Fig. 7 provides for further embodiment of this invention;

The flow chart of the data processing method that Fig. 8 provides for further embodiment of this invention;

The flow chart of the data processing method that Fig. 9 provides for further embodiment of this invention;

The flow chart of the data processing method that Figure 10 provides for further embodiment of this invention;

The flow chart of the data transmission method for uplink that Figure 11 provides for further embodiment of this invention;

The flow chart of the data transmission method for uplink that Figure 12 provides for further embodiment of this invention;

The flow chart of the data transmission method for uplink that Figure 13 provides for further embodiment of this invention;

The flow chart of the data transmission method for uplink that Figure 14 provides for further embodiment of this invention;

The flow chart of the data receive method that Figure 15 provides for further embodiment of this invention;

The flow chart of the data processing method that Figure 16 provides for further embodiment of this invention;

The structural representation of the UE that Figure 17 A provides for one embodiment of the invention;

The structural representation of the UE that Figure 17 B provides for another embodiment of the present invention;

The structural representation of the base station that Figure 18 A provides for one embodiment of the invention;

The structural representation of the base station that Figure 18 B provides for another embodiment of the present invention;

The structural representation of the UE that Figure 19 A provides for further embodiment of this invention;

The structural representation of the UE that Figure 19 B provides for further embodiment of this invention;

The structural representation of the UE that Figure 20 A provides for further embodiment of this invention;

The structural representation of the UE that Figure 20 B provides for further embodiment of this invention;

The structural representation of the base station that Figure 21 A provides for further embodiment of this invention;

The structural representation of the base station that Figure 21 B provides for further embodiment of this invention;

The structural representation of the UE that Figure 22 A provides for further embodiment of this invention;

The structural representation of the UE that Figure 22 B provides for further embodiment of this invention;

The structural representation of the base station that Figure 23 A provides for further embodiment of this invention;

The structural representation of the base station that Figure 23 B provides for further embodiment of this invention;

The structural representation of the UE that Figure 24 A provides for further embodiment of this invention;

The structural representation of the UE that Figure 24 B provides for further embodiment of this invention;

The structural representation of the gateway that Figure 25 provides for one embodiment of the invention.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

The flow chart of the data transmission method for uplink that Fig. 1 provides for one embodiment of the invention.As shown in Figure 1, the method for present embodiment comprises:

Step 101, a UE (subscriber equipment) send packet to the 2nd UE with the straight-through D2D pattern of equipment.

What this step 101 was described is that a UE and the 2nd UE adopt the D2D pattern to communicate.

Wherein, can set up the Ud carrying between a UE and the 2nd UE.Ud carrying refers to that a UE and the 2nd UE directly carry out data transmit-receive and the carrying of setting up.

After Ud carrying foundation was finished, (Internet Protocol, IP) data envelope was dressed up corresponding packet to a UE, directly by the Ud link packet that is packaged into is sent to the 2nd UE then with the Internet protocol in the communication service.

What step 102, a UE received that the base station sends switches to the switching command of cell pattern by the D2D pattern.

In the present embodiment, the base station manages the communication process between a UE and the 2nd UE.When needs communicated the switching of pattern, the base station can send switching command to a UE and/or the 2nd UE.In the present embodiment, described switching command is used for making a UE and the 2nd UE that the communication pattern that uses is switched to cell pattern by the D2D pattern.

Illustrate, if a UE and the 2nd UE are mobile mutually, distance each other is more and more far away, communicates and will cause serious data to lose or can't re-use the D2D pattern and communicate the time, switching command can be sent to a UE and/or the 2nd UE in the base station as far as re-using the D2D pattern.

Step 103, a UE will be under the D2D pattern first successfully do not send to the packet of the 2nd UE and follow-up packet sends to the base station.

Wherein, first does not successfully send to the packet of packet first UE transmission that does not successfully receive of the 2nd UE just of the 2nd UE, is the packet of first bust this in the transmission data procedures.

After a UE received switching command, a UE and the 2nd UE all can set up the Uu carrying with the base station.Wherein, Uu carrying is that data transmit-receive is carried out and the carrying of setting up in a UE or the 2nd UE and base station.Wherein, the process how a UE and the 2nd UE set up the Uu carrying with the base station respectively belongs to prior art, is not described in detail in this.

Then, a UE does not successfully send to the packet of the 2nd UE from first, sends first by the base station to the 2nd UE and does not successfully send to the packet of the 2nd UE and follow-up packet.Wherein, a UE can directly send to the base station with the packet of being dressed up by the IP data envelope, the IP packet that encapsulates is encapsulated, and then send to the base station.In this process, a UE can send packet according to the order of sequence to the base station.

Receive the packet of UE transmission when the base station after, send to gateway after packet is reduced to the IP packet, by gateway the IP packet is handled, receive the treated IP packet that gateway issues then, and then send to the 2nd UE after the IP data envelope that gateway issues dressed up corresponding packet.Perhaps the packet that also can be directly a UE be sent of base station is transmitted to the 2nd UE, and report gateway not.

In the present embodiment, first and second UE uses the D2D pattern to communicate, receive the switching command of base station transmission as a UE after, the one UE can begin to send packet by the base station to the 2nd UE from first packet that does not successfully send to the 2nd UE, and no longer directly send packet to the 2nd UE, finished the switching from the D2D pattern to cell pattern.

Wherein, a UE specifically comprises with the packet that the D2D pattern sends to the 2nd UE: a UE sends PDCP (Packet Data Convergence Protocol, PDCP) packet to the 2nd UE with the D2D pattern.Accordingly, first does not successfully send to the packet of the 2nd UE and follow-up packet comprises: first does not successfully send to PDCP packet and the subsequent P DCP packet of the 2nd UE.

Wherein, first PDCP packet (i.e. first UE who does not successfully receive of the 2nd UE send PDCP packet) that does not successfully send to the 2nd UE comprises that the 2nd UE receives but the PDCP packet that makes a mistake also comprises the PDCP packet that the 2nd UE does not receive.The one UE and the 2nd UE all can be known a UE, and first does not successfully send to the PDCP packet of the 2nd UE or the PDCP packet that first UE who does not successfully receive of the 2nd UE sends.Particularly, the 2nd UE can be when receiving the pattern switching command, to the accepting state of UE feedback PDCP packet.

Wherein, described subsequent P DCP packet can be included in all PDCP packets after first PDCP packet that does not successfully send to the 2nd UE, namely comprises the PDCP packet that successfully sent to the 2nd UE after first PDCP packet that does not successfully send to the 2nd UE, sends to the 2nd UE but successfully do not send to the PDCP packet that the PDCP packet Buddhist monk of the 2nd UE did not send to the 2nd UE.Perhaps, described subsequent P DCP packet comprises the PDCP packet that does not successfully send to the 2nd UE after first PDCP packet that does not successfully send to the 2nd UE, namely comprises after first PDCP packet that does not successfully send to the 2nd UE sending to the 2nd UE but successfully not sending to the PDCP packet that the PDCP packet Buddhist monk of the 2nd UE do not send to the 2nd UE (namely not never having the PDCP packet that sent to the 2nd UE after first successfully sends to the PDCP packet of the 2nd UE).

Sending the PDCP packet with a UE below is example, illustrate that the base station receives the handling process of the PDCP packet of UE transmission: after the base station receives the PDCP packet of UE transmission, the PDCP packet is carried out decapsulation obtain wherein IP packet, the IP packet that according to the order of sequence deblocking is gone out then sends to gateway and for gateway processing such as traffic statistics, charging is carried out in the communication between the one UE and the 2nd UE.Then, the base station receives the IP packet that gateway issues, and the IP packet encapsulation that again gateway is issued is to send to the 2nd UE behind the PDCP packet.

In this explanation, decapsulation can be carried out to the PDCP packet after receiving the PDCP packet in the base station, the IP packet that then deblocking is taken on sends to gateway, thus in embodiments of the present invention everywhere described and " base station sends to gateway with the PDCP packet " similarly description refer to that in fact the IP packet that the base station will deblocking takes on from the PDCP packet sends to gateway.

Wherein, the PDCP sequence number of PDCP packet can guarantee the transmission according to the order of sequence of PDCP packet.So the IP allocation of packets PDCP sequence number that the base station can issue for gateway, so that can send the PDCP packet to the 2nd UE according to the order of sequence.

In the present embodiment, the one UE and the 2nd UE use the D2D pattern to communicate, receive the switching command of base station transmission as a UE after, the one UE can begin to send the PDCP packet by the base station to the 2nd UE from first PDCP packet that does not successfully send to the 2nd UE, and no longer directly send the PDCP packet to the 2nd UE, finished the switching from the D2D pattern to cell pattern.

The flow chart of the data transmission method for uplink that Fig. 2 provides for another embodiment of the present invention.As shown in Figure 2, the method for present embodiment comprises:

Step 201, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE, switch to by the base station to the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE to indicate a UE.

Before this, a UE directly sends the PDCP packet to the 2nd UE with the D2D pattern.The communication process between a UE and the 2nd UE is detected in the base station.Finding a UE and the 2nd UE when the base station need communicate by the base station, when namely needing to use cell pattern, sends switching command to a UE and/or the 2nd UE.

In the present embodiment, described switching command is used for making a UE and the 2nd UE that the communication pattern that uses is switched to cell pattern by the D2D pattern, even a UE switches to by the base station to the 2nd UE transmission PDCP packet from directly sending the PDCP packet to the 2nd UE.

Step 202, base station receive a UE under the D2D pattern that a UE sends, and first does not successfully send to PDCP packet and the subsequent P DCP packet of the 2nd UE.

Concrete, after a UE received the switching command of base station transmission, a UE began to send the PDCP packet by the base station to the 2nd UE from first PDCP packet that does not successfully send to the 2nd UE.Wherein, first PDCP packet that does not successfully send to the 2nd UE of UE PDCP packet of sending of first UE who does not successfully receive of the 2nd UE just.Wherein, the PDCP packet that first UE who does not successfully receive of the 2nd UE sends comprises that the 2nd UE receives but the PDCP packet that makes a mistake also comprises the PDCP packet that the 2nd UE does not receive.The one UE and the 2nd UE all can be known a UE, and first does not successfully send to the PDCP packet of the 2nd UE or the PDCP packet that first UE who does not successfully receive of the 2nd UE sends.Wherein, subsequent P DCP packet comprises all the PDCP packets after first PDCP packet that does not successfully send to the 2nd UE, comprises that perhaps first PDCP packet that does not successfully send to the 2nd UE does not successfully send to the PDCP packet of the 2nd UE afterwards.

Before a UE sent the PDCP packet to the base station, a UE and the 2nd UE set up the Uu carrying with the base station respectively.Then a UE sends the PDCP packet by the carrying of the Uu between itself and the base station to the base station.The process of setting up of Uu carrying belongs to prior art, is not described in detail in this.

Step 203, base station send to the PDCP packet that a UE sends gateway and receive the IP packet that gateway issues, and the IP allocation of packets PDCP sequence number that issues for gateway is encapsulated as the PDCP packet again with the IP packet that gateway is issued then.

The base station receives after the PDCP packet of UE transmission, the PDCP packet is carried out decapsulation obtain the IP packet, the order that the IP packet that then deblocking is come out sends the PDCP packet according to a UE sends to gateway and for gateway processing such as traffic statistics, charging is carried out in the communication between the one UE and the 2nd UE.

Then, the base station receives the IP packet that IP packet that gateway sends according to the base station that receives issues.Wherein, gateway is separate with the base station to the order that gateway device sends the IP packet to the order of base station transmission IP packet.But in general, the IP packet that gateway sends to the base station is identical with the IP packet that the base station sends to gateway.

Then, the PDCP packet is dressed up with the IP data envelope that gateway issues in the base station.Wherein, the IP packet that base station encapsulation gateway issues is in the process of PDCP packet, and the base station need be IP allocation of packets PDCP sequence number.

The PDCP packet that step 204, base station will be packaged into again sends to the 2nd UE.

The IP data envelope that the base station issues gateway is dressed up after the PDCP packet, and the PDCP packet that is packaged into is again sent to the 2nd UE.Concrete, the base station is carried with Uu between the 2nd UE by it PDCP packet is sent to the 2nd UE.

In the present embodiment, the base station detects when needing to use cell pattern to communicate between a UE and the 2nd UE, send switching command to a UE, the one UE switches to cell pattern according to switching command from the D2D pattern, namely send the PDCP data by the base station to the 2nd UE, thereby finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE.

The flow chart of the data receive method that Fig. 3 provides for one embodiment of the invention.As shown in Figure 3, the method for present embodiment comprises:

Step 301, the 2nd UE receive the PDCP packet that a UE directly sends.

What this step 301 was described is that a UE and the 2nd UE use the D2D pattern to communicate.That is the one set up the Ud carrying between UE and the 2nd UE, a UE by its with the 2nd UE between the Ud carrying directly to the 2nd UE transmission PDCP packet.Accordingly, the 2nd UE receives the PDCP packet that a UE directly sends by the Ud link between itself and the UE.

Concerning the 2nd UE, can receive the PDCP packet in proper order according to the PDCP sequence number of PDCP packet.If in DRP data reception process, the 2nd UE finds that PDCP packet or the RLC packet (the PDCP packet that for example makes a mistake or the PDCP packet of losing or RLC packet) that fails and receive arranged, the 2nd UE can feed back to a UE, or send packet loss and heavily change request, and a UE can transmit PDCP packet or the RLC packet that the 2nd UE fails and receives again according to feedback or the packet loss repeat requests of the 2nd UE.Particularly, before emergence pattern switches (just normal D2D direct transfer process in), it still is that the RLC packet embodiment of the invention does not limit that a UE retransmits the PDCP packet to the 2nd UE.

Step 302, the 2nd UE receive the PDCP packet that the base station sends.

Wherein, the PDCP packet that the base station sends to the 2nd UE be the base station to a UE send switch to the switching command of cell pattern by the D2D pattern after, first does not successfully send to the UE that a UE is sent the PDCP packet of the 2nd UE and subsequent P DCP packet send to gateway and PDCP packet that gateway is sent according to the base station issues IP packet and encapsulates again and form.In the present embodiment, subsequent P DCP packet comprises a UE, and first does not successfully send to PDCP packet all PDCP packets afterwards of the 2nd UE, comprises that perhaps first PDCP packet that does not successfully send to the 2nd UE of a UE does not successfully send to the PDCP packet of the 2nd UE afterwards.

This step 302 mainly is to switch to communication process behind the cell pattern from the communication pattern that the angle of the 2nd UE is described between a UE and the 2nd UE by the D2D pattern.Under cell pattern, a UE earlier sends to the base station with the PDCP packet, after base station and gateway are done further processing, sends to the 2nd UE by the base station again.

Wherein, the communication pattern between a UE and the 2nd UE mainly is subjected to the control of base station.When the base station is found to need to use cell pattern to communicate between a UE and the 2nd UE, the base station sends switching command to a UE and/or the 2nd UE, and a UE switches to by the base station to the 2nd UE transmission PDCP packet from directly sending the PDCP packet to the 2nd UE with the D2D pattern according to switching command.Wherein, the one UE by the base station to the process that the 2nd UE sends the PDCP packet mainly is: a UE sends the PDCP packet from the PDCP packet (first does not successfully send to the PDCP packet of the 2nd UE to comprise a UE) that first does not successfully send to the 2nd UE to the base station, the PDCP packet that the base station sends a UE carries out decapsulation and obtains the IP packet, then the IP packet is sent to gateway according to a UE sends order from the PDCP packet to the base station; Gateway carries out processing such as traffic statistics, charging according to the IP packet that the base station sends to the communication between a UE and the 2nd UE, issues the IP packet then to the base station.Wherein, to issue the order of each IP packet be separate with the base station to the order that gateway sends each IP packet to the base station to gateway.Then, the base station is that the IP allocation of packets PDCP sequence number that gateway issues is packaged into the PDCP packet again with the IP packet that gateway is issued, and the PDCP packet that will be packaged into again at last sends to the 2nd UE.

In the present embodiment, the 2nd UE receives the PDCP packet that a UE directly sends earlier, when the communication pattern between a UE and the 2nd UE switches to cell pattern by the D2D pattern, the 2nd UE receives the PDCP packet that a UE sends to the 2nd UE by the base station, the 2nd UE and the UE switching that is combined into the communication pattern between a UE and the 2nd UE that matches provides condition, makes the communication pattern of win UE and the 2nd UE switch to cell pattern by the D2D pattern.

In above-mentioned data transmission method for uplink or data receive method flow process, the handoff procedure of the communication pattern between a UE and the 2nd UE just solves the problem that the PDCP packet is transmitted.Wherein, because the Uu carrying between the carrying of the Uu between a UE and the base station and the 2nd UE and the base station is separate, so a UE sends to the base station according to certain PDCP sequence number order with the PDCP packet, and it is mutual independence that the Uu carrying between base station use and the 2nd UE sends between the PDCP packet to the 2nd UE according to certain PDCP sequence number according to the order of sequence, therefore, the base station sends to the order of IP packet of gateway and the order of the IP packet that gateway is handed down to the base station also is independently.That is to say, the one UE sends between the PDCP sequence number of the PDCP sequence number of PDCP packet of base station and the PDCP packet that the base station sends to the 2nd UE does not have positive connection, and the IP packet that two PDCP packets that the PDCP sequence number is identical comprise might not be identical.When the PDCP sequence number of the PDCP packet of the PDCP sequence number of the PDCP packet that sends of a UE who receives as the 2nd UE and the base station transmission that receives was identical like this, packet loss might take place.Because the needs of some business, be highstrung for the packet loss of packet.Therefore, how to guarantee in the communication pattern handoff procedure to guarantee that packet is not lost or the packet loss of packet is reduced to alap level is a key factor that influences the communication pattern quality of handoff.

At the problems referred to above, it is several when realizing that communication patterns between a UE and the 2nd UE switch to cell pattern from the D2D pattern that following examples of the present invention provide, and further guarantees packet loss not or reduce the method for packet loss as far as possible.

The flow chart of the data processing method that Fig. 4 A provides for one embodiment of the invention.Shown in Fig. 4 A, the method for present embodiment comprises:

Step 401, a UE directly send the PDCP packet to the 2nd UE.

This step 401 can be referring to the description of step 101.

Step 402, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE; The one UE receives the switching command that the base station sends.

This step 402 can be referring to the description of step 201 and step 102.

The PDCP packet that step 403, the 2nd UE will successfully receive after the PDCP packet that the current UE that first does not successfully receive sends sends to a UE, and the PDCP packet deletion that will successfully receive after the PDCP packet that first UE who does not successfully receive sends.

Usually, if a UE successfully sends to the 2nd UE with the PDCP packet, for example, a UE receives affirmation (Ack) information that the 2nd UE returns, and a UE can delete this PDCP packet from buffer memory, so that improve operating factor of memory space.In order to prevent that the UE from can't obtain the PDCP packet that has successfully sent to the 2nd UE after first does not successfully send to the PDCP packet of the 2nd UE, the 2nd UE will return to a UE by the successful PDCP packet that receives in the present embodiment after the PDCP packet that first UE who does not successfully receive sends, and so just guarantee that a UE can successfully get access to first PDCP packet that does not successfully send to the 2nd UE each PDCP packet afterwards.

Wherein, will to return to the PDCP packet deletion that success receives after PDCP packet that first UE who successfully receives sends of a UE be the reception that repeats for fear of packet to the 2nd UE.

Present embodiment illustrates a UE by diagramatic way, and first does not successfully send to the PDCP packet of the 2nd UE, and the PDCP packet that sends of first UE who does not successfully receive of the 2nd UE and the relation between each PDCP packet afterwards.Shown in Fig. 4 B, it is the PDCP packet that a UE sends to the 2nd UE according to the order of sequence.Wherein, the packet of PDCP shown in the frame of broken lines refers to a UE, and first does not successfully send to the PDCP packet of the 2nd UE, and its PDCP sequence number is 3.Shown in Fig. 4 C, be that the 2nd UE receives the PDCP packet that a UE sends according to the order of sequence.Wherein, PDCP packet shown in the frame of broken lines is the PDCP packet that first UE who does not successfully receive of the 2nd UE sends, its sequence number is 3, and the PDCP sequence number of the PDCP packet shown in the solid box above the frame of broken lines is respectively 4,5,6, and the PDCP sequence number of PDCP packet is respectively 1,2 shown in the solid box below the frame of broken lines.Wherein, the PDCP sequence number be 4,5,6 PDCP packet be the 2nd UE fail receive the PDCP sequence number be 3 PDCP packet after the PDCP packet of a UE of success reception.

In this step, the 2nd UE needs will be after the PDCP sequence number be 3 PDCP sequence number, and the PDCP sequence number that receives is that 4,5,6 PDCP packet returns to a UE, and deletion PDCP sequence number is 4,5,6 PDCP packet.And a UE need be that 3 PDCP packet begins to send the PDCP packet by the base station to the 2nd UE from the PDCP sequence number, be about to the PDCP sequence number and be 3 and thereafter all PDCP packets send to the 2nd UE by the base station.

Step 404, a UE send to the base station with the PDCP sequence number that first does not successfully send to the PDCP packet of the 2nd UE.

In this explanation, the execution sequence of above-mentioned steps 403 and step 404 is not done restriction.

Step 405, a UE successfully do not send to the PDCP packet of the 2nd UE from first, and first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station.

In the present embodiment, subsequent P DCP packet comprises a UE first does not successfully send to all PDCP packets after the PDCP packet of the 2nd UE.

Step 406, base station receive the PDCP packet that a UE sends, and the PDCP packet that receives is carried out decapsulation obtain the IP packet.

Step 407, base station send to gateway with the IP packet according to a UE sends order from the PDCP packet to the base station.

Step 408, gateway are handled the IP packet that the base station sends, and again the IP packet are handed down to the base station then.

First PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE is encapsulated as the PDCP packet for the IP allocation of packets PDCP sequence number that gateway issues again with the IP packet that gateway is issued since a UE for step 409, base station.

Suppose that in step 407 UE sends the PDCP sequence number to the base station be 3,4,5,6 PDCP packet, and the IP sequence number of the IP packet that the PDCP packet comprises successively is 6,7,8,9, and then the base station can be that 6,7,8,9 IP packet sends to gateway in regular turn with the IP sequence number.

Accordingly, the IP packet that the hypothesis gateway issues to the base station successively in step 408 is that the IP sequence number is 8,9,7,6 IP packet.

Wherein, first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE of a UE is 3.Then in step 409, it is 8,9,7,6 IP allocation of packets PDCP sequence number 3,4,5,6 that the base station can be followed successively by the IP sequence number.Wherein, the 2nd UE receives according to the order that the PDCP sequence number carries out packet.Concerning the 2nd UE, will receive the PDCP sequence number and be followed successively by 3,4,5,6, and the IP sequence number is followed successively by 8,9,7,6 packet.

In the present embodiment, the base station IP allocation of packets PDCP sequence number that first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE issues for gateway since a UE, be outside the PDCP packet in the IP packet encapsulation that gateway is issued, it is mutually continuous that the PDCP sequence number that can also make the PDCP packet that is packaged into again and a UE have successfully sent to the PDCP sequence number of PDCP packet of the 2nd UE, and do not conflict mutually with the PDCP sequence number that a UE has successfully sent to the PDCP packet of the 2nd UE, thereby because abandoning the PDCP packet, the conflict of PDCP sequence number cause the problem of PDCP data-bag lost to lay the foundation for solving the 2nd UE.

In the present embodiment, the IP packet that the base station parses from the PDCP packet that a UE sends, perhaps gateway is handed down to the IP packet of base station, is actually the IP packet that a UE does not successfully send to the 2nd UE as yet.

The PDCP packet that step 410, base station will be packaged into again sends to the 2nd UE.

The PDCP packet that step 411, the 2nd UE send according to a UE who has successfully received receives the PDCP packet that the base station sends.

Concrete, the 2nd UE continues to receive the PDCP packet that the base station sends based on the PDCP packet that successfully receives UE transmission.For example, the 2nd UE can use same data buffer queue to store the PDCP packet of base station transmission and the PDCP packet that a UE sends.Be example with Fig. 4 C, the 2nd UE can be that 3,4,5,6 PDCP packet is put into frame of broken lines and three solid box above it successively with the PDCP sequence number that receives.Then, the 2nd UE carries out subsequent treatment according to each the PDCP packet shown in Fig. 4 C simultaneously.

In the present embodiment, the PDCP packet that the 2nd UE will correctly receive after the PDCP packet that first incorrect UE who receives sends returns to a UE, makes the UE that wins successfully begin to send the PDCP packet by the base station to the 2nd UE from first PDCP packet that does not send to the 2nd UE; The one UE sends to the base station with first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE, and the base station is begun from this PDCP sequence number is the IP allocation of packets PDCP sequence number that a UE does not send to the 2nd UE as yet, make the 2nd UE can correctly receive the PDCP packet that the base station sends, both finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, can not send with the PDCP packet that a UE who has successfully received sends again and conflict, guarantee in the communication pattern handoff procedure, not take place packet loss or reduced packet loss as far as possible.

The flow chart of the data processing method that Fig. 5 provides for another embodiment of the present invention.As shown in Figure 5, the method for present embodiment comprises:

Step 501, a UE directly send the PDCP packet to the 2nd UE.

This step 501 can be referring to the description of step 101.

Step 502, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE, and a UE receives the switching command that the base station sends.

This step 502 can be referring to the description of step 201 and step 102.

The PDCP packet that step 503, the 2nd UE will successfully receive after the PDCP packet that the current UE that first does not successfully receive sends sends to a UE, and the PDCP packet deletion that will successfully receive after the PDCP packet that first UE who does not successfully receive sends.

This step 503 can be referring to the description of step 403.

Step 504, the 2nd UE send to the base station with the PDCP sequence number of the PDCP packet that the current UE that first does not successfully receive sends.

In the present embodiment, the 2nd UE sends to the base station with the PDCP sequence number of the PDCP packet that first UE who does not successfully receive sends, so that the base station is the IP allocation of packets PDCP sequence number that gateway issues based on this PDCP sequence number.

Because first PDCP packet that does not successfully send to the 2nd UE of PDCP packet and a UE that first UE who does not successfully receive of the 2nd UE sends is identical, so both PDCP sequence numbers are also identical.

Therefore, other steps of present embodiment can be referring to the description of Fig. 4 A illustrated embodiment.

Wherein, the execution sequence of step 503 and step 504 is not done restriction yet.

Step 505, a UE successfully do not send to the PDCP packet of the 2nd UE from first, and first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station.

Step 506, base station receive the PDCP packet that a UE sends, and the PDCP packet that receives is carried out decapsulation obtain the IP packet.

Step 507, base station send to gateway with the IP packet according to a UE sends order from the PDCP packet to the base station.

Step 508, gateway are handled the IP packet that the base station sends, and again the IP packet are handed down to the base station then.

First PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE is encapsulated as the PDCP packet for the IP allocation of packets PDCP sequence number that gateway issues again with the IP packet that gateway is issued since a UE for step 509, base station.

The PDCP packet that step 510, base station will be packaged into again sends to the 2nd UE.

The PDCP packet that step 511, the 2nd UE send according to a UE who has successfully received receives the PDCP packet that the base station sends.

Present embodiment and Fig. 4 A illustrated embodiment are similar, has technique effect similarly, both finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, the PDCP packet that can not make the base station send to the 2nd UE again conflicts with the PDCP packet transmission that a UE who has successfully received sends, and has guaranteed not take place packet loss or reduced packet loss as far as possible in the communication pattern handoff procedure.

The flow chart of the data processing method that Fig. 6 provides for further embodiment of this invention.As shown in Figure 6, the method for present embodiment comprises:

Step 601, a UE directly send the PDCP packet to the 2nd UE.

This step 601 can be referring to the description of step 101.

Step 602, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE; The one UE receives the switching command that the base station sends.

This step 602 can be referring to the description of step 201 and step 102.

The PDCP packet that step 603, the 2nd UE will successfully receive after the PDCP packet that the current UE that first does not successfully receive sends sends to a UE, and the PDCP packet deletion that will successfully receive after the PDCP packet that first UE who does not successfully receive sends.

This step 603 can be referring to the description of step 403.

Step 604, a UE carry out PDCP and reset, and namely resetting, first does not successfully send to the PDCP packet and PDCP sequence number subsequent P DCP packet of the 2nd UE.

In the present embodiment, make an appointment when carrying out the pattern switching in the one UE and the 2nd UE and base station, the one UE does not successfully send to the PDCP packet of the 2nd UE from first, first does not successfully send to the PDCP packet of the 2nd UE and the PDCP sequence number of follow-up packet is reset with a UE, is these PDCP packets configurations PDCP sequence number again since 0 namely.

In this embodiment, the 2nd UE also carries out PDCP and resets, namely the 2nd UE can independently receive a UE as new PDCP packet by the PDCP packet that the base station sends, and therefore, also can not clash with the PDCP packet that a UE who has received sends.

Be depicted as example with Fig. 4 B and Fig. 4 C, a UE can be that the PDCP sequence number of 3,4,5,6 PDCP packet resets to 0,1,2,3 with former PDCP sequence number.When the 2nd UE receives the PDCP packet of base station transmission, the PDCP packet that the 2nd UE can independently receive and use other memory space storage to receive, the PDCP packet that other memory space storage base stations outside namely the 2nd UE can use shown in Fig. 4 C send.Then, the 2nd UE simultaneously carries out Business Processing based on the PDCP packet in the memory space outside shown in the PDCP packet in the memory space shown in Fig. 4 C and Fig. 4 C.

Step 605, a UE successfully do not send to the PDCP packet of the 2nd UE from first, and first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station.

Step 606, base station receive the PDCP packet that a UE sends, and the PDCP packet that receives is carried out decapsulation obtain the IP packet.

Step 607, base station send to gateway with the IP packet according to a UE sends order from the PDCP packet to the base station.

Step 608, gateway are handled the IP packet that the base station sends, and again the IP packet are handed down to the base station then.

This step 605-step 608 can be referring to the description of step 405-step 408.

Step 609, base station are encapsulated as the PDCP packet from the IP allocation of packets PDCP sequence number that PDCP sequence number 0 begins to issue for gateway again with the IP packet that gateway is issued.

The PDCP packet that step 610, base station will be packaged into again sends to the 2nd UE.

The PDCP packet that step 611, the 2nd UE send the base station is as new business datum, independently receives the PDCP packet that storage base station also sends.

In the present embodiment, owing to a UE resets to the follow-up PDCP sequence number of the PDCP packet of transmission that needs, so the 2nd UE can independently receive and store the PDCP packet that a UE sends by the base station as new business datum.

Though receive and storage on, the 2nd UE distinguishes the PDCP packet treating PDCP packet that a UE directly sends and send via the base station, when carrying out Business Processing, the 2nd UE can handle according to these two parts PDCP packet simultaneously.

In the present embodiment, the one UE by first successfully not being sent to the 2nd UE the PDCP packet and the PDCP sequence number of subsequent P DCP packet reset, make the 2nd UE the PDCP packet that the base station sends independently can be received and store as new business datum, both finished and a UE between communication pattern by the switching of D2D pattern to cell pattern, the PDCP packet that the UE that avoided again and successfully received sends conflicts mutually, has guaranteed in the communication pattern handoff procedure not packet loss or packet loss has been dropped to minimum.

The flow chart of the data processing method that Fig. 7 provides for further embodiment of this invention.As shown in Figure 7, the method for present embodiment comprises:

Step 701, a UE directly send the PDCP packet to the 2nd UE.

This step 701 can be referring to the description of step 101.

Step 702, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE; The one UE receives the switching command that the base station sends.

This step 702 can be referring to the description of step 201 and step 102.

Step 703, a UE successfully do not send to the PDCP packet of the 2nd UE from first, first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station, simultaneously first is not sent to the PDCP packet of the 2nd UE and follow-uply sent but the PDCP sequence number that successfully do not send to the PDCP packet of the 2nd UE sends to the base station together to the 2nd UE.In the present embodiment, subsequent P DCP packet comprises that first PDCP packet that does not successfully send to the 2nd UE of a UE does not successfully send to the PDCP packet of the 2nd UE afterwards.

Concrete, the one UE does not successfully send to the PDCP packet of the 2nd UE from first, first is not successfully sent to the PDCP packet of the 2nd UE and follow-uply sends to the 2nd UE but does not successfully send to the PDCP packet of the 2nd UE and the PDCP packet that never sent to the 2nd UE sends to the 2nd UE.That is to say, the described subsequent P DCP packet of present embodiment comprises a UE, and first does not successfully send to after the PDCP packet of the 2nd UE and to send to the 2nd UE but successfully do not send to the PDCP packet of the 2nd UE and never to the PDCP packet of the 2nd UE transmission, and does not comprise the PDCP packet that successfully sends to the 2nd UE.Therefore, in the present embodiment, the PDCP packet that successfully receives after the PDCP packet that the 2nd UE does not need to send at first UE who does not successfully receive returns to a UE, can alleviate the transmission burden of the 2nd UE like this.

Wherein, a UE sent to the 2nd UE after first does not successfully send to the PDCP packet of the 2nd UE but the PDCP packet that successfully do not send to the 2nd UE refers between PDCP sequence number maximum that first PDCP packet that does not successfully receive of the 2nd UE and the 2nd UE successfully receive (perhaps counting (COUNT) value maximum) the PDCP packet the not successful PDCP packet of reception of those the 2nd UE.

In the present embodiment, the one UE is when the PDCP packet that first is not successfully sent to the 2nd UE and subsequent P DCP packet send to the base station, first is not successfully sent to PDCP packet that those the 2nd UE between (perhaps COUNT value maximum) PDCP packet of the packet of PDCP of the 2nd UE and PDCP sequence number maximum that the 2nd UE successfully receives successfully do not receive send to the base station together with them at the PDCP of Ud link sequence number or sequence number and Hyper Frame Number, purpose be make the base station with first successfully do not send to the 2nd UE PDCP packet and follow-up to the 2nd UE sent but successfully do not send to the PDCP sequence number of PDCP packet of the 2nd UE or sequence number and Hyper Frame Number be encapsulated in a UE first successfully do not send to the 2nd UE PDCP packet and follow-up sent but successfully do not sent in the IP packet in the PDCP packet of the 2nd UE to the 2nd UE send to gateway, and receive the IP packet that comprises PDCP sequence number or sequence number and Hyper Frame Number that gateway issues, so that be the IP allocation of packets PDCP sequence number that gateway issues according to the PDCP sequence number that carries in the IP packet or sequence number and Hyper Frame Number.

Still be depicted as example with Fig. 4 B and Fig. 4 C, a UE can together send to the base station with PDCP sequence number 3 when the PDCP packet that with the PDCP sequence number is 3 sends to the base station.And be 4,5,6,7,8 etc. PDCP packet owing to be the PDCP packet that a UE successfully sends to the 2nd UE or never sent to the 2nd UE for follow-up PDCP sequence number, so do not need its PDCP sequence number is sent to the base station.

Further, which being distinguished for the ease of the base station is that a UE sent but the not successful PDCP packet that sends to the 2nd UE, which is the PDCP packet that a UE never sent to the 2nd UE, the one UE can be in the end one sent but successfully do not send in the PDCP packet of the 2nd UE to the 2nd UE and added indication information, no longer to carry the PDCP sequence number in the PDCP packet of informing the follow-up UE transmission that receives in base station, tell that just the base station PDCP packet that a follow-up UE who receives sends is the PDCP packet that a UE successfully sends to the packet of the 2nd UE or never sent to the 2nd UE.Be depicted as example with Fig. 4 B and Fig. 4 C, since have only the PDCP sequence number be 3 PDCP packet to be a UE sent to the 2nd UE but successfully do not send to the PDCP packet of the 2nd UE, so a UE can encapsulate indication information in the PDCP sequence number is 3 PDCP packet.

Step 704, base station receive the PDCP packet that a UE sends, and first does not successfully send to the sending to the 2nd UE but successfully do not send to PDCP sequence number or sequence number and the Hyper Frame Number of the PDCP packet of the 2nd UE with follow-up of PDCP packet of the 2nd UE to receive a UE that a UE sends.

In the present embodiment, first does not successfully send to the PDCP packet of the 2nd UE and follow-uply sent to the 2nd UE but successfully do not send to the PDCP packet of the 2nd UE for a UE, and the base station not only will receive PDCP sequence number or sequence number and the Hyper Frame Number that these PDCP packets also can receive these PDCP packets.

Step 705, the base station is carried out decapsulation to the PDCP packet that receives and is obtained the IP packet, first does not successfully send to the UE that the one UE is sent the PDCP packet of the 2nd UE and follow-uply sends but the PDCP sequence number that successfully do not send to the PDCP packet of the 2nd UE is encapsulated in a UE that first does not successfully send to the IP packet in the PDCP packet of the 2nd UE and follow-uply sent to the 2nd UE but successfully do not send in the IP packet in the PDCP packet of the 2nd UE to the 2nd UE, sends to gateway according to a UE to the order of base station transmission PDCP packet.

In the present embodiment, the base station sends to gateway then by first does not successfully send to the PDCP packet of the 2nd UE and follow-uply sent but the PDCP sequence number that successfully do not send to the PDCP packet of the 2nd UE (i.e. the 2nd UE successfully receive) is encapsulated in the IP packet that is taken on by these PDCP packet deblockings to the 2nd UE with a UE.For the PDCP packet that a UE never sent to the 2nd UE, the IP packet that the base station directly takes on deblocking sends to gateway according to a UE sends order from the PDCP packet to the base station.

Step 706, gateway are handled the IP packet that the base station sends, and again the IP packet are handed down to the base station then.

Wherein, no matter whether the IP packet carries PDPC sequence number or sequence number and Hyper Frame Number, and gateway can be handled the IP packet according to identical mode, and is handed down to the base station after processing finishes.Wherein, if the IP packet itself carries PDCP sequence number or sequence number and Hyper Frame Number, then the gateway IP packet that sends to the base station just carries PDCP sequence number or sequence number and Hyper Frame Number, if IP packet itself does not carry PDCP sequence number or sequence number and Hyper Frame Number, then the gateway IP packet that sends to the base station does not just carry the PDCP sequence number.

The entrained PDCP sequence number of the IP packet that carries PDCP sequence number or sequence number and Hyper Frame Number that step 707, base station issue according to gateway, each IP allocation of packets PDCP sequence number for gateway issues is encapsulated as the PDCP packet again with the IP packet that gateway is issued.

For example, entrained this IP packet of PDCP serial number assignment of IP packet of PDCP sequence number will be carried in the base station, and continue as the IP allocation of packets PDCP sequence number that other do not carry the PDCP sequence number according to the order of this distribution PDCP sequence number.

The PDCP packet that step 708, base station will be packaged into again sends to the 2nd UE.

The PDCP packet that step 709, the 2nd UE send according to a UE who has successfully received receives the PDCP packet that the base station sends.

In the present embodiment, the one UE by first successfully not being sent to the 2nd UE the PDCP packet and follow-uply sent but the PDCP sequence number of the PDCP packet that the 2nd UE does not successfully receive offers the base station to the 2nd UE, make the base station that these PDCP sequence numbers are encapsulated in the corresponding IP packet, and after gateway issues the IP packet, be that the IP packet that gateway issues carries out the distribution of PDCP sequence number according to the entrained PDCP sequence number of IP packet that carries the PDCP sequence number, make that distribution PDCP sequence number is evidence-based, the PDCP sequence number of having avoided successfully having sent to the PDCP packet of the 2nd UE with a UE clashes, both realized the switching of communication pattern, and guaranteed in the communication pattern handoff procedure not packet loss again or packet loss has been dropped to minimum.

The flow chart of the data processing method that Fig. 8 provides for further embodiment of this invention.As shown in Figure 8, the method for present embodiment comprises:

Step 801, a UE directly send the PDCP packet to the 2nd UE.

This step 801 can be referring to the description of step 101.

Step 802, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE; The one UE receives the switching command that the base station sends.

This step 802 can be referring to the description of step 201 and step 102.

Step 803, the 2nd UE will send to a UE by the successful PDCP packet that receives after the PDCP packet that the current UE that first does not successfully receive sends, and the PDCP packet deletion that will successfully receive after PDCP packet that first UE who successfully receives sends.

This step 803 can be referring to the description of step 403.

Step 804, a UE successfully do not send to the PDCP packet of the 2nd UE from first, and first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station.

This step 804 can be referring to the description of step 405.

Step 805, base station receive the PDCP packet that a UE sends, and record the PDCP sequence number that a UE sends to first PDCP packet of base station.

Because a UE is the PDCP packet that does not successfully send to the 2nd UE from first, send the PDCP packet according to the order of sequence to the base station, therefore, a UE send to the base station first PDCP packet just a UE first successfully do not send to the PDCP packet of the 2nd UE.

In the present embodiment, decapsulation is carried out by first PDCP packet that a UE is sent to the base station in the base station, obtains the PDCP sequence number of this first PDCP packet, and need not a UE or the 2nd UE send to the base station, be conducive to reduce interaction flow.

Step 806, base station are carried out decapsulation to the PDCP packet that receives and are obtained the IP packet, and the IP packet is sent to gateway according to a UE sends order from the PDCP packet to the base station.

Step 807, gateway are handled the IP packet that the base station sends, and again the IP packet are handed down to the base station then.

First PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE is encapsulated as the PDCP packet for the IP allocation of packets PDCP sequence number that gateway issues again with the IP packet that gateway is issued since a UE for step 808, base station.

Wherein, first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE of a UE is the PDCP sequence number that a UE sends to first PDCP packet of base station.

The PDCP packet that step 809, base station will be packaged into again sends to the 2nd UE.

The PDCP packet that step 810, the 2nd UE send according to a UE who has successfully received receives the PDCP packet that the base station sends.

Present embodiment and Fig. 4 A illustrated embodiment are similar, and difference is, the base station obtains a UE, and first does not successfully send to the operation difference of PDCP sequence number of the PDCP packet of the 2nd UE, and other steps can be referring to the description of Fig. 4 A illustrated embodiment.

Present embodiment had equally both been finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, the PDCP packet that can not make the base station send to the 2nd UE again conflicts with the PDCP packet transmission that a UE who has successfully received sends, and has guaranteed not take place packet loss or reduced packet loss as far as possible in the communication pattern handoff procedure.

The flow chart of the data processing method that Fig. 9 provides for further embodiment of this invention.As shown in Figure 9, the method for present embodiment comprises:

Step 901, a UE directly send the PDCP packet to the 2nd UE.

Step 902, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE; The one UE receives the switching command that the base station sends.

Step 903, a UE successfully do not send to the PDCP packet of the 2nd UE from first, and first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station.

In the present embodiment, described subsequent P DCP packet comprises a UE first does not successfully send to after the PDCP packet of the 2nd UE to the 2nd UE and sent but the PDCP packet that successfully do not send to the PDCP packet of the 2nd UE and never sent to the 2nd UE.

Step 904, base station receive the PDCP packet that a UE sends, the PDCP packet that receives is carried out decapsulation obtain the IP packet, the corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number that records the PDCP packet that a UE sends simultaneously and the PDCP packet of UE transmission.

In the present embodiment, the base station receives after the PDCP packet of UE transmission, the PDCP packet is carried out decapsulation obtain the IP packet, record the corresponding relation between the IP sequence number of the PDCP sequence number of this PDCP packet and the IP packet that decapsulation goes out simultaneously so that follow-up be the IP allocation of packets PDCP sequence number that gateway issues based on this corresponding relation.

Still sending the PDCP sequence number with a UE to the base station is 3,4,5,6, wherein the IP sequence number of IP packet is followed successively by 6,7,8,9 for example, then the corresponding relation between PDCP sequence number 3 and the IP sequence number 6 can be recorded in the base station, corresponding relation between PDCP sequence number 4 and the IP sequence number 7, corresponding relation between PDCP sequence number 5 and the IP sequence number 8, the corresponding relation between PDCP sequence number 6 and the IP sequence number 9.

Step 905, base station send to gateway with the IP packet according to a UE sends order from the PDCP packet to the base station.

Step 906, gateway are handled the IP packet that the base station sends, and again the IP packet are handed down to the base station then.

Step 907, base station are the PDCP sequence number of the IP allocation of packets correspondence that issues of gateway according to the corresponding relation of record, are encapsulated as the PDCP packet again with the IP packet that gateway is issued.

For example, the base station is found the PDCP sequence number corresponding with identical IP sequence number according to the IP sequence number of the IP packet that gateway issues in the corresponding relation of record, the PDCP sequence number that finds for this IP allocation of packets then, base station and a UE are that the PDCP sequence number of same IP allocation of packets is identical like this.Illustrate, the base station can be that 6,7,8,9 IP packet distributes PDCP sequence number 3,4,5,6 respectively for the IP sequence number.

The PDCP packet that step 908, base station will be packaged into again sends to the 2nd UE.

The PDCP packet that step 909, the 2nd UE send according to a UE who has successfully received receives the PDCP packet that the base station sends.

In the present embodiment, corresponding relation between the PDCP sequence number of the PDCP packet that the base station sends by record the one UE and the IP sequence number of the IP packet in each PDCP packet, be the IP allocation of packets PDCP sequence number that gateway issues based on the corresponding relation that records then, make that the PDCP sequence number when each the IP packet that issues for gateway distributes the PDCP sequence number to send with a UE is consistent, thereby the PDCP sequence number of avoiding successfully having sent to the PDCP packet of the 2nd UE with a UE before clashes, both finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, the PDCP packet that can not make the base station send to the 2nd UE again conflicts with the PDCP packet transmission that a UE who has successfully received sends, and has guaranteed not take place packet loss or reduced packet loss as far as possible in the communication pattern handoff procedure.

The flow chart of the data processing method that Figure 10 provides for further embodiment of this invention.As shown in figure 10, the method for present embodiment comprises:

Step 1001, a UE directly send the PDCP packet to the 2nd UE.

Step 1002, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE; The one UE receives the switching command that the base station sends.

Step 1003, the 2nd UE will send to a UE by the successful PDCP packet that receives after the PDCP packet that the current UE that first does not successfully receive sends, and the PDCP packet deletion that will successfully receive after PDCP packet that first UE who successfully receives sends.

Step 1004, a UE or the 2nd UE send to the base station with the PDCP sequence number that first does not successfully send to the PDCP packet of the 2nd UE.

Step 1005, a UE successfully do not send to the PDCP packet of the 2nd UE from first, and first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is sent to the base station.

Step 1006, base station receive the PDCP packet that a UE sends, and the PDCP packet that receives is carried out decapsulation obtain the IP packet.

Step 1007, base station send to gateway with the IP packet according to a UE sends order from the PDCP packet to the base station.

Step 1008, gateway are handled the IP packet that the base station sends, and the order according to the IP packet that receives the base station transmission is handed down to the base station with the IP packet again then.

In the present embodiment, what gateway reception base station sent sends to the IP packet of the 2nd UE by a UE, and records the order that receives the IP packet.Wherein, the described IP packet PDCP packet that to be the base station send a UE carries out decapsulation and obtains, and includes the sign of a UE and the sign of the 2nd UE in the IP packet.Then, gateway is handled the IP packet that receives, and issues IP packet after the processing to the base station according to the order of record.

Wherein, gateway can be known the sign of a UE and the sign of the 2nd UE in advance.Concrete, the base station can send the sign of a UE and the sign of the 2nd UE to gateway in advance, the sign of the UE that gateway reception base station sends and the sign of the 2nd UE.Based on this, what gateway received that the base station sends sends to the IP packet of the 2nd UE by a UE, and the order of record reception IP packet comprises: gateway is according to the sign of a UE of knowing in advance and the sign of the 2nd UE, in the IP packet that the base station sends, identify the IP packet that is sent to the 2nd UE by a UE, and record receives the order that these UE send to the IP packet of the 2nd UE.After processing finished, gateway issued these treated IP packets according to the order of these IP packets of reception of record to the base station.The base station is identical to the order of gateway transmission IP packet with gateway sends order from the IP packet to the base station like this.

Wherein, a UE and sign the 2nd UE can be a UE and IP address the 2nd UE, but are not limited thereto.

Step 1009, base station receive the IP packet that gateway issues according to the order that receives the IP packet that the base station sends.

First PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE is encapsulated as the PDCP packet for the IP allocation of packets PDCP sequence number that gateway issues again with the IP packet that gateway is issued since a UE for step 1010, base station.

Because it is identical that the order of the IP packet that issues of gateway and base station send to the order of IP packet of gateway, and the base station IP allocation of packets PDCP sequence number that first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE issues for gateway since a UE, the PDCP packet that is packaged into so again is identical with the PDCP packet that a UE sends to the base station.Described here identically comprise that the PDCP sequence number of corresponding PDCP packet is identical, and the IP packet that encapsulates in the corresponding PDCP packet is also identical.

The PDCP packet that step 1011, base station will be packaged into again sends to the 2nd UE.

In the present embodiment, the base station sends the PDCP packet according to a UE sends order from the PDCP packet to the 2nd UE to the 2nd UE, and to send to the PDCP packet of the 2nd UE identical with the PDCP packet that a UE directly sends to the 2nd UE in the base station.

The PDCP packet that step 1012, the 2nd UE send according to a UE who has successfully received receives the PDCP packet that the base station sends.

In the present embodiment, by gateway being carried out the function expansion, gateway identify the IP packet between a UE and the 2nd UE and record a UE and the 2nd UE between the reception order of IP packet, issue the IP packet to the base station according to the reception order then, make that the result of the base station IP allocation of packets PDCP sequence number that first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE issues for gateway since a UE is identical with the PDCP packet that a UE reports, make the 2nd UE directly to send the PDCP packet to it as a UE and continue to receive the PDCP packet, equally both finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, the PDCP packet that can not make the base station send to the 2nd UE again conflicts with the PDCP packet transmission that a UE who has successfully received sends, and has guaranteed not take place packet loss or reduced packet loss as far as possible in the communication pattern handoff procedure.

The flow chart of the data transmission method for uplink that Figure 11 provides for further embodiment of this invention.As shown in figure 11, the method for present embodiment comprises:

Step 1101, a UE directly send packet to the 2nd UE.

What this step 1101 was described is that a UE and the 2nd UE adopt the D2D pattern to communicate.

After Ud carrying foundation was finished, a UE encapsulated the generation packet with the IP packet in the communication service, directly the packet that is packaged into is sent to the 2nd UE then.

What step 1102, a UE received that the base station sends switches to the switching command of cell pattern by the D2D pattern.

In the present embodiment, the base station manages the communication process between a UE and the 2nd UE.When needs communicated the switching of pattern, the base station can send switching command to a UE.In the present embodiment, described switching command is used for making the communication pattern of a UE and the 2nd UE switch to cell pattern by the D2D pattern.

Illustrate, if a UE and the 2nd UE are mobile mutually, distance each other is more and more far away, communicates and will cause serious data to lose or can't re-use the D2D pattern and communicate the time, switching command can be sent to a UE in the base station as far as re-using the D2D pattern.

Step 1103, a UE successfully do not send to the packet of the 2nd UE from first, first is not successfully sent to the packet of the 2nd UE and follow-up packet sends to the base station, so that the base station directly is transmitted to the 2nd UE with the packet that a UE sends.

Wherein, first does not successfully send to the packet of packet first UE transmission that does not successfully receive of the 2nd UE just of the 2nd UE.Wherein, the packet that first UE who does not successfully receive of the 2nd UE sends comprises that the 2nd UE receives but the packet that makes a mistake also comprises the packet that the 2nd UE does not receive.Wherein, a UE and the 2nd UE all can know a UE first successfully not send to the packet of the 2nd UE, or the packet that sends of first UE who does not successfully receive of the 2nd UE.Particularly, the 2nd UE can be when receiving the pattern switching command, and the accepting state of packet is fed back to a UE.

After a UE received switching command, a UE and the 2nd UE all can set up the Uu carrying with the base station.Wherein, Uu carrying is that data transmit-receive is carried out and the carrying of setting up in a UE or the 2nd UE and base station.Wherein, a UE and the 2nd UE belong to prior art with the process that Uu carrying is set up in the base station respectively, are not described in detail in this.

Then, a UE does not successfully send to the packet of the 2nd UE from first, sends packet by the base station to the 2nd UE.Then, the base station directly is transmitted to the 2nd UE with the packet that a UE sends.

Present embodiment and Fig. 1-difference embodiment illustrated in fig. 10 is, the base station no longer reports gateway with packet but directly is transmitted to the 2nd UE in the present embodiment, that is to say that the base station of present embodiment has the partial function of gateway simultaneously, for example can add up and function such as report gateway the communication flows between a UE and the 2nd UE.

Because the base station no longer reports gateway with the packet that receives, so the packet of present embodiment can be Radio Link control (Radio Link Contro, RLC) service data unit (service Data Unit, SDU) or medium access control (Media Access Control, MAC) SDU or Medium Access Control (MAC) Protocol Data Unit (Protocol Data Unit, PDU), be not limited only to the PDCP packet.

Further, because the base station no longer reports gateway with the packet that a UE sends, do not need the packet that a UE sends is decrypted, but directly be transmitted to the 2nd UE, therefore, the packet that the one UE sends to the base station can use the key of making an appointment between a UE and the 2nd UE, also can be described as the key on the Ud link that uses between a UE and the 2nd UE.For example, when a UE sends packet by the base station to the 2nd UE, the one UE can use the key of making an appointment with the 2nd UE that first is not successfully sent to the packet of the 2nd UE and follow-up packet is encrypted, such UE or the 2nd UE just do not need and the base station between consult new key, it is mutual to be conducive to saving signaling.

The flow chart of the data transmission method for uplink that Figure 12 provides for further embodiment of this invention.As shown in figure 12, the method for present embodiment comprises:

Step 1201, base station send the switching command that is switched to cell pattern by the D2D pattern to a UE, switch to by the base station to the 2nd UE transmission data from sending data with the D2D pattern to the 2nd UE to indicate a UE.

Before this, a UE directly sends packet to the 2nd UE with the D2D pattern.The communication process between a UE and the 2nd UE is detected in the base station.Finding a UE and the 2nd UE when the base station need communicate by the base station, when namely needing to use cell pattern, sends switching command to a UE.

In the present embodiment, described switching command is used for making a UE to switch to by the base station to the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE.

Step 1202, base station receive a UE that a UE sends, and first does not successfully send to the packet of the 2nd UE and follow-up packet.

Concrete, after a UE received the switching command of base station transmission, a UE began to send packet by the base station to the 2nd UE from first packet that does not successfully send to the 2nd UE.Wherein, first packet that does not successfully send to the 2nd UE of UE packet of sending of first UE who does not successfully receive of the 2nd UE just.Wherein, the packet that first UE of successfully receiving of the 2nd UE sends comprises that the 2nd UE receives but the packet that makes a mistake also comprises the packet that the 2nd UE does not receive.The one UE and the 2nd UE all can be known a UE, and first does not successfully send to the packet of the 2nd UE or the packet that first UE who does not successfully receive of the 2nd UE sends.

Before a UE sent packet to the base station, a UE and the 2nd UE set up the Uu carrying with the base station respectively.Then a UE sends packet by the carrying of the Uu between itself and the base station to the base station.The process of setting up of Uu carrying belongs to prior art, is not described in detail in this.

Step 1203, base station directly are transmitted to the 2nd UE with the packet that a UE sends.

The base station of present embodiment has following expanded function: the function of the carrying that a UE and the 2nd UE be associated is shone upon and held back in the carrying of a UE with the carrying of the 2nd UE, can directly the function of opposite end be held back and directly be transmitted to the packet between a UE and the 2nd UE exactly in simple terms; The function that flow between the one UE and the 2nd UE is chargeed, the perhaps function that the flow between a UE and the 2nd UE is reported.

Based on this, the base station of present embodiment after receiving the packet that a UE sends, report gateway but directly be transmitted to the 2nd UE no longer.Exactly because the base station does not need the packet that a UE sends is reported gateway yet, makes that the packet of present embodiment can be RLC SDU or MAC SDU or MAC PDU, and is not limited only to the PDCP packet.Exactly because the base station does not need the packet that a UE sends is reported gateway yet, the base station does not need the packet that a UE sends is decrypted, so the packet that a UE sends can use and the 2nd UE between the key of making an appointment be encrypted, improve the fail safe of packet.

Further, the packet that the base station can also send a UE be reduced to the IP packet, and adds up flow between a UE and the 2nd UE according to the IP packet that restores, so that carry out charge on traffic.For example, the base station can report gateway with the flow that counts, by gateway to the processing of chargeing of this flow.Again for example, the charging processing capacity of gateway can also be expanded in the base station, and the base station is directly to the processing of chargeing of the flow between a UE and the 2nd UE.

In the present embodiment, by the base station being carried out the function expansion, make the base station have gateway simultaneously and carry out traffic statistics, functions such as charging, make that the base station can be with the packet report gateway that receives and directly be transmitted to the 2nd UE, do not need to be again IP allocation of packets PDCP sequence number, both finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, the PDCP packet that can not make the base station send to the 2nd UE again conflicts with the PDCP packet transmission that a UE who has successfully received sends, and has guaranteed not take place packet loss or reduced packet loss as far as possible in the communication pattern handoff procedure.

How above-mentioned Fig. 1-embodiment illustrated in fig. 12 introduction switches to cell pattern with the communication pattern between a UE and the 2nd UE by the D2D pattern, below embodiment will introduce how the communication pattern between a UE and the 2nd UE is switched to the D2D pattern by cell pattern.

The flow chart of the data transmission method for uplink that Figure 13 provides for further embodiment of this invention.As shown in figure 13, the method for present embodiment comprises:

Step 1301, a UE send the PDCP packet to the base station.

What this step 1301 was described is the process that a UE and the 2nd UE use cell pattern to communicate.

Concrete, set up the Uu carrying between a UE and the base station in advance, a UE by and the base station between the Uu link PDCP packet is sent to the base station.

What step 1302, a UE received that the base station sends switches to the switching command of D2D pattern by cell pattern.

In the present embodiment, the base station manages the communication process between a UE and the 2nd UE.When the base station detects can use the D2D pattern to communicate between a UE and the 2nd UE time, can send switching command to a UE and/or the 2nd UE.In the present embodiment, described switching command is used for making a UE to switch to the D2D pattern to the 2nd UE transmission PDCP packet from sending the PDCP packet with cell pattern to the 2nd UE.For example when the base station detects distance between a UE and the 2nd UE and satisfies certain condition, when perhaps the signal strength signal intensity between a UE and the 2nd UE satisfies certain condition, send switching command to a UE and/or the 2nd UE.

Step 1303, a UE will send to the 2nd UE with the D2D pattern at first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE under the cell pattern.

Receive the switching command of base station transmission as a UE after, from first does not successfully send to the PDCP packet of the 2nd UE under cell pattern, first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE is directly sent to the 2nd UE with the D2D pattern.

In the present embodiment, use cell pattern to communicate in the process at a UE and the 2nd UE, the base station sends switching command to a UE, the one UE switches to cell pattern from sending the PDCP packet with cell pattern to the 2nd UE, namely send the PDCP packet by the base station to the 2nd UE, make the communication pattern of win UE and the 2nd UE switch to the D2D pattern by cell pattern.

The flow chart of the data transmission method for uplink that Figure 14 provides for further embodiment of this invention.As shown in figure 14, the method for present embodiment comprises:

Step 1401, base station receive the PDCP packet that a UE sends, and the PDCP packet that a UE is sent sends to gateway and receives the IP packet that PDCP packet that gateway sends according to the base station issues.

Step 1402, base station are the IP allocation of packets PDCP sequence number that gateway issues, and are packaged into the PDCP packet again with the IP packet that gateway is issued.

The PDCP packet that step 1403, base station will be packaged into again sends to the 2nd UE.

Step 1404, base station send the switching command that is switched to the D2D pattern by cell pattern to a UE, will send to the 2nd UE with the D2D pattern to indicate a UE at first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE under the cell pattern according to switching command.

In the present embodiment, the base station manages the communication process between a UE and the 2nd UE.Send in the PDCP process data packet to the 2nd UE with cell pattern at a UE, whether the base station can be detected the distance between a UE and the 2nd UE, signal strength signal intensity etc., can communicate with the D2D pattern to detect between a UE and the 2nd UE.When the base station detects can communicate with the D2D pattern between a UE and the 2nd UE time, send switching command to a UE and/or the 2nd UE.

After the one UE receives switching command, from first does not successfully send to the PDCP packet of the 2nd UE under cell pattern, send the PDCP packet with the D2D pattern to the 2nd UE.

The flow chart of the data receive method that Figure 15 provides for further embodiment of this invention.As shown in figure 15, the method for present embodiment comprises:

Step 1501, the 2nd UE receive the PDCP packet that the base station sends.

Wherein, the PDCP packet that the base station sends is that the base station receives the PDCP packet that a UE sends, and the PDCP packet that a UE is sent sends to gateway and is that PDCP packet step 1502, the 2nd UE that the IP packet that issues is packaged into again receives the PDCP packet that a UE directly sends with the PDCP packet that gateway sends according to the base station.

Wherein, the UE switching command that switches to the D2D pattern by cell pattern that directly to send to the PDCP packet of the 2nd UE be a UE sends according to the base station begins to send from the PDCP packet that first does not successfully send to the 2nd UE.

In the above-described embodiments, after guaranteeing to switch to the D2D pattern from cell pattern, the 2nd UE not factor causes packet loss according to conflict, in cell pattern, the corresponding relation between the sequence number that a UE sends to the IP packet that the PDCP packet of base station and PDCP packet that the base station sends to the 2nd UE and each PDCP packet comprise is recorded in the base station.Following embodiment will be to being described further by the switching flow of cell pattern to the D2D pattern.

In above-mentioned Figure 13-embodiment illustrated in fig. 15, that PDCP sequence number that the PDCP packet that the base station can directly use a UE to send uses is as the PDCP sequence number of the PDCP packet that is packaged into again.That is to say, under cell pattern, when the PDCP packet that a UE sends is received in the base station, record the mapping relations between the IP sequence number of the PDCP sequence number of this PDCP packet and the IP packet in this PDCP packet.Then, when the base station receives the IP packet of identical IP sequence number from gateway, when being this IP allocation of packets PDCP sequence number, not autonomous distribution, but the PDCP sequence number corresponding to the IP sequence number of this IP packet that once used according to a UE of record.Then, send to the 2nd UE after the PDCP sequence number that once used with this UE is packaged into the PDCP packet again with the IP packet.Like this, under this scheme, the corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number of the IP sequence number of the IP packet in the PDCP packet that the PDCP sequence number of the PDCP packet that the UE that records the base station sends, a UE send, the PDCP packet that is packaged into again and the PDCP packet that is packaged into again is exactly the corresponding relation between the IP sequence number of the PDCP sequence number of PDCP packet and the IP packet in the PDCP packet in simple terms.

In this scheme, when taking place cell pattern to the switching of D2D pattern, if the base station will return the PDCP packet of the not transmission success of correspondence to a UE, so that a UE is when continuing to give the 2nd UE with the D2D mode transfer, for the IP packet of identical IP sequence number, a UE uses same PDCP sequence number just passable.

In above-mentioned Figure 13-embodiment illustrated in fig. 15, the IP allocation of packets PDCP sequence number that the base station can also independently issue for gateway, be which type of PDCP sequence number the base station uses send the PDCP packet to the 2nd UE, be not subjected to the restriction of the PDCP sequence number of UE use.That is to say that when the base station sent the PDCP packet to the 2nd UE, the PDCP sequence number of usefulness was to be totally independent of PDCP sequence number that a UE uses.Like this, in the corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number of the IP sequence number of the IP packet in the PDCP sequence number of the PDCP packet that a UE of base station record sends, PDCP packet that a UE sends, the PDCP packet that is packaged into again and the PDCP packet that is packaged into again, the PDCP sequence number that use the PDCP sequence number that the IP sequence number by the IP packet uses a UE of same IP packet correspondence and base station is mapped.

In this scheme, because for same IP packet, be separate between the PDCP sequence number that uses when the 2nd UE is mail in the PDCP sequence number that the one UE uses when mailing to the base station and base station, so, when switching from cell pattern to the D2D pattern, when a UE continues to use the D2D pattern to send the PDCP packet to the 2nd UE, need the PDCP sequence number of a UE or the PDCP packet of the 2nd UE to make a little changes, so that the 2nd UE successfully receives the PDCP packet.

The PDCP sequence number is made change if a UE is, so when switching to the D2D pattern from cell pattern, the mode of the PDCP sequence number that used when the 2nd UE sends the PDCP packet base station before the one UE can use continues to send the PDCP packet with the D2D pattern to the 2nd UE.For example, successfully be not transferred to the PDCP packet of the 2nd UE for the base station, the base station is when returning to a UE, can tell a UE which type of PDCP sequence number is these PDCP packets needs use, be that the base station is when returning the PDCP packet to a UE, the PDCP sequence number (being that the base station is the PDCP sequence number that these PDCP packets use) of these PDCP packets is sent to a UE, so that the PDCP sequence number that a UE uses the base station to use sends these PDCP packets and subsequent P DCP packet.For a UE, the one UE receives the PDCP packet that the base station is returned, receive the PDCP sequence number of these PDCP packets of base station transmission simultaneously, and the PDCP sequence number of the PDCP packet that returns according to the base station, upgrade the PDCP sequence number of first PDCP packet that does not successfully send to the 2nd UE and subsequent P DCP packet, the PDCP packet after will upgrading then sends to the 2nd UE with the D2D pattern.Again for example, the base station can tell a UE which type of PDCP sequence number is first PDCP packets need that does not successfully send to the 2nd UE use, so that the PDCP sequence number that a UE can use the base station to use continues to send the PDCP packet with the D2D pattern to the 2nd UE.Namely a UE does not successfully send to the PDCP sequence number of the PDCP packet of the 2nd UE from first, be first PDCP packet and subsequent P DCP allocation of packets PDCP sequence number that does not successfully send to the 2nd UE, the PDCP packet and the subsequent P DCP packet that then first are not successfully sent to the 2nd UE send to the 2nd UE with the D2D pattern.

The PDCP sequence number is made change if the 2nd UE is, so when switching to the D2D pattern from cell pattern, a UE when sending the PDCP packet to the 2nd UE, the PDCP sequence number that uses in the time of can using a UE to send these PDCP packets to the base station.Because the PDCP packet of those discontinuous correct receptions of putting in the buffering of the 2nd UE is to receive according to the PDCP sequence number that use base station before, can correctly receive the PDCP packet that UE continuation sends with the D2D pattern for the ease of the 2nd UE, the base station need tell the PDCP sequence number of the PDCP packet in the buffer memory of the 2nd UE to make amendment, and sends the employed PDCP sequence number of these PDCP packets originally to be modified as a UE.For example, the base station can send to the 2nd UE with the corresponding relation of record, the PDCP sequence number of the PDCP packet that the base station that receives with the corresponding relation renewal success of notifying the 2nd UE to send according to the base station sends.Concerning the 2nd UE, receive the corresponding relation that the base station sends, and to upgrade the PDCP sequence number be connected into the PDCP packet that base station that merit receives sends according to corresponding relation be the PDCP sequence number that a UE uses when sending, and clashes with the PDCP sequence number of the PDCP packet avoiding sending with the D2D pattern with a UE.

The flow chart of the data processing method that Figure 16 provides for further embodiment of this invention.As shown in figure 16, the method for present embodiment comprises:

Step 1601, a UE send the PDCP packet to the base station.

Step 1602, base station receive the PDCP packet that a UE sends, and the PDCP packet that a UE is sent sends to gateway and receives the IP packet that PDCP packet that gateway sends according to the base station issues.

Step 1603, base station are the IP allocation of packets PDCP sequence number that gateway issues, again be packaged into the PDCP packet with the IP packet that gateway is issued, and record the PDCP sequence number of the IP sequence number of PDCP sequence number, the IP packet in the PDCP packet that a UE sends of the PDCP packet that a UE sends, the PDCP packet that is packaged into again and the PDCP packet that is packaged into again in the IP sequence number of IP packet between corresponding relation.

Comparatively preferred, the IP sequence number of the IP packet that the base station issues according to gateway, obtain the PDCP packet of the IP packet correspondence that has this IP sequence number, IP packet with the PDCP serial number assignment of the PDCP packet that obtains issues to gateway is packaged into the PDCP packet again with the IP packet that gateway is issued.But in the present embodiment, independently be that the IP allocation of packets PDCP sequence number that gateway issues is example with the base station, namely the base station is that the PDCP sequence number of the IP allocation of packets that issues of gateway and PDCP sequence number that a UE uses are separate.

Further, the D2D ability information that the base station can be in advance reports according to a UE and the 2nd UE judges whether a UE and the 2nd UE support the D2D pattern simultaneously.If judged result is for being, the operation of the corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number of the IP sequence number of the IP packet in the PDCP sequence number of the PDCP packet that base station ability executive logging the one UE sends, the PDCP packet that a UE sends, the PDCP packet that is packaged into again and the PDCP packet that is packaged into again is so that lay the first stone for switching to the D2D pattern.If one of them does not support the D2D pattern at least for a UE and the 2nd UE, then just can not use the D2D pattern to communicate between a UE and the 2nd UE, therefore, the base station need not the operation of executive logging corresponding relation, be conducive to save the resource of base station, alleviate the burden of base station.

Wherein, the corresponding relation that records of the base station IP allocation of packets PDCP sequence number that is used to gateway to issue by the base station.

The PDCP packet that step 1604, base station will be packaged into again sends to the 2nd UE.

Step 1605, base station send the switching command that is switched to the D2D pattern by cell pattern to a UE, and a UE receives this switching command.

Step 1606, base station send to a UE with the PDCP sequence number that first does not successfully send to the PDCP packet of the 2nd UE.

In the present embodiment, first PDCP packet that does not successfully send to the 2nd UE of base station just a UE first successfully do not send to the PDCP packet of the 2nd UE.In the present embodiment, because the corresponding relation between the PDCP sequence number that a UE of same IP packet correspondence and base station uses has been recorded in the base station, first does not successfully send to the PDCP sequence number of the PDCP packet of the 2nd UE so the base station can be found according to the corresponding relation of record in the base station.

Further, the PDCP packet can also be returned to a UE in the base station.Accordingly, a UE can receive the PDCP packet that returns the base station.

Wherein, the PDCP packet that returns of base station can be the PDCP packet that the base station does not send to gateway as yet.That is to say that the base station returns to a UE with the PDCP packet that does not send to gateway as yet that a UE sends.

In addition, the PDCP packet that returns of base station also can be that reduce to all or part of PDCP packet that is packaged into and does not successfully send to as yet the 2nd UE again and the PDCP packet that generates the base station.That is to say, the base station can be reduced all or part of PDCP packet that is packaged into and does not successfully send to as yet the 2nd UE again according to the corresponding relation of record, mainly refer to be reduced to the PDCP packet that a UE sends, then the PDCP packet that restores is returned to a UE.The PDCP sequence number of the packet when the PDCP sequence number of the packet of described reduction sends this packet with a UE to the base station is identical.

Further, if the base station does not return to a UE with the PDCP packet that restores or the PDCP packet that only partial reduction is gone out, then the PDCP packet that restores of the base station PDCP packet that Restore All need be gone out or remainder continues to send to the 2nd UE, to guarantee not take place packet loss.

Further, when the base station all finishes the PDCP packet that does not send and need send to the 2nd UE as yet to the 2nd UE transmission after, send a notification message to a UE, finish to inform that a UE has sent the PDCP packet that does not send and need send to the 2nd UE as yet to the 2nd UE.The one UE receives the notification message that the base station sends, and sends to the 2nd UE according to the PDCP packet that notification message knows that the base station will not send as yet and needs send to the 2nd UE and to finish.Wherein, the described PDCP packet that does not send and need send to the 2nd UE as yet refers to that the base station sends after the switching command, definite various PDCP packets that continued to send to the 2nd UE by the base station, for example, can be all or part of PDCP packet that the base station restores the PDCP packet that is packaged into and does not send to as yet the 2nd UE again according to the corresponding relation that records.If the PDCP packet that the base station need go out Restore All sends to the 2nd UE, the PDCP packet that does not then send and need send to the 2nd UE as yet is exactly the PDCP packet that Restore All goes out.If the PDCP packet that the base station need go out partial reduction sends to the 2nd UE, and the PDCP packet that another part restores is returned to a UE, the PDCP packet that does not then send and need send to the 2nd UE as yet refers to the PDCP packet that partial reduction goes out.In addition, if the base station is determined after sending switching command, need will to receive and not report as yet the PDCP packet of gateway and/or to have become the PDCP packet that is packaged into again to send to the 2nd UE, the PDCP packet that does not then send and need send to the 2nd UE as yet can also be that the base station has received but do not report the PDCP packet of gateway and/or the PDCP packet that has been packaged into again as yet.Wherein, the base station can send a notification message to a UE behind the status report that finishes receiving the PDCP packet that receives the 2nd UE transmission.In addition, the base station also can send the notification message that passback finishes to a UE after PDCP packet to a UE all returns to a UE will needing to return.Further, notification message can be dedicated signaling, also can be special end indication.

In this explanation, first PDCP packet that does not successfully send to the 2nd UE is to be determined according to the PDCP sequence number of PDCP packet by the 2nd UE, i.e. the PDCP packet of the PDCP sequence number minimum that does not successfully receive.For example, if the PDCP packet that the base station is returned is PDCP packet the earliest, then the PDCP packet that returns of base station be exactly base station or a UE first successfully do not send to the PDCP packet of the 2nd UE.Again for example, if a UE sends to the PDCP packet of base station and all successfully sent to the 2nd UE by the base station, then first PDCP packet that does not successfully send to the 2nd UE of a UE is exactly the most forward PDCP packet that a UE does not send to the base station at present as yet.

Wherein, first PDCP packet that does not successfully send to the 2nd UE of base station or a UE can be that a UE sends to the base station, but the PDCP packet that the base station never sent to the 2nd UE also can be the base station to be sent to the 2nd UE but did not successfully send to the PDCP packet of the 2nd UE.

Step 1607, a UE return from the base station first successfully do not send to the PDCP sequence number of the PDCP packet of the 2nd UE, for first PDCP packet and subsequent P DCP allocation of packets PDCP sequence number that does not successfully send to the 2nd UE, directly send to the 2nd UE then.

Preferably, a UE can be from the base station first PDCP packet that does not successfully send to the 2nd UE PDCP packet and subsequent P DCP packet of beginning first is not successfully sent to the 2nd UE directly send to the 2nd UE.

In the present embodiment, the base station is by offering a UE with first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE, the UE that wins can be used with the base station uses the identical mode of PDCP sequence number for directly sending to the PDCP allocation of packets PDCP sequence number of the 2nd UE, guarantee the consistency of the PDCP sequence number of the PDCP packet that the 2nd UE receives, avoided the packet loss that occurs because of the conflict of PDCP sequence number.

Step 1608, the 2nd UE receive the PDCP packet that a UE directly sends.

Further, if the base station sends the PDCP packet that is restored by all or part of PDCP packet that is packaged into and does not send to as yet the 2nd UE again to the 2nd UE, then the 2nd UE receives the base station and according to the corresponding relation that records all or part of PDCP packet that be packaged into again and that do not send to the 2nd UE is as yet reduced the PDCP packet that generates.In the present embodiment, when a UE and the 2nd UE use cell pattern to communicate, the PDCP sequence number of the PDCP packet of UE transmission is recorded in the base station, the IP sequence number of the IP packet in the PDCP packet that the one UE sends, corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number of the PDCP packet that the base station is packaged into again and the PDCP packet that the base station is packaged into again, when carrying out the pattern switching, corresponding relation according to record provides first PDCP sequence number that PDCP packet that does not successfully send to the 2nd UE uses to a UE, so that a UE uses identical PDCP sequence number to send the PDCP packet to the 2nd UE with the base station, for carrying out successfully that pattern is switched and guaranteeing in the handoff procedure not packet loss or packet loss is minimum lays the foundation, thereby make the communication pattern of win UE and the 2nd UE switch to the D2D pattern by cell pattern, and guarantee packet loss.

The structural representation of the UE that Figure 17 A provides for one embodiment of the invention.Shown in Figure 17 A, the UE of present embodiment comprises: first sending module 171, first receiver module 172 and second sending module 173.

Wherein, first sending module 171 is connected with the 2nd UE, is used for sending packet to the 2nd UE with the D2D pattern.First receiver module 172 is connected with the base station, and what be used for to receive that the base station sends switches to the switching command of cell pattern by the D2D pattern.Second sending module 173, be connected with the base station with first receiver module 172, for the switching command that receives according to first receiver module 172, will be under the D2D pattern first successfully do not send to the packet of the 2nd UE and follow-up packet sends to the base station, by the base station packet is sent to the 2nd UE.

Wherein, follow-up packet comprises present embodiment UE, and first does not successfully send to packet all packets afterwards of the 2nd UE, comprises that perhaps first packet that does not successfully send to the 2nd UE of present embodiment UE does not successfully send to the packet of the 2nd UE afterwards.

Each functional module of present embodiment UE can be used for carrying out the flow process of data transmission method for uplink shown in Figure 1, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.The UE of present embodiment is equivalent to the UE in the method shown in Figure 1.

The UE of present embodiment and the 2nd UE use the D2D pattern to communicate, receive the switching command of base station transmission as the UE of present embodiment after, begin to send packet by the base station to the 2nd UE from first packet that does not successfully send to the 2nd UE, and no longer directly send packet to the 2nd UE, finished the switching from the D2D pattern to cell pattern.

The structural representation of the UE that Figure 17 B provides for another embodiment of the present invention.Present embodiment realizes that based on Figure 17 A illustrated embodiment shown in Figure 17 B, first sending module of present embodiment specifically is used for sending the PDCP packet to the 2nd UE with the D2D pattern.Based on this, first does not successfully send to the packet of the 2nd UE and follow-up packet comprises present embodiment UE: first does not successfully send to PDCP packet and the subsequent P DCP packet of the 2nd UE.Described subsequent P DCP packet comprises all the PDCP packets after first PDCP packet that does not successfully send to the 2nd UE, comprises that perhaps first PDCP packet that does not successfully send to the 2nd UE does not successfully send to the PDCP packet of the 2nd UE afterwards.

Shown in Figure 17 B, the UE of present embodiment also comprises: the 3rd sending module 174.

The 3rd sending module 174 is connected with the base station, is used for first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE is sent to the base station.Like this, the base station can be encapsulated as the PDCP packet with the IP packet that gateway is issued again from the IP allocation of packets PDCP sequence number that first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE of present embodiment UE begins to issue for gateway.

Optionally, the UE of present embodiment also comprises: replacement module 175.

Replacement module 175, be connected with second sending module 173, being used for will be in that first successfully send to before the PDCP packet of the 2nd UE and subsequent P DCP packet send to the base station under the D2D pattern at second sending module 173, and resetting, first does not successfully send to the PDCP packet and PDCP sequence number subsequent P DCP packet of the 2nd UE.Like this, the base station can be encapsulated as the PDCP packet with the IP packet that gateway is issued again from the IP allocation of packets PDCP sequence number that PDCP sequence number 0 begins to issue for gateway.

Further, second sending module 173 concrete being used for successfully do not send to the PDCP packet of the 2nd UE with first and follow-uply sent but sending but the PDCP sequence number that successfully do not send to the PDCP packet of the 2nd UE sends to the base station together to the 2nd UE with follow-up of successfully not sending to the PDCP packet of the 2nd UE and first PDCP packet that does not send to the 2nd UE to the 2nd UE.Like this, the base station present embodiment UE that present embodiment UE can be sent first successfully do not send to the 2nd UE PDCP packet and follow-up to the 2nd UE sent but the PDCP sequence number that successfully do not send to the PDCP packet of the 2nd UE be encapsulated in present embodiment UE first successfully do not send to the 2nd UE PDCP packet and follow-up sent but successfully do not sent in the IP packet in the PDCP packet of the 2nd UE to the 2nd UE send to gateway and receive the IP packet that comprises the PDCP sequence number that gateway issues.

Optionally, the UE of present embodiment also comprises: second receiver module 176.

Second receiver module 176, be connected with second sending module 173 with the 2nd UE, be used for to receive that the 2nd UE returns first does not successfully send to other PDCP packets that successfully receive after the PDCP packet of the 2nd UE at present embodiment UE, and offer second sending module 173.

Further, present embodiment first sending module 171 can also specifically send PDCP SDU, RLC SDU, MAC SDU or MAC PDU etc. with the D2D pattern to the 2nd UE.

Further, have gateway function in the base station, do not need to report the packet that receives to gateway, and when directly transmitting to the 2nd UE, the UE of present embodiment also comprises: encrypting module 177.

Encrypting module 177, be used for first successfully not being sent to before the packet of the 2nd UE and follow-up packet send to the 2nd UE with the D2D pattern at second sending module 173, use the key of making an appointment with the 2nd UE that first is not successfully sent to the packet of the 2nd UE and follow-up packet is encrypted.

Above-mentioned each functional module can be used for the corresponding flow process in execution graph 4A, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 or Figure 10 or the data processing method shown in Figure 11, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

When the UE of present embodiment has solved the 2nd UE and had not only received the PDCP packet that sends by the base station but also received the PDCP packet that the UE of present embodiment directly sends by above-mentioned each functional module, cause the problem of packet loss because of the PDCP sequence number conflict of PDCP packet use, guaranteed that the 2nd UE can successfully receive the PDCP packet that the UE of base station and present embodiment sends, guaranteed in the communication pattern handoff procedure that packet is not lost or the packet loss of packet is reduced to alap level.

The structural representation of the base station that Figure 18 A provides for one embodiment of the invention.Shown in Figure 18 A, the base station of present embodiment comprises: the 4th sending module 181, the 3rd receiver module 182, first package module 183 and the 5th sending module 184.

Wherein, the 4th sending module 181 is connected with a UE, is used for sending the switching command that is switched to cell pattern by the D2D pattern to a UE, switches to by the base station to the 2nd UE transmission packet from sending packet with the D2D pattern to the 2nd UE to indicate a UE.

The 3rd receiver module 182 is connected with a UE, and first does not successfully send to PDCP packet and the subsequent P DCP packet of the 2nd UE for a UE under cell pattern who receives UE transmission.Wherein, subsequent P DCP packet comprises a UE, and first does not successfully send to PDCP packet all PDCP packets afterwards of the 2nd UE, comprises that perhaps first PDCP packet that does not successfully send to the 2nd UE of a UE does not successfully send to the PDCP packet of the 2nd UE afterwards.

First package module 183, be connected with the 3rd receiver module 182, the PDCP packet that a UE who is used for that the 3rd receiver module 182 is received sends sends to gateway and receives the IP packet that gateway issues, and the IP allocation of packets PDCP sequence number that issues for gateway is packaged into the PDCP packet again with the IP packet that gateway is issued then.

The 5th sending module 184 is connected with the 2nd UE with first package module 183, and the PDCP packet that is used for first package module 183 is packaged into again sends to the 2nd UE.

Each functional module of present embodiment base station can be used for carrying out the flow process of data transmission method for uplink shown in Figure 3, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

The base station of present embodiment, detecting when needing to use cell pattern to communicate between a UE and the 2nd UE, send switching command to a UE, the one UE switches to cell pattern according to switching command from the D2D pattern, namely send the PDCP data by the base station to the 2nd UE, thereby finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE.

The structural representation of the base station that Fig. 1 8B provides for another embodiment of the present invention.Present embodiment is based on realization embodiment illustrated in fig. 18, and shown in Figure 18 B, first package module 183 of present embodiment specifically can be used for receiving the IP packet that gateway issues according to the order that receives the PDCP packet that the base station sends.

Further, first package module 183 of present embodiment can be used for specifically since a UE that first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE is the PDCP packet for the IP allocation of packets PDCP sequence number that gateway issues with the IP packet encapsulation that again gateway is issued.

Optionally, the base station of present embodiment also comprises: the 4th receiver module 185.

The 4th receiver module 185 is connected with a UE or the 2nd UE, and first does not successfully send to the PDCP sequence number of the PDCP packet of the 2nd UE for a UE who receives UE transmission; Perhaps first does not successfully send to the PDCP sequence number of the PDCP packet of the 2nd UE for a UE who receives the 2nd UE transmission.Wherein, concerning the 2nd UE, first PDCP packet that does not successfully send to the 2nd UE of a UE is the PDCP packet that first UE who does not successfully receive of the 2nd UE sends.

Optionally, the base station of present embodiment also comprises: first logging modle 186.

First logging modle 186 is connected with the 3rd receiver module 182, is used for the PDCP sequence number that a UE that record the 3rd receiver module 182 receives sends to first PDCP packet of base station.Wherein, a UE send to first PDCP packet of base station be a UE first successfully do not send to the PDCP packet of the 2nd UE.

In the present embodiment, the 4th receiver module 185 or first logging modle 186 also can offer first package module 183 with first the PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE of a UE that obtains.

Further, first package module 183 of present embodiment can also be reset first when successfully not sending to the PDCP sequence number PDCP packet and subsequent P DCP packet of the 2nd UE at a UE, and beginning with sequence number 0 is that the IP allocation of packets PDCP sequence number that gateway issues is encapsulated as the PDCP packet again with the IP packet that gateway is issued.

Optionally, the base station of present embodiment also comprises: second logging modle 187.

Second logging modle 187, be connected the corresponding relation between the IP sequence number of the IP packet of the PDCP packet that the PDCP sequence number of the PDCP packet that a UE who receives for record the 3rd receiver module 182 sends and a UE send with the 3rd receiver module 182.

Based on second logging modle 187, first package module 183 of present embodiment can also be the PDCP sequence number of the IP allocation of packets correspondence that issues of gateway according to the corresponding relation of second logging modle 187 record, is encapsulated as the PDCP packet again with the IP packet that gateway is issued.

Wherein, the 3rd receiver module 182 be used for to receive also that a UE sends first successfully do not send to the PDCP packet of the 2nd UE and follow-uply sent to the 2nd UE but successfully do not send to the PDCP sequence number of the PDCP packet of the 2nd UE.Accordingly, the UE that first package module 183 sends a UE first successfully do not send to the 2nd UE the PDCP packet and follow-up to the 2nd UE sent but the PDCP sequence number that successfully do not send to the PDCP packet of the 2nd UE be encapsulated in a UE first successfully do not send to the 2nd UE the PDCP packet and follow-up sent but successfully do not sent in the IP packet in the PDCP packet of the 2nd UE to the 2nd UE send to gateway, and receive the IP packet that comprises the PDCP sequence number that gateway issues, the UE that the one UE is sent never sends to gateway to the PDCP packet that the 2nd UE sent, and receive the IP packet that does not comprise the PDCP sequence number that gateway issues, the entrained PDCP sequence number of the IP packet that carries the PDCP sequence number that issues according to gateway then, each IP allocation of packets PDCP sequence number for gateway issues is encapsulated as the PDCP packet again with the IP packet that gateway is issued.

Above-mentioned each functional module can be used for the corresponding flow process in execution graph 4A, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 or the data processing method shown in Figure 10, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

When the base station of present embodiment has solved the 2nd UE and had not only received the PDCP packet that sends by the base station but also received the PDCP packet that the UE of present embodiment directly sends by above-mentioned each functional module, cause the problem of packet loss because of the PDCP sequence number conflict of PDCP packet use, guaranteed that the 2nd UE can successfully receive the PDCP packet that the UE of base station and present embodiment sends, guaranteed in the communication pattern handoff procedure that packet is not lost or the packet loss of packet is reduced to alap level.

The structural representation of the UE that Figure 19 A provides for further embodiment of this invention.Shown in Figure 19 A, the UE of present embodiment comprises: the 5th receiver module 191 and the 6th receiver module 192.

Wherein, the 5th receiver module 191 is connected with a UE, is used for receiving the PDCP packet that a UE directly sends.

The 6th receiver module 192 is connected with the base station, is used for receiving the PDCP packet that the base station sends.Wherein, the PDCP packet that the base station sends to the 2nd UE be the base station to a UE send switch to the switching command of cell pattern by the D2D pattern after, first does not successfully send to the UE that a UE is sent the PDCP packet of UE of present embodiment and subsequent P DCP packet send to gateway and PDCP packet that gateway is sent according to the base station sends IP packet and encapsulates again and form.Wherein, subsequent P DCP packet comprises a UE, and first does not successfully send to PDCP packet all PDCP packets afterwards of the UE of present embodiment, comprises that perhaps first PDCP packet that does not successfully send to the UE of present embodiment of a UE does not successfully send to the PDCP packet of the UE of present embodiment afterwards.

Each functional module of present embodiment UE can be used for carrying out the flow process of data receive method shown in Figure 3, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.The UE of present embodiment is equivalent to the 2nd UE in the method shown in Figure 3.

The UE of present embodiment receives the PDCP packet that a UE directly sends earlier, when the communication pattern between the UE of a UE and present embodiment switches to cell pattern by the D2D pattern, the UE of present embodiment receives the PDCP packet that a UE sends by the base station, the match switching of the communication pattern that the UE that is combined into a UE and present embodiment uses of the UE of present embodiment and a UE provides condition, makes the communication pattern of the UE of win UE and present embodiment switch to cell pattern by the D2D pattern.

The structural representation of the UE that Figure 19 B provides for further embodiment of this invention.Present embodiment can realize that shown in Figure 19 B, the UE of present embodiment also comprises: the 6th sending module 193 based on Figure 19 A illustrated embodiment.

The 6th sending module 193, be connected with the base station, be used for first PDCP sequence number that does not successfully send to the PDCP packet of UE of a UE is sent to the base station, first DCP sequence number that does not successfully send to the PDCP packet of UE is encapsulated as the PDCP packet for the IP allocation of packets PDCP sequence number that gateway issues again with the IP packet that gateway is issued so that the base station is since a UE.

The 6th receiver module 192 concrete PDCP packets that are used for according to the UE transmission that has successfully received, the PDCP packet that reception and storage base station send.Wherein, the PDCP sequence number of the PDCP packet of base station transmission is the PDCP sequence number of first PDCP packet that does not successfully send to the 2nd UE since a UE.Perhaps, the PDCP packets that the 6th receiver module 192 specifically is used for the base station is sent are as new business datum, and independent reception is also stored the PDCP packet that the base station sends.Wherein, the PDCP sequence number of the PDCP packet of base station transmission is not the PDCP sequence number of first PDCP packet that does not successfully send to the 2nd UE since a UE.

Optionally, the UE of present embodiment also comprises: the 7th sending module 194.

The 7th sending module 194, be connected with a UE, the PDCP packet that is used for successfully receiving after first does not successfully receive the PDCP packet of UE transmission sends to a UE, and the PDCP packet deletion that will successfully receive after first does not successfully receive the PDCP packet of UE transmission.

The UE of present embodiment is by matching with a UE and base station that the embodiment of the invention provides, when having solved UE and not only received the PDCP packet that a UE sends by the base station but also received the PDCP packet that a UE directly sends by above-mentioned each functional module, cause the problem of packet loss because of the PDCP sequence number conflict of PDCP packet use, the UE that has guaranteed present embodiment can successfully receive the PDCP packet that base station and a UE send, and guarantees in the communication pattern handoff procedure that packet is not lost or the packet loss of packet is reduced to alap level.

The structural representation of the UE that Figure 20 A provides for further embodiment of this invention.As shown in figure 20, the UE of present embodiment comprises: the 8th sending module 2001, the 7th receiver module 2002 and the 9th sending module 2003.

Wherein, the 8th sending module 2001 is connected with the 2nd UE, is used for directly sending packet to the 2nd UE.

The 7th receiver module 2002 is connected with the base station, and what be used for to receive that the base station sends switches to the switching command of cell pattern by the D2D pattern.

The 9th sending module 2003, be connected with the base station with the 7th receiver module 2002, for the switching command that receives according to the 7th receiver module 2002, successfully do not send to the packet of the 2nd UE from first, first is not successfully sent to the packet of the 2nd UE and follow-up packet sends to the base station, so that the packet that the base station directly sends the UE of present embodiment is transmitted to the 2nd UE.

Each functional module of present embodiment UE can be used for carrying out the flow process of data transmission method for uplink shown in Figure 11, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.The UE of present embodiment is equivalent to the UE in the method shown in Figure 11.

The UE of present embodiment matches with the base station, behind the switching command that receives the base station transmission, begin to send the PDCP packet by the base station to the 2nd UE from first PDCP packet that does not successfully send to the 2nd UE, and no longer directly send the PDCP packet to the 2nd UE, finished the switching from the D2D pattern to cell pattern.

The structural representation of the UE that Figure 20 B provides for further embodiment of this invention.Present embodiment realizes that based on Figure 20 A illustrated embodiment shown in Figure 20 B, the UE of present embodiment also comprises: encrypting module 2004.

Encrypting module 2004, be connected with the 9th sending module 2003, be used for successfully not sending to the packet of described the 2nd UE at the 9th sending module 2003 from first, first is not successfully sent to the packet of described the 2nd UE and follow-up packet send to before the described base station, use the key of making an appointment with described the 2nd UE that first is not successfully sent to the packet of described the 2nd UE and follow-up packet is encrypted.

Preferably, the packet of present embodiment can be PDCP SDU, RLC SDU, MAC SDU or MAC PDU.

The UE of present embodiment is by matching with the base station, because the base station no longer reports the packet that receives to gateway, so the UE of present embodiment can directly use the key of appointing with the 2nd UE that packet is encrypted by encrypting module, and do not need to carry out key agreement with the base station, reduce the Signalling exchange flow process, be conducive to improve the efficient of transfer of data.

The structural representation of the base station that Figure 21 A provides for further embodiment of this invention.Shown in Figure 21 A, the base station of present embodiment comprises: the tenth sending module 211, the 8th receiver module 212 and the 11 sending module 213.

Wherein, the tenth sending module 211 is connected with a UE, is used for sending the switching command that is switched to cell pattern by the D2D pattern to a UE, switches to by the base station to the 2nd UE transmission data from sending data with the D2D pattern to the 2nd UE to indicate a UE.

The 8th receiver module 212 is connected with a UE, and first does not successfully send to the packet of the 2nd UE and follow-up packet for a UE under the D2D pattern who receives UE transmission.

The 11 sending module 213 is connected with the 2nd UE with the 8th receiver module 212, and the packet that a UE who is used for that the 8th receiver module 212 is received sends directly is transmitted to the 2nd UE.

Each functional module of present embodiment base station can be used for carrying out the flow process of data transmission method for uplink shown in Figure 12, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

The base station of present embodiment is by carrying out the function expansion, have gateway simultaneously and carry out traffic statistics, functions such as charging, can be with the packet report gateway that receives and directly be transmitted to the 2nd UE, do not need to be again IP allocation of packets PDCP sequence number, both finished the switching of communication pattern from the D2D pattern to cell pattern between a UE and the 2nd UE, the PDCP packet that can not make the base station send to the 2nd UE again conflicts with the PDCP packet transmission that a UE who has successfully received sends, and has guaranteed not take place packet loss or reduced packet loss as far as possible in the communication pattern handoff procedure.

The structural representation of the base station that Figure 21 B provides for further embodiment of this invention.Present embodiment realizes that based on Figure 21 A illustrated embodiment shown in Figure 21 B, the base station of present embodiment also comprises: reduction statistical module 214.

Reduction statistical module 214, be connected with the 8th receiver module 212, the packet that a UE who is used for that the 8th receiver module 212 is received sends is reduced to the IP packet, and adds up flow between a UE and the 2nd UE according to the IP packet that restores, so that carry out charge on traffic.

Optionally, the base station of present embodiment also comprises: reduction reporting module 215.

Reduction reporting module 215, be connected with the 8th receiver module 212, the packet that a UE who is used for that the 8th receiver module 212 is received sends is reduced to the IP packet, and add up flow between a UE and the 2nd UE according to the IP packet that restores, and the flow information that counts is reported gateway.

Above-mentioned each functional module can be used for carrying out the flow process of data transmission method for uplink shown in Figure 12, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

The base station of present embodiment has realized that by reduction statistical module or reduction reporting module gateway carries out functions such as traffic statistics, charging, and the packet that directly a UE is sent for the base station is transmitted to the 2nd UE and lays the foundation.

The structural representation of the UE that Figure 22 A provides for further embodiment of this invention.Shown in Figure 22 A, the UE of present embodiment comprises: the 12 sending module 221, the 9th receiver module 222 and the 13 sending module 223.

Wherein, the 12 sending module 221 is connected with the base station, is used for the packet to base station transmission PDCP.

The 9th receiver module 222 is connected with the base station, and what be used for to receive that the base station sends switches to the switching command of D2D pattern by cell pattern.

The 13 sending module 223, be connected with the 2nd UE with the 9th receiver module 222, switching command for receiving according to the 9th receiver module 222 will send to the 2nd UE with the D2D pattern at first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE under the cell pattern.

Each functional module of the UE of present embodiment can be used for carrying out the flow process of data transmission method for uplink shown in Figure 13, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.The UE of present embodiment is equivalent to the UE in embodiment illustrated in fig. 13.

When the UE of present embodiment and the 2nd UE use cell pattern to communicate, the base station sends switching command to present embodiment UE, present embodiment UE begins directly to send to the 2nd UE from first PDCP packet that does not successfully send to the 2nd UE according to switching command, thereby makes the communication pattern of present embodiment UE and the 2nd UE switch to the D2D pattern by cell pattern.

The structural representation of the UE that Figure 22 B provides for further embodiment of this invention.Present embodiment can realize that shown in Figure 22 B, the UE of present embodiment also comprises: the tenth receiver module 224 based on Figure 22 A illustrated embodiment.

The tenth receiver module 224 is connected with the 13 sending module 223 with the base station, is used for receiving the PDCP packet that the base station is returned, and offers the 13 sending module 223.Wherein, the PDCP packet that returns of base station is the PDCP packet that the base station does not send to gateway as yet; Perhaps, to be the base station reduce the PDCP packet that generates according to the corresponding relation of record to all or part of PDCP packet that is packaged into and does not send to as yet the 2nd UE again to the PDCP packet that returns of base station.

Optionally, the UE of present embodiment also comprises: the 11 receiver module 225.

The 11 receiver module 225 is connected with the base station, be used for to receive the notification message that the base station sends, and sends to the 2nd UE according to the PDCP packet that notification message knows that the base station will not send as yet and needs send to the 2nd UE and to finish.Further, the 11 receiver module 225 also be used for to receive the base station will need to return to the PDCP packet of a UE to the UE passback notification message that passback that the back sends finishes that finishes.Wherein, the PDCP packet that does not send and need send to the 2nd UE as yet refers to that the base station is after sending switching command, definite needs send to the various PDCP packets of the 2nd UE, for example can be to have received but do not report the PDCP packet of gateway and/or the PDCP packet that is packaged into again by the IP packet that gateway issues as yet, all or part of PDCP packet that can also to be the base station restore according to the corresponding relation of record.

Optionally, the UE of present embodiment also comprises: the 12 receiver module 226.

The 12 receiver module 226, be connected with the 13 sending module 223 with the base station, first does not successfully send to the PDCP sequence number of the PDCP packet of the 2nd UE for a UE who receives the base station notice, and first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE of a UE that will receive offers the 13 sending module 223.

Further, the tenth receiver module 224 of present embodiment also is used for receiving the PDCP sequence number of the PDCP packet that returns the base station, and the PDCP sequence number that receives being offered the 13 sending module 223 when receiving the PDCP packet that returns the base station.

Further, the 13 sending module 223 concrete PDCP sequence numbers for the PDCP packet that returns according to the base station of present embodiment, upgrade first PDCP packet that does not successfully send to the 2nd UE and PDCP sequence number subsequent P DCP packet, the PDCP packet after will upgrading then directly sends to the 2nd UE.

Above-mentioned each functional module can be used for carrying out above-mentioned Figure 13-middle the 2nd UE of assurance embodiment illustrated in fig. 15 and successfully receives present embodiment UE with the method flow of the PDCP packet of D2D pattern transmission, and its concrete operation principle repeats no more.

The UE of present embodiment makes the 2nd UE can successfully receive the PDCP packet that present embodiment UE sends with the D2D pattern by above-mentioned each functional module, avoided conflicting between the PDCP sequence number of the PDCP packet that sends with the base station, guaranteed in the pattern handoff procedure not packet loss or packet loss has been dropped to minimum.

The structural representation of the base station that Figure 23 A provides for further embodiment of this invention.Shown in Figure 23 A, the base station of present embodiment comprises: the 13 receiver module 231, second package module 232, the 14 sending module 234 and the 15 sending module 235.

Wherein, the 13 receiver module 231 is connected with a UE, be used for to receive the PDCP packet that a UE sends, and the PDCP packet that a UE is sent sends to gateway and receives the IP packet that PDCP packet that gateway sends according to the base station issues.

Second package module 232 is connected with the 13 receiver module 231, and the IP allocation of packets PDCP sequence number that the gateway that is used to the 13 receiver module 231 to receive issues is packaged into the PDCP packet again with the IP packet that gateway is issued.

The 14 sending module 234 is connected with the 2nd UE with second package module 232, and the PDCP packet that is used for second package module 232 is packaged into again sends to the 2nd UE.

The 15 sending module 235, be connected with a UE, be used for sending the switching command that is switched to the D2D pattern by cell pattern to a UE, will under cell pattern, send to the 2nd UE with the D2D pattern by first PDCP packet and subsequent P DCP packet that does not successfully send to the 2nd UE of a UE to indicate a UE according to switching command.

Each functional module of present embodiment base station can be used for carrying out the flow process of data transmission method for uplink shown in Figure 14, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

The base station of present embodiment, use cell pattern to communicate in the process at a UE and the 2nd UE, send switching command to a UE, make the UE that wins begin directly to send the PDCP packet to the 2nd UE from first PDCP packet that does not successfully send to the 2nd UE, make the communication pattern of win UE and the 2nd UE switch to the D2D pattern by cell pattern.

The structural representation of the base station that Figure 23 B provides for further embodiment of this invention.Present embodiment is realized based on Figure 23 A illustrated embodiment, shown in Figure 23 B, second package module, the 232 concrete IP sequence numbers for the IP packet that issues according to gateway of present embodiment, obtain the PDCP packet of the IP packet correspondence that the gateway that has described IP sequence number issues, IP packet with the PDCP serial number assignment of the PDCP packet that obtains issues to gateway is packaged into the PDCP packet again with the IP packet that gateway is issued.

Further, the base station of present embodiment also comprises: judge module 236 and the 3rd logging modle 233.

Judge module 236 is connected with the 3rd logging modle 233, is used for the D2D ability information that reports according to a UE and the 2nd UE, judges whether a UE and the 2nd UE support the D2D pattern simultaneously.

The 3rd logging modle 233, be connected with second package module 232 with the 13 receiver module 23 1, be used in the judged result of judge module 236 when being, record the PDCP sequence number of the IP sequence number of the IP packet in the PDCP packet of PDCP sequence number, UE transmission of the PDCP packet that a UE sends, the PDCP packet that is packaged into again and the PDCP packet that is packaged into again in the IP sequence number of IP packet between corresponding relation.The IP allocation of packets PDCP sequence number that described corresponding relation is used to gateway to issue by second package module 232.

Optionally, the base station of present embodiment also comprises: the 16 sending module 237.

The 16 sending module 237 is connected with a UE, is used for the PDCP packet that does not send to gateway as yet that a UE sends is returned to a UE.

Optionally, the base station of present embodiment also comprises: the 17 sending module 238.

The 17 sending module 238, be connected with the 2nd UE with the 3rd logging modle 233, be used for all or part of PDCP packet that is packaged into and does not send to as yet the 2nd UE is again reduced, and the PDCP packet that restores is sent to the 2nd UE or returns to a UE.

Optionally, the base station of present embodiment also comprises: the 18 sending module 239.

The 18 sending module 239 is connected with a UE with the 17 sending module 238, is used for sending a notification message to a UE, finishes to inform that a UE has sent the PDCP packet that does not send and need send to the 2nd UE as yet to the 2nd UE.Wherein, the PDCP packet that does not send and need send to the 2nd UE as yet refers to that the base station is after sending switching command, definite needs send to the various PDCP packets of the 2nd UE, for example can be to have received but do not report the PDCP packet of gateway and/or the PDCP packet that is packaged into again by the IP packet that gateway issues as yet, all or part of PDCP packet that can also to be the base station restore according to the corresponding relation of record.

Optionally, the base station of present embodiment also comprises: the 19 sending module 240.

The 19 sending module 240 is connected with a UE, be used for to a UE notify a UE first successfully do not send to the PDCP sequence number of the PDCP packet of the 2nd UE.

Further, the 16 sending module 237 of present embodiment also is used for when returning the PDCP packet to a UE, and the PDCP sequence number of the PDCP packet that returns is sent to a UE.

Optionally, the base station of present embodiment also comprises: the 20 sending module 241.

The 20 sending module 241, be connected with the 2nd UE with the 3rd logging modle 233, be used for sending to the 2nd UE the corresponding relation of the 3rd logging modle 233 records, so that the PDCP sequence number of the PDCP packet that the base station that the 2nd UE receives according to corresponding relation renewal success sends.

Above-mentioned each functional module can be used for the corresponding flow process among the execution graph 13-method embodiment shown in Figure 16, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

The base station of present embodiment, when using cell pattern to communicate at a UE and the 2nd UE, record the PDCP sequence number of the PDCP packet of UE transmission, the IP sequence number of the IP packet in the PDCP packet that the one UE sends, corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number of the PDCP packet that the base station is packaged into again and the PDCP packet that the base station is packaged into again, for carrying out successfully that pattern is switched and guaranteeing in the handoff procedure not packet loss or packet loss is minimum lays the foundation, thereby make the communication pattern of win UE and the 2nd UE switch to the D2D pattern by cell pattern, and guarantee packet loss.

The structural representation of the UE that Figure 24 A provides for further embodiment of this invention.Shown in Figure 24 A, the UE of present embodiment comprises: the 14 receiver module 251 and the 15 receiver module 252.

Wherein, the 14 receiver module 251 is connected with the base station, is used for receiving the PDCP packet that the base station sends.Wherein, the PDCP packet that the base station sends is that the base station receives the PDCP packet that a UE sends, the PDCP packet that the IP packet that the PDCP packet that a UE is sent sends to gateway and PDCP packet that gateway is sent according to the base station issues is packaged into again.Wherein, the base station record the PDCP sequence number of the IP sequence number of PDCP sequence number, the IP packet in the PDCP packet that a UE sends of the PDCP packet that a UE sends, the PDCP packet that is packaged into again and the PDCP packet that is packaged into again in the sequence number of IP packet between corresponding relation.

The 15 receiver module 252 is connected with a UE, is used for receiving the PDCP packet that a UE directly sends.Wherein, the UE switching command that switches to the D2D pattern by cell pattern that directly to send to the PDCP packet of present embodiment UE be a UE sends according to the base station begins to send from the PDCP packet that first does not successfully send to present embodiment UE.

Each functional module of present embodiment UE can be used for carrying out the flow process of data receive method shown in Figure 15, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.The UE of present embodiment is equivalent to the 2nd UE in embodiment illustrated in fig. 15.

The UE of present embodiment is by matching with a UE and base station, and a UE between communication pattern when switching to the D2D pattern by cell pattern, the PDCP sequence number of the PDCP packet that a UE who records when the cell pattern based on the base station sends, the IP sequence number of the IP packet in the PDCP packet that the one UE sends, corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number of the PDCP packet that the base station is packaged into again and the PDCP packet that the base station is packaged into again, can successfully receive a UE with the PDCP packet that the D2D pattern sends, realize that communication pattern switches to the D2D pattern by cell pattern between the UE.

The structural representation of the UE that Figure 24 B provides for further embodiment of this invention.Present embodiment realizes that based on Figure 24 A illustrated embodiment shown in Figure 24 B, the UE of present embodiment also comprises: the 16 receiver module 253.

The 16 receiver module 253 is connected with the base station, be used for to receive the base station and according to the corresponding relation that records the PDCP packet that is packaged into again and do not send to the 2nd UE is as yet reduced the PDCP packet that generates.

Optionally, the UE of present embodiment also comprises: the 17 receiver module 254.

The 17 receiver module 254 is connected with the base station, is used for the corresponding relation that the reception base station sends, and upgrades the PDCP sequence number of the PDCP packet of the successful base station transmission that receives according to corresponding relation.

Above-mentioned each functional module can be used for the corresponding flow process among the execution graph 13-method embodiment shown in Figure 16, and its concrete operation principle repeats no more.

The UE of present embodiment by above-mentioned each functional module solved by cell pattern in D2D pattern handoff procedure, collision problem between the PDCP sequence number of the PDCP packet that the PDCP packet that the base station sends and a UE send, avoided causing because of the conflict of PDCP sequence number the problem of data-bag lost, guaranteed in the communication pattern handoff procedure not packet loss or packet loss has been dropped to minimum.

The structural representation of the gateway that Figure 25 provides for one embodiment of the invention.As shown in figure 25, the gateway of present embodiment comprises: the 18 receiver module 261 and the 21 sending module 262.

Wherein, the 18 receiver module 261 is connected with the base station, and what be used for the transmission of reception base station sends to the IP packet of the 2nd UE by a UE, and records the order that receives the IP packet.Wherein, the IP packet that the base station sends is that PDCP packet that the base station sends a UE carries out decapsulation and obtains, and the IP packet comprises the sign of a UE and the sign of the 2nd UE.

The 21 sending module 262, be connected with the base station with the 18 receiver module 261, be used for to the 18 receiver module 261 receive the IP packet handle, and the order that records according to the 18 receiver module 261 issues the IP packet after the processing to the base station.Like this, the base station can be after the IP packet that gateway is issued be packaged into the PDCP packet again, sends the PDCP packet that the order of PDCP packet will be packaged into again according to a UE and sends to the 2nd UE.

Further, the gateway of present embodiment also comprises: the 19 receiver module 263.

The 19 receiver module 263 is connected with the 18 receiver module 261 with the base station, and for the sign of a UE who receives the base station transmission and the sign of the 2nd UE, and the sign of the sign of a UE that will receive and the 2nd UE offers the 18 receiver module 261.

The 18 receiver module 261 is concrete for the sign of a UE who provides according to the 19 receiver module 263 and the sign of the 2nd UE, in the IP packet that the base station sends, identify the IP packet that is sent to the 2nd UE by a UE, and record receives the order that is sent to the IP packet of the 2nd UE by a UE.

Each functional module of present embodiment gateway can be used for carrying out the handling process of gateway in the data transmission method for uplink shown in Figure 12, and its concrete operation principle repeats no more, and sees the description of method embodiment for details.

The gateway of present embodiment is by knowing the sign of a UE and the 2nd UE in advance, and identify and record the reception order that a UE sends to the IP packet of the 2nd UE accordingly, issue IP packet after the processing to the base station according to the reception order then, it is identical to make order that the base station receives the PDCP packet that a UE sends and base station send to the order of PDCP packet of the 2nd UE, and then it is identical to make that PDCP sequence number and a UE of the base station IP allocation of packets that first PDCP sequence number that does not successfully send to the PDCP packet of the 2nd UE issues for gateway since a UE directly send to the PDCP sequence number that the 2nd UE uses, thereby the conflict between a UE who has avoided the 2nd UE the to receive PDCP sequence number that send and the PDCP packet that the base station sends, make the 2nd UE can successfully receive the PDCP packet of transmitting the base station and packet loss does not take place, in the communication pattern handoff procedure, guaranteeing not packet loss or packet loss is minimum lays the foundation.

One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each method embodiment can be finished by the relevant hardware of program command.Aforesaid program can be stored in the computer read/write memory medium.This program is carried out the step that comprises above-mentioned each method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although the present invention has been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.

Claims

1. a data transmission method for uplink is characterized in that, comprising:

2. data transmission method for uplink according to claim 1 is characterized in that, described first user equipment (UE) sends packet to the 2nd UE with the straight-through D2D pattern of equipment and comprises:

A described UE sends PDCP PDCP packet to described the 2nd UE with the D2D pattern;

Described first successfully do not send to the packet of described the 2nd UE and follow-up packet comprises: first does not successfully send to PDCP packet and the subsequent P DCP packet of described the 2nd UE;

Described subsequent P DCP packet comprises that described all PDCP packets or described first that first does not successfully send to after the PDCP packet of described the 2nd UE successfully do not send to the PDCP packet that does not successfully send to described the 2nd UE after the PDCP packet of described the 2nd UE.

3. data transmission method for uplink according to claim 2 is characterized in that, also comprises:

A described UE sends to described base station with the described PDCP sequence number that first does not successfully send to the PDCP packet of described the 2nd UE.

4. data transmission method for uplink according to claim 2 is characterized in that, a described UE does not successfully send to the PDCP packet of described the 2nd UE and subsequent P DCP packet with first and comprises before sending to described base station:

Described first of described UE replacement successfully do not send to the PDCP packet and PDCP sequence number subsequent P DCP packet of described the 2nd UE.

5. data transmission method for uplink according to claim 2 is characterized in that, a described UE does not successfully send to the PDCP packet of described the 2nd UE and subsequent P DCP packet with first and sends to described base station and comprise:

A described UE does not successfully send to the PDCP packet of described the 2nd UE with described first and follow-uply sent but the PDCP packet and described first that successfully do not send to described the 2nd UE successfully do not send to the sending but the PDCP sequence number that successfully do not send to the PDCP packet of described the 2nd UE sends to described base station together to described the 2nd UE with follow-up of PDCP packet of described the 2nd UE to described the 2nd UE.

6. according to claim 2 or 3 or 4 described data transmission method for uplink, it is characterized in that a described UE does not successfully send to the PDCP packet of described the 2nd UE and subsequent P DCP packet with first and comprises before sending to described base station:

A described UE receives described the 2nd UE that described the 2nd UE returns and does not successfully send to other PDCP packets that successfully receive after the PDCP packet of described the 2nd UE at described first.

7. data transmission method for uplink according to claim 1 is characterized in that, a described UE does not successfully send to the packet of described the 2nd UE and follow-up packet with first and comprises before sending to described base station:

A described UE uses the key of making an appointment with described the 2nd UE that described first successfully do not sent to the packet of described the 2nd UE and follow-up packet is encrypted.

8. data transmission method for uplink according to claim 7 is characterized in that, described packet is PDCP service data unit SDU, Radio Link control RLC SDU, media access control MAC SDU or Medium Access Control (MAC) Protocol Data Unit PDU.

9. a data transmission method for uplink is characterized in that, comprising:

10. data transmission method for uplink according to claim 9 is characterized in that, described base station receives the Internet protocol IP packet that described gateway issues and comprises:

Described base station receives the IP packet that described gateway issues according to the order that receives the PDCP packet that described base station sends.

11., it is characterized in that described base station is that IP allocation of packets PDCP sequence number that described gateway issues is encapsulated as the PDCP packet again with the IP packet that described gateway is issued and comprises according to claim 9 or 10 described data transmission method for uplink:

Described base station is the PDCP packet from the IP allocation of packets PDCP sequence number that the described PDCP sequence number that first does not successfully send to the PDCP packet of described the 2nd UE begins to issue for described gateway with the IP packet encapsulation that again described gateway is issued.

12. data transmission method for uplink according to claim 11 is characterized in that, also comprises:

Described first that described base station receives described UE transmission successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE; Perhaps

Described first that described base station receives described the 2nd UE transmission successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE.

13. data transmission method for uplink according to claim 9 is characterized in that, described base station is that IP allocation of packets PDCP sequence number that described gateway issues is encapsulated as the PDCP packet again with the IP packet that described gateway is issued and comprises:

When a described UE resets described first when successfully not sending to the PDCP sequence number PDCP packet and subsequent P DCP packet of described the 2nd UE, described base station is encapsulated as the PDCP packet with the IP allocation of packets PDCP sequence number that sequence number 0 begins to issue for described gateway again with the IP packet that described gateway is issued.

14. data transmission method for uplink according to claim 9 is characterized in that, also comprises:

Corresponding relation between the IP sequence number of the IP packet in the PDCP sequence number that the PDCP packet that a described UE sends is recorded in described base station and the PDCP packet of described UE transmission;

Described base station is that IP allocation of packets PDCP sequence number that described gateway issues is encapsulated as the PDCP packet again with the IP packet that described gateway is issued and comprises:

Described base station is the PDCP sequence number of the IP allocation of packets correspondence that issues of described gateway according to described corresponding relation, is encapsulated as the PDCP packet again with the IP packet that described gateway is issued.

15. data transmission method for uplink according to claim 9 is characterized in that, also comprises:

Described base station receives that a described UE sends, and described first successfully do not send to the PDCP packet of described the 2nd UE and follow-uply sent to described the 2nd UE but successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE;

Described base station sends to the PDCP packet that a described UE sends gateway and receives the IP packet that described gateway issues, and the IP allocation of packets PDCP sequence number that issues for described gateway then is encapsulated as the PDCP packet again with the IP packet that described gateway is issued and comprises:

Described base station with a described UE send described first successfully do not send to described the 2nd UE the PDCP packet with follow-up to described the 2nd UE sent but the PDCP sequence number that successfully do not send to the PDCP packet of described the 2nd UE be encapsulated in described first successfully do not send to described the 2nd UE the PDCP packet and follow-up sent but successfully do not sent in the IP packet in the PDCP packet of described the 2nd UE to described the 2nd UE send to described gateway, and receive the IP packet that comprises the PDCP sequence number that described gateway issues;

The PDCP sequence number that the IP packet that described base station issues according to described gateway is entrained, each IP allocation of packets PDCP sequence number for described gateway issues is encapsulated as the PDCP packet again with the IP packet that described gateway is issued.

16. a data transmission method for uplink is characterized in that, comprising:

17. data transmission method for uplink according to claim 16 is characterized in that, also comprises:

Described base station is reduced to the Internet protocol IP packet with the packet that a described UE sends, and adds up flow between a described UE and described the 2nd UE according to the IP packet that restores.

18., it is characterized in that described packet is PDCP SDU, RLC SDU, MAC SDU or MAC PDU according to claim 16 or 17 described data transmission method for uplink.

19. a data transmission method for uplink is characterized in that, comprising:

First user equipment (UE) sends PDCP PDCP packet to the base station;

20. data transmission method for uplink according to claim 19 is characterized in that, also comprises:

A described UE receives the PDCP packet that returns described base station;

Wherein, the PDCP packet that returns of described base station is the PDCP packet that described base station does not send to gateway as yet; Perhaps, to be described base station reduce the PDCP packet that generates according to the corresponding relation of record to all or part of PDCP packet that is packaged into and does not send to as yet described the 2nd UE again to the PDCP packet that returns of described base station.

21. according to claim 19 or 20 described data transmission method for uplink, it is characterized in that, also comprise:

Described first that a described UE receives described base station notice successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE.

22. data transmission method for uplink according to claim 20 is characterized in that, also comprises:

A described UE receives the PDCP sequence number of the PDCP packet that returns described base station when receiving the PDCP packet that returns described base station.

23. data transmission method for uplink according to claim 22, it is characterized in that a described UE will be in that first successfully send to the PDCP packet of described the 2nd UE and subsequent P DCP packet and sends to described the 2nd UE with the D2D pattern and comprise under the cell pattern:

The PDCP sequence number of the PDCP packet that a described UE returns according to described base station, upgrade described first and successfully do not send to the PDCP packet and PDCP sequence number subsequent P DCP packet of described the 2nd UE, the PDCP packet after will upgrading then sends to described the 2nd UE with the D2D pattern.

24. a data transmission method for uplink is characterized in that, comprising:

25. data transmission method for uplink according to claim 24 is characterized in that, described base station is the IP allocation of packets PDCP sequence number that described gateway issues, and is packaged into the PDCP packet again with the IP packet that described gateway is issued and comprises:

The IP sequence number of the IP packet that described base station issues according to described gateway, obtain the PDCP packet of the IP packet correspondence that the described gateway that has described IP sequence number issues, IP packet with the PDCP serial number assignment of the PDCP packet that obtains issues for described gateway is packaged into the PDCP packet again with the IP packet that described gateway is issued.

26., it is characterized in that described base station is the IP allocation of packets PDCP sequence number that described gateway issues according to claim 24 or 25 described data transmission method for uplink, be packaged into the PDCP packet again with the IP packet that described gateway is issued and comprise before:

Described base station judges according to the D2D ability information that a described UE and described the 2nd UE report whether a described UE and described the 2nd UE support the D2D pattern simultaneously;

If judged result is for being, the corresponding relation between the IP sequence number of the PDCP sequence number of the PDCP sequence number of the PDCP packet that a described UE sends, the IP sequence number of the IP packet in the PDCP packet that a described UE sends, the described PDCP packet that is packaged into again and the IP packet in the described PDCP packet that is packaged into is again recorded in described base station;

The IP allocation of packets PDCP sequence number that described corresponding relation is used to described gateway to issue by described base station.

27. according to claim 24 or 25 described data transmission method for uplink, it is characterized in that, also comprise:

Described base station returns to a described UE with the PDCP packet that does not send to described gateway as yet that a described UE sends.

28. according to claim 24 or 25 described data transmission method for uplink, it is characterized in that, also comprise:

Reduce to all or part of described PDCP packet that is packaged into and does not send to as yet described the 2nd UE again described base station, and the PDCP packet that restores is sent to described the 2nd UE or returns to a described UE.

29. data transmission method for uplink according to claim 24 is characterized in that, also comprises:

Described base station notifies described first successfully not send to the PDCP sequence number of the PDCP packet of described the 2nd UE to a described UE.

30. data transmission method for uplink according to claim 27 is characterized in that, when the PDCP packet is returned to a described UE in described base station, the PDCP sequence number of the PDCP packet that returns is sent to a described UE.

31. data transmission method for uplink according to claim 26 is characterized in that, also comprises:

Described base station sends described corresponding relation to described the 2nd UE, upgrades the PDCP sequence number of the PDCP packet of the successful described base station transmission that receives to notify described the 2nd UE according to described corresponding relation.

32. a data receive method is characterized in that, comprising:

33. data receive method according to claim 32 is characterized in that, also comprises:

Described gateway receives the sign of the described UE that described base station sends and the sign of described the 2nd UE;

What described gateway received that the base station sends sends to the IP packet of the 2nd UE by a UE, and the order that record receives described IP packet comprises:

Described gateway is according to the sign of a described UE and the sign of described the 2nd UE, in the IP packet that described base station sends, identify the IP packet that is sent to described the 2nd UE by a described UE, and record receives the order that is sent to the IP packet of described the 2nd UE by a described UE.

34. a user equipment (UE) is characterized in that, comprising:

35. UE according to claim 34 is characterized in that, described first sending module is used for sending PDCP PDCP packet to described the 2nd UE with the D2D pattern;

36. UE according to claim 35 is characterized in that, also comprises:

The 3rd sending module is used for the described PDCP sequence number that first does not successfully send to the PDCP packet of described the 2nd UE is sent to described base station.

37. UE according to claim 35 is characterized in that, also comprises:

The replacement module, described first that be used for resetting successfully do not send to the PDCP packet and PDCP sequence number subsequent P DCP packet of described the 2nd UE.

38. UE according to claim 35, it is characterized in that described second sending module is used for described first successfully not sent to the PDCP packet of described the 2nd UE and follow-uply sending but the PDCP packet and described first that successfully do not send to described the 2nd UE do not send to the sending but the PDCP sequence number that successfully do not send to the PDCP packet of described the 2nd UE sends to described base station together to described the 2nd UE with follow-up of PDCP packet of described the 2nd UE to described the 2nd UE.

39. according to claim 35 or 36 or 37 described UE, it is characterized in that, also comprise:

Second receiver module, described the 2nd UE that returns for described the 2nd UE of reception does not successfully send to other PDCP packets that successfully receive after the PDCP packet of described the 2nd UE at described first.

40. UE according to claim 34 is characterized in that, also comprises:

Encrypting module is used for using the key of making an appointment with described the 2nd UE that described first successfully do not sent to the packet of described the 2nd UE and follow-up packet is encrypted.

41., it is characterized in that described packet is PDCP service data unit SDU, Radio Link control RLC SDU, media access control MAC SDU or Medium Access Control (MAC) Protocol Data Unit PDU according to the described UE of claim 40.

42. a base station is characterized in that, comprising:

43., it is characterized in that described first package module is for receiving the IP packet that the order of described gateway according to the PDCP packet that receives the transmission of described base station issues according to the described base station of claim 42.

44. according to claim 42 or 43 described base stations, it is characterized in that the IP allocation of packets PDCP sequence number that described first package module is used for beginning to issue for described gateway from the described PDCP sequence number that first does not successfully send to the PDCP packet of described the 2nd UE is the PDCP packet with the IP packet encapsulation that again described gateway is issued.

45. according to the described base station of claim 44, it is characterized in that, also comprise:

The 4th receiver module, described first that is used for the described UE transmission of reception successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE; Described first that perhaps is used for described the 2nd UE transmission of reception successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE.

46. according to the described base station of claim 42, it is characterized in that, described first package module is used for resetting described first when successfully not sending to the PDCP sequence number PDCP packet and subsequent P DCP packet of described the 2nd UE at a described UE, and the IP allocation of packets PDCP sequence number that begins to issue for described gateway with sequence number 0 is encapsulated as the PDCP packet again with the IP packet that described gateway is issued.

47. according to the described base station of claim 42, it is characterized in that, also comprise:

Corresponding relation between second logging modle, the PDCP sequence number that is used for the PDCP packet that the described UE of record sends and the IP sequence number of the IP packet of the PDCP packet of described UE transmission;

It is the PDCP sequence number of the IP allocation of packets correspondence that issues of described gateway that described first package module is used for according to described corresponding relation, is encapsulated as the PDCP packet again with the IP packet that described gateway is issued.

48. according to the described base station of claim 42, it is characterized in that described the 3rd receiver module be used for to receive also that a described UE sends, and described first successfully do not send to the PDCP packet of described the 2nd UE and follow-uply sent to described the 2nd UE but successfully do not send to the PDCP sequence number of the PDCP packet of described the 2nd UE; Described first package module be used for will described UE transmission described first successfully do not send to described the 2nd UE the PDCP packet with follow-up to described the 2nd UE sent but the PDCP sequence number that successfully do not send to the PDCP packet of described the 2nd UE be encapsulated in described first successfully do not send to described the 2nd UE the PDCP packet and follow-up sent but successfully do not sent in the IP packet of PDCP packet of described the 2nd UE to described the 2nd UE send to described gateway, and receive the IP packet that comprises the PDCP sequence number that described gateway issues, the entrained PDCP sequence number of the IP packet that carries the PDCP sequence number that issues according to described gateway then, each IP allocation of packets PDCP sequence number for described gateway issues is encapsulated as the PDCP packet again with the IP packet that described gateway is issued.

49. a base station is characterized in that, comprising:

50. according to the described base station of claim 49, it is characterized in that, also comprise:

The reduction statistical module, be used for will described UE transmission packet be reduced to the Internet protocol IP packet, and add up flow between a described UE and described the 2nd UE according to the IP packet that restores.

51. a user equipment (UE) is characterized in that, comprising:

52. according to the described UE of claim 51, it is characterized in that, also comprise:

The tenth receiver module is used for receiving the PDCP packet that described base station is returned; Wherein, the PDCP packet that returns of described base station is the PDCP packet that described base station does not send to gateway as yet; Perhaps, to be described base station reduce the PDCP packet that generates according to the corresponding relation of record to all or part of PDCP packet that is packaged into and does not send to as yet described the 2nd UE again to the PDCP packet that returns of described base station.

53. according to claim 51 or 52 described UE, it is characterized in that, also comprise:

The 12 receiver module is used for receiving described first of notifying described base station and does not successfully send to the PDCP sequence number of the PDCP packet of described the 2nd UE.

54., it is characterized in that described the tenth receiver module also is used for receiving the PDCP sequence number of the PDCP packet that returns described base station when receiving the PDCP packet that returns described base station according to the described UE of claim 52.

55. according to the described UE of claim 54, it is characterized in that, described the 13 sending module is for the PDCP sequence number of the PDCP packet that returns according to described base station, upgrade described first and successfully do not send to the PDCP packet and PDCP sequence number subsequent P DCP packet of described the 2nd UE, the PDCP packet after will upgrading then sends to described the 2nd UE with the D2D pattern.

56. a base station is characterized in that, comprising:

57. according to the described base station of claim 56, it is characterized in that, described second package module is for the IP sequence number of the IP packet that issues according to described gateway, obtain the PDCP packet of the IP packet correspondence that the described gateway that has described IP sequence number issues, IP packet with the PDCP serial number assignment of the PDCP packet that obtains issues for described gateway is packaged into the PDCP packet again with the IP packet that described gateway is issued.

58. according to claim 56 or 57 described base stations, it is characterized in that, also comprise:

Judge module is used for the D2D ability information that reports according to a described UE and described the 2nd UE, judges whether a described UE and described the 2nd UE support the D2D pattern simultaneously;

The 3rd logging modle, be used in the judged result of described judge module when being, record the corresponding relation between the IP sequence number of the PDCP sequence number of the IP sequence number of the IP packet in the PDCP packet of PDCP sequence number, described UE transmission of the PDCP packet that a described UE sends, the described PDCP packet that is packaged into again and the IP packet in the described PDCP packet that is packaged into again;

The IP allocation of packets PDCP sequence number that described corresponding relation is used to described gateway to issue by described second package module.

59. according to claim 56 or 57 described base stations, it is characterized in that, also comprise:

The 16 sending module is used for the PDCP packet that does not send to described gateway as yet that a described UE sends is returned to a described UE.

60. according to claim 56 or 57 described base stations, it is characterized in that, also comprise:

The 17 sending module is used for all or part of described PDCP packet that is packaged into and does not send to as yet described the 2nd UE is again reduced, and the PDCP packet that restores is sent to described the 2nd UE or returns to a described UE.

61. according to the described base station of claim 56, it is characterized in that, also comprise:

The 19 sending module is used for notifying described first successfully not send to the PDCP sequence number of the PDCP packet of described the 2nd UE to a described UE.

62., it is characterized in that described the 16 sending module also is used for when returning the PDCP packet to a described UE according to the described base station of claim 59, the PDCP sequence number of the PDCP packet that returns sent to a described UE.

63. according to the described base station of claim 58, it is characterized in that, also comprise:

The 20 sending module is used for sending described corresponding relation to described the 2nd UE, upgrades the PDCP sequence number of the PDCP packet of the successful described base station transmission that receives to notify described the 2nd UE according to described corresponding relation.

64. a gateway is characterized in that, comprising:

65. according to the described gateway of claim 64, it is characterized in that, also comprise:

The 19 receiver module is for the sign of a described UE who receives the transmission of described base station and the sign of described the 2nd UE;

Described the 18 receiver module is used for according to the sign of a described UE and the sign of described the 2nd UE, in the IP packet that described base station sends, identify the IP packet that is sent to described the 2nd UE by a described UE, and record receives the order that is sent to the IP packet of described the 2nd UE by a described UE.