CN101998547A - Data forwarding method, base station and relay station - Google Patents

Abstract

The invention discloses a data forwarding method, a base station and a relay station. The data forwarding method includes: receiving a handover command message sent by a mobility management entity, where the handover command message carries a user equipment identifier; establishing a forwarding link corresponding to the user equipment identifier Transfer to the data channel; send a connection reconfiguration message to the relay station, and the connection reconfiguration message carries the channel identification corresponding to the forwarding data channel, so that the relay station can send the data packet of the user equipment through the forwarding data channel corresponding to the channel identification; receive The data packet sent by the relay station sends the data packet to the target base station. The data forwarding method provided by the embodiment of the present invention can be used in a relay scenario to implement lossless handover of a user equipment from a relay station to a target base station, thereby improving service quality of a communication system in a relay scenario.

Description

Data forwarding method, base station and relay station

technical field

The invention relates to the technical field of mobile communication, in particular to a data forwarding method, a base station and a relay station.

Background technique

In the long-term evolution (LTE, Long Term Evolving) system, when the signal quality of the cell where the user equipment (UE, UserEquipment) currently resides decreases, or the signal quality of an adjacent cell becomes better, the user equipment will switch, that is, the user equipment The cell where the source base station is located is handed over to the cell where the target base station is located. If the user equipment is performing data services before the handover, it is necessary to ensure that the data packets of the user equipment are not lost during the handover process, that is, the data packets buffered in the source base station and the user equipment has not yet been confirmed to be received by the source base station must be forwarded to the source base station. Go to the target base station. After the user equipment accesses at the target base station, the target base station sends it to the user equipment.

The handover process in the LTE system mainly includes the following steps: the mobile management entity (MME, Mobility Management Equipment) receives the handover request sent by the source base station, and sends a handover request to the target base station according to the handover request; the target base station receives the handover request, and then sends it to the MME Handover request response; the mobile management entity receives the handover request response of the target base station, and establishes a data forwarding tunnel with the serving gateway (ServicingGate); the mobile management entity sends a handover command message to the source base station, and the source base station will need to forward the status of the data packet The report is sent to the mobility management entity, and the data packet to be forwarded is sent to the service gateway through the data forwarding tunnel; the mobility management entity forwards the received status report to the target base station, and the service gateway forwards the received data packet to the target base station ; The target base station sends the data packets not received by the user equipment to the user equipment according to the status report.

In the process of researching the prior art, the inventor found that in the relay scenario, a wireless interface is used between the relay station and the source base station providing services for the relay station, and there is no wired channel for transferring data packets that need to be forwarded between the relay station and the source base station , the relay station cannot send the data packet that needs to be forwarded to the target base station, resulting in the loss of the data packet of the user equipment, thereby reducing the service quality of the communication system.

Contents of the invention

The present invention provides a data forwarding method, a base station and a relay station capable of sending a data packet that needs to be forwarded from a relay station to a target base station in a relay scenario.

The data forwarding method provided by the embodiment of the present invention includes: receiving a handover command message sent by a mobility management entity, where the handover command message carries a user equipment identifier; establishing a forwarding data channel corresponding to the user equipment identifier; sending a connection reconnection to the relay station The channel identifier corresponding to the forwarding data channel is carried in the connection reconfiguration message, so that the relay station can send the data packet of the user equipment through the forwarding data channel corresponding to the channel identifier; when receiving the data packet sent by the relay station, the data packet sent to the target base station.

The embodiment of the present invention also provides a data forwarding method, including: receiving the connection reconfiguration message sent by the source base station, parsing the connection reconfiguration message, and obtaining the channel identifier of the forwarded data channel; passing the data packet of the user equipment through the channel identifier The corresponding forwarded data channel is sent to the source base station.

The embodiment of the present invention also provides a base station, including: a first receiving unit, configured to receive a handover command message sent by a mobility management entity, where the handover command message carries a user equipment identifier; a channel establishment unit, configured to establish a The corresponding forwarding data channel; the reconfiguration message sending unit is used to send a connection reconfiguration message to the relay station, and the connection reconfiguration message carries the channel identification corresponding to the forwarding data channel, so that the relay station can pass the forwarding data corresponding to the channel identification. The data channel is used to send the data packet of the user equipment; the second receiving unit is used to receive the data packet sent by the relay station; the data forwarding unit is used to send the data packet to the target base station.

An embodiment of the present invention also provides a relay station, including: a reconfiguration message receiving unit, configured to receive a connection reconfiguration message sent by a source base station; a reconfiguration message analysis unit, configured to parse a connection reconfiguration message to obtain a channel of a forwarded data channel Identification: a data packet sending unit, configured to send the data packet of the user equipment to the source base station through the forwarding data channel corresponding to the channel identification.

In the embodiment of the present invention, the source base station establishes a forwarding data channel, so that the relay station can send the data packet that needs to be forwarded to the source base station through the forwarding data channel, and the source base station can forward the data packet to the target base station, thereby completing Data forwarding of user equipment. An embodiment of the present invention provides a data forwarding method in a relay scenario, which can forward the forwarded data of the user equipment from the relay station to the target base station, and then receive the forwarded data from the target base station when the user equipment is handed over to the target base station. data. Compared with the prior art, the embodiment of the present invention can realize the lossless handover of the user equipment from the relay station to the target base station, thereby improving the service quality of the communication system in the relay scenario.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flow chart of the first embodiment of the data forwarding method in the embodiment of the present invention;

FIG. 2 is a flowchart of a method for establishing a forwarding data channel corresponding to a user equipment identifier in an embodiment of the present invention;

Fig. 3 is a flow chart of the second embodiment of the data forwarding method in the embodiment of the present invention;

Fig. 4 is a flow chart of the first embodiment of the method for the relay station to send the status data packet according to the embodiment of the present invention;

FIG. 5 is a flowchart of a second embodiment of a method for a relay station to send a status data packet according to an embodiment of the present invention;

6 is a schematic diagram of a source base station sending data to a target base station through a relay station in an embodiment of the present invention;

FIG. 7 is a schematic diagram of the source base station obtaining data packets not received by the user equipment in the embodiment of the present invention;

Fig. 8 is a flowchart of a method for sending a data packet by a source base station in an embodiment of the present invention

FIG. 9 is a schematic diagram of a base station in an embodiment of the present invention;

FIG. 10 is a schematic diagram of a channel establishment unit in a base station embodiment of the present invention;

Fig. 11 is a schematic diagram of an embodiment of a relay station in an embodiment of the present invention.

Detailed ways

The invention provides a data forwarding method, a base station and a relay station. In order to better understand the technical solutions of the present invention, the embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to FIG. 1 , FIG. 1 is a flowchart of a first embodiment of a data forwarding method provided by an embodiment of the present invention.

In the embodiment of the present invention, the user equipment needs to be handed over from the relay base station to the target base station, and the source base station provides services for the relay station. The user equipment is performing data services before the handover, so the data packets of the user equipment need to be forwarded to the target base station. The data forwarding method in the embodiment of the present invention may include:

Step A1. Receive a handover command message sent by a mobility management entity, where the handover command message carries a user equipment identifier.

In the embodiment of the present invention, the source base station may receive the handover command message sent by the mobility management entity, and at this time, the mobility management entity has completed the handover preparation.

Step A2, establishing a forwarding data channel corresponding to the user equipment identifier.

In the embodiment of the present invention, the source base station establishes a data forwarding channel corresponding to the user equipment identifier, and the source base station allocates resources for the forwarding data channel, and the forwarding data channel can be used to transmit data packets of the user equipment.

Step A3: Send a connection reconfiguration message to the relay station, and the connection reconfiguration message carries the channel identifier corresponding to the forwarding data channel, so that the relay station can send the data packet of the user equipment through the forwarding data channel corresponding to the channel identifier.

In the embodiment of the present invention, the source base station may send a connection reconfiguration message to the relay station after the forwarding data channel is established, and the connection reconfiguration message carries the channel identifier corresponding to the forwarding data channel. Wherein, the channel identifier may include a bearer identifier and a channel direction.

After receiving the connection reconfiguration message, the relay station can send the data packet of the user equipment to the source base station through the forwarding data channel corresponding to the channel identifier.

Step A4, receiving the data packet sent by the relay station, and sending the data packet to the target base station.

In the embodiment of the present invention, the source base station receives the data packet sent by the relay station through the forwarding data channel, and sends the data packet to the target base station. In the embodiment of the present invention, after the user equipment is handed over to the target base station, the target base station can send the received data packet to the user equipment, so that the user equipment can continue to perform data services, and the data services of the user equipment will not be interrupted.

In the embodiment of the present invention, the source base station establishes a forwarding data channel, so that the relay station can send the data packet that needs to be forwarded to the source base station through the forwarding data channel, and the source base station can forward the data packet to the target base station, thereby completing Data forwarding of user equipment. Compared with the prior art, the embodiment of the present invention provides a data forwarding method in a relay scenario, which can forward the forwarded data of the user equipment from the relay station to the target base station, and then when the user equipment is handed over to the target base station , receiving forwarded data from the target base station. The embodiment of the present invention can realize the lossless handover of the user equipment from the relay station to the target base station, thereby improving the service quality of the communication system in the relay scenario.

Referring to FIG. 2 , FIG. 2 is a flowchart of a method for establishing a forwarding data channel corresponding to a user equipment identifier in an embodiment of the present invention.

In the embodiment of the present invention, the source base station may establish a forwarding data channel corresponding to the user equipment identifier after receiving the handover command message sent by the mobility management entity, which may specifically include:

Step B1, judging whether there is a bidirectional bearer in the user equipment corresponding to the user equipment identifier.

Specifically, the source base station may determine whether the user equipment corresponding to the user equipment identifier has a bidirectional bearer, if yes, perform step B2, and if not, perform step B3. If the user equipment has data in the uplink direction and data in the downlink direction, it means that the user equipment has bidirectional bearers; if the user equipment only has data in the downlink direction, it means that the user equipment only has unidirectional bearers.

Step B2, configuring the forwarding data channel in the uplink bearer of the bidirectional bearer.

In the embodiment of the present invention, the source base station can configure the forwarding data channel between the relay station and the source base station in the uplink bearer of the bidirectional bearer according to the handover command message when the user equipment has a bidirectional bearer. At this time, in the uplink bearer Including uplink data channel and forwarding data channel.

Step B3, establishing a forwarding data channel in the bearer corresponding to the user equipment.

In the embodiment of the present invention, the source base station may establish a forwarding data channel in the bearer corresponding to the user equipment in the case that the user equipment does not have a bidirectional bearer, that is, establish an uplink data channel in the bearer.

In the embodiment of the present invention, a forwarding data channel can be established for the user equipment for different application scenarios, so that a data packet of the user equipment can be sent to the source base station through the forwarding data channel.

Referring to FIG. 3 , FIG. 3 is a flowchart of a second embodiment of a data forwarding method provided by an embodiment of the present invention.

The embodiment of the present invention describes the data forwarding method from the perspective of the relay station. The data forwarding method in the embodiment of the present invention mainly includes:

Step C1: Receive the connection reconfiguration message sent by the source base station, and analyze the connection reconfiguration message to obtain the channel identifier of the forwarded data channel.

Specifically, the relay station receives the connection reconfiguration message sent by the source base station, and parses the connection reconfiguration message to obtain the channel identifier of the forwarded data channel. Wherein, the channel identifier may include a bearer identifier and a channel direction.

Step C2. Send the data packet of the user equipment to the source base station through the forwarding data channel corresponding to the channel identifier.

In the embodiment of the present invention, the relay station sends the data packet of the user equipment to the source base station through the forwarding data channel. Specifically, the relay station may put the data packet on the forwarding data channel corresponding to the channel identifier, and send it to the source base station.

In the embodiment of the present invention, the relay station receives the connection reconfiguration message sent by the source base station, and uses the forwarding data channel to send the data packet of the user equipment according to the connection reconfiguration message. The embodiment of the present invention provides a The data forwarding method can realize the lossless handover of the user equipment from the relay station to the target base station, thereby improving the service quality of the communication system in the relay scenario.

In the embodiment of the present invention, when there is a bidirectional bearer in the user equipment, the data packets of the user equipment include forwarding data packets and uplink data packets, and the forwarding data packets and uplink data packets are sent using the forwarding data channel. When sending the data packet, the relay station can add a data packet identifier to the header of the data packet, so that the source base station can distinguish the forwarded data packet from the uplink data packet. The format of the data packet to which the data packet identifier is added may be as shown in Table 1.

Table 1

Wherein, D/C indicates whether the current data packet is a data unit or a control unit. In the embodiment of the present invention, it is a data unit, R is a reserved bit, and E is an extension bit. In the embodiment of the present invention, the extension bit is a data packet identifier. Packet Data Convergence Protocol Serial Number (PDCP SN, Packet Data Convergence Protocol Serial Number) is the serial number used by the data packet on the interface (Un interface) between the relay station and the source base station. The serial number, Data is the data part. In the embodiment of the present invention, when E is 0, the data packet is identified as an uplink data packet, and when E is 1, the data packet is identified as a forwarded data packet.

In the embodiment of the present invention, when the source base station receives the data packet sent by the relay station, it can judge whether the received data packet is an uplink data packet according to the data packet identifier. If the source base station judges that the forwarded data packet is not an uplink data packet but a forwarded data packet, for example, when the extension bit E is 1, it sends the data packet to the target base station. Otherwise, the data packet will not be sent to the target base station, and the uplink data packet will be sent to the core network. In the embodiments of the present invention, by judging whether the received data packets are forwarded data packets, forwarding of the uplink data packets of the user equipment can be avoided, thereby reducing the amount of forwarded data and saving network resources.

In the embodiment of the present invention, the relay station can also add the sequence number of the data packet on the interface (Uu interface) between the relay station and the user equipment at the head of the data packet that needs to be sent to the source base station, so that the target base station can send the user equipment The data packets are sent to the user equipment in sequence, reducing the probability of data packet errors. In this embodiment of the present invention, the format of the data packet may be as shown in Table 2.

Table 2

Among them, the extension bit E is 1, indicating that the data packet is a forwarded data packet; PDCP SN indicates the sequence number used by the data packet on the wireless interface (Un interface); (Uu)PDCP SN indicates that the data packet is on the wireless interface (Uu) The serial number used. PDCP SN(cont.) indicates the specific serial number on the Un interface, (Uu)PDCP SN(cont.) indicates the specific serial number on the Uu interface, and Padding is the padding bit.

In addition, the format of the data packet may also be as shown in Table 3. At this time, the extension bit is 1, indicating that the sequence number used by the data packet on the Uu interface is followed by the extension bit.

table 3

Referring to FIG. 4, FIG. 4 is a flow chart of the first embodiment of the method for the relay station to send the status data packet according to the embodiment of the present invention.

In the embodiment of the present invention, the relay station may also send a status data packet to the source base station between performing steps C1 and C2, and the process for the relay station to send the status data packet to the source base station may include:

Step D1, receiving a status report of the user equipment, where the status report includes receiving status information of the forwarded data packet.

The relay station can receive the status report of the user equipment, and analyze the status report to obtain the receiving status information of the forwarded data packet. The receiving status information includes the serial number and receiving status of the forwarded data packet on the Un interface. The receiving status information indicates the receiving status of the forwarded data packet corresponding to the serial number. The receiving status may include received and unreceived Two states.

Step D2, sending a first status data packet to the source base station, where the first status data packet carries receiving status information.

Specifically, the relay station may create a first status data packet, where the first status data packet carries receiving status information. Wherein, the receiving state of the forwarded data packet can be expressed in the form of a bitmap (bitmap), for example, 1 indicates that it has been received, and 0 indicates that it has not been received. The specific format in the first state data packet may be as shown in Table 4.

Table 4

Among them, PDU Type indicates that the data packet is a status data packet, FMS (First Missing Sequence Number) indicates the sequence number of the first non-continuously received data packet, and the first bit indicates a data packet whose sequence number is equal to (FMS+1) The receiving status of the second bit indicates the receiving status of the data packet whose sequence number is equal to (FMS+2). The state data packet provided by the embodiment of the present invention can precisely control the receiving state of the forwarded data packet, so that the data packet not received by the user equipment is sent to the target base station, and the lossless handover of the user equipment from the relay station to the target base station is realized.

In addition, the specific format in the first state data packet may also be as shown in Table 5.

table 5

In the embodiment of the present invention, the first status data packet only includes the sequence number of the last continuous data packet acknowledged by the user equipment on the Un interface.

In the embodiment of the present invention, the source base station may receive the first status data packet sent by the relay station between sending the connection reconfiguration message to the relay station (step A3 above) and receiving the data packet sent by the relay station (step A4 above). The first state data packet carries receiving state information of the forwarded data packet. Wherein, the receiving status information includes the sequence number and receiving status of the forwarded data packet on the Un interface.

When sending the data packet to the target base station, the source base station sends the forwarded data packet not received by the user equipment to the target base station according to the receiving state information. Wherein, the source base station can obtain the serial number of the forwarded data packet not received by the user equipment on the Un interface according to the state information, and then send the data packet corresponding to the serial number to the target base station, and the target base station can receive the data packet not received by the user equipment. received forwarded packets.

For example, the format of the first state data packet received by the source base station may be as shown in Table 5. The first state data packet only contains the sequence number of the last continuous data packet confirmed by the user equipment on the Un interface, and the source base station judges All data packets after the sequence number are not received by the user equipment, and the source base station sends all data packets after the sequence number to the target base station.

In the embodiment of the present invention, the source base station sends the forwarded data packets not received by the user equipment to the target base station according to the receiving state information, so as to avoid forwarding the data packets received by the user equipment, thereby reducing the amount of forwarded data , saving network resources.

Referring to FIG. 5 , FIG. 5 is a flowchart of a second embodiment of a method for a relay station to send a status data packet according to an embodiment of the present invention.

In the embodiment of the present invention, there are two or more bearers between the user equipment and the relay station, and one bearer exists between the relay station and the source base station, that is, two or more bearers between the user equipment and the relay station The data packet on the bearer is transmitted through a bearer between the relay station and the source base station, and one bearer on the Un interface of the user equipment corresponds to multiple bearers on the Uu interface. At this time, the sequence number of the forwarded data packet on the Un interface is different from the sequence number of the forwarded data packet on the Uu interface. The process for the relay station to send the status data packet may include:

Step E1, receiving a status report of the user equipment, where the status report carries the receiving status information of the forwarded data packet.

Specifically, the relay station may receive the status report of the user equipment, the status report carries the receiving status information of the forwarded data packet, and the receiving status information includes the sequence number of the forwarded data packet on the Un interface and the receiving status of the forwarded data packet , the receiving state may include two states: received and not received.

Step E2, sending a second status data packet to the source base station, where the second status data packet carries receiving status information and the sequence number of the forwarded data packet on the Uu interface.

Specifically, the relay station sends a second status data packet to the source base station, and the second status data packet carries receiving status information and a sequence number of the forwarded data packet on the Uu interface. Wherein, the receiving state information includes the serial number of the forwarded data packet on the Un interface and the receiving state, and the relay station can obtain the serial number of the forwarded data packet on the Uu interface according to the serial number of the forwarded data packet on the Un interface.

In this embodiment of the present invention, the format of the second status data packet may be as shown in Table 6.

Table 6

In the embodiment of the present invention, after receiving the second status data packet sent by the relay station, the source base station can analyze the second status data packet to obtain the receiving status information of the forwarded data packet and the sequence number N1 of the forwarded data packet on the Uu interface. Wherein, the second status data packet carries receiving status information and a sequence number N1 of the forwarded data packet on the Uu interface.

The source base station may also send the forwarded data packet not received by the user equipment and the sequence number N1 of the data packet not received by the user equipment on the Uu interface to the target base station according to the receiving state information. Wherein, the source base station may send the status data packet carrying the sequence number N1 of the Uu interface to the target base station.

The target base station receives the forwarded data packet carrying the sequence number of the Uu interface, and identifies the received forwarded data packet according to the sequence number N1 of the Uu interface, so that when the user equipment is handed over to the target base station, the user equipment does not receive the forwarded data packet. The data packet is sent to the user device.

A specific scenario is given below to describe the usage method of the above-mentioned second status data packet.

Referring to FIG. 6, FIG. 6 is a schematic diagram of a source base station sending data to a target base station through a relay station in an embodiment of the present invention.

In the embodiment of the present invention, two bearers are used to transmit data packets between the user equipment and the relay station, namely RB1 and RB2, and one bearer is used between the relay station and the source base station to transmit data packets of the user equipment. As shown in the figure, the source base station receives a total of 11 data packets sent by two bearers, and the numbers of the data packets on the Un interface are from 0 to 10. The source base station sends the received data packet to the relay station through the bearer between the relay station and the source base station. After receiving the data packets of the user equipment, the relay station forwards these data packets to the user equipment through the bearer RB1 and the bearer RB2. Wherein, the data packet needs to be renumbered before being sent to the user equipment, that is, the serial number of the Uu interface is assigned to the data packet. The sequence number of the data packet on the Uu interface may be different from the sequence number of the data packet on the Un interface.

In the embodiment of the present invention, when the user equipment is handed over, the above 11 data packets need to be forwarded to the target base station, but during the forwarding process, it is not necessary to send all the 11 data packets to the target base station, only the user equipment needs to Packets not received are forwarded. In the embodiment of the present invention, the sequence numbers of the data packets to be forwarded on the bearer RB1 on the Uu interface are 1, 2 and 5 respectively.

In the second status data packet shown in FIG. 7 , 0 means not received, and 1 means received. The status data packet indicates that the sequence number of the first data packet received by the user equipment without connection is 1 on the Uu interface. The source base station obtains the sequence numbers 1, 2, and 5 of the data packets that need to be forwarded on the bearer RB1 on the Uu interface according to the status data packet, and then sends the forwarded data packets with the sequence numbers 1, 2, and 5 to the target base station.

In the embodiment of the present invention, if there is a bearer between the user equipment and the relay station, the bearer of the user equipment on the Un interface and the user equipment on the Uu interface are in one-to-one correspondence, and the same data packet is transmitted between the Un interface and the Uu interface. have the same sequence number, the status data packet sent by the relay station only needs to carry the sequence number of the forwarded data packet on the Uu interface.

Referring to FIG. 8 , FIG. 8 is a flowchart of a method for a source base station to send a data packet to a target base station in an embodiment of the present invention.

In the embodiment of the present invention, the handover command message received by the source base station may carry delay indication information, and the delay indication information may indicate path information of the data packet, such as delay time, forwarding path of the data packet, and the like. In the embodiment of the present invention, if the user equipment is handed over through the X2 interface, the handover command message received by the source base station is sent by the target base station, and the target base station can obtain the path information of the data packet; if the user equipment is handed over through the S1 interface, the source base station The received handover command message is sent by the mobility management entity, and the mobility management entity, as the upper-level network element of the source base station and the target base station, can obtain the path information of the data packet.

In the embodiment of the present invention, the process of the source base station sending the data packet to the target base station may include:

Step F1, judging whether the received data packet can reach the target base station within the remaining discarding time according to the delay indication information.

In the embodiment of the present invention, the data packet received by the source base station carries a discard time, that is, if the data packet cannot reach the user equipment within the discard time, the data packet is automatically discarded. The source base station judges whether the received data packet can reach the user equipment within the remaining discarding time according to the delay indication information, such as the forwarding path of the data packet. If it is determined that the data packet can reach the user equipment within the remaining discarding time, execute step F2; otherwise, execute step F3.

Step F2, sending the data packet to the target base station.

In the embodiment of the present invention, the source base station judges that the data packet can reach the user equipment within the remaining discarding time, and then sends the data packet to the target base station.

In the embodiment of the present invention, if the user equipment is handed over through the X2 interface, the source base station directly sends the data packet to the target base station. If the user equipment is handed over through the S1 interface, the source base station sends the data packet to the target base station through the serving gateway.

Step F3, giving up sending the data packet.

In the embodiment of the present invention, the source base station determines that the data packet will not reach the user equipment within the remaining discarding time, and then gives up sending the data packet. The source base station can drop the data packet or stop sending the data packet.

In the embodiment of the present invention, by judging whether the target base station can reach the user equipment within the remaining time of discarding, it is possible to give up sending the data packet when it is judged that the data packet will not reach the user equipment within the remaining time of discarding, so as to avoid sending the data packet to the target base station , the embodiment of the present invention can reduce the amount of forwarded data and save network resources.

Referring to FIG. 9, FIG. 9 is a schematic diagram of a base station provided by an embodiment of the present invention.

The base station provided by the embodiment of the present invention may include:

The first receiving unit 110 is configured to receive a handover command message sent by a mobility management entity, where the handover command message carries a user equipment identifier;

A channel establishing unit 120, configured to establish a forwarding data channel corresponding to the user equipment identifier;

The reconfiguration message sending unit 130 is configured to send a connection reconfiguration message to the relay station, where the connection reconfiguration message carries a channel identifier corresponding to the forwarded data channel, so that the relay station can send the connection through the forwarded data channel corresponding to the channel identifier. data packets of user equipment;

The second receiving unit 140 is configured to receive the data packet sent by the relay station;

The data forwarding unit 150 is configured to send the data packet to the target base station.

In the embodiment of the present invention, the base station may also include:

A forwarding judging unit 160, configured to judge whether the data packet is a forwarded data packet according to the data packet identifier of the data packet;

The first triggering unit 170 is configured to trigger the data forwarding unit 150 to send the forwarding data packet to the target base station when the forwarding judging unit 160 judges that the forwarding data packet is a forwarding data packet.

In the embodiment of the present invention, the base station may also include:

A discard judging unit 180, configured to judge whether the data packet can reach the target base station within the remaining time of discarding according to the delay indication information;

The second triggering unit 190 is configured to trigger the data forwarding unit 150 to send the data packet to the target base station when the discarding judging unit 180 judges that the data packet can reach the target base station within the remaining discarding time;

The data discarding unit 200 is configured to give up sending the data packet when the discarding judging unit 180 judges that the received data packet cannot reach the target base station within the remaining discarding time.

Referring to FIG. 10 , FIG. 10 is a schematic diagram of a channel establishment unit in a base station embodiment of the present invention.

In the base station embodiment of the present invention, the channel establishment unit 120 may include:

Bearer judging module 121, configured to judge whether there is a bidirectional bearer in the user equipment corresponding to the user equipment identifier;

The configuration module 122 is configured to configure the forwarding data channel in the uplink bearer of the bidirectional bearer when the bearer judging module 121 judges that the user equipment has a bidirectional bearer;

The establishment module 123 is configured to establish a forwarding data channel in the bearer corresponding to the user equipment when the bearer judging module 121 judges that there is no bidirectional bearer in the user equipment.

The base station embodiment provided by the embodiment of the present invention can be used in the foregoing corresponding first embodiment of the data forwarding method.

Referring to FIG. 11 , FIG. 11 is a schematic diagram of an embodiment of a relay station provided by an embodiment of the present invention.

In the embodiment of the present invention, the relay station may include:

A reconfiguration message receiving unit 610, configured to receive a connection reconfiguration message sent by the source base station;

The reconfiguration message parsing unit 620 is configured to parse the connection reconfiguration message to obtain the channel identifier of the forwarded data channel:

The data packet sending unit 630 is configured to send the data packet of the user equipment to the source base station through the forwarding data channel corresponding to the channel identifier.

The relay station in the embodiment of the present invention may also include:

A status report receiving unit 640, configured to receive a status report of the user equipment, where the status report includes receiving status information of the forwarded data packet;

The status data sending unit 650 is configured to send a first status data packet to the source base station, where the first status data packet carries receiving status information of the forwarded data packet.

The relay station provided in this embodiment of the present invention can be used in the aforementioned second embodiment of the corresponding data forwarding method.

It should be noted that, since the information exchange and execution process between the units in the above-mentioned device are based on the same concept as the method embodiment of the present invention, the specific content can refer to the description in the method embodiment of the present invention, and will not be repeated here. repeat.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, and can also be realized by means of software and a necessary general hardware platform. Based on this understanding, the technology of the present invention The solution can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a read-only CD, U disk, mobile hard disk, etc.), and includes several instructions to make a computer device ( It may be a personal computer, a receiving end, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

The data forwarding method, base station and relay station provided by the embodiment of the present invention have been introduced in detail above. For those of ordinary skill in the art, according to the idea of the embodiment of the present invention, there will be changes in the specific implementation and application scope , the contents of this specification should not be construed as limiting the present invention.

Claims (17)

1. a data forwarding method is characterized in that, comprising:

Receive the switching command message that mobile management entity sends, carry customer equipment identification in the described switching command message;

Set up and the corresponding forwarding data passage of described customer equipment identification;

Send to connect reallocation message to relay station, carry the gap marker of described forwarding data passage correspondence in the described connection reallocation message, so that relay station is by sending the packet of described subscriber equipment with the corresponding forwarding data passage of described gap marker;

Receive the described packet that relay station sends, described packet is sent to target BS.

2. method according to claim 1 is characterized in that, described foundation and described customer equipment identification with respect to the forwarding data passage, comprising:

Judge with the corresponding subscriber equipment of described customer equipment identification and whether have two-way carrying;

If then in the up carrying of described two-way carrying, dispose the forwarding data passage;

If not, then with the corresponding carrying of described subscriber equipment in set up the forwarding data passage.

3. method according to claim 2 is characterized in that, described described packet is sent to target BS, comprising:

When described packet is the forwarding data bag, described forwarding data bag is sent to target BS.

4. method according to claim 1 is characterized in that, sends between the described packet that connects reallocation message and the transmission of described reception relay station to relay station described, comprising:

Receive first state data packets that relay station sends, carry the receiving status information of described packet in described first state data packets;

Described packet is sent to target BS, comprising:

According to described first state data packets packet that described subscriber equipment does not receive is sent to target BS.

5. method according to claim 1 is characterized in that, sends between the described packet that connects reallocation message and the transmission of described reception relay station to relay station described, comprising:

Receive second state data packets that relay station sends, carry the receiving status information of described packet and described packet sequence number in described second state data packets at the Uu interface;

Described packet is sent to target BS, comprising:

According to described second state data packets packet and the described packet that does not receive that described subscriber equipment does not receive sent to target BS at the sequence number of Uu interface.

6. method according to claim 1 is characterized in that, carries the delay indication information in the described switching command message,

Described described packet is sent to target BS, comprising:

Judge that according to described delay indication information whether described packet can arrive subscriber equipment abandoning in remaining time;

If then described packet is sent to target BS;

If not, then abandon sending described packet.

7. a data forwarding method is characterized in that, comprising:

The connection reallocation message that the reception sources base station sends is resolved described connection reallocation message, obtains the gap marker of forwarding data passage;

With the packet of subscriber equipment by sending to described source base station with the corresponding forwarding data passage of described gap marker.

8. method according to claim 7 is characterized in that:

The head of described packet carries package identification, and described package identification is used to identify the type of described packet.

9. according to claim 7 or 8 described methods, it is characterized in that:

The head of described packet also carries the sequence number of described packet on the Un interface.

10. method according to claim 7 is characterized in that, the connection reallocation message that sends in described reception sources base station and described with subscriber equipment packet by and the corresponding forwarding data passage of described gap marker send between the source base station, also comprise:

Receive the status report of subscriber equipment, comprise the receiving status information of forwarding data bag in the described status report;

Send first state data packets to source base station, carry described receiving status information in described first state data packets.

11. method according to claim 7 is characterized in that, the connection reallocation message that sends in described reception sources base station and described with subscriber equipment packet by and the corresponding forwarding data passage of described gap marker send between the source base station, also comprise:

Receive the status report of subscriber equipment, comprise the receiving status information of forwarding data bag in the described status report;

Send second state data packets to source base station, carry the sequence number that described receiving status information and described forwarding data wrap in the Uu interface in described second state data packets.

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

First receiving element is used to receive the switching command message that mobile management entity sends, and carries customer equipment identification in the described switching command message;

Passage is set up the unit, is used for setting up and the corresponding forwarding data passage of described customer equipment identification;

The reallocation message transmitting element, be used for sending the connection reallocation message to relay station, carry the gap marker of described forwarding data passage correspondence in the described connection reallocation message, so that relay station is by sending the packet of described subscriber equipment with the corresponding forwarding data passage of described gap marker;

Second receiving element is used to receive the described packet that described relay station sends;

The data forwarding unit is used for described packet is sent to target BS.

13. base station according to claim 12 is characterized in that, described passage is set up the unit and is comprised:

The carrying judge module is used for judging with the corresponding subscriber equipment of described customer equipment identification whether have two-way carrying;

Configuration module is used for when described carrying judge module judges that there is two-way carrying in described subscriber equipment, configuration forwarding data passage in the up carrying of described two-way carrying;

Set up module, be used for when described carrying judge module judges that there is not two-way carrying in described subscriber equipment, with the corresponding carrying of described subscriber equipment in set up the forwarding data passage.

14. base station according to claim 12 is characterized in that, also comprises:

The preceding judging unit that changes is used for judging according to the package identification of described packet whether described packet is the forwarding data bag;

First trigger element when being used for before described changeing the described packet of judgment unit judges and being the forwarding data bag, triggers described data forwarding unit described forwarding data bag is sent to target BS.

15. base station according to claim 12 is characterized in that, carries the delay indication information in the described switching command message; Described base station also comprises:

Abandon judging unit, be used for judging that according to described delay indication information whether described packet can arrive target BS abandoning in remaining time;

Second trigger element is used for can triggering described data forwarding unit described packet is sent to target BS abandoning in remaining time when arriving target BS at the described described packet of judgment unit judges that abandons;

The data discarding unit is used for cannot abandoning sending described packet abandoning in remaining time when arriving target BS at the described described packet of judgment unit judges that abandons.

16. a relay station is characterized in that, comprising:

The reallocation message receiving element is used for the connection reallocation message that the reception sources base station sends;

The reallocation message resolution unit is used to resolve the gap marker that described connection reallocation message obtains the forwarding data passage:

The packet transmitting element is used for packet with subscriber equipment by sending to source base station with the corresponding forwarding data passage of described gap marker.

17. relay station according to claim 16 is characterized in that, also comprises:

The status report receiving element is used to receive the status report of subscriber equipment, comprises the receiving status information of forwarding data bag in the described status report;

The status data transmitting element is used for sending first state data packets to source base station, carries the receiving status information of described forwarding data bag in described first state data packets.

Images