CN101867872A - Method and system for forwarding data to relay node through base station - Google Patents
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Abstract
The embodiment of the invention discloses a method for forwarding data to a relay node RN through a base station eNB, which comprises that: a core network equipment finds out the RN participating current service data transmission and the IP address of the RN, packs the current service data into a data packet containing the IP address and a data packet not containing the IP address, and sends the two data packets to the eNB; and the eNB judges whether the received data packet contains the IP address, if the received data packet contains the IP address, the eNB transmits the received data packet to the corresponding RN. A system comprises the core network equipment, the eNB and the RN. Through the method and the system, the data can be forwarded to the RN by the eNB.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and a system for forwarding data to a relay node through a base station.
Background
In a conventional cellular mobile communication system, a radio access network typically includes a plurality of base stations, each of which is responsible for controlling one or more cells, and different cells are connected to each other to achieve continuous coverage. In order to obtain higher capacity in a unit area and improve the experience of cell edge users, a cell splitting method is generally adopted, one cell is divided into a plurality of smaller cells, and more base stations are introduced for control.
Future mobile communication systems, such as the Beyond three Generation (B3G) system or the long term evolution advanced (LTE-a) system, need to provide higher peak data rates and cell throughput, and therefore need to occupy larger bandwidths. Currently, there is little unallocated bandwidth below 2G Hz, and some or all of the bandwidth required by the future mobile communication system can only be found in higher frequency bands, for example, in frequency bands above 3G Hz. The higher the frequency band is, the faster the radio wave propagation attenuation is, and the shorter the transmission distance is, so under the same coverage area, to ensure continuous coverage, more base stations need to be arranged, and since the base stations usually have higher manufacturing cost, the network deployment cost is undoubtedly increased.
The Relay device (Relay) only performs simple processing on data, and has a simpler structure and lower cost than the BS. Therefore, in order to solve the problem of network deployment cost, various manufacturers and standardization organizations have started to research the introduction of RS into cellular systems to expand the coverage.
Fig. 1 is a schematic diagram of an access network composition of a cellular system incorporating RNs.
As shown in fig. 1, the BS is a base station, RS1, RS2, and RS3 are all Relay devices (Relay), and the largest circle in fig. 1 represents the cell coverage of the BS. RS1 located at the edge of the BS coverage is used to extend the cell coverage, RS2 located in the middle of the cell is used to increase the system capacity, and RS3 located on high-rise buildings within the cell coverage is used to improve the communication quality of User Equipments (UEs) located in the shadow area.
In fig. 1, each BS may govern one or more RSs, and when sending data to an RS, a core network device needs to be forwarded by the BS, but the prior art does not provide a detailed scheme for how the BS specifically forwards data to the RS.
With the development of mobile communication technology, Multicast Broadcast (MBMS) services will also be introduced into future mobile communication systems. In order to implement the MBMS service, two additional network elements are required to be added in the mobile communication system, which are an MBMS gateway (MBMS-GW) and a Multi-cell Multi-broadcast synchronization Entity (MCE), respectively.
Fig. 2 is a schematic diagram of a network for implementing an MBMS service in a mobile communication system.
As shown in fig. 2, the MBMS-GW and eNB communicate via an M1 interface, the eNB and MCE communicate via an M2 interface, and the MCE and MBMS-GW communicate via an M3 interface, where the M1 interface is a user plane interface (user plane interface), M2 is an E-UTRAN internal control plane interface (E-UTRAN internal control plane interface), and M3 is a control plane interface (control plane interface between E-UTRAN and EPC) between E-UTRAN and core network (EPC).
The use of a multicast single frequency network (MBSFN) to send MBMS service data packets is an important attribute of MBMS services, but all base stations sending MBMS service data packets need to be synchronized, that is, MBMS service data packets are sent to UEs subordinate thereto synchronously, so as to ensure that the UEs receive the data packets at the same time.
In order to achieve synchronization between the respective base stations, a synchronization protocol of an MBMS service is introduced in an eNB and an MBMS-GW of a current mobile communication system, for example, an LTE system. If the RS is introduced in a future mobile communication system and the RS also needs to participate in the transmission of MBMS service data packets, the synchronization protocol also needs to be introduced in the RS to achieve synchronization with all base stations and RSs participating in the transmission of MBMS service data packets.
Fig. 3 is a structure diagram of a user plane for implementing MBMS service synchronization in a mobile communication system.
In fig. 3, the MBMS-GW controls each eNB with a SYNC protocol through the SYNC protocol, so as to implement that each eNB synchronously forwards an MBMS service data packet from a network side to the UE. The MBMS-GW sends synchronization messages to all the eNBs, and all the eNBs achieve synchronization according to the received synchronization messages. If the RN is to be introduced into the MBSFN, the eNB is further required to forward the synchronization message to the RN, and a detailed scheme for how to forward the synchronization message is not given in the prior art.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method and a system for forwarding data to a Relay Node (RN) through a base station, which are applied in a mobile communication system provided with the RN, so as to provide a detailed technical solution for the base station and the RN to forward the same data.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is specifically realized as follows:
a method of forwarding data by a base station, eNB, the method comprising:
the core network equipment acquires a relay node RN participating in current service data transmission and an IP address of the RN, packs the current service data into a data packet containing the IP address and a data packet not containing the IP address, sends the two data packets to the eNB, and the eNB judges whether the received data packet contains the IP address or not, and if so, transmits the received data packet to the corresponding RN.
A method of forwarding data by a base station, eNB, the method comprising:
and the core network equipment sends the current service data packet to the eNB, the eNB judges whether the RN governed by the eNB participates in the current service data transmission, and if so, the received data packet is forwarded to the RN participating in the current service data transmission.
A system for forwarding data through an eNB comprises a core network device, the eNB and an RN;
the core network equipment acquires a relay node RN participating in current service data transmission and an IP address of the RN, packs the current service data into a data packet containing the IP address and a data packet not containing the IP address, and sends the two data packets to the eNB;
the eNB judges whether the received data packet contains the IP address, and if so, transmits the received data packet to the corresponding RN;
and the RN receives the data packet sent by the eNB.
A system for forwarding data to RN through eNB comprises core network equipment, eNB and RN;
the core network equipment sends the current service data packet to the eNB;
the eNB judges whether the RN governed by the eNB participates in current service data transmission, and if so, forwards the received data packet to the RN participating in the current service data transmission;
and the RN receives the data packet sent by the eNB.
According to the technical scheme, under the condition that the core network equipment acquires the RN participating in current service data transmission and the IP address of the RN, the core network equipment packs the current service data into a data packet containing the IP address and a data packet not containing the IP address, the two data packets are sent to the eNB, the eNB judges whether the received data packet contains the IP address, and if so, the received data packet is transmitted to the corresponding RN. The core network equipment sends the two data packets to the eNB, and the eNB can directly transmit the data packets in a transparent mode, so that the processing time of the eNB side for the data packets can be reduced, and the data transmission time delay from the core network equipment to the UE is reduced.
And under the condition that the core network equipment cannot know or does not need to know whether the RN participates in the current service data transmission, the core network equipment sends a data packet to the eNB, the eNB judges whether the RN participates in the current service data transmission, and if so, the data packet is forwarded to the corresponding RN. Because the RN is transparent to the core network equipment, the core network equipment only needs to send one data packet to the eNB, so that the data transmission quantity between the core network equipment and the eNB can be reduced, and meanwhile, the existing core network equipment does not need to be changed.
Drawings
Fig. 1 is a schematic diagram of an access network composition of a cellular system incorporating RNs.
Fig. 2 is a schematic diagram of a network for implementing an MBMS service in a mobile communication system.
Fig. 3 is a structure diagram of a user plane for implementing MBMS service synchronization in a mobile communication system.
Fig. 4 is a flowchart of a first method for forwarding data by an eNB according to the present invention.
Fig. 5 is a flowchart of a second method for forwarding data by an eNB according to the present invention.
Fig. 6 is a schematic diagram of a first system for forwarding data through an eNB according to the present invention.
Fig. 7 is a schematic diagram of a second system for forwarding data through an eNB according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.
In the invention, the eNB and the RN need to send the same data, wherein the data sent by the RN needs to be firstly forwarded to the RN by the eNB. And further, a specific method for the eNB to forward data to the RN if it needs to ensure that the RN and the eNB synchronously issue the same data is discussed.
The following describes the present invention with embodiments respectively according to whether core network equipment can acquire related information of RN participating in current service data transmission.
The first embodiment:
in this embodiment, the core network device can acquire the RN participating in the current service data transmission and the IP address of the RN.
Fig. 4 is a flowchart of a first method for forwarding data through an eNB according to the present invention, and as shown in fig. 4, the method includes:
In this step, the core network device may obtain the RN participating in the transmission of the current service data and the IP address of the RN from the information in the operation maintenance OM module; and the eNB can report whether the RN governed by the eNB participates in the current service data transmission to the core network equipment.
If the RN and the eNB need to ensure that the data packets containing the same service data content are synchronously transmitted, the time occupied by the data packets transmitted between the RN and the eNB can be reserved in advance on the eNB side, namely, the time when the eNB and the RN transmit the data packets containing the same service data content is determined according to the transmission delay of the data packets between the eNB and the RN, and the eNB and the RN respectively transmit the data packets at the time.
In step 403, the eNB determines whether the received data packet includes the IP address, if so, performs step 404, otherwise performs step 405.
In step 404, the eNB passes through the received data packet to the corresponding RN.
In this step, the eNB does not analyze the data packet containing the IP address of the RN, but directly forwards the data packet to the RN.
In step 405, the eNB parses the data packet and performs corresponding processing.
The present invention mainly discusses how the eNB forwards data to the RN, therefore, in the first embodiment, if the data packet does not include the IP address of the RN in step 403, the data packet does not need to be transmitted to the RN, and it is not within the scope of the present invention to specifically process the data packet.
Second embodiment:
in this embodiment, the core network device cannot acquire or does not need to acquire the RN participating in the current service data transmission and the IP address of the RN.
Fig. 5 is a flowchart of a second method for forwarding data through an eNB according to the present invention, and as shown in fig. 5, the method includes:
The difference between this step and step 401 is that, for the current service data, it needs to be packed into two data packets in step 401 and then sent to the eNB, where one data packet carries the IP address of the RN and the other data packet does not carry the IP address of the RN, and in this step 501, it only needs to pack the current service data into one data packet and send to the eNB.
In this step, in order to ensure that the RN and the eNB synchronously issue the data packets containing the same service data content, the eNB and the RN determine the time when the eNB and the RN issue the data packets containing the same service data content according to the transmission delay of the data packets between the eNB and the RN, and the eNB and the RN issue the data packets respectively at the time.
The method includes that core network equipment learns in advance whether an RN governed by an eNB participates in current service data transmission or not, if yes, the time when the eNB and the RN issue data packets containing the same service data content is determined according to transmission delay of the data packets between the eNB and the RN, and the eNB and the RN respectively issue the data packets at the time; or the core network device does not need to know whether the RN administered by the eNB participates in current service data transmission, and the core network device assumes that the RN administered by the eNB participates in current service data transmission, so that the time when the eNB and the RN issue the data packets containing the same service data content is determined according to the transmission delay of the data packets between the eNB and the RN, and the eNB and the RN issue the data packets respectively at the time.
The method for acquiring whether the RN governed by the eNB participates in current service data transmission by the core network equipment comprises the following steps: the core network equipment acquires the RN participating in the transmission of the current service data and the IP address of the RN from the information in the operation maintenance OM module; or, the eNB reports whether the RN governed by the eNB participates in the current service data transmission to the core network equipment.
In step 502, the eNB determines whether the RN governed by the eNB participates in the current service data transmission, if yes, step 503 is executed, and if not, step 504 is executed.
In this step, if the UE under the jurisdiction of the RN requests the eNB for the current service, or if the RN participates in the current service data transmission and can enhance the signal reception quality of the user in the neighboring cell, the eNB determines that the RN participates in the current service data transmission, otherwise, the eNB determines that the RN does not participate in the current service data transmission.
In step 503, the eNB forwards the received data packet to the RN participating in the current service data transmission.
In step 504, the eNB does not forward the received data packet to the RN.
The current service in the first embodiment and the second embodiment may be an MBMS service, and correspondingly, the core network device may be an MBMS-GW, and a data packet of the current service may include data such as a synchronization message of the MBMS service.
In the first and second embodiments, after receiving the MBMS service data packet forwarded by the eNB, the RN transmits the MBMS data on the specified time-frequency resource in a predetermined transmission manner according to the indication of the data packet.
Fig. 6 is a schematic diagram of a first system for forwarding data through an eNB according to the present invention, and as shown in fig. 6, the system includes a core network device 601, an eNB602, and an RN 603.
The core network device 601 acquires the RN participating in the transmission of the current service data and the IP address of the RN, packages the current service data into a data packet including the IP address and a data packet not including the IP address, and sends the two data packets to the eNB 602.
The eNB602 determines whether the received data packet includes the IP address, and if so, passes the received data packet through to the corresponding RN 603.
RN603 receives the data packet from eNB 602.
Fig. 7 is a schematic diagram illustrating a second system for forwarding data through an eNB according to the present invention, and as shown in fig. 7, the system includes a core network device 701, an eNB702, and an RN 703.
The core network device 701 sends the current service data packet to the eNB 702.
The eNB702 determines whether the RN703 governed by the eNB702 participates in the current service data transmission, and if so, forwards the received data packet to the RN703 participating in the current service data transmission.
The RN703 receives the data packet transmitted from the eNB 702.
When the method or the first system of the first embodiment is adopted to forward data, the data transmission delay from the core network to the RN can be shortened. When the method of the second embodiment or the second system is adopted to forward data, the introduction of the RN can be made almost transparent to the MBMS-GW, thereby largely avoiding the change of the core network protocol, the system complexity caused by the introduction of the RN is controlled at the eNB side, and since the MBMS-GW does not need to send a data packet to the RN, the load of the core network is reduced, and the data transmission amount is also reduced.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A method for forwarding data to a Relay Node (RN) through a base station (eNB), the method comprising:
the core network equipment acquires the RN participating in current service data transmission and the IP address of the RN, packs the current service data into a data packet containing the IP address and a data packet not containing the IP address, sends the two data packets to the eNB, and the eNB judges whether the received data packet contains the IP address or not, and if so, transmits the received data packet to the corresponding RN.
2. The method of claim 1, further comprising:
and determining the time when the eNB and the RN issue the data packets containing the same service data content according to the transmission delay of the data packets between the eNB and the RN, and respectively issuing the data packets by the eNB and the RN at the time.
3. The method of claim 1, wherein the learning, by the core network device, of the RN participating in current service data transmission and the IP address of the RN comprises:
the core network equipment acquires the RN participating in the transmission of the current service data and the IP address of the RN from the information in the operation maintenance OM module;
or,
and the eNB reports whether the RN governed by the eNB participates in the current service data transmission to the core network equipment.
4. A method according to claim 1, 2 or 3, wherein the current service is a multicast broadcast MBMS service and the core network device is a multicast broadcast gateway MBMS-GW.
5. A method for forwarding data to a RN through an eNB, the method comprising:
and the core network equipment sends the current service data packet to the eNB, the eNB judges whether the RN governed by the eNB participates in the current service data transmission, and if so, the received data packet is forwarded to the RN participating in the current service data transmission.
6. The method of claim 5, further comprising:
and determining the time when the eNB and the RN issue the data packets containing the same service data content according to the transmission delay of the data packets between the eNB and the RN, and respectively issuing the data packets by the eNB and the RN at the time.
7. The method of claim 5 or 6, wherein the current service is an MBMS service and the core network device is an MBMS-GW.
8. The method of claim 5 or 6,
and if the UE under the jurisdiction of the RN requests the current service, or if the RN participates in the current service data transmission and can enhance the signal receiving quality of the user in the adjacent cell, the eNB judges that the RN participates in the current service data transmission.
9. A system for forwarding data to RN through eNB is characterized in that the system comprises core network equipment, eNB and RN;
the core network equipment acquires the RN participating in the transmission of the current service data and the IP address of the RN, packs the current service data into a data packet containing the IP address and a data packet not containing the IP address, and sends the two data packets to the eNB;
the eNB judges whether the received data packet contains the IP address, and if so, transmits the received data packet to the corresponding RN;
and the RN receives the data packet sent by the eNB.
10. A system for forwarding data to RN through eNB is characterized in that the system comprises core network equipment, eNB and RN;
the core network equipment sends the current service data packet to the eNB;
the eNB judges whether the RN governed by the eNB participates in current service data transmission, and if so, forwards the received data packet to the RN participating in the current service data transmission;
and the RN receives the data packet sent by the eNB.
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| CN103220816A (en) * | 2012-01-19 | 2013-07-24 | 北京三星通信技术研究有限公司 | Port access and communication method between RN and core network |
| CN107786947A (en) * | 2016-08-31 | 2018-03-09 | 成都鼎桥通信技术有限公司 | MBMS data transmission method, donor base station, via node and system |
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| US10945124B2 (en) | 2012-01-19 | 2021-03-09 | Samsung Electronics Co., Ltd. | Method for establishing an interface and communication between a relay node and a core network |
| CN107786947A (en) * | 2016-08-31 | 2018-03-09 | 成都鼎桥通信技术有限公司 | MBMS data transmission method, donor base station, via node and system |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210615 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |