WO2012174903A1

WO2012174903A1 - Method, system and anchor network element for joint transmission

Info

Publication number: WO2012174903A1
Application number: PCT/CN2012/072757
Authority: WO
Inventors: 邓云
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-23
Filing date: 2012-03-21
Publication date: 2012-12-27
Also published as: CN102843723B; CN102843723A

Abstract

The present invention discloses a method for joint transmission, wherein, an anchor network element sends a joint transmission request to a non-anchor network element; after receiving a joint transmission response sent from the non-anchor network element, the anchor network element allocates radio resources for a user equipment in the system which the anchor network element itself belongs to, wherein, the joint transmission response includes the radio resources allocated by the non-anchor network element; the anchor network element sends bearer establishment or reconfiguration signaling to the user equipment through RRC signaling, wherein, the bearer establishment or reconfiguration signaling carries the radio resources for the user equipment, according to which the user equipment performs the joint transmission, allocated respectively by itself and the non-anchor network element. The present invention also discloses a system and an anchor network element for joint transmission. With the solutions of this invention, the cross-system joint transmission of the user equipment data is implemented, and the problem of RRC connection maintenance, wherein the user equipment simultaneously accesses two systems, is solved.

Description

Method, system and anchor network element for joint transmission

The present invention relates to mobile communication technologies, and in particular, to a joint transmission method, system, and anchor network element. Background technique

The architecture of the existing 3rd Generation Partnership Project (3GPP) access system, as shown in FIG. 1, includes a radio access network part and a core network part, wherein the radio access network part includes GERAN (GSM EDGE Radio Access Network), Universal Mobile Telecommunications System (UMTS) access network and Long Term Evolution (LTE) access network. Both the access network of the GERAN and the UMTS are connected to the core network element GPRS service support node (SGSN), and the LTE access network is connected to the core network element mobility management entity (MME, Mobility Management Entity). GERAN refers to a Base Station Subsystem (BSS). The BSS includes a Base Station Controller (BSC) and a Base Station (BS). The access network element of the UMTS includes a Radio Network Controller (RNC, Radio Network Controller and base station (NodeB); The access network element of LTE is an evolved base station (eNB, Evolved NodeB). In order to ensure that the connected user equipment (UE, User Equipment) can move freely between different access systems, an S3 interface is established between the SGSN and the MME, and the interface can implement switching between user equipments in different access systems. .

In order to achieve a higher transmission rate, 3GPP proposes a carrier aggregation (Carrier Aggregation) technology scheme, which uses multiple carriers to simultaneously serve user equipment. The existing carrier aggregation scheme mainly utilizes multiple carriers in a single system to simultaneously provide services for user equipment. For example, in UMTS, two or more carriers are used to simultaneously communicate with user equipment, or two or two are used in LTE. More than one carrier simultaneously maintains communication with the user equipment. However, in actual networks, due to the limitation of the number of carrier frequencies, some mobile operators do not have enough frequencies to deploy multiple UMTS and

In the LTE system, the mobile operator adjusts the carrier frequency of UMTS and LTE according to the number of user equipments accessing the network. Since the UMTS system and the LTE system coexist for a long time, when the capacity of a single system (the limitation of the carrier frequency) is insufficient to provide a high transmission rate, a scheme using a joint transmission of different systems is also conceived, which may also be called a carrier across systems. Aggregation, the user equipment uses two access technologies at the same time, and establishes two wireless links for transmitting data, which not only can achieve higher throughput, but also achieve better load balancing effect. Before the joint transmission scheme is adopted, the load balancing between the systems can only be implemented by the method of switching and redirection. If the joint transmission scheme is adopted, the network side can dynamically adjust each user equipment according to the load of different access systems. The transmission rate on different links can better achieve load balancing.

When a user equipment adopts a cross-system joint transmission scheme, the user equipment has the capability to support both hardware and software of the two access technologies. In the joint transmission mode, the user equipment has two different wireless links, and how to configure the two wireless links on the network side, whether the two wireless links are independent, and whether the user equipment needs to maintain two radio resource control (RRC, Radio) Resource Control) There are no specific solutions at present. Summary of the invention

In view of this, the main purpose of the present invention is to provide a joint transmission method, system, and anchor network element, which can implement cross-system joint transmission of user equipment data, and solve RRC connection maintenance when user equipment accesses two systems simultaneously. problem.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

A method for joint transmission provided by an embodiment of the present invention includes:

The anchor network element sends a joint transmission request to the non-anchor network element;

After receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates a radio resource to the user equipment in the system where the anchor network element is located, where the joint transmission response includes The non-anchor network element allocates radio resources for the user equipment in the system in which the non-anchor network element is located; the anchor network element sends bearer setup or reconfiguration signaling to the user equipment by using RRC signaling, where the bearer is established. Or the reconfiguration signaling carries the radio resource allocated by the user equipment and the non-anchor, respectively, for the user equipment to perform joint transmission according to the radio resource carried by the bearer setup or reconfiguration signaling.

In the above solution, the anchor network element is an access network element of a system that has established an RRC connection with the user equipment; the non-anchor network element is an access network element of a different system that simultaneously covers the user equipment. ;

The system that has established an RRC connection with the user equipment and the different system that simultaneously covers the user equipment are respectively a UMTS system and an LTE system, or are respectively an LTE system and a UMTS system; the access network element of the UMTS system is an RNC Or a base station; the access network element of the LTE system is an evolved base station.

In the above solution, the joint transmission request includes user equipment data transmission parameter information and target cell identity information participating in joint transmission.

In the foregoing solution, the radio resource includes at least one of the following: a radio network temporary identifier (RNTI, Radio Network Temporary Identity), a scrambling code, a random access parameter, and a physical layer configuration parameter.

In the above solution, the bearer setup or reconfiguration signaling multiplexes existing RRC signaling or RRC signaling for newly added radio resources allocated for user equipment in each system.

In the above solution, the radio resource allocated by the non-anchor network element for the user equipment in the system is a random access resource, and the user equipment initiates random access according to the random access resource to obtain uplink synchronization.

In the above solution, the method further includes: after receiving the joint transmission response, the anchor network element establishes a data transmission channel of the user equipment with the non-anchor network element.

In the above solution, the data transmission channel includes an uplink and/or a downlink, and is received for the downlink. The access network element of the joint transmission response distributes the data packet to the access network element that receives the joint transmission request, and the user equipment receives the access network element of the joint transmission response and the access network that receives the joint transmission request. The data packets respectively sent by the UE are merged; for the uplink, the user equipment distributes the data packet to the access network element that receives the joint transmission response and the access network element that receives the joint transmission request, and receives the joint transmission response. The access network element performs data packet combining.

In the above solution, the method further includes:

When the system that has established the RRC connection with the user equipment is the UMTS system, the location area code (LAC) of the UMTS system cell, the routing area code (RAC), and the global cell identifier ( CGI, Cell Global Identifier) is a non-access stratum (NAS) mobile information of the user equipment;

When the system that has established the RRC connection with the user equipment is the LTE system, the Tracking Area Code (TAC) of the LTE system cell that the user equipment accesses, and the CGI is the NAS layer mobility information of the user equipment.

A joint transmission system provided by the embodiment of the present invention includes: a user equipment, an anchor network element, and a non-anchor network element;

The anchor network element is configured to send a joint transmission request to the non-anchor network element; after receiving the joint transmission response, allocate a radio resource to the user equipment in the system where the system is located, and send the bearer to the user equipment by using RRC signaling. Establishing or reconfiguring signaling, where the bearer setup or reconfiguration signaling carries radio resources allocated by the self and non-anchor network elements to the user equipment;

The non-anchor network element is configured to: after receiving the joint transmission request, allocate a radio resource to the user equipment in the system, and return a joint transmission response carrying the allocated radio resource; After receiving the bearer setup or reconfiguration signaling, the data is transmitted across the system according to the acquired radio resources.

In the foregoing solution, the joint transmission request includes user equipment data transmission parameter information and target cell identity information that participates in joint transmission; The radio resource includes at least one of the following: an RNTI, a scrambling code, a random access parameter, and a physical layer configuration parameter.

An anchor network element in a joint transmission system according to an embodiment of the present invention, where the anchor network element includes: a joint transmission request module and a joint transmission establishment module;

The joint transmission request module is configured to send a joint transmission request to the non-anchor network element when determining that the user equipment needs to perform joint transmission;

The joint transmission establishing module is configured to: after receiving the joint transmission response sent by the non-anchor network element, allocate a radio resource to the user equipment in the system, and send the bearer establishment or heavy to the user equipment by using RRC signaling. The signaling is configured to carry the radio resource allocated by the non-anchor network element to the user equipment in the system in which the non-anchor network element is located, and the bearer network element and the non-anchor network element are carried in the bearer establishment or reconfiguration signaling. The wireless resource allocated by the user equipment.

An embodiment of the present invention provides a joint transmission method, system, and anchor network element, where an anchor network element sends a joint transmission request to a non-anchor network element; the anchor network element receives the non-anchor network element. After the joint transmission response is sent, the user equipment is allocated a radio resource in the system, where the joint transmission response includes the wireless allocated by the non-anchor network element to the user equipment in the system in which the non-anchor network element is located. The anchor network element sends, by using RRC signaling, bearer setup or reconfiguration signaling to the user equipment, where the bearer setup or reconfiguration signaling carries itself and the non-anchor point is respectively the user equipment. The allocated radio resource is configured to enable the user equipment to perform joint transmission according to the radio resource carried by the bearer setup or reconfiguration signaling; thus, the cross-system joint transmission of the user equipment data can be implemented, and the user equipment is simultaneously accessed. The RRC connection maintenance problem of the system does not require the establishment of a second RRC connection. The solution of the embodiment of the present invention helps the network side to balance the load between different systems, which helps to improve the data transmission rate of the user equipment. DRAWINGS

Figure 1 is a schematic diagram of the architecture of an existing third-generation partnership plan access system; 2 is a schematic flowchart of a method for implementing joint transmission according to an embodiment of the present invention; FIG. 3 is a schematic flowchart of a method for implementing joint transmission according to Embodiment 1 of the present invention; FIG. 4 is a schematic diagram of a method for implementing joint transmission according to Embodiment 2 of the present invention; FIG. 5 is a schematic flowchart of a method for implementing joint transmission according to Embodiment 3 of the present invention. detailed description

The anchor network element sends a joint transmission request to the non-anchor network element; after receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates a radio resource to the user equipment in its own system. The joint transmission response includes the radio resource allocated by the non-anchor network element to the user equipment in the system in which the non-anchor network element is located; the anchor network element sends a bearer establishment to the user equipment by using RRC signaling. Or reconfiguring the signaling, the bearer setup or reconfiguration signaling carries the radio resources allocated by the user equipment and the non-anchor point respectively for the user equipment, so that the user equipment establishes or reconfigures the information according to the bearer. The carried wireless resources are jointly transmitted.

The invention will be further described in detail below with reference to the drawings and specific embodiments.

The embodiment of the present invention implements a joint transmission method. As shown in FIG. 2, the method includes the following steps:

Step 101: The anchor network element sends a joint transmission request to the non-anchor network element when determining that the user equipment needs to perform joint transmission;

The joint transmission request includes user equipment data transmission parameter information and target cell identification information that participates in joint transmission, and the user equipment data transmission parameter information such as a data quality bearer (DRB, Data Radio Bearer) quality of service parameter.

Step 102: The non-anchor network element that receives the joint transmission request allocates radio resources to the user equipment in its own system, and returns a joint transmission response carrying the allocated radio resources.

Specifically, the non-anchor network element that receives the joint transmission request allocates radio resources to the user equipment in the system in which the non-anchor network element receives the user equipment data transmission parameter information and the target cell identity information that participates in the joint transmission, and satisfies as much as possible User equipment data transmission requirements, in return The returned joint transmission response carries the radio resource allocated to the user equipment, and the radio resource includes at least one of the following: RNTI, scrambling code, random access parameter, physical layer configuration parameter, and the like.

Step 103: The anchor network element that receives the joint transmission response allocates radio resources to the user equipment in its own system, and sends bearer setup or reconfiguration signaling to the user equipment by using RRC signaling, where the bearer is established or heavy. The configuration signaling carries the radio resources allocated by the self and non-anchor network elements to the user equipment;

In this step, the bearer setup or reconfiguration signaling may multiplex existing RRC signaling, such as Radio Bearer Setup, or Radio Bearer Reconfiguration, or RRC Connection Reconfiguration (RRC). Connection Reconfiguration), RRC signaling may also be newly added, and the RRC signaling carries radio resources allocated to user equipment in each system.

Step 104: After receiving the bearer setup or reconfiguration signaling, the user equipment transmits data according to the obtained radio resources across the system.

Specifically, after receiving the bearer setup or reconfiguration signaling, the user equipment applies the radio resource allocated for the user equipment, and transmits the data through the system where the anchor network element and the non-anchor network element are located.

In this step, the radio resource allocated by the non-anchor network element to the user equipment may include a random access resource, and the random access resource is allocated by the non-anchor network element, and is sent to the user equipment by using the anchor network element, and the user equipment The random access is initiated according to the random access resource to obtain uplink synchronization, and then the user equipment can implement uplink and downlink data transmission in the cell covered by the system where the non-anchor network element is located.

Further, in consideration of the operator's layout of the jointly transmitted network, in order to reduce the synchronization problem of the user equipment in different systems, the system in which the anchor network element and the non-anchor network element are located is deployed in a synchronized state, so that the user equipment is After the synchronization with one system is obtained, the synchronization with another system is automatically obtained. At this time, in step 104, the non-anchor network element may not include the random access resource in the radio resource allocated by the user equipment. Further, in the foregoing solution, after receiving the joint transmission response, the anchor network element establishes a data transmission channel with the non-anchor network element for the user equipment, where the data transmission channel includes uplink and/or downlink, and for the downlink, the anchor The point network element distributes the data packet to the non-anchor network element, and the user equipment combines the data packets sent by the anchor network element and the non-anchor network element respectively; for the uplink, the user equipment distributes the data packet to the anchor network element and For non-anchor network elements, data packet combining is performed by the anchor network element.

In this embodiment, the anchor network element is an access network element of a system that has established an RRC connection with a user equipment; the non-anchor network element is an access network of a different system that simultaneously covers the user equipment. And the different system is a system other than the system where the anchor network element is located;

Further, in the above solution, when the system that has established the RRC connection with the user equipment is the UMTS system, the LAC, RAC, and CGI of the UMTS system cell that the user equipment accesses are non-access stratum (NAS) mobiles of the user equipment. Information

When the system that has established the RRC connection with the user equipment is the LTE system, the TAC and CGI of the LTE system cell that the user equipment accesses are the NAS layer mobility information of the user equipment.

In order to implement the foregoing method, the embodiment of the present invention further provides a system for joint transmission, where the system includes: a user equipment, an anchor network element, and a non-anchor network element;

The anchor network element is an access network element of a system that has established an RRC connection with the user equipment, and is configured to send a joint transmission request to the non-anchor network element when determining that the user equipment needs to perform joint transmission; After the transmission response, the user equipment is allocated radio resources in the system, and the bearer setup or reconfiguration signaling is sent to the user equipment by using RRC signaling, where the bearer setup or reconfiguration signaling carries its own and non-anchor network. The radio resource allocated by the user equipment;

The non-anchor network element is an access network element of the system that covers the user equipment at the same time as the system in which the anchor network element is located, and is configured to allocate the user equipment in the system in which it is located after receiving the joint transmission request. Radio resources, and return a joint transmission response carrying the allocated radio resources;

The user equipment is configured to: after receiving the bearer setup or reconfiguration signaling, transmit data according to the acquired radio resources across the system; The joint transmission request includes user equipment data transmission parameter information and target cell identification information participating in joint transmission;

The radio resource includes at least one of the following: an RNTI, a scrambling code, a random access parameter, and a physical layer configuration parameter;

The radio resource allocated by the non-anchor network element to the user equipment may include a random access resource, and the user equipment initiates random access according to the random access resource to obtain uplink synchronization, and then the user equipment may cover the system where the non-anchor network element is located. Realizing the transmission of uplink and downlink data in the cell;

Further, the anchor network element includes: a joint transmission request module and a joint transmission establishment module;

Based on the above system, the embodiment of the present invention further provides an anchor network element in a joint transmission system, where the anchor network element includes: a joint transmission request module and a joint transmission establishment module;

The joint transmission establishing module is configured to: after receiving the joint transmission response sent by the non-anchor network element, allocate a radio resource to the user equipment in the system, and send the bearer establishment or heavy to the user equipment by using RRC signaling. The signaling is configured to carry the radio resource allocated by the non-anchor network element to the user equipment in the system in which the non-anchor network element is located, and the bearer network element and the non-anchor network element are carried in the bearer establishment or reconfiguration signaling. The wireless resource allocated by the user equipment. Embodiment 1

In this embodiment, the user equipment UE1 resides in the cell 1 of the base station 1 in the UMTS system, and is in an idle state, and the base station 1 is under the jurisdiction of the RNC. The cell 2 having the same coverage as the cell 1 is governed by the evolved base station 2, which belongs to the LTE system. In the UMTS system, an Iub interface is established between the RNC and the base station 1. Since the RNC may perform joint transmission with the evolved base station 2 in LTE, a new interface is established between the RNC and the evolved base station 2 for transmitting data and control signaling. The interface establishment between the RNC and the evolved base station 2 can be implemented by an Operation & Maintenance server. This embodiment implements a joint transmission method. As shown in FIG. 3, the method includes the following steps:

Step 201: The UE1 initiates a random access in the cell 1 and sends an RRC connection request to the RNC. Step 202: The RNC accepts the connection request sent by the UE1, and returns an RRC connection setup (RRC Connection Setup) signaling to the UE1, where the RRC connection setup signal is sent. The command includes configuration parameters of a Signaling Radio Bearer (SRB);

Step 203: The UE1 applies the configuration parameter of the SRB in the RRC connection setup signaling, and sends an RRC Connection Setup Complete (RRC Connection Setup Complete) signaling to the RNC.

The RRC connection setup complete signaling further includes capability information of UE1, that is, capability information of UE1 supporting joint transmission.

So far, UE1 has established an RRC connection with the RNC.

Step 204: The UE1 sends an initial direct transfer (Initial Direct Transfer) signaling to the RNC, where the non-access stratum signaling, that is, the service request is received; after receiving the initial direct signaling, the RNC sends the service request to the core network.

Step 205: After receiving the service request, the core network, after authenticating the user equipment, returns a Radio Access Bearer Assignment Request (RN), which includes the quality of service parameters of the DRB1 to be established. In this step, the bearer of the radio access bearer assignment request corresponds to the DRB1 of the air interface. In this embodiment, the data transmission rate required by the DRB1 is high, that is, the data rate included in the quality of service parameter is high.

Step 206: The RNC detects that the radio resource of the cell 1 cannot meet the data transmission rate requirement of the DRB1, and the RNC selects the cell 2 as the target cell participating in the joint transmission, and the RNC sends the joint transmission request to the evolved base station 2 through the interface with the evolved base station 2. Included in the request, the QoS parameter information of the DRB1 and the cell identity information of the cell 2;

In this step, the RNC can conclude that the cell 1 cannot meet the DRB1 requirement according to the radio resource used by the cell 1 and the radio resource that the DRB1 needs to occupy.

The RNC may send a measurement configuration to the UE1 to allow the UE 14 to report the neighboring area that satisfies the signal condition, and select the cell 2 as the target cell for the joint transmission according to the measurement report reported by the UE1;

This embodiment is not limited to the signaling name used to indicate that cross-system joint transmission needs to be established.

Step 207: After receiving the joint transmission request, the evolved base station 2 accepts the request, allocates the radio resource of the UE1 in the cell 2, and returns the allocated radio resource to the RNC through the joint transmission response, where at least one of the following is included: RNTI, scrambling code, random access parameters, physical layer configuration parameters, etc.;

Step 208: After receiving the joint transmission response returned by the evolved base station 2, the RNC allocates the radio resource of the UE1 in the cell 1, and sends the bearer setup signaling to the UE1 through the RRC signaling, where the bearer setup signaling includes the RNC allocated to the UE1. Radio resources and radio resources allocated by the evolved base station 2 for the UE1;

The bearer setup signaling may multiplex existing RRC signaling, such as radio bearer setup, or radio bearer reconfiguration, or RRC connection reconfiguration, or may newly add RRC signaling, which is carried in each joint. A radio resource allocated to a user equipment in a transmission system.

Step 209: After receiving the bearer setup signaling, the UE1 applies the radio resource allocated by the RNC to the UE1 and the radio resource allocated by the evolved base station 2 to the UE1, and simultaneously passes through the cell 1 and the cell 2. transfer data;

It should be noted that, in step 209, the radio resource of the cell 2 received by the UE1 may include a random access resource, and the random access resource is allocated by the base station 2, and is sent to the UE1 via the RNC, and the UE1 according to the random access. The resource initiates random access in cell 2 to obtain uplink synchronization, and then UE1 can implement uplink and downlink data transmission in cell 2.

Considering that the operator deploys the jointly transmitted network, in order to reduce the synchronization problem of the user equipment in different systems, the UMTS system and the LTE system are deployed in a synchronized state, that is, the UE1 automatically obtains the synchronization with the UMTS after acquiring the synchronization with the UMTS. Synchronization, such that UE1 does not need to implement random access in cell 2 to obtain uplink synchronization. At this time, the radio resource allocated by cell 2 for UE1 may not include random access resources.

It should be noted that after the RNC receives the joint transmission response returned by the evolved base station 2, a data transmission channel for the UE1 needs to be established between the RNC and the evolved base station 2, and the data transmission channel includes uplink and/or downlink. The RNC distributes a part of the downlink data packet of the UE1 to the evolved base station 2, so that the evolved base station 2 has sufficient downlink data transmission when communicating with the UE1. Here, the RNC needs to add a new data distribution function, and selects a partial data packet to be sent to the evolved base station. 2. Transmission to UE1 by the evolved base station 2. The UE1 combines the data packets sent by the RNC and the evolved base station 2, and the UE1 can multiplex the existing radio link control layer (Radio Link Control) to implement the merge and reassembly of the data packets. The application layer can still receive complete, ordered packets. For the uplink, the data distribution function of UE1 transmits part of the data packet in the UMTS system through the RNC, and the remaining part of the data packet is transmitted in the LTE system through the evolved base station 2. After receiving the data packet, the evolved base station 2 forwards the data packet to the RNC, and the data is forwarded by the RNC. Package consolidation, restructuring. In this way, the uplink data transmitted by UE1 through the two systems can also be completely transmitted to the RNC, and then sent to the core network through the RNC.

In this embodiment, although UE1 adopts the joint transmission mode, UE1 only maintains an RRC connection with the RNC, that is, there is only one RRC connection, and no second RRC is established with the evolved base station 2. connection. The RNC is an anchor network element, and the evolved base station 2 is a non-anchor network element. The cell that UE1 accesses includes cell 1 and cell 2, but cell 2 is only a resource cell of UE1, or is called a resource carrier, or a secondary cell. The LAC, RAC, and CGI broadcasted in the system message of the cell 1 are the non-access stratum (NAS, non-Access Stratum) mobile information of the UE1, and the location information provided by the UE1 to the core network is the LAC, RAC, and CGI of the cell 1. . After the UE1 adopts the joint transmission mode, the system message of the cell 2 may change. However, the UE1 does not need to learn the cell message change of the cell 2 by listening to the paging message of the cell 2. When the system message of the cell 2 changes, the evolved base station 2 The RNC sends the changed system message, and the RNC sends the updated system message of the cell 2 to the UE1 through the RRC signaling.

Embodiment 2

In this embodiment, the user equipment UE2 is connected to the network through the LTE system, and the UE2 accesses the cell 3 under the evolved base station 3, that is, the evolved base station 3 has established an RRC connection for the UE2. The base station 4 in the UMTS system is governed by the RNC, and the cell 4 under the base station 4 overlaps with the coverage area of the cell 3.

The application scenario of this embodiment is as follows: UE2 has established a DRB, which is represented by DRB1. If the UE2 needs to create a new DRB2, and the evolved base station 3 does not have sufficient resources to meet the quality of service parameters of the new DRB2 of the UE2, the evolved base station 3 has learned that the UE2 has the capability of supporting joint transmission when the UE2 accesses the network, so the evolved base station 3 It is desirable to use the joint transmission method to enable UE2 to obtain more radio resources. The evolved base station 3 learns that the signal quality of the cell 4 exceeds a predetermined threshold by the measurement report reported by the UE2, and the evolved base station 3 needs to configure joint transmission for the UE2. The method for joint transmission in this embodiment, as shown in FIG. 4, includes the following steps:

Step 301: The evolved base station 3 sends a joint transmission request to the RNC through an interface with the RNC, where the joint transmission request includes the quality of service parameter information of the DRB2 and the cell identity information of the cell 4. Step 302: After receiving the joint transmission request, the RNC accepts the request, allocates the radio resource of the UE2 in the cell 4, and returns the allocated radio resource to the evolved base station 3 by using the joint transmission response, where at least one of the following is included: in the cell 4 or the RNC RNTI, scrambling code, random access parameters, physical layer configuration parameters, etc.

In this step, the radio resource of the UE2 in the cell 4 is allocated, and the radio resource of the UE2 in the cell 4 is generally allocated according to the quality of service parameter of the DRB2, and the DRB2 data transmission requirement of the user equipment is met as much as possible.

Step 303: After receiving the joint transmission response returned by the RNC, the evolved base station 3 allocates the radio resource of the UE2 in the cell 3, and sends the bearer setup signaling to the UE2 through the RRC signaling, where the bearer setup signaling includes the evolved base station 3 The radio resource configured by the UE2 and the radio resource configured by the RNC for the UE2;

Step 304: After receiving the bearer setup signaling, the UE2 applies the radio resource configured by the evolved base station 3 to the UE2 and the radio resource configured by the RNC to the UE2, and simultaneously transmits data through the cell 3 and the cell 4.

So far, the network side configures the joint transmission mode for the DRB2 for the UE2, and the UE2 can simultaneously transmit the data of the DRB2, including the uplink and downlink data, by using the radio resources of the cell 3 and the cell 4, and the DRB1 established by the UE2 is still limited to the cell 3. Although the radio resource of the cell 3 cannot guarantee the quality of service parameter requirement of the DRB2, by sharing part of the radio resources of the cell 4, the quality of service parameter requirement of the DRB2 can be met, and the evolved base station 3 can not satisfy the DRB2 before the joint transmission is not introduced. After the demand, the DRB2 establishment request can only be rejected, and the user's satisfaction is guaranteed.

In this embodiment, after receiving the joint transmission response sent by the RNC, the evolved base station 3 further includes: establishing, by the evolved base station 3 and the RNC, a data transmission channel about the UE2, including an uplink and/or downlink data transmission channel. For the downlink, the evolved base station 3 sends a partial downlink data packet of the UE2 to the RNC, so that the RNC has sufficient downlink data transmission when communicating with the UE2, where The evolved base station 3 needs to add a new data distribution function, and selects some data packets to be sent to the RNC.

The RNC transmits to UE2. UE2 combines the received data packets sent by the RNC and the evolved base station 3 respectively, and UE2 can reuse the function of combining and reorganizing the existing radio link control layer to implement data packet merging and recombination, so that the application layer can still Receive complete, ordered packets. For the uplink, the evolved base station 3 merges and reassembles the data packets, and then sends complete, ordered data packets to the core network.

In this embodiment, although UE2 adopts the joint transmission mode, UE2 only maintains an RRC connection with the evolved base station 3, and does not establish a second RRC connection with the RNC. The evolved base station 3 is an anchor network element, and the RNC is a non-anchor network element. The cell accessed by UE2 includes cell 3 and cell 4, but cell 4 is only a resource cell of UE2. The TAC and CGI broadcasted in the system message of the cell 3 are the NAS layer mobile information of the UE2, and the location information provided by the UE2 to the core network is the TAC and CGI of the cell 3. In the LTE system, the security configuration parameter of the user equipment access layer is related to the cell frequency and the physical cell identifier (PCI) that are accessed by the user equipment. In this embodiment, the security configuration parameters adopted by the user equipment are only related to The cell 3 is related, that is, the frequency of the cell 3 and the PCI determine the security configuration parameters of the user equipment access layer, and have no relationship with the cell 4.

Further, when UE2 has used the technology of carrier aggregation in the LTE system, that is, when UE2 accesses multiple cells in LTE at the same time, the cell that needs the frequency and PCI required to provide security configuration parameters for UE2 is called the primary cell. (Primary Cell), the evolved base station 3 of the LTE system can allocate the radio resources of at least two cells under the jurisdiction of the evolved base station 3 to simultaneously serve the UE2 when configuring the joint transmission for the UE2, and can fully utilize the spare resources in the multiple cells as the UE2. Provide high-speed demand to increase system capacity.

Embodiment 3

In this embodiment, in the UMTS system, if the user equipment UE1 uses the HSPA technology, that is, the uplink is HSUPA (High Speed Uplink Packet Access) and the downlink is HSDPA (High Speed Downlink Packet Access), the scheduling of the user equipment UE1 is not responsible for the RNC. The base station is responsible for, such as the spreading code used by UE1, the time slot using the spreading code, etc., all controlled by the base station. In this embodiment, the base station of the LTE system adopts the joint transmission technology for the UE1, so that the UE1 uses the HSPA technology in the UMTS system and the Orthogonal Frequency Division Multiplexing (OFDM) technology in the LTE system, so the LTE system An interface is established between the evolved base station 1 and the base station 2 in the UMTS system, and the interface is used for transmitting control signaling and data. The interface between the evolved base station 1 and the base station 2 can be implemented by the operation and maintenance server. Generally, the operation and maintenance server establishes a direct interface for them according to the overlapping characteristics of the cell coverage of the evolved base station 1 and the base station 2.

The application scenario of this embodiment is as follows: The UE1 in the cell under the jurisdiction of the evolved base station 1 has established an RRC connection, and the data radio bearer DRB1 is established. However, due to the increase of user equipment in the cell under the jurisdiction of the evolved base station 1, the load thereof is gradually increased. The evolved base station 1 detects that the resource of the cell under the jurisdiction is tight, and hopes to implement joint transmission with the base station 2 for the UE1, so that there are sufficient resources to meet the quality of service parameter requirements of the DRB1. Here, the evolved base station 1 according to the measurement report of the UE1 and the capability information of the UE1, It is decided to perform joint transmission with the cell under the control of the base station 2. In this embodiment, a method for joint transmission is implemented. As shown in FIG. 5, the method includes the following steps:

Step 401: The evolved base station 1 sends a joint transmission request to the base station 2 through a direct interface, where the joint transmission request includes a quality of service parameter of the DRB1 and a cell identifier of the cell under the control of the base station 2; Step 402: After receiving the joint transmission request, the base station 2 receives the joint transmission request Receiving the request, allocating the radio resource of the UE1 to the cell under the control of the base station 2, and returning the allocated radio resource to the evolved base station 1 by using the joint transmission response, the radio resource includes at least one of the following: RNTL scrambling code, random access parameter, physical Layer configuration parameters, etc.

Step 403: After receiving the joint transmission response, the evolved base station 1 allocates the radio resource of the UE1 in the cell under the jurisdiction of the evolved base station 1, and sends the bearer reconfiguration signaling to the UE1 through the RRC signaling, where the bearer reconfiguration signaling includes the evolved The radio resource configured by the base station 1 for the UE1 and the radio resource configured by the base station 2 for the UE1; The RRC signaling may be RRC connection reconfiguration signaling.

Step 404: After receiving the reconfiguration signaling, the UE1 applies the radio resource configured by the evolved base station 1 to the UE1 and the radio resource configured by the base station 2 to the UE1, and simultaneously performs data transmission with the evolved base station 1 and the base station 2.

In this embodiment, although UE1 adopts the joint transmission mode, UE1 only maintains an RRC connection with the evolved base station 1, and does not establish a second RRC connection with the base station 2. The evolved base station 1 is an anchor network element, and the base station 2 is a non-anchor network element. UE1 only utilizes the radio resources of the cell under the jurisdiction of base station 2.

In summary, with the solution of the present invention, cross-system joint transmission of user equipment data can be realized, and the RRC connection maintenance problem in which the user equipment accesses both systems simultaneously is solved.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A method for joint transmission, the method comprising:

After receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates a radio resource to the user equipment in the system in which the anchor network element is located, where the joint transmission response includes the non-anchor point a radio resource allocated by the network element to the user equipment in its own system;

The anchor network element sends bearer setup or reconfiguration signaling to the user equipment by using radio resource control (RRC) signaling, where the bearer setup or reconfiguration signaling carries itself and the non-anchor point respectively The radio resource allocated by the user equipment is used to enable the user equipment to perform joint transmission according to the radio resource carried by the bearer setup or reconfiguration signaling.

The method according to claim 1, wherein the anchor network element is an access network element of a system that has established an RRC connection with a user equipment, and the non-anchor network element simultaneously covers the An access network element of a different system of the user equipment;

The system that has established an RRC connection with the user equipment and the different systems that simultaneously cover the user equipment are respectively a Universal Mobile Telecommunications System (UMTS) and a Long Term Evolution (LTE) system, or are respectively an LTE system and a UMTS system;

The access network element of the UMTS system is a radio network controller (RNC) or a base station; and the access network element of the LTE system is an evolved base station.

3. The method according to claim 2, wherein the joint transmission request comprises user equipment data transmission parameter information and target cell identity information participating in joint transmission.

The method according to claim 2, wherein the radio resource comprises at least one of the following: a radio network temporary identifier (RNTI), a scrambling code, a random access parameter, and a physical layer configuration parameter.

The method according to claim 2, wherein the bearer establishment or reconfiguration signaling reuses existing RRC signaling or is allocated for user equipment in each system for newly added carrying RRC signaling of radio resources.

The method according to claim 2, wherein the radio resource allocated by the non-anchor network element for the user equipment in the system is a random access resource, and the user equipment is configured according to the random access. The resource initiates random access to obtain uplink synchronization.

The method according to claim 2, wherein the method further comprises: after receiving the joint transmission response, the anchor network element establishes a data transmission channel of the user equipment with the non-anchor network element.

The method according to claim 7, wherein the data transmission channel comprises an uplink and/or a downlink, and for the downlink, the access network element that receives the joint transmission response distributes the data packet to receive the joint transmission request. The access network element, the user equipment combines the data packets sent by the access network element that receives the joint transmission response and the access network element that receives the joint transmission request, respectively; The access network element that receives the joint transmission response and the access network element that receives the joint transmission request perform data packet combining by the access network element that receives the joint transmission response.

The method according to claim 2, wherein the method further comprises: when the system that has established an RRC connection with the user equipment is a UMTS system, the location area code (LAC) of the UMTS system cell accessed by the user equipment a Routing Area Code (RAC) and a Global Cell Identity (CGI) are non-access stratum (NAS) mobile information of the user equipment;

When the system that has established the RRC connection with the user equipment is the LTE system, the tracking area identifier (TAC) and CGI of the LTE system cell accessed by the user equipment are the NAS layer mobile information of the user equipment.

A system for joint transmission, the system comprising: a user equipment, an anchor network element, and a non-anchor network element;

The anchor network element is configured to send a joint transmission request to the non-anchor network element; after receiving the joint transmission response, allocate a radio resource to the user equipment in the system where the system is located, and pass the RRC signaling Transmitting or reconfiguring signaling to the user equipment, where the bearer setup or reconfiguration signaling carries a radio resource allocated by the self and non-anchor network element to the user equipment;

The system according to claim 10, wherein the joint transmission request includes user equipment data transmission parameter information and target cell identification information participating in joint transmission;

The radio resource includes at least one of the following: an RNTI, a scrambling code, a random access parameter, and a physical layer configuration parameter.

The system according to claim 10, wherein the anchor network element comprises: a joint transmission request module and a joint transmission establishment module;

An anchor network element in a joint transmission system, where the anchor network element includes: a joint transmission request module and a joint transmission establishment module;

The joint transmission establishing module is configured to: after receiving the joint transmission response sent by the non-anchor network element, allocate radio resources to the user equipment in the system, and provide the user with the RRC signaling. The device sends bearer establishment or reconfiguration signaling; the joint transmission response carries a radio resource allocated by the non-anchor network element to the user equipment in the system, and the bearer setup or reconfiguration signaling carries the anchor network element and A non-anchor network element allocates radio resources to user equipment.