CN102843723B - A kind of method of joint transmission, system and anchor point network element - Google Patents
A kind of method of joint transmission, system and anchor point network element Download PDFInfo
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Abstract
The invention discloses a kind of method of joint transmission, anchor point network element sends joint transmission to non-anchor network element and asked；The anchor point network element is received after the joint transmission response that the non-anchor network element is sent, and itself is being the user equipment distributing radio resource in systems, wherein, the Radio Resource distributed in the joint transmission response comprising the non-anchor network element；The anchor point network element sends carrying to the user equipment by RRC signaling and sets up or reconfigure signaling, the carrying is set up or reconfigured signaling and carries the Radio Resource that itself and the non-anchor are respectively the user equipment distribution, so that the Radio Resource that signaling carrying was set up or reconfigured to the user equipment according to the carrying carries out joint transmission；The present invention also discloses a kind of system of joint transmission and anchor point network element.By the solution of the present invention, the cross-system joint transmission of customer equipment data can be realized, user equipment is solved while accessing the RRC connection maintenance issues of two systems.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a method and a system for joint transmission and an anchor point network element.
Background
An architecture of a third generation partnership project (3GPP) Access System includes, as shown in fig. 1, a Radio Access network portion and a core network portion, where the Radio Access network portion includes a geran (gsm EDGE Radio Access network), a Universal Mobile Telecommunications System (UMTS) Access network, and a Long Term Evolution (LTE) Access network. The access networks of GERAN and UMTS are connected with the GPRS service Support Node (SGSN) of the core network element, and the access network of LTE is connected with the Mobility Management Entity (MME) of the core network element. GERAN refers to a Base Station Subsystem (BSS), which includes a Base Station Controller (BSC) and a Base Station (BS); the access Network element of the UMTS includes a Radio Network Controller (RNC) and a base station (NodeB); the access network element of LTE is an Evolved base station (eNB, Evolved NodeB). In order to ensure that a connected User Equipment (UE) can move freely between different access systems, an S3 interface is established between an SGSN and an MME, and the interface can implement handover of the UE between different access systems.
In order to achieve higher transmission rate, 3GPP proposes a Carrier Aggregation (Carrier Aggregation) technical solution, which uses multiple carriers to simultaneously serve user equipment. Existing carrier aggregation schemes mainly utilize multiple carriers in a single system to provide services for user equipment simultaneously, such as using 2 or more than 2 carriers to maintain communication with the user equipment simultaneously in UMTS or using 2 or more than 2 carriers to maintain communication with the user equipment simultaneously in LTE. However, in practical networks, due to the limitation of the number of carrier frequencies, some mobile operators do not have enough frequencies to deploy multiple UMTS and LTE systems simultaneously, and the mobile operators can adjust the number of UMTS and LTE carriers according to the number of user equipment accessing the network. Because the UMTS system and the LTE system coexist for a long time, when the capacity (the limitation of carrier frequency) of a single system is not enough to provide a high transmission rate, a scheme of joint transmission by using different systems is conceived, which may also be referred to as cross-system carrier aggregation, and the user equipment simultaneously uses two access technologies to establish two wireless links for transmitting data, which not only can obtain higher throughput, but also can achieve better load balancing effect. Before the scheme of joint transmission is not adopted, the load balance among the systems can be implemented only by a switching and redirecting method, and if the scheme of joint transmission is adopted, the network side can dynamically adjust the transmission rate of each user equipment on different links according to the load of different access systems, so that the load balance can be better realized.
When the user equipment adopts a cross-system joint transmission scheme, the user equipment has the capability of simultaneously supporting hardware and software of two access technologies. In the joint transmission mode, the ue has two different Radio links, how the network configures the two Radio links, whether the two Radio links are independent, whether the ue needs to maintain two Radio Resource Control (RRC) connections, and the like.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method, a system and an anchor point network element for joint transmission, which can implement cross-system joint transmission of user equipment data, and solve the problem of RRC connection maintenance when the user equipment accesses two systems simultaneously.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for joint transmission, which comprises the following steps:
the anchor point network element sends a joint transmission request to the non-anchor point network element;
after receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates wireless resources to the user equipment in the system where the anchor network element is located, wherein the joint transmission response comprises the wireless resources allocated to the user equipment by the non-anchor network element in the system where the anchor network element is located;
and the anchor point network element sends a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries the radio resources which are respectively allocated to the user equipment by the anchor point network element and the non-anchor point network element, so that the user equipment performs joint transmission according to the radio resources carried by the bearer establishment or reconfiguration signaling.
In the above scheme, the anchor point network element is an access network element of a system that has established RRC connection with a user equipment; the non-anchor network element is an access network element of a different system which simultaneously covers the user equipment;
the system which establishes RRC connection with the user equipment and the different systems which cover the user equipment at the same time are respectively a UMTS system and an LTE system, or respectively the LTE system and the UMTS system;
the network element of the access network of the UMTS system is an RNC or a base station; and the network element of the access network of the LTE system is an evolution base station.
In the above scheme, the joint transmission request includes user equipment data transmission parameter information and target cell identification information participating in joint transmission.
In the foregoing solution, the radio resource at least includes one of: radio Network Temporary Identity (RNTI), scrambling code, random access parameter, and physical layer configuration parameter.
In the above scheme, the bearer establishment or reconfiguration signaling may reuse an existing RRC signaling or an RRC signaling carrying a radio resource allocated to the ue in each system.
In the above scheme, the radio resource allocated by the non-anchor network element to the user equipment in the system where the non-anchor network element is located includes a random access resource, and the user equipment initiates random access according to the random access resource to obtain uplink synchronization.
In the above scheme, the method further comprises: and after receiving the joint transmission response, the anchor point network element establishes a data transmission channel related to the user equipment with the non-anchor point network element.
In the above scheme, the data transmission channel includes 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 the access network element that receives the joint transmission request, and the user equipment merges the data packets respectively sent by the access network element that receives the joint transmission response and the access network element that receives the joint transmission request; and for the uplink, the user equipment distributes the data packet to the access network element receiving the joint transmission response and the access network element receiving the joint transmission request, and the access network element receiving the joint transmission response performs data packet combination.
In the above scheme, the method further comprises:
when the system which has established the RRC connection with the user equipment is a UMTS system, a Location Area Code (LAC), a Routing Area Code (RAC), and a Global Cell identity (CGI) of a Cell of the UMTS system to which the user equipment is accessed are non-access stratum (NAS) mobility information of the user equipment;
when the system that has established the RRC connection with the user equipment is an LTE system, a Tracking Area identifier (TAC) and a CGI of a cell of the LTE system to which the user equipment is accessed are NAS layer mobility information of the user equipment.
The invention provides a system for joint transmission, which comprises: the network comprises user equipment, an anchor point network element and a non-anchor point network element; wherein,
the anchor network element is used for sending a joint transmission request to a non-anchor network element; after receiving the joint transmission response, allocating wireless resources for the user equipment in the system in which the user equipment is located, and sending a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries the wireless resources allocated to the user equipment by the user equipment and the non-anchor point network element;
the non-anchor network element is used for allocating wireless resources to the user equipment in a system where the non-anchor network element is located after receiving the joint transmission request, and returning a joint transmission response carrying the allocated wireless resources;
and the user equipment is used for transmitting data across the system according to the acquired wireless resource after receiving the bearer establishment or reconfiguration signaling.
In the above scheme, the joint transmission request includes user equipment data transmission parameter information and target cell identification information participating in joint transmission;
the radio resources include at least one of: RNTI, scrambling codes, random access parameters and physical layer configuration parameters.
The invention provides an anchor point network element in a combined transmission system, which comprises: a joint transmission request module and a joint transmission establishing module; wherein,
the joint transmission request module is used for sending a joint transmission request to the non-anchor network element when determining that the user equipment needs to carry out joint transmission;
the joint transmission establishing module is used for allocating wireless resources for the user equipment in a system where the joint transmission establishing module is located after receiving a joint transmission response sent by the non-anchor point network element, and sending a bearing establishing or reconfiguring signaling to the user equipment through an RRC signaling; the joint transmission response carries the wireless resource distributed by the non-anchor network element for the user equipment in the system where the joint transmission response is located, and the bearer establishment or reconfiguration signaling carries the wireless resource distributed by the anchor network element and the non-anchor network element for the user equipment.
The invention provides a joint transmission method, a system and an anchor point network element, wherein the anchor point network element sends a joint transmission request to a non-anchor point network element; after receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates wireless resources to the user equipment in the system where the anchor network element is located, wherein the joint transmission response comprises the wireless resources allocated to the user equipment by the non-anchor network element in the system where the anchor network element is located; the anchor point network element sends a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries radio resources which are respectively allocated to the user equipment by the anchor point network element and the non-anchor point network element, so that the user equipment performs joint transmission according to the radio resources carried by the bearer establishment or reconfiguration signaling; therefore, cross-system combined transmission of user equipment data can be realized, the problem of RRC connection maintenance when the user equipment is simultaneously accessed into two systems is solved, and a second RRC connection does not need to be established. The scheme of the invention is beneficial to balancing the load among different systems on the network side and improving the data transmission rate of the user equipment.
Drawings
Fig. 1 is a schematic diagram of an architecture of a conventional third generation partnership project access system;
FIG. 2 is a flow chart illustrating a method for implementing a joint transmission according to the present invention;
fig. 3 is a flowchart illustrating a method for implementing joint transmission according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for implementing joint transmission according to a second embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for implementing joint transmission according to a third embodiment of the present invention.
Detailed Description
The basic idea of the invention is: the anchor point network element sends a joint transmission request to the non-anchor point network element; after receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates wireless resources to the user equipment in the system where the anchor network element is located, wherein the joint transmission response comprises the wireless resources allocated to the user equipment by the non-anchor network element in the system where the anchor network element is located; and the anchor point network element sends a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries the radio resources which are respectively allocated to the user equipment by the anchor point network element and the non-anchor point network element, so that the user equipment performs joint transmission according to the radio resources carried by the bearer establishment or reconfiguration signaling.
The invention is further described in detail below with reference to the figures and the specific embodiments.
The present invention realizes a method for joint transmission, as shown in fig. 2, the method includes the following steps:
step 101: when determining that the user equipment needs to perform joint transmission, the anchor point network element sends a joint transmission request to the non-anchor point network element;
the joint transmission request includes user equipment Data transmission parameter information, such as a quality of service parameter of a Data Radio Bearer (DRB), and target cell identification information participating in joint transmission.
Step 102: the non-anchor point network element which receives the joint transmission request distributes wireless resources for the user equipment in a system where the non-anchor point network element is located, and returns a joint transmission response carrying the distributed wireless resources;
specifically, the non-anchor network element that receives the joint transmission request allocates radio resources to the ue in its own system according to the ue data transmission parameter information in the joint transmission request and the target cell identification information participating in the joint transmission, so as to meet the ue data transmission requirement as much as possible, and carries the radio resources allocated to the ue in the returned joint transmission response, where the radio resources include at least one of the following: RNTI, scrambling codes, random access parameters, physical layer configuration parameters and the like.
Step 103: the anchor point network element receiving the joint transmission response allocates wireless resources for the user equipment in a system where the anchor point network element is located, and sends a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries the wireless resources allocated for the user equipment by the anchor point network element and the non-anchor point network element;
in this step, the Bearer establishment or Reconfiguration signaling may reuse an existing RRC signaling, such as Radio Bearer establishment (Radio Bearer Setup), Radio Bearer Reconfiguration (Radio Bearer Reconfiguration), or RRC Connection Reconfiguration (RRC Connection Reconfiguration), or may newly add an RRC signaling, where the RRC signaling carries Radio resources allocated to the user equipment in each system.
Step 104: after receiving the bearer establishment or reconfiguration signaling, the user equipment transmits data across systems according to the acquired wireless resources;
specifically, after receiving the bearer establishment or reconfiguration signaling, the ue transmits data through the system in which the anchor point network element and the non-anchor point network element are located, using the radio resource carried in the bearer establishment or reconfiguration signaling and allocated to the ue.
In this step, the radio resource allocated by the non-anchor network element to the user equipment may include a random access resource, the random access resource is allocated by the non-anchor network element and sent to the user equipment via the anchor network element, the user equipment initiates random access according to the random access resource to obtain uplink synchronization, and then the user equipment may implement uplink and downlink data transmission in a cell covered by a system in which the non-anchor network element is located.
Further, considering that when an operator lays out a network for joint transmission, in order to reduce the synchronization problem of the ue in different systems, the systems where the anchor network element and the non-anchor network element are located are deployed in a synchronization state, so that the ue automatically obtains synchronization with one system after obtaining synchronization with the other system, and at this time, in step 104, the radio resource allocated by the non-anchor network element for the ue may not include a random access resource.
Further, in the above scheme, after receiving the joint transmission response, the anchor network element establishes a data transmission channel related to the user equipment with the non-anchor network element, where the data transmission channel includes uplink and/or downlink, and for the downlink, the anchor network element distributes a data packet to the non-anchor network element, and the user equipment merges the data packets sent by the anchor network element and the non-anchor network element respectively; and for the uplink, the user equipment distributes the data packets to the anchor network element and the non-anchor network element, and the anchor network element performs data packet combination.
In this embodiment, the anchor point 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 element of a different system which simultaneously covers the user equipment; wherein, the different system is a system other than the system where the anchor point network element is located;
further, in the above scheme, when the system that has established RRC connection with the user equipment is a UMTS system, the LAC, RAC, and CGI of the UMTS system cell to which the user equipment is accessed are non-access stratum (NAS) mobility information of the user equipment;
when the system which has established RRC connection with the user equipment is an LTE system, the TAC and the CGI of the LTE system cell to which the user equipment accesses are NAS layer mobility information of the user equipment.
In order to implement the method, the invention also provides a system for joint transmission, which comprises: the network comprises user equipment, an anchor point network element and a non-anchor point network element; wherein,
the anchor point network element is an access network element of a system which establishes RRC connection with user equipment and is used for sending a joint transmission request to a non-anchor point network element when determining that the user equipment needs to perform joint transmission; after receiving the joint transmission response, allocating wireless resources for the user equipment in the system in which the user equipment is located, and sending a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries the wireless resources allocated to the user equipment by the user equipment and the non-anchor point network element;
the non-anchor network element is an access network element of a system covering the user equipment together with the system where the anchor network element is located, and is used for allocating wireless resources to the user equipment in the system where the non-anchor network element is located after receiving the joint transmission request and returning a joint transmission response carrying the allocated wireless resources;
the user equipment is used for transmitting data across systems according to the acquired wireless resources after receiving the bearer establishment or reconfiguration signaling;
the joint transmission request comprises user equipment data transmission parameter information and target cell identification information participating in joint transmission;
the radio resources include at least one of: RNTI, scrambling codes, random access parameters and physical layer configuration parameters;
the radio resource allocated by the non-anchor network element to the user equipment may include a random access resource, the user equipment initiates random access according to the random access resource to obtain uplink synchronization, and then the user equipment can realize transmission of uplink and downlink data in a cell covered by a system where the non-anchor network element is located;
further, the anchor network element includes: a joint transmission request module and a joint transmission establishing module; wherein,
the joint transmission request module is used for sending a joint transmission request to the non-anchor network element when determining that the user equipment needs to carry out joint transmission;
the joint transmission establishing module is used for allocating wireless resources for the user equipment in a system where the joint transmission establishing module is located after receiving a joint transmission response sent by the non-anchor point network element, and sending a bearing establishing or reconfiguring signaling to the user equipment through an RRC signaling; the joint transmission response carries the wireless resource distributed by the non-anchor network element for the user equipment in the system where the joint transmission response is located, and the bearer establishment or reconfiguration signaling carries the wireless resource distributed by the anchor network element and the non-anchor network element for the user equipment.
Based on the above system, the present invention further provides an anchor point network element in a joint transmission system, where the anchor point network element includes: a joint transmission request module and a joint transmission establishing module; wherein,
the joint transmission request module is used for sending a joint transmission request to the non-anchor network element when determining that the user equipment needs to carry out joint transmission;
the joint transmission establishing module is used for allocating wireless resources for the user equipment in a system where the joint transmission establishing module is located after receiving a joint transmission response sent by the non-anchor point network element, and sending a bearing establishing or reconfiguring signaling to the user equipment through an RRC signaling; the joint transmission response carries the wireless resource distributed by the non-anchor network element for the user equipment in the system where the joint transmission response is located, and the bearer establishment or reconfiguration signaling carries the wireless resource distributed by the anchor network element and the non-anchor network element for the user equipment.
The following detailed description of the implementation and principles of the method of the present invention is provided in connection with specific embodiments.
Example one
In this embodiment, the UE1 resides in a cell 1 managed by a base station 1 in the UMTS system, and is in an idle state, and the base station 1 is managed by an RNC. The cell 2 with the same coverage as the cell 1 is governed by the evolved node b2, and the evolved node b2 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 implement joint transmission with the enb 2 in LTE, a new interface is established between the RNC and the enb 2 for transferring data and control signaling. The interface establishment between the RNC and the enb 2 may be implemented by an Operation and Maintenance (Operation & Maintenance) server. The present embodiment implements a method for joint transmission, as shown in fig. 3, the method includes the following steps:
step 201, UE1 initiates random access in cell 1, and sends RRC connection request to RNC;
step 202, the RNC receives the connection request sent by the UE1, and returns an RRC connection setup (RRC ConnectionSetup) Signaling to the UE1, where the RRC connection setup Signaling includes configuration parameters of a Signaling Radio Bearer (SRB);
step 203, the UE1 sends an RRC Connection Setup Complete (RRC Connection Setup Complete) signaling to the RNC by using the configuration parameters of the SRB in the RRC Connection Setup signaling;
the RRC connection setup complete signaling also includes capability information of the UE1, i.e., capability information that the UE1 supports joint transmission.
To this end, the 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 signaling includes a non-access stratum signaling, that is, a service request; after receiving the initial direct transmission signaling, the RNC sends a service request to a core network;
step 205, after receiving the service Request and successfully authenticating the user equipment, the core network returns a Radio Access Bearer Assignment Request (Radio Access Bearer Assignment Request) to the RNC, where the Radio Access Bearer Assignment Request 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, and in this embodiment, the data transmission rate required by the DRB1 is very high, that is, the data rate included in the qos parameter is very high.
Step 206, the RNC detects that the radio resource of the cell 1 cannot meet the data transmission rate requirement of the DRB1, the RNC selects the cell 2 as a target cell participating in joint transmission, the RNC sends a joint transmission request to the evolved node b2 through an interface between the RNC and the evolved node b2, and the request includes the service quality parameter information of the DRB1 and the cell identification information of the cell 2;
in this step, the RNC can draw a conclusion that the cell 1 cannot meet the requirements of the DRB1 according to the radio resources used by the cell 1 and the radio resources occupied by the DRB 1.
The RNC may send measurement configuration to the UE1 to let the UE1 report the neighboring cell that meets the signal condition, and select the cell 2 as the target cell of the joint transmission according to the measurement report reported by the UE 1;
the present embodiment does not limit the signaling name used to indicate that the cross-system association transmission needs to be established.
Step 207, after receiving the joint transmission request, the enb 2 receives 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 the allocation includes at least one of the following: RNTI, scrambling code, random access parameter, physical layer configuration parameter, etc. in the cell 2;
step 208, after receiving the joint transmission response returned by the enb 2, the RNC allocates radio resources of the UE1 in the cell 1, and sends a bearer establishment signaling to the UE1 through an RRC signaling, where the bearer establishment signaling includes radio resources allocated by the RNC to the UE1 and radio resources allocated by the enb 2 to the UE 1;
the bearer establishment signaling may reuse an existing RRC signaling, such as radio bearer establishment, radio bearer reconfiguration, or RRC connection reconfiguration, or may newly add an RRC signaling, where the RRC signaling carries radio resources allocated to the user equipment in each joint transmission system.
Step 209, after receiving the bearer establishment signaling, UE1 applies the radio resource allocated by RNC therein for UE1 and the radio resource allocated by enodeb 2 for UE1, and transmits data through cell 1 and cell 2;
it should be noted that, in step 209, the UE1 receives the radio resource of the cell 2, which may include a random access resource, the random access resource is allocated by the base station 2 and sent to the UE1 via the RNC, the UE1 initiates a random access in the cell 2 according to the random access resource to obtain uplink synchronization, and then the UE1 may implement transmission of uplink and downlink data in the cell 2.
Considering that when an operator lays out a network for joint transmission, in order to reduce synchronization problems of the UE in different systems, the UMTS system and the LTE system are deployed in a synchronization state, that is, the UE1 automatically acquires synchronization with the LTE system after acquiring synchronization with the UMTS, so that the UE1 does not need to perform random access in the cell 2 to acquire uplink synchronization, and at this time, the radio resource allocated by the cell 2 to the UE1 may not include a random access resource.
Meanwhile, it should be noted that, after the RNC receives the joint transmission response returned by the enb 2, a data transmission channel related to the UE1 needs to be established between the RNC and the enb 2, where the data transmission channel includes uplink and/or downlink, and for the downlink, the RNC distributes part of downlink data packets of the UE1 to the enb 2, so that the enb 2 has sufficient downlink data transmission when communicating with the UE1, where the RNC needs to newly add a function of data distribution, selects part of data packets to send to the enb 2, and transmits the part of data packets to the UE1 through the enb 2. The UE1 merges the received data packets respectively sent by the RNC and the enb 2, and the UE1 may reuse the function of merging and recombining the existing Radio Link Control (Radio Link Control) to implement merging and recombining of the data packets, so that the application layer may still receive complete and ordered data packets. For the uplink, the data distribution function of the UE1 transmits part of the data packets in the UMTS system through the RNC, transmits the rest of the data packets in the LTE system through the enodeb 2, and the enodeb 2 forwards the data packets to the RNC after receiving the data packets, so that the RNC performs data packet merging and reassembly. Thus, the uplink data transmitted by the UE1 through the two systems can also be completely transmitted to the RNC and then transmitted to the core network through the RNC.
In this embodiment, although the UE1 employs the joint transmission, the UE1 only maintains RRC connection with the RNC, that is, only has one RRC connection, and does not establish a second RRC connection with the enb 2. RNC is anchor network element, and evolution base station 2 is non-anchor network element. The cells accessed by the UE1 include cell 1 and cell 2, but cell 2 is only a resource cell, or called a resource carrier, or called a secondary cell, of the UE 1. The LAC, RAC, and CGI broadcasted in the system message of cell 1 are non-Access Stratum (NAS) mobility information of the UE1, and the location information of the UE1 itself provided to the core network is the LAC, RAC, and CGI of cell 1. After the UE1 adopts the joint transmission mode, the system message of the cell 2 may change, but the UE1 does not need to monitor the paging message of the cell 2 to know that the system message of the cell 2 changes, when the system message of the cell 2 changes, the enodeb 2 sends the changed system message to the RNC, and the RNC sends the updated system message of the cell 2 to the UE1 through RRC signaling.
Example two
In this embodiment, the UE2 is in a connected state through the LTE system access network, and the UE2 accesses the cell 3 governed by the enodeb 3, that is, the enodeb 3 has already established an RRC connection for the UE 2. The base station 4 in the UMTS system is administered by RNC, and the coverage area of the cell 4 and the cell 3 which are administered by the base station 4 are overlapped.
The application scenario of this embodiment is as follows: the UE2 has established a DRB, denoted as DRB1 below. If the UE2 needs to newly create a DRB2 and the enodeb 3 does not have enough resources to meet the qos parameter requirement of the new DRB2 of the UE2, since the enodeb 3 already knows that the UE2 has the capability of supporting the joint transmission when the UE2 accesses the network, the enodeb 3 wants to use the joint transmission mode so that the UE2 can obtain more radio resources. The enb 3 learns that the signal quality of the cell 4 measured by the UE2 exceeds a predetermined threshold through a measurement report reported by the UE2, and the enb 3 needs to configure joint transmission for the UE 2. The method for joint transmission in this embodiment, as shown in fig. 4, includes the following steps:
step 301, the enodeb 3 sends a joint transmission request to the RNC through an interface between the enodeb and the RNC, where the joint transmission request includes the qos parameter information of the DRB2 and the cell id information of the cell 4;
step 302, after receiving the joint transmission request, the RNC receives the request, allocates the radio resource of the UE2 in the cell 4, and returns the allocated radio resource to the enb 3 through the joint transmission response, where the allocation includes at least one of the following: RNTI, scrambling code, random access parameter, physical layer configuration parameter and the like in the cell 4 or RNC;
in this step, the radio resource of the UE2 in the cell 4 is generally allocated according to the quality of service parameter of the DRB2, so as to meet the data transmission requirement of the DRB2 of the user equipment as much as possible.
Step 303, after receiving the joint transmission response returned by the RNC, the enodeb 3 allocates the radio resource of the UE2 in the cell 3, and sends a bearer establishment signaling to the UE2 through the RRC signaling, where the bearer establishment signaling includes the radio resource configured by the enodeb 3 for the UE2 and the radio resource configured by the RNC for the UE 2;
step 304, after receiving the bearer establishment signaling, the UE2 applies the radio resource configured by the enodeb 3 for the UE2 and the radio resource configured by the RNC for the UE2, and transmits data through the cell 3 and the cell 4;
so far, the network side configures a joint transmission mode for the DRB2 for the UE2, the UE2 can simultaneously use radio resources of the cell 3 and the cell 4 to transmit data of the DRB2, including uplink and downlink data, and the DRB1 established by the UE2 is still limited in the cell 3. Although the radio resource of the cell 3 cannot guarantee the requirement of the service quality parameter of the DRB2, the requirement of the service quality parameter of the DRB2 can be met by sharing part of the radio resource of the cell 4, thereby avoiding the problem that the evolved node b 3 can only reject the establishment request of the DRB2 after the requirement of the DRB2 cannot be met before the joint transmission is not introduced, and ensuring the satisfaction degree of the user.
In this embodiment, after the enb 3 receives the joint transmission response sent by the RNC, the method further includes: data transmission channels including uplink and/or downlink data transmission channels are established between the evolved node b 3 and the RNC with respect to the UE 2. For downlink, the enodeb 3 sends a part of downlink data packets of the UE2 to the RNC, so that the RNC has sufficient downlink data transmission when communicating with the UE2, where the enodeb 3 needs a new data distribution function, selects a part of data packets to send to the RNC, and transmits the part of data packets to the UE2 through the RNC. The UE2 merges the received data packets respectively sent from the RNC and the enb 3, and the UE2 may reuse the merging and recombining functions of the existing radio link control layer to implement merging and recombining of the data packets, so that the application layer may still receive complete and ordered data packets. For uplink, the enb 3 performs merging and reassembly of data packets, and then sends complete and ordered data packets to the core network.
In this embodiment, although the UE2 employs the joint transmission, the UE2 only maintains the RRC connection with the enodeb 3, and does not establish the second RRC connection with the RNC. The evolution base station 3 is an anchor point network element, and the RNC is a non-anchor point network element. The cell accessed by UE2 includes cell 3 and cell 4, but cell 4 is simply the resource cell for UE 2. The TAC and CGI broadcasted in the system message of the cell 3 are NAS layer mobility information of the UE2, and the location information of the UE2 itself provided to the core network is the TAC and CGI of the cell 3. In the LTE system, the security configuration parameter of the access layer of the ue is related to the frequency of the Cell to which the ue is accessed and the Physical Cell Identifier (PCI), and in this embodiment, the security configuration parameter used by the ue is only related to the Cell 3, that is, the security configuration parameter of the access layer of the ue is determined by the frequency of the Cell 3 and the PCI, and has no relation to the Cell 4.
Further, when the UE2 already uses the carrier aggregation technology in the LTE system, that is, when the UE2 accesses multiple cells in LTE at the same time, where a Cell providing the UE2 with the frequency and PCI required by the security configuration parameters is referred to as a Primary Cell (Primary Cell), when the enodeb 3 of the LTE system configures joint transmission for the UE2, the enodeb 3 may allocate radio resources of at least 2 cells governed by the enodeb 3 and serve the UE2 at the same time, and may fully utilize the spare resources in multiple cells to provide a high-rate requirement for the UE2, thereby achieving an effect of improving system capacity.
EXAMPLE III
In this embodiment, in the UMTS system, if the 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 UE1 is not in charge of the RNC, but is in charge of the base station, and for example, the spreading code used by the UE1, the time slot using the spreading code, and the like are controlled by the base station. In this embodiment, the base station of the LTE system uses a 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 at the same time, and therefore an interface is established between the enb 1 in the LTE system and the enb 2 in the UMTS system, and the interface is used for transmitting control signaling and data. The interface between the enb 1 and the enb 2 can be implemented by an operation and maintenance server, and generally, the operation and maintenance server establishes a direct interface for the enb 1 and the enb 2 according to the characteristic that coverage areas of cells within the jurisdiction thereof overlap.
The application scenario of this embodiment is as follows: the UE1 in the cell governed by the enb 1 has already established RRC connection and established a data radio bearer DRB1, however, due to the increase of user equipment in the cell governed by the enb 1, the load thereof also increases gradually, the enb 1 detects that the resources in the cell governed by the enb are in shortage, and wants to implement joint transmission with the UE1 by the enb 2, so that there are enough resources to meet the requirement of the quality of service parameter of the DRB1, and here, the enb 1 decides to perform joint transmission with the cell governed by the enb 2 according to the measurement report of the UE1 and the capability information of the UE 1. In this embodiment, as shown in fig. 5, the method for implementing joint transmission includes the following steps:
step 401: an evolution base station 1 sends a joint transmission request to a base station 2 through a direct interface, wherein the joint transmission request comprises a service quality parameter of a DRB1 and a cell identifier of a cell under the jurisdiction of the base station 2;
step 402: after receiving the joint transmission request, the base station 2 receives the request, allocates the radio resource of the UE1 in the cell under the jurisdiction of the base station 2, and returns the allocated radio resource to the enodeb 1 through the joint transmission response, where the radio resource at least includes one of the following: RNTI, scrambling codes, random access parameters, physical layer configuration parameters and the like;
step 403: after receiving the joint transmission response, the eNB 1 allocates radio resources of the UE1 in a cell under the jurisdiction of the eNB 1, and sends a bearer reconfiguration signaling to the UE1 through an RRC signaling, wherein the bearer reconfiguration signaling includes radio resources configured by the eNB 1 for the UE1 and radio resources configured by the eNB 2 for the UE 1;
the RRC signaling may be RRC connection reconfiguration signaling.
Step 404: after receiving the bearer reconfiguration signaling, the UE1 applies the radio resource configured by the enb 1 for the UE1 and the radio resource configured by the enb 2 for the UE1, and performs data transmission with the enb 1 and the enb 2 at the same time.
In this embodiment, although the UE1 employs the joint transmission, the UE1 only maintains the RRC connection with the enb 1, and does not establish the second RRC connection with the enb 2. The evolution base station 1 is an anchor point network element, and the base station 2 is a non-anchor point network element. The UE1 only utilizes the radio resources of the cell under the jurisdiction of the base station 2.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (13)
1. A method of joint transmission, the method comprising:
the anchor point network element sends a joint transmission request to the non-anchor point network element;
after receiving the joint transmission response sent by the non-anchor network element, the anchor network element allocates wireless resources to the user equipment in the system where the anchor network element is located, wherein the joint transmission response comprises the wireless resources allocated to the user equipment by the non-anchor network element in the system where the anchor network element is located;
the anchor point network element sends a bearer establishment or reconfiguration signaling to the user equipment through a Radio Resource Control (RRC) signaling, wherein the bearer establishment or reconfiguration signaling carries radio resources which are respectively allocated to the user equipment by the anchor point network element and the non-anchor point network element, so that the user equipment performs joint transmission according to the radio resources carried by the bearer establishment or reconfiguration signaling.
2. The method of 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; the non-anchor network element is an access network element of a different system which simultaneously covers the user equipment;
the system which establishes RRC connection with the user equipment and the heterogeneous system which simultaneously covers the user equipment are respectively a Universal Mobile Telecommunications System (UMTS) and a Long Term Evolution (LTE) system, or respectively the LTE system and the UMTS system;
the access network element of the UMTS system is a Radio Network Controller (RNC) or a base station; and the network element of the access network of the LTE system is an evolution base station.
3. The method of claim 2, wherein the joint transmission request comprises user equipment data transmission parameter information and target cell identification information participating in joint transmission.
4. The method of claim 2, wherein the radio resources comprise at least one of: a Radio Network Temporary Identifier (RNTI), a scrambling code, a random access parameter and a physical layer configuration parameter.
5. The method of claim 2, wherein the bearer establishment or reconfiguration signaling multiplexes existing RRC signaling or newly added RRC signaling carrying radio resources allocated for the ue in each system.
6. The method of claim 2, wherein the radio resource allocated by the non-anchor network element to the ue in its own system comprises a random access resource, and the ue initiates random access according to the random access resource to obtain uplink synchronization.
7. The method of claim 2, further comprising: and after receiving the joint transmission response, the anchor point network element establishes a data transmission channel related to the user equipment with the non-anchor point network element.
8. The method of 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 packets to the access network element that receives the joint transmission request, and the user equipment combines the data packets respectively sent by the access network element that receives the joint transmission response and the access network element that receives the joint transmission request; and for the uplink, the user equipment distributes the data packet to the access network element receiving the joint transmission response and the access network element receiving the joint transmission request, and the access network element receiving the joint transmission response performs data packet combination.
9. The method of claim 2, further comprising:
when the system which establishes RRC connection with the user equipment is a UMTS system, the Location Area Code (LAC), the Routing Area Code (RAC) and the global cell identity (CGI) of a cell of the UMTS system accessed by the user equipment are non-access stratum (NAS) mobile information of the user equipment;
when the system which has established RRC connection with the user equipment is an LTE system, a tracking area identifier (TAC) and a CGI of a cell of the LTE system to which the user equipment accesses are NAS layer mobility information of the user equipment.
10. A system for joint transmission, the system comprising: the network comprises user equipment, an anchor point network element and a non-anchor point network element; wherein,
the anchor network element is used for sending a joint transmission request to a non-anchor network element; after receiving the joint transmission response, allocating wireless resources for the user equipment in the system in which the user equipment is located, and sending a bearer establishment or reconfiguration signaling to the user equipment through an RRC signaling, wherein the bearer establishment or reconfiguration signaling carries the wireless resources allocated to the user equipment by the user equipment and the non-anchor point network element;
the non-anchor network element is used for allocating wireless resources to the user equipment in a system where the non-anchor network element is located after receiving the joint transmission request, and returning a joint transmission response carrying the allocated wireless resources;
and the user equipment is used for transmitting data across the system according to the acquired wireless resource after receiving the bearer establishment or reconfiguration signaling.
11. The system of claim 10, wherein the joint transmission request comprises user equipment data transmission parameter information and target cell identification information participating in joint transmission;
the radio resources include at least one of: RNTI, scrambling codes, random access parameters and physical layer configuration parameters.
12. The system of claim 10, wherein the anchor network element comprises: a joint transmission request module and a joint transmission establishing module; wherein,
the joint transmission request module is used for sending a joint transmission request to the non-anchor network element when determining that the user equipment needs to carry out joint transmission;
the joint transmission establishing module is used for allocating wireless resources for the user equipment in a system where the joint transmission establishing module is located after receiving a joint transmission response sent by the non-anchor point network element, and sending a bearing establishing or reconfiguring signaling to the user equipment through an RRC signaling; the joint transmission response carries the wireless resource distributed by the non-anchor network element for the user equipment in the system where the joint transmission response is located, and the bearer establishment or reconfiguration signaling carries the wireless resource distributed by the anchor network element and the non-anchor network element for the user equipment.
13. An anchor point network element in a joint transmission system, the anchor point network element comprising: a joint transmission request module and a joint transmission establishing module; wherein,
the joint transmission request module is used for sending a joint transmission request to the non-anchor network element when determining that the user equipment needs to carry out joint transmission;
the joint transmission establishing module is used for allocating wireless resources for the user equipment in a system where the joint transmission establishing module is located after receiving a joint transmission response sent by the non-anchor point network element, and sending a bearing establishing or reconfiguring signaling to the user equipment through an RRC signaling; the joint transmission response carries the wireless resource distributed by the non-anchor network element for the user equipment in the system where the joint transmission response is located, and the bearer establishment or reconfiguration signaling carries the wireless resource distributed by the anchor network element and the non-anchor network element for the user equipment.
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| CN201110171449.0A CN102843723B (en) | 2011-06-23 | 2011-06-23 | A kind of method of joint transmission, system and anchor point network element |
| PCT/CN2012/072757 WO2012174903A1 (en) | 2011-06-23 | 2012-03-21 | Method, system and anchor network element for joint transmission |
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| WO2015070374A1 (en) * | 2013-11-12 | 2015-05-21 | 华为技术有限公司 | Carrier aggregation method and base station |
| EP3335472B1 (en) * | 2015-08-14 | 2019-05-15 | Telefonaktiebolaget LM Ericsson (PUBL) | System information broadcasting in a wireless network |
| EP3461217B1 (en) | 2016-07-29 | 2021-09-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for establishing secondary connection |
| JP7073511B2 (en) * | 2018-02-12 | 2022-05-23 | 華為技術有限公司 | Communication method, communication device, and computer program storage medium |
| CN116887441A (en) * | 2022-03-28 | 2023-10-13 | 展讯通信（上海）有限公司 | Random access method, equipment and storage medium |
| CN117479334A (en) * | 2022-07-18 | 2024-01-30 | 展讯半导体(南京)有限公司 | Random access method and device and computer readable storage medium |
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| CN101932111A (en) * | 2009-06-26 | 2010-12-29 | 中兴通讯股份有限公司 | Method and system for resource scheduling between enhanced base stations |
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