CN102595499B

CN102595499B - A kind of UE sets up the method for mixing carrying in multiple community

Info

Publication number: CN102595499B
Application number: CN201110004795.XA
Authority: CN
Inventors: 陈晔; 樊荣; 李磊
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2011-01-11
Filing date: 2011-01-11
Publication date: 2015-08-12
Anticipated expiration: 2031-01-11
Also published as: WO2012094940A1; CN102595499A

Abstract

The invention provides a kind of UE sets up mixing carrying method in multiple community, the method comprises: after user equipment (UE) enters collaborative multicast communication CoMP cell collection, and the packet-based core networks EPC of evolution initiates to strengthen RAB E-RAB to host cell carries receiving request message; The carrying acceptance judging in CoMP cell collection is carried out in host cell, when not having sufficient resources to transmit E-RAB carrying in host cell, E-RAB is corresponded on the Data Radio Bearer DRB in host cell and at least one auxiliary community, jointly E-RAB is carried by many DRB in CoMP cell collection and transmit.Adopt technical scheme of the present invention, increase the covering of high data rate, again can at the beginning of carrying is set up just by load balancing in each community, realize the throughput of load balancing, raising cell edge and system.

Description

Method for UE to establish mixed load in multiple cells

Technical Field

The present invention relates to the field of wireless communication, and more particularly, to a method for establishing a hybrid bearer in multiple cells by a user equipment UE.

Background

An EPS (Evolved Packet System) is composed of LTE (Long term evolution), also called E-UTRAN (Evolved Universal radio access Network), and EPC (Evolved Packet Core). In order to implement end-to-end QoS, bearer services with well-defined attributes and functions are established and used in the EPS system from a service start point to a service end point, as shown in fig. 1, which is an architecture diagram of an EPS bearer service in an LTE system, where an E-UTRAN includes a UE (user equipment) and an eNB (evolved NodeB), and generally, one eNB constitutes one cell; the corresponding EPC comprises an S-GW (Service-Gateway) and a P-GW (Packet-Gateway); the P-GW is connected with the Internet through a Gi interface. Wherein,

the EPS bearer service architecture continues to use a QoS framework structure similar to that of the UMTS network, i.e., a hierarchical and zoned QoS architecture, that is, the bearer service of each layer is provided by the bearer service of the next layer. The End-to-End service (End to End service) can be split into two parts: EPS Bearer service (EPS Bearer) and External Bearer service (External Bearer). The external bearer service is used for connecting the UMTS core network and the service bearer between external network nodes. The EPS Bearer service can be divided into an EPS Radio Bearer service (E-RAB) and S5/S8 Bearer, where the E-RAB includes a Radio Bearer service (Radio Bearer) and S1Bearer (S1Bearer), where the Radio Bearer service enables transmission of EPS Bearer service data units between the eNB and the UE, and the S1Bearer enables transmission of EPS Bearer service data units between the S-GW and the eNB

In the LTE system, only one cell serves a certain UE at a time, and the service bearer of the UE can only be established in the serving cell. When establishing the Bearer, the E-RAB Bearer and the Radio Bearer and the s1Bearer are in one-to-one correspondence.

CoMP (Coordinated Multi-point transmission/reception) technology refers to that multiple transmission points separated from each other in a geographical location cooperate to participate in transmission and/or reception of data by one UE, so as to improve the quality of signals received by edge users. Applying the CoMP technology in an LTE-a (Long Term Evolution-Advanced) system to increase the coverage of high-speed data rate, improve the throughput at the cell edge, and/or increase the system throughput is a problem that needs to be solved urgently.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for establishing a hybrid bearer in a plurality of cells by UE.

The method for establishing the hybrid bearer in the plurality of cells by the UE adopts the following technical scheme:

a method for a UE to establish a hybrid bearer in multiple cells, the method comprising:

after User Equipment (UE) enters a coordinated multi-point transmission CoMP cell set, an evolved packet core network (EPC) initiates an enhanced radio access bearer (E-RAB) bearer admission request message to a master cell;

and after receiving the E-RAB bearer admission request message, the master control cell makes bearer admission judgment in the CoMP cell set, and when the master control cell does not have sufficient resources to transmit the E-RAB bearer, the master control cell corresponds the E-RAB to Data Radio Bearers (DRBs) in the master control cell and at least one auxiliary cell, and a plurality of DRBs in the CoMP cell set transmit the E-RAB bearer together.

Further, in the above method, before the UE enters the CoMP cell set, the method further includes:

and the master control cell acquires the resource and load information of other cells in the CoMP cell set through an X2 interface.

Further, in the above method, when making a bearer admission decision in the CoMP cell set, the method further includes:

determining that the total residual resources which can be provided by all cells in the CoMP cell set are greater than the resources required by E-RAB bearer, and if so, successfully admitting; otherwise, the admission fails;

and after the main control cell finishes bearing admission judgment, sending a judgment result to the EPC in an E-RAB admission success response message.

Further, in the above method, corresponding the E-RAB to the DRBs in the primary cell and the at least one secondary cell, and transmitting the E-RAB bearer by the multiple DRBs in the CoMP set in common specifically includes:

the master control cell establishes an S1bearer between the master control cell and the EPC through an S1bearer establishment request message;

the main control cell establishes a radio bearer between the UE and the main control cell through a radio bearer establishment request message;

the main control cell sends an X2 interface E-RAB establishment request message to other auxiliary cells needing to establish DRB in the CoMP cell set through an X2 interface, and indicates the auxiliary cells to establish DRB and S1 load;

and after receiving the E-RAB establishment request message sent by the main control cell, the secondary cell establishes an S1bearer between the secondary cell and the EPC through an S1bearer establishment request message, and establishes a radio bearer between the UE and the secondary cell through a radio bearer establishment request message.

Further, in the above method, each cell in the CoMP cell set maintains a mapping relationship between an E-RAB and a radio bearer and an S1bearer inside the cell;

UE traffic data on the E-RAB is transported from the EPC to the UE through S1bearer and DRB.

The invention provides another method for establishing a hybrid bearer in a plurality of cells by UE, which comprises the following steps:

after the UE enters the CoMP cell set, the main control cell judges whether the load established by the UE needs to be re-admitted and distributed in the CoMP cell set again;

splitting a bearer admitted in a master control cell into a plurality of bearers, wherein an E-RAB bearer corresponds to a plurality of radio bearers distributed in each cell in a CoMP cell set; or combining different E-ARB bearers in a plurality of cells into the same radio bearer in a certain cell, wherein the E-RAB bearers correspond to the same radio bearer in each cell in the CoMP cell set.

In the above method, before the UE enters the CoMP cell set, the method further includes:

In the above method, the specific steps of the main control cell re-judging whether the bearer established by the UE needs to be re-admitted and distributed in the CoMP cell set are:

and the main control cell receives and distributes the load established by the UE in the CoMP cell set again according to the resource information, the load information and the resources required by the load of each cell in the CoMP cell set.

In the above method, the E-RAB bearers correspond to a plurality of radio bearers distributed in each cell in the CoMP cell set, or the E-ARB bearers originally different in a plurality of cells are combined into the same radio bearer in a certain cell:

the master control cell sends a radio bearer modification request to the UE to modify the established radio bearer between the UE and the master control cell;

the main control cell sends an E-RAB establishment request or an E-RAB modification request to at least one auxiliary cell through an X2 interface, and indicates other cells in the load CoMP cell set to establish or modify DRB and S1 load according to the decision result of load splitting or merging of the main control cell;

after receiving the E-RAB establishment request message sent by the master control cell, the secondary cell establishes or modifies S1bearer between the secondary cell and the EPC through an S1bearer establishment request message or an S1bearer modification request message; and establishing or modifying the radio bearer between the UE and the secondary cell through the radio bearer establishment request message or the radio bearer modification request message.

Further, in the above method, each cell in the CoMP cell set updates the mapping relationship between the E-RAB and the radio bearer and between the E-RAB and the S1bearer inside the cell;

UE traffic data on the E-RAB is transmitted from the EPC to the UE through the updated S1bearer and DRB.

By adopting the technical scheme of the invention, according to the characteristic that a plurality of cells serve the same UE in the CoMP technology, the mixed bearer is flexibly established, the gain brought by the CoMP technology is fully utilized, the coverage of high-speed data rate is increased, the load can be balanced in each cell at the beginning of establishing the bearer, the load balance is realized, and the cell edge and the throughput of the system are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is an EPS bearer service architecture diagram in an LTE system;

fig. 2 is a diagram of a hybrid EPS bearer service architecture in an LTE-a system;

fig. 3 is a flowchart of UE establishing a hybrid bearer based on CoMP in the present invention;

fig. 4 is a flow chart of dedicated bearer splitting/merging of a UE based on a CoMP cell set in the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 2 is a diagram of a hybrid EPS Bearer service architecture in an LTE-a system, where as shown in fig. 2, a plurality of enbs form a CoMP cell set (each eNB is regarded as a cell), a UE establishes a Radio Bearer with the plurality of enbs, one E-RAB Bearer may correspond to a plurality of Radio bearers distributed in a plurality of different cells, and a plurality of S1 bearers are established between the eNB and the S-GW that establish the Radio Bearer with the UE.

Embodiment 1, in an LTE-a system, when an E-RAB service is newly established, radio bearers in a plurality of different cells are established.

Fig. 3 is a flowchart of UE establishing a hybrid bearer based on CoMP in the present invention. As shown in fig. 3, when an E-RAB service is newly established, the procedure for establishing a plurality of Radio bearers in different cells is as follows:

s301, the main control cell acquires the resource and load information of other cells in the CoMP cell set through an X2 interface, wherein the X2 interface is an interface between eNBs;

s302, after UE enters a CoMP cell set, EPC sends an E-RAB bearer admission request message to a master control cell, the carried main cells comprise E-RAB bearer identifiers and E-RAB related quality of service (Qos) information, and the guaranteed bit rate GBR service comprises information such as QCI (quality of service Identifier, QoS level Identifier) and GBR, maximum bit rate MBR and the like;

and S303, after receiving the E-RAB bearer admission request message, the main control cell carries out bearer admission judgment in the CoMP cell set. The main control cell considers the gain which can be obtained by adopting the CoMP technology according to the resource information of each cell in the CoMP cell set mastered by the main control cell, comprehensively evaluates, and successfully admits if the total residual resources which can be provided by all the cells in the whole CoMP cell set are determined to be larger than the resources required by E-RAB bearing, otherwise, the admission fails; when accepting the judgment, the main control cell considers the distribution of the E-RAB Bearer in the whole CoMP cell set according to the load condition of each cell, if the main control cell has sufficient resources, the transmission of the E-RAB Bearer can be ensured, the E-RAB can be corresponding to one DRB (Data Radio Bearer) in the main control cell, otherwise, the E-RAB can be corresponding to the DRBs in the main control cell and the auxiliary cells by utilizing the CoMP technology, and the transmission of the E-RAB Bearer is ensured by a plurality of DRBs in the CoMP set together; the basic principle of bearer admission and allocation is to ensure that the basic Qos of an E-RAB bearer is ensured in the cells of the whole Comp set, and each cell in the Comp set realizes load sharing and load balancing;

s304, after the main control cell completes the admission judgment and the bearer allocation, the admission and allocation result is sent to the EPC by an E-RAB admission success response message;

s305, the main control cell sends an S1Beaer establishment request message to the EPC;

and S306, after receiving the S1Beaer establishment request message, the EPC sends an S1Beaer establishment success response message to the main control cell, and establishes the S1Beaer between the main control cell and the EPC.

S307, the main control cell sends a Radio Bearer establishment request message to the UE;

s308, after receiving the Radio Bearer establishment request message, the UE returns a Radio Bearer establishment success response message, and establishes the Radio Bearer between the UE and the main control cell;

s309, the main control cell sends an X2 interface E-AB establishment request message to other auxiliary cells needing to establish DRB in the CoMP set through an X2 interface, and indicates the auxiliary cells to establish DRB and S1 Bearer;

s310, the auxiliary cell returns E-RAB establishment success response after receiving the E-RAB establishment request message sent by the main control cell;

s311, the auxiliary cell establishes an S1Bearer between the auxiliary cell and the EPC through the S1Bearer establishment request message;

s312, the EPC returns an S1Beaer establishment success response to the secondary cell;

s313, the auxiliary cell sends a Radio Bearer establishment request message to the UE, and a Radio Bearer is established between the UE and the auxiliary cell;

s314, the UE returns a Radio Bearer establishment success response to the secondary cell;

s315, each cell in the CoMP set maintains the mapping relation between the E-RAB and the Radio Bearer and the S1Beaer in the cell;

at S316, UE traffic data on the E-RAB is transmitted from the EPC to the UE via S1Beaer and DRB.

Embodiment 2, in the LTE-A system, the E-RAB which is already established is split and reallocated.

As shown in fig. 4, a dedicated bearer splitting/merging flow chart of the UE based on CoMP in the present invention is as follows:

s401, the main control cell acquires the resource and load information of other cells in the CoMP set through an X2 interface;

s402, after the UE enters the CoMP cell set, reconsidering whether the bearer that the UE has established needs to be re-admitted and distributed in the CoMP cell. The main control cell readjusts the distribution of the load in the CoMP cell set according to the resource information, the load information and the load required by the load of each cell in the CoMP set, which are mastered by the main control cell, by considering the gain which can be obtained by adopting the CoMP technology; one Bearer admitted in the original main control cell can be split into a plurality of bearers to be reestablished to each cell in the CoMP cell set, so that one E-RAB Bearer can correspond to a plurality of Radio Bearer distributed in each cell in the CoMP cell set; or combining the different E-ARB bearers in the two cells into the same Radio Bearer in a certain cell, so that a plurality of E-RAB bearers correspond to the same Radio Bearer in each cell in the CoMP cell set. Balancing the load in each cell of the CoMP by merging and splitting the established load; the principle of bearer splitting and merging is to ensure that the basic Qos of one E-RAB bearer is ensured in the whole cell of the CoMP set, and each cell in the CoMP set realizes load sharing and load balancing.

S403, the main control cell sends a Radio Bearer modification request message to the UE;

s404, after receiving the Radio Bearer modification request message, the UE returns a Radio Bearer modification request response message, and modifies the established Radio Bearer between the UE and the main control cell;

and S405, the main control cell establishes a request or an E-RAB modification request to an X2 interface E-RAB, and instructs other cells in the load CoMP set to establish or modify a DRB and an S1Beaer according to the decision result of load splitting and merging of the main control cell.

S406, the auxiliary cell returns E-RAB establishment request response after receiving the E-RAB establishment request message sent by the main control cell;

s407, building a request message (or S1Beaer modify request message) by S1 Beaer;

s408, the EPC returns an S1Beaer establishment success message (S1 Beaer modification success message), and an S1Beaer is established (or modified) between the secondary cell and the EPC;

s409, establishing a request message (or a Radio Bearer modification request message) through a Radio Bearer;

s410, the UE returns a Radio Bearer establishment request response message (Radio Bearer modification request response message), and establishes (or modifies) the Radio Bearer between the UE and the attached cell;

s411, each cell in the CoMP set updates the mapping relation between the E-RAB and the Radio Bearer and between the E-RAB and the S1Beaer in the cell;

and S412, transmitting the UE service data on the E-RAB from the EPC to the UE through the updated S1Beaer and DRB.

While the foregoing description shows and describes a preferred embodiment of the invention, it is to be understood, as noted above, that the invention is not limited to the form disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and may be modified within the scope of the inventive concept described herein by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A method for a UE to establish a hybrid bearer in multiple cells, the method comprising:

after receiving the E-RAB bearer admission request message, the master control cell makes bearer admission judgment in the CoMP cell set, and when the master control cell does not have sufficient resources to transmit the E-RAB bearer, the E-RAB is corresponding to Data Radio Bearers (DRBs) in the master control cell and at least one auxiliary cell, and a plurality of DRBs in the CoMP cell set transmit the E-RAB bearer together;

wherein, corresponding the E-RAB to the DRBs in the main control cell and the at least one secondary cell, and transmitting the E-RAB bearer by the DRBs in the CoMP set together specifically includes:

the master control cell establishes a radio bearer between the UE and the master control cell through the radio bearer establishment request message;

2. The method of claim 1, wherein before the UE enters the CoMP cell set, the method further comprises:

3. The method of claim 1, wherein when making bearer admission decisions within a CoMP cell set, the method further comprises:

4. The method of claim 1, further comprising:

each cell in the CoMP cell set maintains the mapping relation between the E-RAB and the radio bearer and between the E-RAB and the S1bearer in the cell;

5. A method for a UE to establish a hybrid bearer in multiple cells, the method comprising:

after the UE enters the coordinated multi-point transmission CoMP cell set, the main control cell judges whether the load established by the UE needs to be re-admitted and distributed in the CoMP cell set again;

splitting a bearer admitted in a master control cell into a plurality of bearers, wherein an enhanced radio access bearer E-RAB bearer corresponds to a plurality of radio bearers distributed in each cell in a CoMP cell set; or combining different E-RAB bearers in a plurality of cells into the same radio bearer in a certain cell, wherein the E-RAB bearers correspond to the same radio bearer in each cell in the CoMP cell set;

wherein, the E-RAB bearers correspond to a plurality of radio bearers distributed in each cell in the CoMP cell set or merge the originally different E-RAB bearers in a plurality of cells into the same radio bearer in a certain cell:

6. The method of claim 5, wherein before the UE enters the CoMP cell set, the method further comprises:

7. The method according to claim 5, wherein the step of the master cell re-determining that the bearer established by the UE needs to be re-admitted and distributed in the CoMP cell set specifically comprises:

8. The method of claim 5, further comprising:

each cell in the CoMP cell set updates the mapping relation between the E-RAB and the radio bearer and between the E-RAB and the S1bearer inside the cell;