INFORMATION SWITCH NOTIFICATION AND BASE STATION NOTIFICATION METHOD

专利摘要:
information change notification method and base station. The present invention provides an information change notification method and a base station. the method comprises: a source base station that changes a user equipment (ue) to a target pccell of a target base station; and the source base station which notifies the target base station of the signal quality of the target pccell. The present invention ensures that the target base station can efficiently select secondary serving cells according to the transmitted information, reduces time delay.
公开号:BR112013007367B1
申请号:R112013007367-5
申请日:2011-03-21
公开日:2022-01-11
发明作者:Zhongming Chen；Yada Huang
申请人:Zte Corporation；
IPC主号:

专利说明:

Field of Invention
The present invention relates to the field of communication, in particular to an information switching notification method and a base station. Background of the Invention
In the mobile communication system, in order to ensure the quality of service and provide excellent service experience for users, after the user equipment (UE) has established internet connection in a certain cell, the UE still needs to measure the qualities of the signal from the service cell and neighboring cells and select the appropriate cell to make the change so that the mobility requirements can be met.
Figurai is a schematic drawing of the X2 interface change process according to correlative technology. As shown in Figurei, in the long-term evolution (LTE) system, the process of changing the X2 interface comprises the steps as follows:
Step 101, the source base station sends a measurement control message to the UE in the connection state;
Step 102, the UE performs the measurement and submits the measurement report;
Step 103, the source base station determines to carry out the change and selects the target cell according to the received measurement report and in connection with practical situations;
Step 104, the source base station sends a change request message to the target base station to which the target cell belongs, in which the change request message carries the UE capability information, the configuration information of a server layer application (AS), radio resource control (RRM) configuration information, and context information;
Step 105, after performing resource reservation processing, a target base station responds to the change of the request response message to the source base station, in which the change of the request response message leads to the change of the command information to the source base station. HUH. Command information switching comprises target cell information (the target cell may be different from the target cell in the change request message);
Step 106, the source base station sends the command change (namely, RRC reconfiguration) to the UE;
Step 107, after completion of random access in the target cell, the UE sends a completion command change to the target base station.
The S1 interface change process is similar to the X2 interface change process, except that the intercom messages during the change are sent by the MME.
The main basis on which the source base station makes the change decision is the measurement result. In the LTE system in the connection state, the specific measurement process is as follows: the network side sends the measurement control message to the UE, in which the measurement control message carries measurement identification (MID), object of the measurement (MO), report configuration (RC), and the other related measurement attributes. Measurement identification correlates to MO and RC to form a total measurement task. The MO comprises the attributes (eg conveyor, neighboring cell lists, etc.) of the measurement object. Each conveyor is configured with only one measurement object. The CR comprises the attributes (eg event activation or periodic report, definitions (A1, A2...) of activated events, reporting times, etc.) of the report configuration. The UE performs measurement and evaluation according to the MO and RC in the measurement control message, generates a measurement report according to the measurement result, and submits the measurement report to the network side. The network side decides whether to carry out the 5 change according to the measurement report submitted by the UE.
In LTE, some key mobility parameters can be negotiated between base stations (referred to as base station 1 and base station 2 hereafter). Figure 2 is a schematic drawing of the process of negotiating mobility parameters according to a correlative technology. A negotiation of mobility parameters is carried out through the steps as follows: base station 1 sends a request for » change of mobility parameter to base station 2; if base station 2 accepts the change, base station 2 responds to a mobility parameter change response to base station 1.
Figure 3 is a schematic drawing of the X2 interface organization process between base stations according to correlative technology. As shown in Figure 3, the base station sends an organization request X2 to the base station 2; and base station 2 responds to an organization response X2 to base station 1.
In order to provide higher data rate for mobile users, the long-term evolution advancement system (LET-A) puts forward a carrier aggregation (CA) technology, with the purpose of providing wider bandwidth for the UE with corresponding capabilities, and optimizes the peak rate of the UE. In LTE, the maximum downlink transmission bandwidth supported by the system is 20MHz. CA refers to technology that aggregates two or a plurality of component carriers (CC) to support transmission bandwidths greater than 20MHz and no more than 100MHz at the maximum. The LTE-A
UEs with carrier aggregation capability can send and receive data on a plurality of component carriers. The UE referred to hereinafter refers to LTE-A UE with carrier aggregation capability, except in exceptional circumstances. In the LTE-A system, after entering the link state, the UE can communicate with the source base station through a plurality of component carriers (eg CC1, CC2) at the same time. The base station will designate a primary component conveyor (PCC) through explicit configuration, or in accordance with the protocol agreement, and the other component conveyors are referred to as secondary component conveyors (SCC). The service cell in the DL PCC is called the primary cell (Pcell), and the service cell in the DL SCC is called the secondary cell (Scell).
The change process in LTE-A is the same as the change process in LTE. The source base station sends the measurement control message to the UE in link state; the UE performs the measurement, and submits the measurement report; the source base station determines to carry out the change and selects the target PCell according to the received measurement report, and in connection with practical situations; the source base station sends the change request message to the target base station to which the target PCell belongs, in which the change request message carries the UE capability information, the AS layer configuration information, the information RRM configuration, and context information; after performing resource reservation processing, the target base station responds to the change of the request response message to the source base station, wherein the change of the request response message leads to the switching of command information to the UE; the change command information comprises the target Pcell information (the target Pcell may be different from the target Pcell in the change request message), and may also comprise one or a plurality of Scells; the UE receives the command change (called RRC reconfiguration) from the source base station; after the random access padding on the target PCell, the UE sends the padding command change to the target base station.
In order to cooperate with the target base station to configure one or a plurality of Scells, the change request message sent to the target base station by the source base station also carries an optimal cell list, and the signal quality of the cells ( for example, power received by the reference signal (RSRP) and quality received by the reference signal (RSRQ)). The cells in the list are non-service cells that are sequenced in descending order according to wireless signal quality (ie, the optimal cell is sequenced first).
Aiming at each frequency, the source base station selects at least one optimal cell from the available measurement report to form the optimal cell list. The target base station can configure the Scell for the UE according to the list. As a course subject, the configured Scell cannot be the cells in the list.
As seen in the above-mentioned description, in correlative technologies, after completing the cell change decision making process, the source base station transmits the signal quality of the supporting Scells to the target base station through the optimal cell list that provides basis for target base station to select Scells. However, in the present processing mode, the target base station can only acquire the signal quality of the supporting Scells notified by the source base station, or the cells in the optimal cell list are comparatively unsorted, with the result that the judgment accuracy of Scells is influenced, and the processing complexity of the target base station is increased. Summary of the present invention
The present invention mainly aims to provide a method of notifying switching information and a base station to at least solve the above-mentioned problems.
The present invention provides a method of notifying switching information in accordance with an aspect of the present invention. The method comprises: changing the source base station of a user equipment (UE) to a target PCcell of a target base station; and the source base station notifying the target base station of the signal quality of the target PCell.
Preferably, the step of the source base station notifying the target base station of the signal quality of the target Pcell additionally includes: the source base station including the signal quality v of the target Pcell in an optimal cell list, and sending the cell list great for target base station; or the source base station including the signal quality of the target PCell in a predefined information cell instead of the optimal cell list, and sending the predefined information cell to the target base station.
Preferably, the signal quality comprises at least one of energy received by the reference signal (RSRP) and the quality received by the reference signal (RSRQ).
Preferably, before the source base station notifies the target base station of the signal quality of the target PCell, the method further comprises: the source base station negotiates with the target base station whether or not to transmit an optimal cell list, or, 25 to source base station determines whether or not it transmits the optimal cell list based on whether or not the UE supports carrier aggregation, or whether or not there is only one cell operating the UE; proceeding to the next step if it determines to transmit the optimal cell list, and terminating the notification if it determines not to transmit the optimal cell list.
The present invention provides a method of notifying switching information in accordance with another aspect of the present invention. The method comprises: a source base station arranging cells in an optimal cell list according to a predefined signal quality, wherein the predefined signal quality includes one of RSRP and RSRQ; and the source base station notifying a target base station of the optimal cell list.
Preferably, each cell in the optimal cell list meets a predefined condition, and the predefined condition includes: the predefined signal quality of a secondary supporting cell (Scell) £ (the predefined signal quality of a target Pcell identified by the source base station - a predefined compensation).
Preferably, if the source base station identifies a plurality of target Pcells, the predefined condition includes: the predefined signal quality of the supporting Scell (the predefined signal quality of a predefined target Pcell - a predefined offset), in which the target Pcell includes one or more of the following: a target Pcell with a predefined optimal signal quality among the plurality of target Pcells, a target Pcell with a worst predefined signal quality among the plurality of target Pcells, and an arbitrary target Pcell of the plurality of targets. target pc.
The optimal cell list configuration information is determined by a protocol, or is determined through a negotiation between the source base station and the target base station, in which the configuration information includes at least one of the following: default offset, quality predefined signal, and a maximum number of cells in the optimal cell list.
Preferably, the step of the source base station that negotiates configuration information with the target base station additionally includes: a group of the source base station and the target base station including the configuration information of a group in an organization request, and send the organization request for the other group of the source base station and the target base station during an organization process of an interface S1, or an interface X2; and the other group returning an organization response that includes the other group's configuration information.
Preferably, the step of the source base station negotiating configuration information with the target base station additionally includes: a group of the source base station and the target base station notifying the configuration information to the other group of the source base station and the target base station via a mobility parameter change request message; and the other group returning a mobility parameter change response message including information indicating agreement or not including any information whether the other group agrees with i the configuration information, or the other group returning a parameter change failure message of mobility or a mobility parameter change response message including the configuration information of the other group if the other group disagrees with the configuration information.
Preferably, prior to the step of the source base station arranging the cells in the optimal cell list according to the predefined signal quality, the method further comprises: the source base station negotiating with the target base station whether or not to transmit an optimal cell list , or, the source base station determining whether or not transmits the optimal cell list based on whether or not a currently altered UE supports carrier aggregation, or whether or not there is any only one cell operating the UE; proceeding to the next step if it determines to transmit the optimal cell list; and terminating the notification if it determines not to broadcast the optimal cell list.
Preferably, an optimal cell that does not have a predefined signal quality measurement result at a frequency is not added to the optimal cell list, or is added to the end of the optimal cell list.
The present invention provides a base station in accordance with another aspect of the present invention. The base station comprises: a change determination module, configured to change a user equipment to a target PCcell of a target base station; and a notification module, configured to notify the target base station of the signal quality of the target PCell.
The present invention provides a base station in accordance with another aspect of the present invention. The base station comprises: a sorting module, configured to sort cells in an optimal cell list according to a predefined signal quality, wherein the predefined signal quality includes one of RSRP and RSRQ; and a notification module, configured to notify the target base station of the optimal cell list.
By virtue of the present invention, the source base station notifies the target Pcell's quality of service to the target base station, or notifies the target base station of supporting Scells that it meets the predefined compensation conditions. The present invention solves the problems in current technologies that Scell determination is imprecise and the target base station has to negotiate with more complex results due to the fact that the target base station receives less commutation of sufficient or organized information, ensuring that the target side can effectively select Scells according to transmitted information, and reduce time delay. Brief Description of Drawings
The drawings in the specification provide further understanding of the present invention, and form a part of the application. Exemplary embodiments of the present invention and the explanation thereof are given hereinafter by way of illustration only, and thus are not limitative of the present invention, and in which:
Figure 1 is a schematic drawing of the X2 interface change process according to the correlative technology;
Figure 2 is a schematic drawing of the mobility parameters negotiation process according to the correlative technology;
Figure 3 is a schematic drawing of X2 interface organization process between base station according to correlative technology;
Figure 4 is a flowchart of an information switching notification method according to the embodiment of the present invention;
Figure 5 is a structure diagram of a base station in accordance with the embodiment of the present invention;
Figure 6 is a schematic diagram of scene change according to the first and second embodiments;
Figure 7 is a flowchart of another information switching notification method according to the embodiment of the present invention;
Figure 8 is a structure diagram of another base station in accordance with the embodiment of the present invention. Detailed Description
The present invention will be detailed hereinafter with reference to the drawings and in conjunction with the embodiments. What should be explained is that if not conflicting, the embodiments of the present invention can be intercombined with the features in the embodiments.
The embodiment of the present invention provides a method for notifying switching information. Figure 4 is a flowchart of a method of notifying switching information in accordance with the embodiment of the present invention. As shown in Figure 4, the method comprises: Step S402, the source base station determines to change the UE for the target PCell of the target base station; Step S404, the source base station notifies the target base station of the signal quality of the target PCell.
Since carriers with similar signal qualities have the best aggregation effect, the present invention makes the method reduce the time delay of the change. In the method, the source base station notifies the changed target Pcell signal quality to the target base station, so that the target base station can acquire the target Pcell signal quality. In this way, by comparing the quality differences between the target Pcell and the supporting Scell, the method can determine the final Scell, ensuring that the signal quality differences between the target Pcell and the supporting Scell are within the predefined range. , improving accuracy in selecting the Scell, and reducing change time delay.
The step that the source base station notifies the target Pcell's signal quality to the target base station can be performed by adding one of the following ways: (1) The source base station includes the target Pcell's signal quality in the optimal cell list , and then sends the optimal cell list to the target base station; (2) The source base station includes the signal quality of the target PCell in a predefined information cell instead of the optimal cell list, and then sends the predefined information cell to the target base station.
Preferably, the reported signal quality as mentioned above may comprise at least one of RSRP and RSRQ.
What needs to be explained is that if there are several Pcells, the signal qualities of each Pcell can be transmitted.
Preferably, prior to the step that the source base station notifies the signal quality of the target PCell to the target base station, the method also comprises: the source base station negotiates with the target base station whether or not to transmit an optimal cell list, or , the source base station determines whether or not to transmit the optimal cell list based on whether or not the currently changed UE supports carrier aggregation, or whether or not there is only one operating cell of the UE; proceeding to the next step if it determines to transmit the optimal cell list, otherwise terminating the notification.
Under the circumstances that the optimal cell list is not transmitted, the target base station does not need to acquire the signal quality from the PCell to determine the correct Scell. Therefore, by virtue of the above-mentioned process, whether the signal quality of the target PCell needs to be notified can be determined according to whether the optimal cell list is transmitted.
Figure 5 is a structure diagram of a base station in accordance with the embodiment of the present invention. The base station comprises: a change determination module 52 configured to change the UE for the target Pcell of the target base station; and a notification module 54 which is coupled with the change determination module 52 and is configured to notify the signal quality of the target PCell to the target base station.
The first embodiment which integrates the technical schemes of a plurality of preferable embodiments as mentioned above will be detailed hereinafter taking the scene of changing the interface X2 as an example. The S1 interface change scene has the similar process; that way, unnecessary details will not be repeated here anywhere.
As shown in Figureδ, first, through negotiation, base station 1 and base station 2 determine to carry the optimal cell list on a staging command change. The negotiation process initiated by base station 1 is as follows (the negotiation process initiated by base station 2 is similar, so unnecessary details will not be repeated here anywhere): if base station 1 needs to carry the cell list optimal in the prepare command change sent to base station 2, base station 1 sends a newly added optimal cell list carrying request message to base station 2. After base station 2 receives the optimal cell list carrying request message request, if base station 2 agrees, base station 2 returns a newly added optimal cell list carrying response message to base station 1; and if base station 2 disagrees, base station 2 returns a newly added optimal cell list carrying refuse message to base station 1. Or, base station 1 carries the optimal cell list carrying request message in the request message of organization X2. After base station 2 receives the list of optimal cell carrying request message, if base station 2 agrees, base station 2 carries an optimal cell list carrying message accordingly in the organization response X2; and if base station 2 disagrees, base station 2 carries an optimal cell list carrying disagreement message in the organization response X2. Or, base station 1 carries the optimal cell list by carrying request message in the mobility parameter change request message. After base station 2 receives the list of optimal cell carrying request message, if base station 2 agrees, base station 2 carries the list of optimal cell carrying message accordingly in the mobility parameter change response; and if base station 2 disagrees, base station 2 carries the list of optimal cell carrying disagreement message in the mobility parameter change response, or the mobility parameter change failure response. The processes for negotiating the other parameters between the base stations are similar to the process mentioned above, so unnecessary details will not be repeated here anywhere.
If negotiation is performed via interface S1, then organization request message S1 carries the newly added optimal cell list carrying request message; and the organization reply message S1 carries the added new optimal cell list carrying reply/denial message. The process is the same with the process as mentioned above. Or, the source base station determines whether to include the optimal cell list or not, according to the capacity of the current UE that needs to make the change. If the UE does not support carrier aggregation, the optimal cell list will not be carried; or if the UE supports carrier aggregation but uses only one cell, the optimal cell list will not be carried over.
UE1 and UE2 configure cell 1 in F1 and cell 2 in F2 during communication, in which cell 1 is a Pcell, and cell 2 is a Scell. Furthermore, the base station allocates the following measurement task to UE1 and UE2 through the RRC reconfiguration command: MID=1, MO=F1, RC=A2; MID=2, MO=F2, RC=A2; MID=3, MO=F1, RC=A3, the default offset is 3dB, and the RSRP and RSRQ are reported; MID=4, MO=F2, RC=A6, the default offset is OdB, and the RSRP and RSRQ are reported;
UE1 moves to point A, and UE reports the measurement report that MID=4. The reported cell list is as follows: Cell 4 (RSRP=47, -94dbm, RSRQ=6, -17db), carrying the signal quality of CelH (RSRP=43, -98dbm, RSRQ=4, -18db), and the signal quality of Cell2 (RSRP=40, -101dbm, RSRQ=5, -17.5db).
The UE also reports the measurement report that MID=3. The reported cell list is as follows: Cell 3 (RSRP=46, -95dbm, RSRQ=12, -14db), carrying the signal quality of Cell 1 (RSRP=41, -100dbm, RSRQ=4, -18db) , and the signal quality of Cell 2 (RSRP=39, -102dbm, RSRQ=5, -17.5db).
The base station determines to change UE1 to Cell4 on F2 (i.e., Pcell is Cell4 on F2), according to the above mentioned measurement reports, sends the change request message 5 to base station 2 which Cell4 belongs to, and carries the optimal cell list. The optimal cell list organization modes are detailed as follows:
The first mode: Cell4 is the target Pcell selected by the source cell. According to the current change flow, cell 10 notifies the target base station through the change of the prepare command. The newly added optimal cell list does not carry the cell, so the optimal cell list comprises only Cell3, and Cell3's RSRP and/or RSRQ. The target base station needs to configure the Scell which is similar to the target Pcell to perform the aggregation, so the source base station needs to notify the target base station of the target Pcell's signal quality, namely the RSRP and/or RSRQ from Cell4. The detailed organization mode is as shown in table 1: Table 1

The cell in the optimal cell list can be identified by adding a PCI (physical cell identity) to the carrier.
Since each measurement task identifier corresponds to a measurement object, the measurement task identifier also actually comprises the information carrier. Therefore, the cell in the optimal cell list can also be identified by adding the PCI to the measurement task identifier.
The second mode: Cell4 is the target Pcell selected by the source cell. According to the current change flow, the cell notifies the target base station through the change of the staging command. Since the signal quality of the cell needs to be notified to the target base station in order to simplify and put the signaling format in order, the newly added optimal cell list comprises the cell, so the optimal cell list comprises Cell3 and Cell4, and the RSRP and/or RSRQ of Cell3 and Cell4 (the modality adopts RSRP and RSRQ). Cells are sequenced according to the designated RSRP or RSRQ. In the embodiment, the cells are sequenced according to the RSRP. The detailed organization mode is as shown in table 2: Table 2

What needs to be explained is that the above mentioned method is also applicable for the source Pcell and for the source Scell. The signal qualities of the source Pcell and the source Scell are carried in each measurement report. If the signal quality of the source Pcell is optimal at the frequency point, the optimal cell comprising the frequency point in the optimal cell list is the source Pcell. As a matter of course, in this situation the source base station will not determine to make the change. And the reasons why the source base station once determines to make the change in this situation are the load and the like. If the signal quality of the source Scell is optimal at the frequency point, the optimal cell comprising the frequency point in the optimal cell list is the source Scell. In the modality, neither the source Pcell nor the source Scell is optimal at the frequency point, so the source Pcell and source Scell neither appear in the optimal cell list.
The embodiment of the present invention also provides another method of reporting information switching. Figure 7 is a flowchart of another information switching notification method, in accordance with the embodiment of the present invention. As shown in Figure 7, the method comprises: Step S702, the source base station arranges cells in an optimal cell list according to a predefined signal quality, in which the predefined signal quality includes one of RSRP and RSRQ; Step S704, the source base station notifies the target base station of the optimal cell list.
By virtue of the above-mentioned process, the optimal cell list obtained by the target base station has been sequenced, so that the target base station can conveniently select the Scell and the processing time that the target base station select the Scell can be saved.
Since carriers with similar signal qualities have the best aggregation effect, so as to reduce the time delay change, cells in the optimal cell list can conform to the following predefined conditions: the predefined signal quality of a secondary support cell (Scell) > (the default signal quality of a target Pcell identified by the source base station - a default offset). The method constrains that only when the signal quality of the supporting Scell is higher than the rest of the predefined offset subtraction from the signal quality of the supporting Pcell, the supporting Scell can be added in the cell list to transmit to the target side, so the time delay change is reduced.
If there are several supporting Pcells, any one supporting Pcell can be selected as a reference. The optimal supporting Pcell or the worst supporting Pcell is selected as a reference, or all supporting Pcells are selected as a reference (that is, the supporting Scell is added to the cell list if the signal quality of the supporting Scell is higher than the remainder of subtracting the preset offset from the signal quality of any supporting Pcell). That is, under the circumstance that the source base station determines a plurality of target Pcells, the predefined condition of the reference cell for comparison comprises: the predefined signal quality of the supporting Scell > (the predefined signal quality of a predefined target Pcell - a predefined offset), in which the predefined target Pcell includes one of the following: a target Pcell with optimal predefined signal quality among the plurality of target Pcells, a target Pcell with the worst predefined signal quality among the plurality of target Pcells , and an arbitrary target Pcell from the plurality of target Pcells.
Preferably, the optimal cell list configuration information is determined by the protocol. In this way, all base stations adopt uniform configuration parameters, so the configuration is convenient to carry out and the negotiation process is saved. Or, the optimal cell list configuration information is determined through negotiation between the source base station and the target base station, wherein the configuration information comprises at least one of the following: the predefined offset, the predefined signal quality, and the maximum number of cells in the optimal cell list. The source base station can perform the optimal cell list configuration according to the configuration information. By controlling the number of cells in the optimal cell list, the main signaling can be decreased as much as possible.
Preferably, the negotiation process between the source base station and the target base station for configuration information may adopt one of the following modes: (1) a group of the source base station and the target base station including the configuration information of a group in an organizing request and sending the organizing request to the other group of the source base station and the target base station during a process of organizing an interface S1 or an interface X2; and the other group returning an organization response that includes the other group's configuration information. (2) one group of the source base station and the target base station notifying the configuration information to the other group of the source base station and the target base station via a mobility parameter change request message; and the other group returning a mobility parameter change response message including information indicating agreement or not, including any information whether the other group agrees with the configuration information, or the other group returning a parameter change failure message or a mobility parameter change response message, including the configuration information of the other group if the other group disagrees with the configuration information.
Preferably, before the source base station arranges the cells in the optimal cell list, in accordance with the predefined signal quality, the source base station negotiates with the target base station whether or not to transmit an optimal cell list, or, the source base determines whether or not it transmits the optimal cell list based on whether or not the UE has currently changed carrier aggregation support, or whether or not there is only one UE operating cell; proceeding to the next step if it determines to transmit the optimal cell list, otherwise terminating the notification.
Preferably, an optimal cell that does not have a predefined signal quality measurement result at a frequency is not added to the optimal cell list or is added to the end of the optimal cell list.
Preferably, the above-mentioned signal quality (e.g. the RSRP or RSRQ) for comparison can be determined through negotiation between the base stations, or can be designated by the protocol.
Figure 8 is a structure diagram of another base station, in accordance with the embodiment of the present invention. As shown in Figure 8, the base station comprises: a sorting module 82 which is configured to sort cells in an optimal cell list according to a predefined signal quality, wherein the predefined signal quality includes one of RSRP and RSRQ ; and a notification module 84 which is configured to notify the target base station of the optimal cell list.
A second embodiment which integrates the technical schemes of a plurality of preferred embodiments as mentioned above will be detailed hereinafter taking the scene of changing the interface X2 as an example. S1 interface scene change has similar process, so unnecessary details will not be repeated here anywhere. the second modality
First, through negotiation, base station 1 and base station 3 determine to carry the optimal cell list on change of the prepare command. The negotiation process initiated by base station 1 is as follows (the negotiation process initiated by base station 3 is similar, so unnecessary details will not be repeated here anywhere): whether base station 1 needs to carry cell list 5 optimal, change the prepare command sends to base station 3, base station 1 sends the newly added optimal cell list carrying request message to base station 3. After base station 3 receives the optimal cell list carrying request message , if base station 3 agrees, base station 10 3 returns the newly added optimal cell list carrying response message to base station 1; and if base station 3 disagrees, base station 3 returns the newly added optimal cell list 1 carrying refuse message to base station 1. Or, base station 1 carries the optimal cell list 15 carrying request message in the message from organization request X2. After base station 3 receives the list of optimal cell carrying request message, if base station 3 agrees, base station 3 carries the list of optimal cell carrying message accordingly in the organization response X2; and if base station 3 disagrees, base station 3 carries the optimal cell list carrying disagreement message in the organization response X2. Or, base station 1 carries the optimal cell list by carrying request message in the mobility parameter change request message. After base station 25 receives the list of optimal cell carrying request message, if base station 3 agrees, base station 3 carries the list of optimal cell carrying message accordingly in the mobility parameter change response; and if the base station 3 disagrees, the base station 3 carries the optimal cell list 30 carrying the disagreement message in the mobility parameter change response, or the mobility parameter change failure response. The processes for negotiating the other parameters between the base stations are similar to the process mentioned above; that way unnecessary details will not be repeated here anywhere.
If negotiation is performed via interface S1, then organization request message S1 carries the newly added optimal cell list carrying request message; and the organization reply message S1 carries the added new optimal cell list carrying reply message/denial message. The process is the same with the process as mentioned above. Or, the source base station determines whether to carry the optimal cell list or not, according to the capacity of the current UE that needs to make the change. If the UE does not support carrier aggregation, the optimal cell list will not be carried; or if the UE supports carrier aggregation but uses only one cell, the optimal cell list will not be carried over.
Through negotiation, base station 1 and base station 3 determine that only when the signal quality of the supporting Scell is higher than the remainder of the 3dB subtraction from the signal quality of the supporting Scell, can the supporting Scell support be added in cell list to transmit to target side. The above-mentioned 3dB preset offset can also be assigned via the protocol. In addition, the optimal cell list that base station 1 and base station 3 determine to transmit through negotiation is sequenced according to RSRP, and the RSRP and RSRQ values of each cell in the list are transmitted simultaneously. The order according to RSRP can also be assigned via the protocol.
In addition, optimal cells are selected according to signal quality for sorting. The cells in the list are sequenced according to the RSRP in the above-mentioned example, so the optimal cells are selected according to the RSRP. If the cell measurement result at a certain frequency that only has the RSRQ and RSRP is null, the frequency has no cells with the optimal RSRP. Therefore, cells on the frequency are free of transmission, or the optimal cells on the frequency are selected by the base station and listed at the end of the optimal cell list. The above-mentioned example also has the following measurement task: MID=5, MO=F3, RC=A3, the default compensation is OdB, and the RSRQ is reported.
In this case, F3 does not have cells with the optimal RSRP. Therefore, cells in F3 are free of transmission, or optimal cells in F3 are listed at the end of the optimal cell list.
The default offset and signal quality for sorting may be different for each base station. For example, the default offset required by base station 1 is 2dB, and the signal quality for sorting is RSRQ; the default offset required by base station 3 is 3dB, and the signal quality for sorting is RSRP. Information can be transmitted to the other UE during X2 interface tuning between base station 1 and base station 3. As shown in Figure 3, when base station 1 starts X2 interface tuning, the base station carries the requirements of the base station base 1 in the organization request X2 which is then transmitted to base station 3; base station 3 carries base station 3's requirements in organization response X2 (if base station 3 does not have interface X2, base station 3 can carry requirements from base station 3 in organization request S1 and organization response S1 when interface S1 is adjusted) which is then transmitted to base station 1. Therefore, the optimal cell list in the change of prepare command sent by base station 3 to base station 1 is organized according to the situations that the default offset is 2dB and the signal quality for sorting is RSRQ; and the optimal cell list in the setup command change sent by base station 1 to base station 3 is arranged, according to the situations that the default offset is 3dB and the signal quality for 5 ordering is RSRR The notification processes of the other parameters between base stations are similar to the above mentioned process; that way, unnecessary details will not be repeated here anywhere.
As shown in Figure6, UE2 moves to the 10th point B, and the UE reports the measurement report that MID=4. The reported cell list is as follows: Cell6 (RSRP=42, -99dbm, RSRQ=8, -16db), and Cell4 (RSRP=41, -100dbm, RSRQ=5, -17.5db), i carrying the quality of signal from CellH (RSRP=43, -98dbm, RSRQ=4, -18db), and the signal quality from Cell2 (RSRP=40, -15 101dbm, RSRQ=5, -17.5db).
UE2 also reports the measurement report that MID=3. The reported cell list is as follows: Cell5 (RSRP=47, -94dbm, RSRQ=10, -15db), and Cell3 (RSRP=45, -96dbm, RSRQ=8, -16db), carrying the signal quality of the CelH (RSRP=41, -20 100dbm, RSRQ=4, -18db), and the signal quality of Cell2 (RSRP=39, -102dbm, RSRQ=5, -17.5db).
The base station determines to change UE2 to Cell5 on F1 (i.e. Pcell is Cell5 on F1), according to the above mentioned measurement reports, sends the change request message to base station 3 which Cell5 belongs to, and carries the optimal cell list. Cell5 and Cell6 are sequenced according to the RSRP. Cell6's RSRP is -94dbm, and Cell6's RSRP is -99dbm. According to the first organization mode, the optimal cell list is null; and, according to the second mode of organization, the optimal cell list comprises Cell6.
In addition, in order to meet the demands of various operators, that is, when base station 1 and base station 3 belong to different operators, the optimal cell list and measurement result is transmitted, or it cannot be constrained by the operators by negotiating the maximum number of cells in the optimal cell list. For example, the base station sends the mobility parameter change request carrying the maximum number (e.g. three) of cells to base station 3. If base station 3 agrees, base station 3 responds to the change response parameter to base station 1, in which the mobility parameter change response does not carry any information or carries information accordingly. Base station 1 and base station 3 take the maximum number (which is three in the above-mentioned example) of cells as the final result. If base station 3 disagrees, base station 3 responds to the mobility parameter change response to the base station 1, in which the mobility parameter change response carries the expected maximum number (e.g. two) of cells. Base station 1 and base station 3 take the maximum value (which is two in the above-mentioned example) of the two maximum cell numbers as the final result. As a course subject, the number of cells in the optimal cell list can also be assigned via the protocol.
The number of cells in the optimal cell list may be different on each base station. For example, the number of cells in the optimal cell list required by base station 1 is 2, and the number of cells in the optimal cell list required by base station 3 is 3. Information can be transmitted to the other UE during interface setup X2 between base station 1 and base station 3 (if interface X2 does not exist, information can be transmitted to the other UE during setup of interface S1). The optimal cell list in the setup command change that it sends to base station 1 by base station 3 comprises two cells at most, and the optimal cell list in the setup command change that it sends to base station 3 by base station 1 comprises three cells mostly.
What needs to be explained is that the two information switching notification methods provided in the above-mentioned 5 embodiments are two independent methods, and can be inter-combined. That is, not only the signal quality of the notified target PCell, but also the notified support Scell is controlled to meet the predefined requirements. In this way, the selection accuracy of the Scell is improved, and the time delay change 10 is reduced.
Altogether, the scheme provided by embodiments of the present invention specifies the detailed method of organizing the optimal cell list transmitted to the target base station by the source base station during the carrier aggregation change process, ensuring that the target side can effectively select cells of secondary service, according to the transmitted information, and reduces the time delay.
What needs to be explained is that the steps shown in the flowcharts of the attached drawings can be performed on a group of computers, such as a computer system capable of executing commands. Also, although the flowcharts show the logical sequence of steps, the steps shown or described in the flowcharts can be performed by different sequences from the above mentioned logical sequence.
Obviously, those skilled in the art should understand that the aforementioned modules and tapas of the present invention can be realized by the use of a general purpose calculation device, can be integrated into a calculation device, or distributed in a network consisting of a plurality of 30 of calculating devices. Alternatively, the modules and step of the present invention may be performed using the executable program code of the computing device. Consequently, the modules and steps can be stored in the storage device, and executed by the calculating device, or the modules and steps are produced in an integrated circuit module respectively, or a plurality of modules or steps of these 5 are produced in a integrated circuit module. Thus, the present invention is not restricted to any particular combination of hardware and software.
The above descriptions are only preferred embodiments of the present invention, which are not used to restrict the present invention. For those skilled in the art, the present invention may have various changes and variations. Any amendments, equivalent replacements, improvements, etc., within the spirit and principle of the present invention, are all within the scope of protection of the present invention.

权利要求:
Claims (7)
[0001]
1. Method of notifying information switching, characterized by comprising: a source base station that selects an optimal cell at each frequency to form an optimal cell list and arranges cells in the optimal cell list in descending order according to a quality predefined signal quality, wherein the predefined signal quality includes one of energy received by the reference signal and quality received by the reference signal; and the source base station notifying a target base station of the optimal cell list; where the cells in the optimal cell list are non-service cells; where the signal quality of each cell in the list of optimal cells meets a predefined condition, and the predefined condition includes: the predefined signal quality of a candidate secondary cell > predefined signal quality of a target primary cell identified by the source base station - a predefined compensation; wherein the serving cell on the downlink primary component carrier is termed the primary cell, and the serving cell on the downlink secondary component carrier is termed the secondary cell.
[0002]
2. Method according to claim 1, characterized in that if the source base station identifies a plurality of target primary cells, the predefined condition includes: the predefined signal quality of the candidate secondary cell > the predefined signal quality of a predefined primary target cell - a predefined offset, in which the predefined primary target cell includes one of the following: a primary target cell with an optimal predefined signal quality among the plurality of primary target cells, a primary target cell with a predefined quality worst among the plurality of primary target cells, and an arbitrary primary target cell of the plurality of primary target cells.
[0003]
3. Method according to claim 1, characterized in that the optimal cell list configuration information is determined by a protocol, or is determined through a negotiation between the source base station and the target base station, in the which configuration information includes at least one of the following: default offset, default signal quality, and a maximum number of cells in the optimal cell list.
[0004]
4. Method according to claim 3, characterized in that the step of the source base station negotiating the configuration information with the target base station additionally includes: a source base station group r of the target base station including the information of configuring the one group in an organizing request and sending the organizing request to the other group of the source base station and the target base station during an organizing process of an S1 interface or an X2 interface; and the other group returning an organization response that includes the other group's configuration information.
[0005]
5. Method according to claim 3, characterized in that the step of the source base station that negotiates the configuration information with the target base station additionally includes: a group of the source base station and the target base station that notifies the configuration information to the other group of the source base station and the target base station via a mobility parameter change request message; and the other group returning a mobility parameter change response message including information indicating agreement or not including any information whether the other group agrees with the configuration information, or the other group returning a parameter change failure message or a mobility parameter change response message including the configuration information of the other group if the other group disagrees with the configuration information.
[0006]
6. Method according to claim 1, characterized in that an optimal cell that does not have a predefined signal quality measurement result at a frequency is not added to the optimal cell list, or is added to the end of the list. of optimal cell.
[0007]
7. Base station, characterized in that it comprises: a sorting module (82), configured to select an optimal cell at each frequency to form an optimal cell list and sort cells in the optimal cell list according to a predefined signal quality in descending order, in which the predefined signal quality includes one of energy received by the reference signal and quality received by the reference signal; and the notification module (84), configured to notify the target base station of the optimal cell list; where the cells in the optimal cell list are non-service cells; where the signal quality of each cell in the list of optimal cells meets a predefined condition, and the predefined condition includes: the predefined signal quality of a candidate secondary cell > predefined signal quality of a target primary cell identified by the source base station - a predefined compensation; wherein the serving cell on the downlink primary component carrier is termed the primary cell, and the serving cell on the downlink secondary component carrier is termed the secondary cell.

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同族专利:

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公开号 | 公开日

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US20130183970A1|2013-07-18|

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CN102421149A|2012-04-18|

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EP2621218A4|2013-10-09|

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WO2012041044A1|2012-04-05|

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EP2621218A1|2013-07-31|

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BR112013007367A2|2020-07-28|

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US8934902B2|2015-01-13|

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JP2013541286A|2013-11-07|

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EP2621218B1|2016-10-26|

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法律状态:
2020-08-04| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04W 36/30 Ipc: H04W 36/30 (2009.01) |

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2020-08-04| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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2021-11-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2022-01-11| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 21/03/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |

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