CN103220737B - A kind of method for user device switching supporting carrier aggregation - Google Patents
A kind of method for user device switching supporting carrier aggregation Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a kind of subscriber equipment (UE) changing method supporting carrier aggregation, comprise the steps: to meet switch decision condition in A, UE moving process, judge that whether the Target cell switched is the community of low power nodes, if, perform step B, otherwise exit this flow process; B, judge whether Target cell supports carrier aggregation, if perform step F, otherwise perform step C; C, judge whether UE supports carrier aggregation, if so, perform step D, otherwise go to step F; D, judge whether described UE will configure carrier aggregation, if so, performs step e according to qos requirement, otherwise, go to step F; E, stop switching to target low power nodes, and process ends.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to carrier aggregation (Carrier-Aggregation, CA) technology, particularly a kind of subscriber equipment (UE) changing method supporting carrier aggregation.
Background technology
LTE-Advanced system is improve the peak rate of system further, supports the broadband connections up to 100MHz, have employed carrier aggregation (Carrier-Aggregation, CA) technology.Meanwhile, along with the develop rapidly of mobile Internet, intelligent terminal, data service is also in explosive increase.Under special scenes, traditional increase macro base station carrier wave or cell splitting technology have been difficult to meet 4G epoch people and have covered radio communication and the demand of capacity.Heterogeneous network (HeterogeneousNetwork, HetNet) introduce the low power nodes less than conventional macro base station transmitting power, comprise femto base station (Pico), femto base station (Femto) and relay station (Relay).Fig. 1 is the schematic diagram of isomerism network structure, the low power nodes such as femto base station (Pico), femto base station (Femto) and relay station (Relay) are deployed in the coverage of macro base station, provide the channel of hot spot region to strengthen.Link between via node and macro base station is called relay return link (RelayBackhaul), and Femto is connected with core net (CoreNetwork) by the Internet, and Pico or macro base station connect core net by back haul link.
In LTE-Advanced system, the usual function ratio in Macro base station is more powerful, can support carrier aggregation technology; And consider the factors such as cost, in network, not necessarily all low power nodes can both support carrier aggregation.Switching problem under this heterogeneous network scene brings new challenge to the network optimization.
A kind of MeNB supports carrier aggregation, and PeNB does not support the heterogeneous network handoff scenario of carrier aggregation as shown in Figure 2.MeNB1 and MeNB2 has 3 CC, PeNB to only have a CC (CC1), and UE1 is the central user under MeNB, and being polymerized 3 CC, UE2 is central user under MeNB, only uses 1 CC, UE3 to be edge customers under MeNB, has been polymerized 3 CC.UE1, UE2 all move to the center of PeNB, and UE3 moves to the center of MeNB2.Along with the movement of position, UE1, UE2 and UE3 can to MeNB1 report measurement results, and MeNB1 carries out switch decision accordingly.Under this scene, the target BS of UE1 and UE2 should be PeNB, and the target BS of UE3 should be MeNB2.Because PeNB does not support carrier aggregation, after UE1 switches, transmission performance may obviously decline, and therefore UE1 is not suitable for switching; And based on the effect that PeNB focus covers, the UE2 similar to UE1 channel condition is but applicable to switching; Although UE3 is also carrying out carrier aggregation transmission, because MeNB2 supports carrier aggregation, be also applicable to switching.Therefore switchover policy must be able to be avoided bringing predictable performance loss because of switching to system under this heterogeneous network scene.
At present, have multiple about the scheme of switching flow under carrier aggregation, but do not have relevant programme to be optimized for the carrier aggregation scene in heterogeneous network, and the switchover policy that proposition can effectively solve the problem.Therefore need for the new switchover policy of this Scenario Design.
Summary of the invention
The invention provides a kind of subscriber equipment (UE) changing method supporting carrier aggregation, can be optimized for the carrier aggregation scene in heterogeneous network.
A kind of UE changing method supporting carrier aggregation that the embodiment of the present invention provides, comprises the steps:
Meet switch decision condition in A, UE moving process, judge that whether the Target cell switched is the community of low power nodes, if so, perform step B, otherwise exit this flow process;
B, judge whether Target cell supports carrier aggregation, if perform step 306, otherwise perform step 302;
C, judge whether UE supports carrier aggregation, if so, perform step D, otherwise go to step 306.
D, judge whether described UE will configure carrier aggregation, if so, performs step e according to qos requirement, otherwise, go to step F;
E, stop switching to target low power nodes, and process ends.
F, to target low power nodes send handover request, be switched to described Target cell.
Preferably, described low power nodes is femto base station, femto base station or relay station.
Preferably, judge described in step B whether Target cell supports that carrier aggregation comprises:
Read pre-configured Target cell information in the neighbor list, know whether Target cell supports carrier aggregation.
Preferably, by X2 interface, this community knows whether Target cell supports carrier aggregation.
Preferably, judge described in step C whether UE supports that carrier aggregation comprises: according to the ability rating information that UE reports, base station knows whether UE supports carrier aggregation.
Preferably, judge whether described UE will configure carrier aggregation and comprise according to qos requirement described in step D:
The QoS of QoS and the UE demand that can be provided for a user by each carrier wave contrasts, if carrier wave can meet the qos requirement of user, does not then need to configure other carrier waves, otherwise carries out carrier aggregation.As can be seen from the above technical solutions, when the Target cell switched is the community of low power nodes, then judge whether to be applicable to be switched UE to be switched to target BS according to the ability of low power nodes ability, UE and qos requirement again, and judged result be divided into switching preferentially and not to switch preferential two kinds; If result is preferential for switching, then sends handover request to Target cell, complete handoff procedure, otherwise do not send handover request, reselect target BS or abandon switching.The program can effectively be avoided bringing unnecessary hydraulic performance decline because switching to UE.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of isomerism network structure;
Fig. 2 is that a kind of MeNB supports carrier aggregation, and PeNB does not support the heterogeneous network handoff scenario schematic diagram of carrier aggregation;
A kind of subscriber equipment (UE) changing method schematic diagram supporting carrier aggregation that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Basic thought of the present invention is, making in switch decision process based on existing handoff algorithms, if target BS is PeNB, then judge whether to be applicable to be switched UE to be switched to target BS according to the ability of PeNB ability, UE and qos requirement again, and judged result be divided into switching preferentially and not to switch preferential two kinds; If result is preferential for switching, then sends handover request to target P eNB, otherwise do not send handover request, reselect target BS by MeNB or abandon switching.Here PeNB ability refers to PeNB and whether supports carrier aggregation, and UE ability refers to UE and whether supports carrier aggregation, and qos requirement refers to system and whether is necessary for UE configuration carrier aggregation to meet the requirement such as speed, time delay of business.
Fig. 3 shows a kind of changing method flow process supporting carrier aggregation that the embodiment of the present invention provides, and comprises the steps:
Meet switch decision condition in step 300:UE moving process, judge that whether switching target small area is the community of low power nodes, if so, perform step 301, otherwise exit this flow process.
Step 301: base station judges whether Target cell supports carrier aggregation, if perform step 306, otherwise performs step 302.
Specific implementation includes but not limited to: be configured information of adjacent cells by Operation and Maintenance (OM) platform in advance, reads Target cell information in the neighbor list, can know whether Target cell supports carrier aggregation; Also can pass through interface such as X2 interface, between adjacent cell, carry out information transmission, thus this community is known, and whether adjacent cell support the information of carrier aggregation.
Step 302: base station judges whether UE supports carrier aggregation, if so, performs step 303, otherwise goes to step 306.
Specific implementation includes but not limited to: according to the ability rating information that UE reports, base station can know whether UE supports carrier aggregation.
Step 303: judge whether to configure carrier aggregation according to qos requirement, if so, performs step 304, otherwise, go to step 306.
Specific implementation includes but not limited to: the QoS of QoS and the UE demand that can be provided for a user by each carrier wave (community) contrasts, if a carrier wave (community) can meet the qos requirement of user, then do not need to configure other carrier waves, otherwise carry out carrier aggregation.
Step 304-305: judged result is preferential for not switching, stops switching to target low power nodes, and process ends.
Step 306-307: judged result is preferential for switching, and sends handover request to target low power nodes.
Described low power nodes includes but not limited to femto base station (Pico), femto base station (Femto) and relay station (Relay).
Below in conjunction with scene shown in Fig. 2, the present invention program is described.
The channel conditions of MeNB1 to user on member carrier 1 is designated as h
a, 1, the channel conditions on member carrier 2 is h
a, 2, the channel conditions on member carrier 3 is h
a, 3; PeNB is h to the channel conditions of user on member carrier 1
b, 1; MeBN2 on member carrier 1 to the channel conditions of user be h
c, 1, the channel conditions on member carrier 2 is h
c, 2, the channel conditions on member carrier 3 is h
c, 3.
(1) along with the movement of position, UE1 can to MeNB1 report measurement results, and MeNB1 carries out switch decision accordingly, and under this scene, UE1 target BS should be PeNB.MeNB1 according to the channel capacity of information theory formulae discovery UE1 under PeNB1 is
k=1, the channel capacity under MeNB1 is
m=3.Be in the better position under MeNB1 due to UE1, therefore suppose H
a> H
brational.Under this assumption, MeNB1 judges according to qos requirement, and under PeNB, UE1 also needs to carry out carrier aggregation, and has known that PeNB does not support carrier aggregation according to neighboring BS information MeNB1, so MeNB1 abandons UE1 to switch to PeNB;
(2) along with the movement of position, UE2 can to MeNB1 report measurement results, and MeNB1 carries out switch decision accordingly, and under this scene, UE1 target BS should be PeNB.Because UE2 does not carry out carrier aggregation under MeNB1, therefore can simplify and the judgement of qos requirement is operated, think that UE2 does not need to carry out carrier aggregation transmission under PeNB yet, make the operation switched to PeNB by UE2.
(3) along with the movement of position, UE1 can to MeNB1 report measurement results, and MeNB1 carries out switch decision accordingly, and under this scene, UE1 target BS should be MeNB2.MeNB1 according to the channel capacity of information theory formulae discovery UE1 under MeNB2 is
n=3, the channel capacity under MeNB1 is
m=3.Owing to carrying out switch decision, so hypothesis H
a< H
balso be rational, under this assumption, according to qos requirement, MeNB1 judges that UE3 also needs to carry out carrier aggregation under MeNB2, but MeNB2 can support carrier aggregation, so MeNB1 makes the operation switched to MeNB2 by UE3.If H
a>=H
b, but H
balso can meet the qos requirement of UE3, the operation that UE3 switches to MeNB2 can be made equally.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. support a user equipment (UE) changing method for carrier aggregation, it is characterized in that, comprise the steps:
Meet switch decision condition in A, UE moving process, judge that whether the Target cell switched is the community of low power nodes, if so, perform step B, otherwise exit this flow process;
B, judge whether Target cell supports carrier aggregation, if perform step F, otherwise perform step C;
C, judge whether UE supports carrier aggregation, if so, perform step D, otherwise go to step F;
D, judge whether described UE will configure carrier aggregation, if so, performs step e according to qos requirement, otherwise, go to step F;
E, stop switching to target low power nodes, and process ends;
F, to target low power nodes send handover request, be switched to described Target cell.
2. method according to claim 1, is characterized in that, described low power nodes is femto base station, femto base station or relay station.
3. method according to claim 1, is characterized in that, judges whether Target cell supports that carrier aggregation comprises described in step B:
Read pre-configured Target cell information in the neighbor list, know whether Target cell supports carrier aggregation.
4. method according to claim 1, is characterized in that, by X2 interface, this community knows whether Target cell supports carrier aggregation.
5. method according to claim 1, is characterized in that, judges whether UE supports that carrier aggregation comprises: according to the ability rating information that UE reports, base station knows whether UE supports carrier aggregation described in step C.
6. method according to claim 1, is characterized in that, judges whether described UE will configure carrier aggregation and comprise described in step D according to qos requirement:
The QoS of QoS and the UE demand that can be provided for a user by each carrier wave contrasts, if carrier wave can meet the qos requirement of user, does not then need to configure other carrier waves, otherwise carries out carrier aggregation.
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| CN201210019288.8A CN103220737B (en) | 2012-01-20 | 2012-01-20 | A kind of method for user device switching supporting carrier aggregation |
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| CN201210019288.8A CN103220737B (en) | 2012-01-20 | 2012-01-20 | A kind of method for user device switching supporting carrier aggregation |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101808373A (en) * | 2009-02-17 | 2010-08-18 | 大唐移动通信设备有限公司 | Method and device for supporting multi-carrier aggregation in switching process |
| CN102238666A (en) * | 2010-04-30 | 2011-11-09 | 中兴通讯股份有限公司 | Multi-carrier switch processing method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101808373A (en) * | 2009-02-17 | 2010-08-18 | 大唐移动通信设备有限公司 | Method and device for supporting multi-carrier aggregation in switching process |
| CN102238666A (en) * | 2010-04-30 | 2011-11-09 | 中兴通讯股份有限公司 | Multi-carrier switch processing method and system |
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