CN104581849A - Residential quarter switch method - Google Patents
Residential quarter switch method Download PDFInfo
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- CN104581849A CN104581849A CN201510009228.1A CN201510009228A CN104581849A CN 104581849 A CN104581849 A CN 104581849A CN 201510009228 A CN201510009228 A CN 201510009228A CN 104581849 A CN104581849 A CN 104581849A
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- cell
- switch
- current service
- rsrp
- service cell
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Abstract
The invention relates to a residential quarter switch method, and belongs to the technical field of wireless communication. The method comprises the following steps that UE continuously detects reference signal received power RSRP of a current serviced residential quarter and an adjacent residential quarter, and data smoothing is performed on the RSRP to judge whether the PSRP meets a switch triggering condition or not, if the PSRP meets the switch triggering condition, a time TTT timer is triggered to begin to time and perform step two, otherwise if the PSRP does not meet the switch triggering condition, the RSRP is continued to be detected; when the UE sends a pre-switch request message to the current serviced residential quarter, the current serviced residential quarter determines a UE pre-switch candidate residential quarter set according to the received message; the current serviced residential quarter notices a pre-switch candidate residential quarter to perform pre-switch preparation; if the TTT fails and the switch triggering condition detected by the EU is still met, a switch indication is sent to the current serviced residential quarter; the current serviced residential quarter determines a switch target residential quarter according to a measurement report; the current serviced residential quarter notices the switch target residential quarter to perform switching. The method can effectively reduce ping-pong effect and switching delay, and improve QoS experience of a user.
Description
Technical field
The invention belongs to wireless communication technology field, relate to a kind of cell switching method.
Background technology
Along with wireless communication technology is fast-developing, various intelligent terminal presents explosive growth trend, and rich and varied data service also continues to bring out, and user's high-rate service needs to propose stern challenge to conventional cellular network.Isomery cellular network technologies is by classical macro-cellular coverage, introduce low power nodes, as relay, Pico cell website and Home eNodeB etc., strengthen the covering of specific region targetedly, formation multitiered network covers, effectively can realize user QoS to ensure, elevator system resource utilization.In isomery cellular network, low power nodes is disposed irregular, coverage and be there is the characteristics such as the network characteristics such as larger difference and user moving speed, business demand characteristic be different and all propose difficulty and challenge to the switching controls technology of isomery cellular network.
Isomery cellular network subscriber performance of handoffs lifting scheme is considered in existing research at present.Mechanism is prepared as proposed a kind of pre-switch in motion [3GPP TdocR2-132375.PerformanceAnalysis onEarlyHOPreparation andEarlyHO CMD.ZTE Corporation.2013].Current service cell performs forward direction pre-switch candidate cell in switching and sends pre-switch preparation message, notice pre-switch candidate cell carries out resource reservation, thus effectively reduce handoff failure probability, but do not consider how to choose pre-switch candidate cell in the program, non-potential handover candidate cells may be caused to perform pre-switch prepare, cause the cell channel wasting of resources and larger signaling consumption.In addition, select mainly to consider user received signal intensity, do not consider that user switches to traffic performance behind Target cell in existing research for Target cell, user QoS may be caused to experience cannot be protected.Therefore, how to consider user's handover success rate, handover candidate cells and Target cell characteristic, user QoS experience etc. multifactor, designing efficient changing method becomes problem demanding prompt solution.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of cell switching method, the method is as follows:
A kind of cell switching method, comprises the following steps:
Step one: subscriber equipment (UE) continues to detect current service cell and neighbor cell Reference Signal Received Power RSRP, and judge whether to meet handover triggering condition after carrying out data smoothing to RSRP, if, then start triggered time (TTT) timer, and perform step 2, otherwise, continue to detect RSRP;
Step 2: UE sends pre-switch request to current service cell, comprising oneself state and neighbor cell state; UE pre-switch candidate cell collection, according to the message received, is determined in current service cell;
Step 3: current service cell notice pre-switch candidate cell performs pre-switch and prepares;
Step 4: if when TTT lost efficacy, UE detects that handover triggering condition still meets, then send to current service cell and switch instruction, wherein comprise current area and neighboring cell measurement reporting;
Step 5: switching target small area is determined according to measurement report in current service cell;
Step 6: notice switching target small area, current service cell performs switching.
Further, in step one, UE continues to detect current service cell and neighbor cell Reference Signal Received Power RSRP, and RSRP is obtained the Reference Signal Received Power RSRP smoothly via exponential average filter
s(t), filter model used as shown in the formula:
RSRP
s(t)＝kRSRP
r(t-1)+(1-k)RSRP
r(t)
Wherein, RSRP
st () represents t filter output value, RSRP
rt () represents the Reference Signal Received Power that t receives, i.e. filter input value, k represents filter smoothing parameter.
Further, handover triggering condition be neighbor cell and current service cell level and smooth after RSRP difference higher than trigger thresholds; If with
represent the RSRP after current service cell is smoothly, with
represent the RSRP after i-th neighbor cell smoothly, handover triggering condition is expressed as: there is i, meets
wherein, RSRP
thfor trigger thresholds.
Further, in step 2, the pre-switch request message that UE sends to current service cell comprises oneself state and neighbor cell state, and wherein, UE oneself state comprises the current translational speed of UE and direction.
Further, in step 2, current service cell, according to UE oneself state and neighbor cell state, is determined UE pre-switch candidate cell collection, is specifically comprised:
1) current service cell judges whether to perform switching according to UE translational speed, if UE is speed V≤V
th, V
thfor translational speed threshold value, then step 2 can be performed); Otherwise current service cell terminates as UE and selects pre-switch candidate cell;
2) the RSRP difference of the neighbor cell that reports according to UE, current service cell and current service cell is carried out first time to neighbor cell and is screened, specific as follows: by the difference of neighbor cell and current service cell RSRP and the Δ RSRP preset
thcompare, if be greater than Δ RSRP
th, then this neighbor cell can be used as pre-switch candidate cell; Otherwise this neighbor cell is not as pre-switch candidate cell;
3) current service cell is according to the angle between UE moving direction and neighbor cell
programmed screening is carried out to pre-switch candidate cell, specific as follows: with
angle between line and UE moving direction between expression base station, i-th handover candidate cells and UE, if
then confirm that this community is for user's pre-switch candidate cell; If
ze Gai community is not as pre-switch candidate cell.After postsearch screening, UE pre-switch candidate cell collection can be obtained.
Further, in step 3, current service cell notice pre-switch candidate cell performs pre-switch and prepares, and specifically comprises:
1) current service cell sends pre-switch to pre-switch candidate cell and prepares message;
2) pre-switch candidate cell receives pre-switch and prepares message, performs resource reservation, and sends pre-switch preparation response message to current service cell;
3) current service cell receives pre-switch and prepares response message, and sends pre-switch request-reply message to UE.
Further, in step 5, switching target small area, according to measurement report, is determined in current service cell, specifically comprises:
1) current service cell obtain the pre-switch candidate cell received at UE place level and smooth after
and pre-switch candidate cell available bandwidth B
i, 1≤i≤N, wherein, N is pre-switch candidate cell number;
2) according to UE pre-switch candidate cell information, current service cell estimates that UE switches to the transmission rate after pre-switch candidate cell, with R
imark UE switches to the transmission rate behind the i-th community, can obtain
Wherein,
for arriving the RSRP at UE place, N with PinjGe community with i-th community
ifor number of cells frequently same with i-th community, σ
2for noise power; The pre-switch candidate cell that current service cell selects corresponding transmission rate maximum as switching target small area, that is: i
*=argmaxR
i.
Beneficial effect of the present invention is:
1) the present invention more accurately can estimate each cell reference signals received power RSRP that UE receives, and reduces data and to suddenly change the impact brought switch decision, effectively avoid ping-pong.
2) the pre-switch candidate cell system of selection in the present invention effectively can reduce pre-switch and prepare number of cells, thus the wasting of resources is reserved in minimizing community, reduces signaling consumption.
3) object cell selection method in the present invention, switches to the transmission rate select target community behind Target cell based on UE, thus can effective guarantee switch UE QoS experience.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is isomery cellular network scene schematic diagram;
Fig. 2 is the schematic flow sheet of the method for the invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is isomery cellular network scene schematic diagram, in figure in a macro cell coverage region exist 7 low-power cellular cells, each low-power cellular cell not with macrocellular shared band, wherein, community A, C and F shared band f
1, community B, E, G shared band f
2, community D exclusively enjoys frequency range f
3.UE is in moving process, the Reference Signal Received Power (RSRP) of macrocellular and low-power cellular cell is detected, if UE detects meet handover triggering condition, and after the interval triggered time (TTT), this condition still meets, then perform switching.
Fig. 2 is the cell switching method flow chart that the present invention proposes.As shown in the figure, cell switching method of the present invention is specific as follows:
S1: current service cell is that UE sends Survey control message, and UE carries out measurement parameter configuration by Survey control message, carries out periodicity detect current service cell and neighbor cell.
Whether S2:UE detects handover triggering condition and meets.Handover triggering condition is defined as:
wherein,
represent the RSRP value after current service cell is smoothly,
represent the RSRP value after i-th neighbor cell smoothly.UE adopts exponential average filter to obtain the Reference Signal Received Power RSRP smoothly
st (), filter model used is: RSRP
s(t)=kRSRP
r(t-1)+(1-k) RSRP
r(t).If meet handover triggering condition, UE sends pre-switch request message to current service cell, and TTT timer starts timing; Otherwise UE continues to detect current service cell and neighbor cell RSRP value.
S3:UE sends pre-switch request message to current service cell, comprising UE self translational speed and moving direction.The selection of pre-switch candidate cell is carried out according to UE mobile status in current service cell, and concrete selection course is: (1) current service cell judges whether to perform switching according to UE translational speed; If V≤V
th, then step (2) is performed; Otherwise current service cell terminates as UE and selects pre-switch candidate cell collection; (2) the RSRP difference of the neighbor cell that reports according to UE, current service cell and current service cell is screened for the first time to neighbor cell, and filter criteria is: by neighbor cell and current service cell RSRP difference and the threshold value Δ RSRP preset
thcompare, if be greater than Δ RSRP
th, then this neighbor cell can be used as pre-switch candidate cell; Otherwise this neighbor cell is not as pre-switch candidate cell; (3) current service cell is according to the angle between UE moving direction and neighbor cell
carry out postsearch screening to pre-switch candidate cell, screening is prepared as: with
angle between line and UE moving direction between expression base station, i-th handover candidate cells and UE, if
illustrate that UE moves to this direction, community contiguous, then confirm that this community is UE pre-switch candidate cell; If
then illustrate that UE is away from this community, this community is not as pre-switch candidate cell.UE pre-switch candidate cell collection can be arrived through postsearch screening.
S4: current service cell is send pre-switch to pre-switch candidate cell after UE carries out the selection of pre-switch candidate cell to prepare message; Pre-switch candidate cell receives pre-switch and prepares message, performs resource reservation, and sends pre-switch preparation response message to current service cell, and notice current service cell has switched ready; Current service cell receives after pre-switch prepares response and sends pre-switch request-reply message to UE, and notice UE pre-switch prepares to complete.
S5:UE continues the RSRP value detecting current service cell and neighbor cell, if TTT timer terminates, handover triggering condition still meets, namely
then UE sends switch indicating information to current service cell.
S6: after current service cell receives and switches instruction, switches to the transmission rate behind Target cell for Consideration with UE and carries out Target cell selection, be specially: current service cell obtains pre-switch candidate cell at UE place
value and pre-switch candidate cell available bandwidth B
i, 1≤i≤N, wherein, N is UE neighbor cell number; According to pre-switch candidate cell information, current service cell estimates that UE switches to the transmission rate after pre-switch candidate cell, with R
imark UE switches to transmission rate behind i-th community, can obtain
Wherein,
for arriving the RSRP at UE place, N with a jth cell base station frequently with i-th community
ibe co-frequency cell, i-th community number, σ
2for noise power; The candidate handover cell that current cell base station selects corresponding transmission rate maximum as switching target small area, that is: i
*=argmaxR
i.
S7: current service cell sends to UE and switches instruction response message, and starts to perform handoff procedure.After handoff procedure terminates, current service cell sends resource release message to other pre-switch candidate cells, notifies other pre-switch candidate cells release handoff reservation resource.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (7)
1. a cell switching method, is characterized in that: comprise the following steps:
Step one: subscriber equipment (UE) continues to detect current service cell and neighbor cell Reference Signal Received Power RSRP, and judge whether to meet handover triggering condition after carrying out data smoothing to RSRP, if, then start triggered time (TTT) timer, and perform step 2, otherwise, continue to detect RSRP;
Step 2: UE sends pre-switch request to current service cell, comprising oneself state and neighbor cell state; UE pre-switch candidate cell collection, according to the message received, is determined in current service cell;
Step 3: current service cell notice pre-switch candidate cell performs pre-switch and prepares;
Step 4: if when TTT lost efficacy, UE detects that handover triggering condition still meets, then send to current service cell and switch instruction, wherein comprise current area and neighboring cell measurement reporting;
Step 5: switching target small area is determined according to measurement report in current service cell;
Step 6: notice switching target small area, current service cell performs switching.
2. a kind of cell switching method according to claim 1, it is characterized in that: in step one, UE continues to detect current service cell and neighbor cell Reference Signal Received Power RSRP, and RSRP is obtained the Reference Signal Received Power RSRP smoothly via exponential average filter
s(t), filter model used as shown in the formula:
RSRP
s(t)＝kRSRP
r(t-1)+(1-k)RSRP
r(t)
Wherein, RSRP
st () represents t filter output value, RSRP
rt () represents the Reference Signal Received Power that t receives, i.e. filter input value, k represents filter smoothing parameter.
3. a kind of cell switching method according to claim 2, is characterized in that: handover triggering condition be neighbor cell and current service cell level and smooth after RSRP difference higher than trigger thresholds; If with
represent the RSRP after current service cell is smoothly, with
represent the RSRP after i-th neighbor cell smoothly, handover triggering condition is expressed as: there is i, meets
wherein, RSRP
thfor trigger thresholds.
4. a kind of cell switching method according to claim 1, it is characterized in that: in step 2, the pre-switch request message that UE sends to current service cell comprises oneself state and neighbor cell state, and wherein, UE oneself state comprises the current translational speed of UE and direction.
5. a kind of cell switching method according to claim 1, is characterized in that: in step 2, and current service cell, according to UE oneself state and neighbor cell state, is determined UE pre-switch candidate cell collection, specifically comprised:
1) current service cell judges whether to perform switching according to UE translational speed, if UE is speed V≤V
th, V
thfor translational speed threshold value, then step 2 can be performed); Otherwise current service cell terminates as UE and selects pre-switch candidate cell;
2) the RSRP difference of the neighbor cell that reports according to UE, current service cell and current service cell is carried out first time to neighbor cell and is screened, specific as follows: by the difference of neighbor cell and current service cell RSRP and the Δ RSRP preset
thcompare, if be greater than Δ RSRP
th, then this neighbor cell can be used as pre-switch candidate cell; Otherwise this neighbor cell is not as pre-switch candidate cell;
3) current service cell is according to the angle between UE moving direction and neighbor cell
programmed screening is carried out to pre-switch candidate cell, specific as follows: with
angle between line and UE moving direction between expression base station, i-th handover candidate cells and UE, if
then confirm that this community is for user's pre-switch candidate cell; If
ze Gai community is not as pre-switch candidate cell.After postsearch screening, UE pre-switch candidate cell collection can be obtained.
6. a kind of cell switching method according to claim 1, is characterized in that: in step 3, and current service cell notice pre-switch candidate cell performs pre-switch and prepares, and specifically comprises:
1) current service cell sends pre-switch to pre-switch candidate cell and prepares message;
2) pre-switch candidate cell receives pre-switch and prepares message, performs resource reservation, and sends pre-switch preparation response message to current service cell;
3) current service cell receives pre-switch and prepares response message, and sends pre-switch request-reply message to UE.
7. a kind of cell switching method according to claim 1, is characterized in that: in step 5, and switching target small area, according to measurement report, is determined in current service cell, specifically comprises:
1) current service cell obtain the pre-switch candidate cell received at UE place level and smooth after
and pre-switch candidate cell available bandwidth B
i, l≤i≤N, wherein, N is pre-switch candidate cell number;
2) according to UE pre-switch candidate cell information, current service cell estimates that UE switches to the transmission rate after pre-switch candidate cell, with R
imark UE switches to the transmission rate behind the i-th community, can obtain
Wherein,
for arriving the RSRP at UE place, N with PinjGe community with i-th community
ifor number of cells frequently same with i-th community, σ
2for noise power; The pre-switch candidate cell that current service cell selects corresponding transmission rate maximum as switching target small area, that is: i
*=argmaxR
i.
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| CN110012513A (en) * | 2018-01-05 | 2019-07-12 | 中国移动通信有限公司研究院 | A kind of switching method, base station and computer readable storage medium |
| CN110012513B (en) * | 2018-01-05 | 2021-11-16 | 中国移动通信有限公司研究院 | Switching method, base station and computer readable storage medium |
| CN110418385A (en) * | 2018-04-26 | 2019-11-05 | 夏普株式会社 | Terminal installation, base station apparatus, wireless communication system and wireless communications method |
| WO2020029366A1 (en) * | 2018-08-09 | 2020-02-13 | Huizhou Tcl Mobile Communication Co., Ltd | Handover method and apparatus |
| CN114731558A (en) * | 2019-07-30 | 2022-07-08 | 弗劳恩霍夫应用研究促进协会 | Time-to-trigger and conditional handover enhancements |
| CN112449380A (en) * | 2019-08-28 | 2021-03-05 | 深圳市优克联新技术有限公司 | Method, device, base station and storage medium for switching control |
| CN114902732A (en) * | 2019-10-11 | 2022-08-12 | 瑞典爱立信有限公司 | Measurement reporting for conditional handover candidates |
| CN111343680A (en) * | 2020-03-02 | 2020-06-26 | 东南大学 | Switching time delay reduction method based on reference signal received power prediction |
| CN111343680B (en) * | 2020-03-02 | 2022-04-01 | 东南大学 | Switching time delay reduction method based on reference signal received power prediction |
| WO2022198544A1 (en) * | 2021-03-25 | 2022-09-29 | Oppo广东移动通信有限公司 | Wireless communication method, terminal device and network device |
| CN113453298A (en) * | 2021-06-01 | 2021-09-28 | 中国联合网络通信集团有限公司 | Condition switching method and condition switching device |
| CN113453298B (en) * | 2021-06-01 | 2023-03-31 | 中国联合网络通信集团有限公司 | Condition switching method and condition switching device |
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