CN101801049A - Switching optimization method between macro cell and family base station cell - Google Patents
Switching optimization method between macro cell and family base station cell Download PDFInfo
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Abstract
The embodiment of the invention relates to a switching optimization method between Home eNode B and eNode B in a next generation mobile communication system (LTE/LTE-Advanced). The method comprises the steps that: the eNode B and the Home eNode B acquire the velocity information and business state information (real-time business or non-real-time business) of a wireless transmitting/receiving unit (WTRU); and when the measurement result is lower than the threshold value, the switching judgment is made by comprehensively considering the load situation of a macro cell and a family base station cell in the LTE/LTE-Advanced as well as the velocity of the WTRU and the user business type. The method can optimize the switching a terminal between the macro cell and the family base station cell in the LTE/LTE-Advanced, thus improving the switching success rate and reducing unnecessary switching.
Description
Technical field
The present invention relates to the mobile communication technology field, more particularly, the present invention is a kind of switching optimization method that is used between next generation mobile communication system (LTE/LTE-Advanced) eNodeB (evolved Node B) and the Home eNodeB (the evolved Node B of family).
Background technology
Along with the extensive commercialization of 3-G (Generation Three mobile communication system) and the issue of LTE (Long Term Evolution) standard, the standard formulation of the 4th third-generation mobile communication system with also arrived critical stage, as the mainstream technology in the 4th third-generation mobile communication, the leading LTE-Advanced technology of formulating of 3GPP is placed high hopes, LTE-Advanced is the evolution of LTE, formal name is called FurtherAdvancements for E-UTRA, and it is one of the two big mainstream technology schemes of the IMT-Advanced collection of ITU-R.
In LTE-Advanced, effectively support new frequency range and big bandwidth applications, peak rate significantly improves, spectrum efficiency also has improvement, bandwidth is wideer, speed is faster, meanwhile, better the network coverage becomes one of important demand, according to ASSOCIATE STATISTICS both domestic and external, the voice service in 3G epoch 70% and 90% data service occur in indoor, and sufficient indoor covering not only can provide service more easily to the user, and the fixed capital that more can save operator drops into expense, the income of raising operator.In order to realize that better internal home network covers and network capacity expands, LTE-Advanced has introduced Home eNodeB (the evolved Node B of family, also claim Femtocell, Home eNodeB, HeNB), with respect to the evolved Node B (eNodeB) among the LTE/LTE-Advanced, the Home eNodeB volume is little, and transmitting power is lower, plug and play, make things convenient for user installation and maintenance, saved operating cost of operator, disposed on a large scale possibly in the near future.At present a lot of trans-corporations and domestic each big operator, equipment commercial city give the great concern of Home eNodeB.
Be accompanied by the large scale deployment of Home eNodeB, the mobile management of terminal becomes a stubborn problem, particularly when terminal from the source macrocell of LTE/LTE-Advanced when home base station cells moves, can produce the necessity problem of one switching, may not need to switch such as the user under the fast state, because the limited coverage area of Home eNodeB, highspeed user's switching can cause twice switching unnecessary, active user and non real-time user's unnecessary switchover policy may cause the failure of switching under medium speed's condition, the switching that there is no need, a series of problems such as cutting off rate, low speed user may be wished the fast as far as possible home base station cells and resident as far as possible for a long time that switches to; In addition, the power of Home eNodeB is less, and the evolved Node B power ratio among the LTE/LTE-Advanced is bigger, the capacity of the two also has than big-difference simultaneously, in handoff procedure as do not consider the difference of the two capacity and power, may cause that table tennis switches etc., influence quality of services for users, and the changing method of in present macrocell and the switching between the home base station cells, also not tackling different user speed and business state information and considering the two capacity and power difference.
Summary of the invention
The present invention is intended to the problem switched between the LTE/LTE-Advanced macrocell of the fine solution of failing in the existing mobile communication handoff technique and the home base station cells, has proposed a kind of changing method based on sub-district present load, user velocity and business state information.
To achieve these goals, solve the corresponding techniques problem, the present invention is achieved through the following technical solutions:
Step 1: the evolved Node B control WTRU in source (wireless transmitter/receiver unit) triggered according to Event triggered, cycle or periodically the mode of Time Triggered sends load information from terminal to the evolved Node B in source, velocity information and business state information.
Step 2: reference signal receiving intensity or Reference Signal Received Quality that the evolved Node B in source receives the WTRU transmission satisfy switching condition, the evolved Node B in source is made when home base station cells switches decision, the evolved Node B in source sends handoff request and sends to femto gateway system (perhaps other Home eNodeB switch decision systems), speed and business state information with WTRU sends to femto gateway system (perhaps other Home eNodeB switch decision systems) simultaneously, enters next step.
Step 3: judge whether Home eNodeB allows this user to insert, if what Home eNodeB adopted is CSG (closed user group) pattern, whether what the femto gateway system judged at first whether this WTRU belong to that this closed user group or Home eNodeB adopt is open access module, and what this WTRU belonged to that this closed user group or Home eNodeB adopt is that open access module then carries out next step.
Step 4: speed state and business information state according to current LTE/LTE-Advanced source macrocell and home base station cells loading condition, WTRU judge whether switch.Satisfy switching condition then WTRU switch to the target BS sub-district from the source macrocell, do not satisfy and then do not carry out switching.Take all factors into consideration in the switch decision process and switch the loading condition that relates to source macrocell and target home base station cells, realize that by the handover measurement information processing reference signal receiving intensity of LTE/LTE-Advanced source macrocell and home base station cells loading condition and WTRU or Reference Signal Received Quality combine as switch decision to be imported.
Consider the switching of source macrocell and target home base station cells loading condition in the step 4, be specially the switch decision input and be proportional to source macrocell and target home base station cells reference signal strength or reference signal quality separately, be inversely proportional to source macrocell and the target home base station cells cell load factor separately, be proportional to source macrocell and target home base station cells maximum load capacity separately.
Step 5: in technique scheme, femto gateway is made the decision of whether accepting switch decision according to User Identity and speed and business state information.Being specially a WTRU speed is divided three classes: at a high speed, middling speed and low speed; The WTRU service condition is divided into two kinds: real time business and non-real-time service.Satisfy under the situation of the condition in the step 4, high-speed real-time and high speed non real-time WTRU do not switch, and the middling speed active user switches, and middling speed non real-time user is not switched, and low speed active user and low speed non real-time user are switched.
In step 5, WTRU speed also can be simplified and is divided into two classes: at a high speed and low speed, this moment, the highspeed user was not switched, and low speed user switches.Thereby reduce switching unnecessary, reduce cutting off rate, realize the optimization of switching between LTE/LTE-Advanced macrocell and the home base station cells.
As can be seen from the above technical solutions, technical scheme of the present invention is by taking all factors into consideration velocity information state and the auxiliary switch decision of making of business information state based on LTE/LTE-Advanced macrocell and home base station cells load, user.Thereby realize the handover optimization of macrocell to family's base station cell.
Below by the drawings and specific embodiments technical scheme of the present invention is further set forth.
Description of drawings
In order to set forth embodiments of the invention and existing technical scheme more clearly, below the explanation accompanying drawing of using in technical scheme explanation accompanying drawing of the present invention and the description of the Prior Art is done simple introduction, conspicuous, under the prerequisite of not paying creative work, those of ordinary skills can obtain other accompanying drawing by this accompanying drawing.
Fig. 1 is the switching flow figure of load Network Based, user velocity and service condition in the embodiment of the invention one;
Fig. 2 is the switching flow figure of load Network Based, user velocity and service condition in the embodiment of the invention two;
Fig. 3 is the switching flow figure of load Network Based, user velocity and service condition in the embodiment of the invention three.
Embodiment
Clearer for what technical scheme advantage of the present invention was described, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail, obvious described embodiment is part embodiment of the present invention, rather than whole embodiment, move to MME or Home eNodeB place such as the position that embodiments of the invention are disposed.According to embodiments of the invention, those of ordinary skill in the art can realize every other embodiment of the present invention on without the basis of creative work, all belong to protection scope of the present invention.
Main thought of the present invention is, according to the network load condition of current LTE/LTE-Advanced macrocell and home base station cells, user's speed state information and business state information, judge whether the user is necessary to switch to home base station cells from the LTE/LTE-Advanced macrocell, reduce unnecessary switching, thereby optimize switching from the LTE/LTE-Advanced macrocell to family's base station cell.
" WTRU " that is hereinafter quoted belongs to but be not limited to beep-pager, travelling carriage, cell phone, net book, travelling carriage, fixing or mobile contracted user unit, PDA(Personal Digital Assistant), computer or other subscriber equipment or the terminals that can use under wireless environment.The term of hereinafter quoting " evolved Node B " then is to comprise but do not belong to eNodeB, base station, evolved base station, site controller, Node B, access point (Access Point) or other any interface equipments that can work in wireless environment.
Fig. 1 is the particular flow sheet of the embodiment of the invention one, specifically comprises:
Step 101: evolved Node B receives the metrical information of WTRU and reporting of speed and business state information.
Business state information in this step can report evolved Node B by simple identifier by WTRU, and the speed state information of WTRU can be obtained or be estimated according to Doppler frequency shift by GPS.
Whether signal quality or intensity that step 102:WTRU measures satisfy handoff threshold.
The power of considering Home eNodeB is less, and for the fairness that realizes switching, the present invention adopts following processing method to signal strength signal intensity and the signal quality measured values that WTRU reports:
Wherein the value of Mo is home base station cells or the RSRP (Reference Signal Received Power) of LTE/LTE-Advanced macrocell or the value of RSRQ (Reference Signal Received Quality) that the WTRU measurement reports, log (e*k+n) is the load factor of home base station cells and person LTE/LTE-Advanced source macrocell, e is constant 2.7182818284590 (e can change other values greater than e into here), n is the WTRU number (cell load just) that resides in home base station cells or LTE/LTE-Advanced source macrocell, k is the regulatory factor that the difference according to cell type/scale designs, N is the heap(ed) capacity of LTE/LTE-Advanced macrocell or home base station cells, and G is a regulatory factor.
That be used at last adjudicate is M, judges whether the M value of source macrocell satisfies handoff threshold, satisfies entering next step.
Step 103: whether Home eNodeB is user's white list that open mode or this WTRU belong to closed mode, if then carry out next step.
Step 104: whether this WTRU is highspeed user's (for example 30 kilometer per hours) and is is accepting non-real-time service (such as downloading service), then enter next step.
Step 105:WTRU switches to the target home base station cells from LTE/LTE-Advanced source macrocell.
Fig. 2 is the particular flow sheet of the embodiment of the invention two, specifically comprises:
Step 201: evolved Node B receives the metrical information of WTRU and reporting of speed and business state information.
Business state information in this step can report evolved Node B by simple identifier by WTRU, and the speed state information of WTRU can be obtained or be estimated according to Doppler frequency shift by GPS.
Whether signal quality or intensity that step 202:WTRU measures satisfy handoff threshold.
The power of considering Home eNodeB is less, and for the fairness that realizes switching, the present invention adopts following processing method to signal strength signal intensity and the signal quality measured values that WTRU reports:
Wherein the value of Mo is home base station cells or the RSRP (Reference Signal Received Power) of LTE/LTE-Advanced macrocell or the value of RSRQ (Reference Signal Received Quality) that the WTRU measurement reports, log (e*k+n) is the load factor of home base station cells and person LTE/LTE-Advanced source macrocell, e is constant 2.7182818284590 (e can change other values greater than e into here), n is the WTRU number (cell load just) that resides in home base station cells or LTE/LTE-Advanced source macrocell, k is the regulatory factor that the difference according to cell type/scale designs, N is the heap(ed) capacity of LTE/LTE-Advanced macrocell or home base station cells, and G is a regulatory factor.
That be used at last adjudicate is M, judges whether the M value of source macrocell satisfies handoff threshold, satisfies entering next step.
Step 203: whether Home eNodeB is user's white list that open mode or this WTRU belong to closed mode, if then carry out next step.
Step 204: whether this WTRU is highspeed user's (for example 30 kilometer per hours, this thresholding is adjustable), then enters next step.
Step 205:WTRU switches to the target home base station cells from LTE/LTE-Advanced source macrocell.
Fig. 3 is the particular flow sheet of the embodiment of the invention three, specifically comprises:
Step 301: evolved Node B receives the metrical information of WTRU and reporting of speed and business state information.
Business state information in this step can report evolved Node B by simple identifier by WTRU, and the speed state information of WTRU can be obtained or be estimated according to Doppler frequency shift by GPS.
Whether signal quality or intensity that step 302:WTRU measures satisfy handoff threshold.
The power of considering Home eNodeB is less, and for the fairness that realizes switching, the present invention adopts following processing method to signal strength signal intensity and the signal quality measured values that WTRU reports:
Wherein the value of Mo is home base station cells or the RSRP (Reference Signal Received Power) of LTE/LTE-Advanced macrocell or the value of RSRQ (Reference Signal Received Quality) that the WTRU measurement reports, log (e*k+n) is the load factor of home base station cells and person LTE/LTE-Advanced source macrocell, e is constant 2.7182818284590 (e can change other values greater than e into here), n is the WTRU number (cell load just) that resides in home base station cells or LTE/LTE-Advanced source macrocell, k is the regulatory factor that the difference according to cell type/scale designs, N is the heap(ed) capacity of LTE/LTE-Advanced macrocell or home base station cells, and G is a regulatory factor.
That be used at last adjudicate is M, judges whether the M value of source macrocell satisfies handoff threshold, satisfies entering next step.
Step 303: whether Home eNodeB is user's white list that open mode or this WTRU belong to closed mode, if then carry out next step.
Step 304: whether this WTRU is highspeed user's (for example 30 kilometer per hours, this thresholding is adjustable) or is middling speed (for example 15 kilometer per hours are to 30 kilometer per hours, and this thresholding is adjustable) non real-time user, then enter next step.
Step 305:WTRU switches to the target home base station cells from LTE/LTE-Advanced source macrocell.
More than be to specifying of embodiment of the invention core concept and unrestricted, in concrete implementation process, can do suitable improvement to method of the present invention, to adapt to the needs of concrete condition, those of ordinary skill in the art can be with reference to the embodiment of the invention by simple substitutions and modifications, and do not break away from the category of technical solution of the present invention.
Claims (10)
1. switching handling method is characterized in that may further comprise the steps:
Step 1:WTRU reports velocity information and the business state information of WTRU to the evolved Node B in source.
Step 2: the evolved Node B in source judge the LTE/LTE-Advanced source macrocell that receives and home base station cells signal strength signal intensity or signal quality and separately the switch decision input that obtains of the cell load factor whether satisfy switching condition, satisfy switching condition, then carry out next step.
Step 3: whether Home eNodeB allows WTRU to insert, if allow WTRU to insert, then enters next step.
Step 4: judge whether the speed state of WTRU and business information state are fit to switch, suitable then switching enters next step.
Step 5:WTRU switches to the target home base station cells from the source macrocell.
2. switching handling method according to claim 1 is characterized in that:
In the described step 1, WTRU comprises velocity information and the business state information of WTRU in the evolved Node B reporting message in source.
3. switching handling method according to claim 1 is characterized in that:
In the described step 2, the reference signal receiving intensity of LTE/LTE-Advanced source macrocell and home base station cells loading condition and WTRU or Reference Signal Received Quality combine as switch decision to be imported, the evolved Node B in source judges that it does not satisfy switching condition, then returns step 1; Satisfy switching condition and then enter step 3.
4. switching handling method according to claim 3 is characterized in that:
The method that the reference signal receiving intensity of LTE/LTE-Advanced source macrocell and home base station cells loading condition and WTRU or Reference Signal Received Quality combine as the switch decision input is specially:
The switch decision input is proportional to source macrocell and target home base station cells reference signal strength and reference signal quality separately, be inversely proportional to source macrocell and the target home base station cells cell load factor separately, be proportional to source macrocell and target home base station cells maximum load capacity separately.
5. switching handling method according to claim 4 is characterized in that:
LTE/LTE-Advanced source macrocell and the target home base station cells cell load factor separately is specially: LTE/LTE-Advanced source macrocell and target home base station cells separately cell load (the resident WTRU number of current area) or be the expression formula of LTE/LTE-Advanced source macrocell and target home base station cells cell load (the resident WTRU number of current area) separately.
6. switching handling method according to claim 1 is characterized in that:
In the described step 3, whether Home eNodeB allows the concrete grammar of WTRU access to be, WTRU is in the white list of Home eNodeB, and what perhaps Home eNodeB adopted is open mode, then returns step 1.
7. switching handling method according to claim 1 is characterized in that:
Described step 4 is specially, and judges that the speed state of WTRU and the principle whether service condition is fit to switch are, high speed WTRU does not switch, and middling speed non real-time WTRU does not switch, and the real-time WTRU of middling speed switches, and low speed WTRU switches.
8. switching handling method according to claim 7 is characterized in that:
Judge that the speed state of WTRU and the principle whether service condition is fit to switch can be reduced to, high speed WTRU does not switch, and low speed WTRU switches, and does not consider the WTRU business information.
9. switching handling method according to claim 7 is characterized in that:
High speed WTRU defines span more than 30 kilometer per hours, middling speed WTRU define span at 15 kilometer per hours between 30 kilometer per hours, the speed span of low speed WTRU is at 0 to 15 kilometer per hour.
10. switching handling method according to claim 8 is characterized in that:
To between 30 kilometer per hours, be lower than this thresholding is low speed WTRU to the decision threshold span of high speed WTRU and low speed WTRU at 15 kilometer per hours, and being higher than this thresholding is high speed WTRU.
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| US9603087B2 (en) | 2011-10-18 | 2017-03-21 | Broadcom Corporation | Green femtocells and methods of implementing the same |
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| CN103068014A (en) * | 2011-10-18 | 2013-04-24 | 美国博通公司 | Wake-up of a femto base station from sleep mode and handover |
| CN103428680A (en) * | 2012-05-24 | 2013-12-04 | 中兴通讯股份有限公司 | Method and device for enabling subordination base station to provide service |
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| CN105120511A (en) * | 2015-08-31 | 2015-12-02 | 深圳市金立通信设备有限公司 | Processor control method and terminal |
| CN105120511B (en) * | 2015-08-31 | 2020-01-03 | 深圳市金立通信设备有限公司 | Processor control method and terminal |
| CN110831093A (en) * | 2018-08-14 | 2020-02-21 | 成都鼎桥通信技术有限公司 | Method and device for switching service network of cluster terminal |
| CN112187380A (en) * | 2019-07-01 | 2021-01-05 | 中国移动通信集团浙江有限公司 | Serving cell switching method and device |
| CN112187380B (en) * | 2019-07-01 | 2023-04-07 | 中国移动通信集团浙江有限公司 | Serving cell switching method and device |
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