CN102781042A - LTE (long term evolution) load balancing method based on physical cell identity - Google Patents
LTE (long term evolution) load balancing method based on physical cell identity Download PDFInfo
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Abstract
The invention relates to an LTE (long term evaluation) load balancing method based on a physical cell identity, which comprises the steps that a cell identity which is a load-aware physical cell identity (LA-PCI for short) is used in a cell synchronization signal (PSS (primary synchronization signal) and SSS (secondary synchronization signal)); a user at idle state can obtain the LA-PCI by detecting the cell synchronization signal so as to sense the load level of the cell; and the user terminal can preferentially select a cell with lower load level in a cell selection/reselection stage, thereby automatically balancing the load distribution of cells. The LTE load balancing method based on the physical cell identity has the advantage that the user can actively sense the load level of the cell, know the load condition of the current cell at idle state and before access, select an appropriate cell according to the cell selection/reselection criterion, preferentially resides in a cell which conforms to the reselection conditions and has lower load level, and relieve the condition of uneven load distribution of the cell in advance, thereby realizing the purpose of making full use of total resources of the system.
Description
Technical field
The present invention relates to a kind of LTE load-balancing method, especially relate to a kind of LTE load-balancing method based on Physical Cell Identifier.
Background technology
LTE is the Long Term Evolution of UMTS 3-G (Generation Three mobile communication system); By high efficiency multicarrier, multi-antenna transmitting transferring technology and air interface scheduling mechanism flexibly; Under the 20MHz carrier bandwidths, can provide descending hardware circuit solution up to 100Mbps, 10ms with interior user plane time delay, a sub-district can be supported 400 state of activation subscriber equipmenies (UE) at least.In order on limited air interface resource, to reach these Key Performance Indicators; LTE system base-station (eNodeB) need carry out efficient radio resource management (RRM), comprises aspects such as admitting between the technological system of control, radio bearer management, Dynamic Resource Allocation for Multimedia, mobile management, load balancing, Inter-Cell Interference Coordination, employing different radio (inter-RAT) RRM.
Load balancing is a RRM function from unequal loading level between the system perspective balance sub-district; Effect is that customer service is transferred to the lower sub-district of contiguous load from the higher sub-district of load; Make full use of the capacity of each sub-district, improve the entire system resource utilization.
The conventional means that realizes load balancing is: cell base station is (for example through X2 interface exchange load information) on the basis of the load of perception adjacent cell; Appropriate cell is set switches and cell selecting/reselecting parameters, make and activate or free subscriber switching or resident from the high capacity sub-district to suitable low load adjacent area.
Physical Cell Identifier (PCI) is a physical label that the LTE sub-district is unique within the specific limits, is mainly used in many important events such as signature (scrambling) processing of physical-layer cell control information (for example synchronizing signal, reference symbol etc.) and transfer of data.Can use 504 PCI in the LTE system, be divided into 168 PCI groups, each PCI group comprises 3 PCI values.The PCI value of LTE sub-district is confirmed by the interior numbering of PCI group # and group is common.Neighbor cell must use different PCI, to avoid conflict; The different adjacent area PCI of a sub-district can not repeat, and avoid occurring obscuring.The user can confirm (comprising master sync signal (PSS) and auxiliary synchronous signals (SSS)) PCI. of sub-district through reading the cell synchronizing signal before inserting the sub-district
Summary of the invention
The present invention mainly is the load skewness that solves each sub-district of existing in prior technology LTE system; The service request that the cell load level that possibly have is higher, can't satisfy more users, and the adjacent cell load is lower, the situation that has idling-resource to use.If idle condition user resides in the high capacity sub-district, be switched to other sub-districts probably after inserting, increase the signaling and the processing expenditure technical problem of high capacity sub-district; A kind of user's active perception cell load level that can let is provided; Before idle condition, access, just understand the load state of current area; Select proper cell in conjunction with cell selecting/reselection; Preferentially reside in the relatively low sub-district of according with reselection conditions and load, alleviate cell load situation pockety in advance, thereby reach a kind of LTE load-balancing method of the purpose that makes full use of the overall system resource based on Physical Cell Identifier.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals:
A kind of LTE load-balancing method based on Physical Cell Identifier is characterized in that, just like giving a definition:
Definition 1: 504 kinds of PCI values are divided into the subclass A of three identical sizes, B, C, PCI value among the subclass A can only be used in each sub-district, and this PCI value is used for all other occasions except that the cell synchronizing signal;
Definition 2: the cell synchronizing signal uses special LA-PCI value, and its span is whole 504 kinds of PCI values;
Definition 3: be PCI subclass A; B, C set up following related: each the PCI value among the subclass A, each PCI value among relevant subset B and the subclass C respectively; Wherein the PCI value that equals among the subclass A of the PCI value among the subclass B adds 168, and the PCI value that the PCI value among the subclass C equals among the subclass A adds 336;
Definition 4: the synchronizing signal of each sub-district can be used three kinds of LA-PCI values; They belong to PCI subclass A respectively; B; C, the LA-PCI value that wherein belongs to subclass A equals the PCI value of this sub-district, belongs to the LA-PCI value of subclass B and subclass C and the incidence relation of the satisfied definition 3 of the LA-PCI value that belongs to subclass A;
Step is following:
Step 1, each sub-district belong to unique PCI value of PCI subclass A according to the network planning or self-organization of network functional configuration.
Step 2; Each sub-district is provided with the LA-PCI value that synchronizing signal adopts according to load, and when hanging down load, LA-PCI equals sub-district PCI and promptly belongs to PCI subclass A; During load the LA-PCI value equal sub-district PCI and add 168; Promptly belong to PCI subclass B, the LA-PCI value equals sub-district PCI value and adds 336 during the high capacity level, promptly belongs to PCI subclass C;
Step 3, the horizontal grade of cell load change and after stable lasting a period of time (duration can be determined by base station eNodeB), upgrade the LA-PCI value that synchronizing signal adopts.
At above-mentioned a kind of LTE load-balancing method, also comprise the step of selecting persistent district after near the synchronizing channel of the sub-district idle condition scanning input, that is: based on Physical Cell Identifier
After the synchronizing channel of sub-district, read the LA-PCI value near the step 4, idle condition scanning input.If the LA-PCI value belongs to subclass A, then with its sub-district PCI value as identification; If the LA-PCI value belongs to subclass B or subclass C, the PCI value of then confirming among the related with it subclass A according to definition 3 is as the sub-district PCI value that identifies;
Step 5, which PCI set idle condition user belongs to according to the LA-PCI value, confirms the load of sub-district; And combine cell selecting/gravity treatment principle, preferentially select the lower sub-district of load resident.
Therefore; The present invention has following advantage: can let user's active perception cell load level; Before idle condition, access, just understand the load state of current area, select proper cell, preferentially reside in the relatively low sub-district of according with reselection conditions and load in conjunction with cell selecting/reselection; Alleviate cell load situation pockety in advance, thereby reach the purpose that makes full use of the overall system resource.
Description of drawings
A kind of LTE system many cell scenario sketch map that Fig. 1 provides for the embodiment of the invention;
The schematic flow sheet of district reselecting takes place in the free subscriber that Fig. 2 provides for the embodiment of the invention when in scene shown in Figure 1, moving;
Fig. 3 is a kind of LTE load-balancing mechanism schematic flow sheet based on Physical Cell Identifier provided by the invention.
Fig. 4 is the system schematic flow sheet that a kind of LTE system cell provided by the invention was provided with and upgraded load and load perception Physical Cell Identifier.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
At first introduce several definition of the present invention:
For the ease of distinguishing the load state of different districts, cell load is horizontally disposed with basic, normal, high three kinds of grades, the concrete criteria for classifying can by the base station realize decision (for example according to sub-district excited users quantity, carry peak transfer rate and etc. factor); 504 PCI values (168 PCI groups) of LTE standard code are divided into A, B, C three sub-set, respectively corresponding these three kinds of load, as shown in the table.
The PCI subclass | PCI value scope | PCI group # scope | Load |
Subclass A | 0~167 | 0~55 | |
Subclass B | |||
168~335 | 56~111 | In | |
|
336~504 | 112~167 | High |
On the basis of last table PCI scope division, PCI scope and the occupation mode that use the sub-district are done like delimit:
Definition 1: PCI value among the subclass A can only be used in each sub-district, and this PCI value is used for all other occasions except that the cell synchronizing signal;
Definition 2: the cell synchronizing signal uses special LA-PCI value, and its span is whole 504 kinds of PCI values;
Definition 3: be PCI subclass A; B, C set up following related: each the PCI value among the subclass A, each PCI value among relevant subset B and the subclass C respectively; Wherein the PCI value that equals among the subclass A of the PCI value among the subclass B adds 168, and the PCI value that the PCI value among the subclass C equals among the subclass A adds 336.As shown in the table:
Definition 4: the synchronizing signal of each sub-district can be used three kinds of LA-PCI values; They belong to PCI subclass A, B, C respectively; The LA-PCI value that wherein belongs to subclass A equals the PCI value of this sub-district, belongs to the LA-PCI value of subclass B and subclass C and the incidence relation of the satisfied definition 3 of the LA-PCI value that belongs to subclass A.
For example: certain cell configuration PCI value is 5, and its synchronizing signal can be used following three kinds of LA-PCI values: the PCI 5 among the subclass A, or the PCI among the subclass B 173, or the PCI among the subclass C 341.
Based on above definition, idle condition user can discern the LA-PCI value of a sub-district through the detected cells synchronizing signal, belongs to which PCI subclass based on it again, the load that just can know this sub-district be low, in still be height.Understand after the cell load level, the user can preferentially select to reside in the lower sub-district of load, thereby reaches the purpose of load balancing.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is carried out clear, intactly description.Based on the embodiment among the present invention, those of ordinary skills are not making all other embodiment that obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of LTE load-balancing mechanism based on Physical Cell Identifier; Mainly be to use the PCI value that embodies the different loads level through the cell synchronizing signal; Make the direct perception of user terminal sub-district present load level, thereby make suitable resident selection.Below be elaborated.
A kind of many cell scenario that are applicable to the embodiment of the invention are at first described, as shown in Figure 1.
In LTE system access network 100, comprise three sub-districts 105
1, 105
2With 105
3Corresponding base station (eNodeB) is 110
1, 110
2With 110
3Suppose sub-district 105
1Load be low, sub-district 105
2Load be high, sub-district 105
3Load do.
Subscriber equipment (UE) 120 is under the idle condition, moves passage in transit 125 along track 130
1, 125
2, 125
3, 125
4Deng the position.Along with the variation of UE present position, it receives from each signal of base station power and can change, and which sub-district UE resides in according to cell selecting/gravity treatment principle decision.
The change procedure of persistent district is as shown in Figure 2 when UE being described below in scene shown in Figure 1, moving.
210, UE is in the position 125
1The time, because apart from base station 110
1Recently, sub-district 105 so under the normal condition
1Received signal quality best; And this cell load level is " low ", so UE will reside in sub-district 105
1.
220, UE moves to position 125
2The time, former persistent district 105
1Received signal quality variation gradually, and neighbor cell 105
2The quality of reception improve gradually, and possibly satisfy the district reselecting condition.
230, judge in flow process 220 adjacent area 105
2Whether also meet district reselecting criterion condition, if change flow process 240 over to, otherwise change flow process 260. over to
240, the adjacent area 105
2Load be " height ", and adjacent area 105
3Load be " in ", so satisfy under the condition of district reselecting criterion sub-district 105 at the same time
3Priority higher, so UE can select to reside in the relatively low sub-district of load 105
3Like this, professional if the UE request is set up, then by sub-district 105
3Be responsible for access, and the sub-district 105 of high capacity level
2To can not increase burden, reach the purpose of load balancing.
250, after flow process 240, UE moves to position 125
3, sub-district 105
3Received signal quality become best, so UE resides in sub-district 105 with maintenance
3.
260, has only adjacent area 105
2Meet the district reselecting condition, so UE is with gravity treatment, resident to sub-district 105
2.
270, after flow process 260, when UE moves to position 125
3The time, adjacent area 105
3The quality of reception improve, meet the district reselecting condition, UE will be once more gravity treatment and reside in sub-district 125
3.
280, behind flow process 250 or 270, UE moves to position 125
4The time, still keep residing in sub-district 105
3.
Below, in conjunction with embodiment of the invention Fig. 3, the LTE system cell is realized that through configuration LA-PCI the detail flowchart of load balancing introduces.
310, cell initialization, configuration belongs to Physical Cell Identifier (PCI) value of PCI subclass A (scope 0 ~ 167).
320, eNodeB is provided with the employed LA-PCI value of synchronizing signal according to the load of sub-district.The concrete setting seen shown in Figure 4 with new technological process more.
330, near the idle condition scanning input the sub-district detects the LA-PCI value of use to the cell synchronizing signal.
340, judge whether the LA-PCI value is lower than 168, if carry out flow process 350; Otherwise continue to judge flow process 360.
350, UE thinks that this cell load level is " low ", and sub-district PCI equals LA-PCI; Change flow process 390. then over to
360, continue to judge whether the LA-PCI value is lower than 336, if carry out flow process 370; Otherwise carry out flow process 380;
370, UE think this cell load level for " in ", sub-district PCI equals LA-PCI and subtracts 168; Change flow process 390. then over to
380, UE thinks that this cell load level is " height ", and sub-district PCI equals LA-PCI and subtracts 336; Change flow process 390. then over to
390, UE, selects to reside in proper cell, to reach the purpose of load balancing in conjunction with the cell load level according to cell selecting/gravity treatment strategy.
The state transition diagram of configuration of LTE system cell and renewal load is below described, as shown in Figure 4.
410, (initial condition) this state respective cell load is " low ", and the LA-PCI value equals sub-district PCI value.
420, this state respective cell load be " in ", the LA-PCI value equals sub-district PCI value and added for 168 (belonging to PCI subclass B).
430, this state respective cell load is " height ", and the LA-PCI value equals sub-district PCI value and added for 336 (belonging to PCI subclass C).
440, the condition that state transitions takes place is: cell load be increased to and surpass " in " load thresholding (adding certain amount of hysteresis) and lasting a period of time.
450, the condition of generation state transitions is: cell load is increased to and surpasses " height " load thresholding (adding certain amount of hysteresis) and lasting a period of time.
460, the condition of generation state transitions is: cell load is reduced to and is lower than " height " load thresholding (deducting certain amount of hysteresis) and lasting a period of time.
470, the condition that state transitions takes place is: cell load be reduced to and be lower than " in " load thresholding (deducting certain amount of hysteresis) and lasting a period of time.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (2)
1. the LTE load-balancing method based on Physical Cell Identifier is characterized in that, just like giving a definition:
Definition 1: 504 kinds of PCI values are divided into the subclass A of three identical sizes, B, C, PCI value among the subclass A can only be used in each sub-district, and this PCI value is used for all other occasions except that the cell synchronizing signal;
Definition 2: the cell synchronizing signal uses special LA-PCI value, and its span is whole 504 kinds of PCI values;
Definition 3: be PCI subclass A; B, C set up following related: each the PCI value among the subclass A, each PCI value among relevant subset B and the subclass C respectively; Wherein the PCI value that equals among the subclass A of the PCI value among the subclass B adds 168, and the PCI value that the PCI value among the subclass C equals among the subclass A adds 336;
Definition 4: the synchronizing signal of each sub-district can be used three kinds of LA-PCI values; They belong to PCI subclass A respectively; B; C, the LA-PCI value that wherein belongs to subclass A equals the PCI value of this sub-district, belongs to the LA-PCI value of subclass B and subclass C and the incidence relation of the satisfied definition 3 of the LA-PCI value that belongs to subclass A;
Step is following:
Step 1, each sub-district belong to unique PCI value of PCI subclass A according to the network planning or self-organization of network functional configuration;
Step 2; Each sub-district is provided with the LA-PCI value that synchronizing signal adopts according to load, and when hanging down load, LA-PCI equals sub-district PCI and promptly belongs to PCI subclass A; During load the LA-PCI value equal sub-district PCI and add 168; Promptly belong to PCI subclass B, the LA-PCI value equals sub-district PCI value and adds 336 during the high capacity level, promptly belongs to PCI subclass C;
Step 3, the horizontal grade of cell load change and stable continuing upgrades the LA-PCI value that synchronizing signal adopts after a period of time.
2. a kind of LTE load-balancing method based on Physical Cell Identifier according to claim 1 is characterized in that, also comprises the step of selecting persistent district after near the synchronizing channel of the sub-district idle condition scanning input, that is:
After the synchronizing channel of sub-district, read the LA-PCI value near the step 4, idle condition scanning input;
If the LA-PCI value belongs to subclass A, then with its sub-district PCI value as identification; If the LA-PCI value belongs to subclass B or subclass C, the PCI value of then confirming among the related with it subclass A according to definition 3 is as the sub-district PCI value that identifies;
Step 5, which PCI set idle condition user belongs to according to the LA-PCI value, confirms the load of sub-district; And combine cell selecting/gravity treatment principle, preferentially select the lower sub-district of load resident.
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Wuhan post and Telecommunications Science Research Institute Co., Ltd. Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Inst. of Post & Telecom Science |