CN1437416A - Method of raising successive mobile station accessing rate in mobile communication system - Google Patents
Method of raising successive mobile station accessing rate in mobile communication system Download PDFInfo
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Abstract
A method to raise entering success rate of mobile station in mobile communication system is to measure the signal quality of adjacent area base station of the current area after the mobile station is stayed at the current area and it will select the adjacent area which signal quality is in accordance with the set condition to fetch its system broadcast information as well as to select proper area as an entering candidate area according to the registering authorization in system broadcast information. The mobile station will maintain the relative information of entering candidate area so that the mobile station can entercommunication system through entering the candidate area for normal communication when the mobile station is required at communication but the communication system can not be entered through the current areary.
Description
Technical field
The present invention relates to improve in a kind of moving communicating field the method that travelling carriage inserts success rate.
Background technology
In mobile communication system, mobile in each adjacent sub-district as the travelling carriage of mobile communication terminal, each sub-district is provided with a base station, and travelling carriage communicates with other travelling carriages or fixed-line subscriber by connecting with the base station.Travelling carriage enters completing place, a certain sub-district register after, in this sub-district, and enter idle condition with regard to resident, this sub-district is the current area of travelling carriage.
Under idle condition, if sub-district of travelling carriage moves to another sub-district, travelling carriage is carried out the subdistrict position renewal process, perhaps need the paging that cell base station comes is replied, perhaps this travelling carriage needs with other travelling carriage or is fixed for setting up calling, comprise service request, the request of sending SMS message etc., then travelling carriage can send insert request to the current area base station; Random access procedure is by Mobile Origination; Travelling carriage sends the request of access to cell base station on Random Access Channel, carry out access exploration; Network side is recalled channel assignment message to travelling carriage on a common signal channel after the access request of receiving travelling carriage, travelling carriage and base station are mutual at the enterprising line data of specific dedicated channel that distributes then.The Mobile Origination random access procedure, it is access-in resource according to the current area base station, according to specific algorithm, in available access-in resource, select access slot, this selection is at random, sends access exploration with specific power to current resident cell base station at specific time slot then, receive the access exploration of travelling carriage when cell base station after, cell base station just sends one and inserts Indication message to travelling carriage, shows whether current mobile station inserts success.Get nowhere if insert at random, travelling carriage then can't carry out data interaction with current sub-district so, can not finish the function of conversation or transfer of data.
In present mobile communication system, the resident current area of travelling carriage remains one, and the access slot resource of a cell base station is limited, insert a base station simultaneously as a plurality of travelling carriages, and when select selecting access slot at random, access interference takes place probably, causes the access procedure failure; Especially intensive and this situation of hot zones very easily takes place in urban population.In addition,, also may refuse the access request of other travelling carriages, cause other travelling carriages to connect, carry out proper communication with current cell base station if the cell base station present load is bigger.And, travelling carriage only limits to insert in its resident current area in the prior art, if travelling carriage can't insert by current area, even having idle access-in resource and allow, neighbor cell inserts, this travelling carriage also can't utilize, therefore, prior art does not make full use of the access-in resource of whole system, to improve the access success rate of travelling carriage.
Summary of the invention
The purpose of this invention is to provide and improve the method that travelling carriage inserts success rate in a kind of mobile communication system, can be when its resident current area can't insert to guarantee travelling carriage by the access-in resource access mobile communication system of neighbor cell free time.
The object of the present invention is achieved like this: improve the method that travelling carriage inserts success rate in the mobile communication system, comprising:
(1) location registers and registration are carried out in sub-district of mobile station in selecting, and this sub-district is as the resident current area of travelling carriage;
(2) the neighbor cell base station signal quality of moving table measuring current area selects signal quality to meet the neighbor cell of setting situation, reads the system broadcast message of this sub-district;
(3) according to the relevant information in the system broadcast message, select satisfactory sub-district as inserting candidate cell, travelling carriage is safeguarded the relevant configuration information that inserts candidate cell;
(4) when travelling carriage has communication requirement, travelling carriage sends the request of access to the current area base station, initiates random access procedure, if the random access procedure success, then travelling carriage carries out information interaction on current area, otherwise, execution in step (5);
(5) travelling carriage sends the request of access to inserting the candidate cell base station, initiates random access procedure, if the random access procedure success, then travelling carriage carries out information interaction on this access candidate cell, otherwise epicycle inserts the request failure.
Relevant information in the system broadcast message in the described step (3) comprises: the relevant information of registration information, access service grade and base station physical layer.
Described step (5) also comprises the processing procedure when it is a plurality of inserting candidate cell, comprising:
(31) travelling carriage sends the request of access to inserting the candidate cell base station, if the random access procedure success, then travelling carriage carries out information interaction on this access candidate cell, otherwise, carry out (32);
(32) judge whether travelling carriage exists in epicycle and insert in the request process not through initiating the access candidate cell of random access procedure, if any carrying out (31), otherwise epicycle inserts the request failure.
Described method also comprises the renewal process that inserts candidate cell, and inserting candidate cell is to upgrade according to the measurement result of a new neighbor cell base station signal quality.
Described measurement cell base station signal quality is signal strength parameter and a signal to noise ratio parameter of measuring the cell base station signal.
Described travelling carriage safeguards that the relevant configuration information that inserts candidate cell comprises: the synchronizing information of cell base station, timing information and access-in resource information.
Described Mobile Origination random access procedure comprises:
(71) travelling carriage is selected an access slot at random according to inserting algorithm at random in the access slot resource that base station cell can be used;
(72) according to the transmitting power of base station cell configuration,, send the request of access to this cell base station at selected access slot place;
(73) the access request-reply of wait cell base station; If travelling carriage receives replying of cell base station, allow to insert, then random access procedure success, otherwise, execution in step (74);
(74) judge whether cell base station allows travelling carriage to send new access request,, then carry out (75) if allow, otherwise, the failure of epicycle random access procedure;
(75) select an access slot again at random, send to cell base station and insert request, execution in step (73) at random.
By such scheme as can be seen, when the resident current area of travelling carriage is that the load of Hot Spot or this sub-district is saturated, when the random access procedure that travelling carriage is initiated at current area is failed, travelling carriage can insert the candidate cell base station to it and send the request of access, initiate random access procedure, and be linked in the mobile communication system by inserting the candidate cell base station.Method of the present invention can make full use of the access-in resource in the communication system,, improves travelling carriage widely and inserts success rate under the access-in resource condition of limited thereby make in communication system.
Description of drawings
Fig. 1 is for inserting the process flow diagram of setting up of candidate cell collection in the method for the present invention;
Fig. 2 process flow diagram that method of the present invention inserts for travelling carriage utilizes;
Fig. 3 is in the schematic diagram in each sub-district for travelling carriage moves.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is illustrated.
Improve the method that travelling carriage inserts success rate in the mobile communication system of the present invention, travelling carriage at first needs to set up one and inserts the candidate cell collection, so that can insert by the candidate cell that inserts candidate cell set when current area can't insert for travelling carriage.Referring to Fig. 1, the foundation that inserts the candidate cell collection realizes by following process:
Step 1: mobile platform started powers on;
Step 2: carry out cell selecting and finish the location registers and the registration process of cell base station;
In this processing procedure, travelling carriage finds an only cell base station by the wireless signal of each cell base station of search reception, then in enterprising line position registration of this cell base station and registration process; After travelling carriage only succeeds in registration, just can enjoy talk business and data service service that mobile communication system provides, otherwise travelling carriage can only be enjoyed extraordinary service in current sub-district, as dial 119,110 etc.; Travelling carriage is after selected only cell base station carries out location registers and succeeds in registration, and in the sub-district of current base station, this sub-district is the resident current area of travelling carriage with regard to resident; Afterwards, travelling carriage enters into a kind of idle condition, in idle condition, travelling carriage can receive the beep-page message from system, also can initiatively make a call, also can be resident in a new sub-district because move taking place subdistrict position to upgrade, above taking place, during any situation, all can trigger the Mobile Origination random access procedure;
After travelling carriage resided in current area and enters idle condition, travelling carriage read the system broadcast message of current area; System broadcast message by current area, travelling carriage obtains some configuration informations and the operable access-in resource information of current area, comprise that access service grade, random access procedure allow the number of times of initiating again and Initial Trans of base station or the like, travelling carriage is classified to these information and is preserved these information; After system broadcast message was upgraded, travelling carriage upgraded the system configuration information and the resource information of being preserved by reading system broadcast again;
Step 3: the neighbor cell base station signal quality of moving table measuring current area, comprise parameters such as measure signal intensity and signal to noise ratio, whether can satisfy the proper communication needs of travelling carriage with the signal of determining this cell base station;
Step 4: in conjunction with the signal quality measurement result of neighbor cell base station, according to predefined threshold value the signal quality of neighbor cell base station is assessed, this threshold value can be provided with as required in conjunction with concrete condition, and this threshold value can dynamically be adjusted;
Step 5: judge according to the signal quality assessment result whether the signal quality of neighbor cell base station meets the requirement of setting, judge that promptly whether the signal quality assessment result is greater than predefined threshold value, if meet the requirement of setting, execution in step 6, otherwise, search for new neighbor cell base station signal, and execution in step 3;
Step 6: the system broadcast message that reads the neighbor cell of the requirement that meets setting;
Step 7: read some relevant informations of registration information, access service grade and base station physical layer in the system broadcast message of neighbor cell, wherein register information and access service class information and writing down the relevant information of this cell base station to this mobile station login registration authority and access service priority;
Step 8: according to registration information and access service priority and physical layer relevant information, one assessment level is set, judge with this criterion whether this neighbor cell meets the demands, and decision rule comprises tripartite noodles spare at least: condition one: whether allow the Location Registration registration; Condition two: whether access service priority meets the demands; Condition three: whether the signal path loss of coming out with the physical layer associated information calculation meets the demands, if meet the requirement of decision rule, then execution in step 9, otherwise, search for new neighbor cell base station signal, and execution in step 3;
Step 9: the neighbor cell that will satisfy decision rule in the step 8 adds access candidate cell collection as inserting candidate cell, when travelling carriage in the time can't inserting by its resident current area, can insert by the access candidate cell that inserts candidate cell set, travelling carriage is being safeguarded the relevant configuration information of the cell base stations such as synchronizing information, timing information and access-in resource information that respectively insert candidate cell, and this information is to obtain from the system broadcast message of each cell base station;
Step 10: travelling carriage is safeguarded the access candidate cell collection of being set up, being comprised: safeguard the relevant information that inserts candidate cell, and insert dynamically updating of candidate cell to inserting candidate cell set;
To inserting dynamically updating of candidate cell collection is because along with the moving of travelling carriage, and the signal(l)ing condition of neighbor cell base station may grow or died down.Travelling carriage comes the monitor signal situation of change by the signal of measuring neighbor cell base station; Signal measurement work is to finish by the measuring process under the travelling carriage idle condition; The measuring process of travelling carriage is normally carried out on the common signal channel of cell base station, index parameters such as the signal strength signal intensity of main measurement cell base station common signal channel and signal to noise ratio, the measurement type of travelling carriage can be that periodic measurement, Event triggered are measured or designated cell is measured, and the measurement type of travelling carriage is by the instruction decision of communication system; Therefore, moving or the change of communication system configuration and changing along with travelling carriage; Travelling carriage constantly upgrades and inserts the candidate cell collection by the signal of measuring neighbor cell base station and the system broadcast message that reads its cell base station; Simultaneously, travelling carriage also needs synchronous renewal respectively to insert synchronizing information, timing information, the access-in resource information of candidate cell.
Just can set up an access candidate cell collection that can include a plurality of access candidate cells for travelling carriage by said process, below in conjunction with Fig. 2, the access procedure of travelling carriage among the present invention is illustrated, concrete access procedure is as follows:
Step 21: finish after the location registers of current area and registration and setting up the process that inserts the candidate cell collection, travelling carriage just is in idle condition;
Step 22: travelling carriage need communicate with other travelling carriage or landline telephone, comprising: initiate the active call process, have other travelling carriage or landline telephone to call out this travelling carriage, travelling carriage need respond situations such as base station calling;
Step 23: when step 22 situation occurring, travelling carriage is at first initiated random access procedure in its resident current area; Travelling carriage is according to inserting algorithm at random, in the access slot resource that current area can be used, select an access slot at random, transmitting power according to the current area configuration, at selected access slot place, send the request of access to the current area base station, carry out access exploration, and the wait cell base station is replied to access exploration; If travelling carriage is after the access exploration failure first time, can select another access slot again at random, again initiate second radom heuristic, allow this travelling carriage to insert until the current area base station, perhaps travelling carriage carries out the number of times of access exploration above the maximum permission access exploration number of times of current area to this travelling carriage;
Step 24: judge whether Mobile Originated access at random is successful; If termination process success at random, execution in step 26 is if the number of times of travelling carriage access exploration surpasses the maximum access exploration number of times that allows; Perhaps this sub-district does not allow this travelling carriage to insert, then travelling carriage epicycle random access procedure failure, execution in step 25;
Step 25: travelling carriage reads the access candidate cell collection of being safeguarded, judges whether insert candidate cell set exists in the access candidate cell that does not pass through access exploration in the epicycle random access procedure; If satisfactory access candidate cell is arranged, carry out 27, otherwise carry out 28;
Step 26: travelling carriage carries out follow-up information data on the dedicated channel of this cell base station assignment mutual, realizes normal course of communications; If switching condition is satisfied in the residing zone of current mobile station, and mobile communication system allows travelling carriage to switch, and then travelling carriage is carried out handoff procedure under connection status; Do not allow travelling carriage to switch if switching condition or mobile communication system are not satisfied in the residing zone of travelling carriage, then travelling carriage continues on the successful sub-district to keep and the writing to each other of cell base station inserting;
Step 27: travelling carriage is selected a base station signal quality and is inserted candidate cell preferably from satisfactory access candidate cell, initiate random access procedure in this access candidate cell; The random access procedure of travelling carriage in inserting candidate cell is identical with the random access procedure of current area, and execution in step 24 then;
Step 28: the failure of travelling carriage epicycle random access procedure, the i.e. procedure failure of this call setup of travelling carriage or respective cell base station calling.
So far, scheme of the present invention can make when travelling carriage can't insert by its resident current area, can utilize the idle access-in resource of the neighbor cell of current area to insert, realized the effective and reasonable utilization of the communication resource, improved the access success rate of travelling carriage, for the mobile subscriber provides better access service.
Now for example scheme of the present invention is described further, referring to Fig. 3:
Supposing that travelling carriage (MS) is started shooting in the sub-district at 3 places, base station powers on, MS in base station 3, begin to around all cell base stations search for, relatively the intensity of each cell base station signal is selected the strongest base station of signal one by one; Suppose that all base stations are all by constant power emission wireless signal, the MS received signal mainly depends on the path loss size, so MS receives the channel strength of other base station of signal intensity ratio of base station 3 and wants big, so MS just selects the sub-district of base station 3 as registration, completing place registration and registration process in base station 3, base station 3 is the current area of MS.
MS finishes registration in base station 3 after, read the system broadcast message of cell base station 3, obtain information such as the configuration parameter of current area base station 3 and access-in resource, and safeguard these data messages local preservation of MS, MS is resident in current area, and MS enters idle condition; If the system broadcast message of current base station 3 changes, MS comes the data message of this locality of updating maintenance by reading system broadcast again.
MS may be between each base station cell moves arbitrarily, and MS received current area base station and signal strength signal intensity of each neighbor cell base station in moving process can change; MS measures current area base station signal and neighbor cell base station signal by measuring process; MS is respectively M1, M2, M3, M4, M5 to the measurement result of base station 1, base station 2, base station 3, base station 4 and base station 5; Decision threshold Mx of signal receiving demodulation capabilities setting according to MS; Measurement result M1, M2, M4, the M5 of neighbor cell are compared with Mx respectively,, preserve the relevant information of its base station for the base station of measurement result greater than Mx; In Fig. 3, MS resides in 3 sub-districts, base station, if MS at position A, does not then have cell base station to satisfy the decision threshold requirement; If MS is in position B now, the decision threshold requirement may be satisfied in base station 5; If the MS current position is at position D, the decision threshold requirement all can be satisfied in possible base station 4 and base station 5; Can be by rationally adjusting decision threshold, dynamically the cell base station quantity of threshold requirement is satisfied in control; Also need simultaneously measurement result M3 and other measurement result of current area are compared, when moving to C place, position as MS, then M5 is maximum in the measurement result, and then the current area of MS becomes 5 sub-districts, base station.
For the cell base station that satisfies judgement, MS is according to its base station timing and synchronizing information of obtaining, its system broadcast message of demodulate reception; MS can learn whether MS is the sub-district that allows registration to the path loss and the adjacent base station of each base station, to determine the access candidate cell of MS according to the parameters such as Initial Trans of location registration information in the system broadcast message and each base station.
In a word, MS can determine a decision threshold according to network configuration parameters in the path loss of each base station, base station signal watt level that MS receives, the system broadcast message, have only the path loss, MS of base station to receive that network configuration parameters all satisfies the decision threshold requirement in base station signal size, the system broadcast message, this base station cell can be defined as inserting candidate cell, and MS joins the access candidate cell set to this sub-district in this locality; As at position B place, current persistent district remains base station 3, and the base station 5 that satisfies condition has entered in the access Candidate Set; If MS resides in the A place, position of current area, then there is not base station cell can join the access candidate cell set.
Now suppose MS at position B place, need initiate a call establishment in order to set up a talk business; MS at first in current resident cell base station 3, initiates random access procedure, and MS according to inserting selection algorithm at random, selects an access slot according to the timing information and the access slot resource of cell base station 3 at random, and sends access exploration with certain power.MS is in the random access procedure of base station 3, if the access exploration that MS is correct is received in base station 3, and replys the Indication message that allow to insert to MS, and then MS distributes on the dedicated channel of MS and data interaction is carried out in base station 3 in base station 3 according to normal flow process; If when the maximum transmission power that MS allows by base station 3 was launched, base station 3 did not still receive the access exploration of MS; Perhaps base station 3 receives the access exploration of MS, but because the very serious or other reasons of load of current area, and base station 3 is replied to one of MS and do not allowed the Indication message that inserts; Perhaps, cause base station 3 can't correctly receive the access exploration of MS by inserting collision because the user that initiation simultaneously inserts at random is many; Perhaps the number of times of MS access exploration has surpassed the number of times of the maximum access explorations of base station 3 these MS of permission; Then MS assert the access procedure failure by current area.
Therefore, MS need insert candidate cell set, select an only cell base station to insert, suppose MS at position B place, insert candidate cell set and have only to insert a candidate cell 5 that then MS selects this base station 5, timing information and access slot resource according to base station 5, initiate random access procedure, MS selects an access slot in the base station 5 at random according to inserting selection algorithm at random, sends access exploration at selected access slot with certain power; MS in the base station 5 random access procedure with 3 random access procedure processing mode is identical in the base station; If MS receives the Indication message that base station 5 allows access, MS sets up data communication with base station 5 on the dedicated channel of base station 5 distribution, finish call function; If MS fails at the access procedure of all access candidate cells that insert candidate cell set, then this call establishment failure of MS, this conversation is rejected.Needing only the access candidate cell set has an access candidate cell can allow MS to insert, and MS just carries out data interaction with this base station on the dedicated channel that this cell base station distributes, finish functions such as conversation.
Claims (7)
1, improve the method that travelling carriage inserts success rate in a kind of mobile communication system, comprising:
(1) location registers and registration are carried out in sub-district of mobile station in selecting, and this sub-district is as the resident current area of travelling carriage;
(2) the neighbor cell base station signal quality of moving table measuring current area selects signal quality to meet the neighbor cell of setting situation, reads the system broadcast message of this sub-district;
(3) according to the relevant information in the system broadcast message, select satisfactory sub-district as inserting candidate cell, travelling carriage is safeguarded the relevant configuration information that inserts candidate cell;
(4) when travelling carriage has communication requirement, travelling carriage sends the request of access to the current area base station, initiates random access procedure, if the random access procedure success, then travelling carriage carries out information interaction on current area, otherwise, execution in step (5);
(5) travelling carriage sends the request of access to inserting the candidate cell base station, initiates random access procedure, if the random access procedure success, then travelling carriage carries out information interaction on this access candidate cell, otherwise epicycle inserts the request failure.
2, improve the method that travelling carriage inserts success rate in the mobile communication system according to claim 1, it is characterized in that the relevant information in the described system broadcast message of step (3) comprises: the relevant information of registration information, access service grade and base station physical layer.
3, improve the method that travelling carriage inserts success rate in the mobile communication system according to claim 1, it is characterized in that described step (5) also comprises the processing procedure when it is a plurality of inserting candidate cell, comprising:
(31) travelling carriage sends the request of access to inserting the candidate cell base station, if the random access procedure success, then travelling carriage carries out information interaction on this access candidate cell, otherwise, carry out (32);
(32) judge whether travelling carriage exists in epicycle and insert in the request process not through initiating the access candidate cell of random access procedure, if any carrying out (31), otherwise epicycle inserts the request failure.
4, improve the method that travelling carriage inserts success rate in the mobile communication system according to claim 1, it is characterized in that described method also comprises the renewal process that inserts candidate cell, inserting candidate cell is to upgrade according to the measurement result of a new neighbor cell base station signal quality.
5, improve the method that travelling carriage inserts success rate in the mobile communication system according to claim 1, it is characterized in that described measurement cell base station signal quality is signal strength parameter and a signal to noise ratio parameter of measuring the cell base station signal.
6, improve the method that travelling carriage inserts success rate in the mobile communication system according to claim 1, it is characterized in that the relevant configuration information that described travelling carriage maintenance inserts candidate cell comprises: the synchronizing information of cell base station, timing information and access-in resource information.
7, improve the method that travelling carriage inserts success rate in the mobile communication system according to claim 1, it is characterized in that described Mobile Origination random access procedure comprises:
(71) travelling carriage is selected an access slot at random according to inserting algorithm at random in the access slot resource that base station cell can be used;
(72) according to the transmitting power of base station cell configuration,, send the request of access to this cell base station at selected access slot place;
(73) the access request-reply of wait cell base station; If travelling carriage receives replying of cell base station, allow to insert, then random access procedure success, otherwise, execution in step (74);
(74) judge whether cell base station allows travelling carriage to send new access request,, then carry out (75) if allow, otherwise, the failure of epicycle random access procedure;
(75) select an access slot again at random, send to cell base station and insert request, execution in step (73) at random.
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