CN101166360A - Base station selection method and communication system thereof - Google Patents
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Abstract
A base station selection method is used for a mobile station, and the mobile station sets a preset distance corresponding to a reference base station. The base station selection method comprises the steps of firstly, selecting a first base station as a servo base station. Then, a first C2 parameter corresponding to the mobile station is obtained from the second base station, and when the distance between the second base station and the reference base station is less than the predetermined distance, a second C2 parameter is obtained as the basis for the mobile station to select the serving base station, wherein the second C2 parameter is equal to the first C2 parameter plus a threshold value.
Description
Technical field
The invention relates to a kind of base station selecting method and communication system thereof, and particularly relevant for serving base station system of selection of a kind of expansion local zone and communication system thereof.
Background technology
At a communication system, for example be in the cellular wireless system, the geographic area of metropolitan area can be divided into a plurality of base station cells (Cell) usually.Several base stations be connected to move serve switching center (Mobile service Switch Center, MSC), move serve switching center be connected to again PSTN (Public Switched Telephone Network, PSTN).Hand-held or car-mounted device (travelling carriage) communicates with near base station and Reference BTS user in the cellular wireless system (mobile subscriber) with one, and wherein, (Mobile Station, MS) base station of carrying out communication is referred to as servo base station with travelling carriage.
Yet, be used to select suitable base station need use the C1 parameter and the C2 parameter is judged as the mobile station in selecting base station (cellselection) of servo base station, C1 parameter and C2 parameter are according to global system for mobile communications (Global System for Mobile Communications, GSM) standard (standard) is ordered, the C1 parameter is path loss threshold (Path loss criterion), and the C2 parameter is that threshold (Cell reselection criterion) is reselected in the sub-district.Servo base station is for travelling carriage, have positive C1 parameter value and be considered to best servo base station with the highest C2 parameter value, therefore often when travelling carriage detects higher C2 parameter value, just beginning to change another base station with higher C2 parameter value is servo base station.According to the regulation of ETSI 05.08, the C1 parameter is defined as follows:
C1=(A-Max (B, 0)); Wherein
A＝RLA_C-RXLEV_ACCESS_MIN；
RLA_C is the average power of the carrier wave of signal;
RXLEV_ACCESS_MIN is the minimum signal strength that a travelling carriage can connect communication system;
B＝MS_TXPWR_MAX_CCH-P；
MS_TXPWR_MAX_CCH is the maximum of power control not also on the Broadcast Control Channel;
P is the peak power output of this travelling carriage.
If the C1 parameter value of certain base station, represents that it is servo base station that this base station is fit to mobile station login greater than zero, and the base station of C1 parameter value maximum will be chosen as the servo base station of mobile station login.If travelling carriage is in mobile status (in the process that moves, the C1 parameter of detected servo base station will change), or selected servo base station refusal then must utilize the C2 parameter to judge whether selected servo base station is suitable when accepting other reason such as communication again.The C2 parameter is defined as follows:
C2＝C1+CELL_RESELECTION_OFFSET-TEMPORARYOFFSET*H(PENALTY_TIME-T)；
When PENALTY_TIME is not equal to 11111
Wherein, for other base stations of non-servo base station,
H (x)=0 is when x＜0;
H (x)=1 is when x 〉=0;
For just in the serving base station sub-district
H(x)＝0。
Local zone (Homezone) service mainly is to allow the user register to Virtual network operator in advance, rate or service preferably are provided in restricted portion, the mode of setting is to conclude a starting point earlier, this starting point is generally the Reference BTS of a sub-district, the user also registers a preset distance to Virtual network operator, is that the center of circle, preset distance are the local zone that a border circular areas of radius is user that Virtual network operator offers with the Reference BTS.When travelling carriage was learnt the position coordinates at servo base station place by the broadcasting of servo base station, if the position coordinates of this servo base station is positioned at the local zone, then the user can enjoy more preferential charging rate or various service.Otherwise not in the local zone, then the user uses normal charging rate as if this position coordinates, so arranges to attract the most of the time all to order this service the user of same sub-district activity, allows Virtual network operator that more order family is arranged.
In the above-mentioned conventional method, travelling carriage calculates distance with Reference BTS according to the position coordinates of servo base station as position coordinates itself, yet, thus, travelling carriage might be still in preset distance when the edge, local zone, but select with the territory, other regions in base station communication, the user can not make full use of the local zone size that Virtual network operator provides, even cause unnecessary dispute.Please refer to Fig. 1, Fig. 1 represents the schematic diagram of traditional local zone service.In Fig. 1, the local zone is for being the center of circle with the Reference BTS, and preset distance R is a border circular areas of radius.
The base station that travelling carriage is registered (being servo base station) may be first base station 101, second base station 102 or the 3rd base station 103.First base station 101 is R1 with the distance of Reference BTS 100, second base station 102 is R2 with the distance of Reference BTS 100, the 3rd base station 103 is R3 with the distance of Reference BTS 100, R1 and R3 are less than R, R2 is greater than R, when travelling carriage is connected in first base station 101 or the 3rd base station 103, the user can enjoy the local zone service that Virtual network operator provides, and enjoys lower charging rate; If mobile station in selecting second base station 102 is a servo base station, travelling carriage is not served in the local zone, can use higher rate, as shown in Figure 1, if original travelling carriage is positioned at the P point, first base station 101 is a servo base station, when travelling carriage moves to the Q point, the position is at the edge of first base station, 101 communication contexts, begin to measure the C1 parameter and the C2 parameter of second base station 102 and the 3rd base station 103, switch (handover) so that carry out the base station, this moment may be because second base station 102 be nearer from travelling carriage, comparison according to the C1 parameter and the C2 parameter of each base station, second base station 102 is more suitable for as new servo base station than the 3rd base station 103, therefore travelling carriage can select second base station 102 as new servo base station, yet travelling carriage during at the Q point and the distance of Reference BTS still in preset distance R, and the 3rd base station 103 still can provide appropriate signals intensity to use for the travelling carriage communication when the Q point, but according to existing communication protocol, though travelling carriage is positioned at the scope of local zone, the user but can't enjoy the local zone service that Virtual network operator provides, can't enjoy lower charging rate, cause user's rights and interests impaired.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of base station selecting method and communication system thereof exactly, utilizes the C2 parameter after the weighting to reselect servo base station, so that the service of rational local zone to be provided.
According to purpose of the present invention, a kind of base station selecting method is proposed, be used for travelling carriage, travelling carriage is set a preset distance corresponding to Reference BTS.Base station selecting method comprises that at first, selecting first base station is servo base station.Then, obtain the C2 parameter of second base station corresponding to travelling carriage, when the distance of judging second base station and Reference BTS during less than preset distance, obtain the foundation of the 2nd C2 parameter as the mobile station in selecting servo base station, the 2nd C2 parameter is that a C2 parameter adds a threshold value.
According to purpose of the present invention, a kind of communication system is also proposed, comprise Reference BTS, travelling carriage, first base station and second base station.The corresponding Reference BTS of travelling carriage is set a preset distance.First base station is the servo base station of travelling carriage.The distance of second base station and Reference BTS is less than preset distance, travelling carriage is obtained the C2 parameter of second base station corresponding to travelling carriage, it is servo base station that travelling carriage judges whether to select second base station according to the 2nd C2 parameter, and the 2nd C2 parameter is that a C2 parameter adds a threshold value.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:
Fig. 1 is the schematic diagram of expression traditional local zone service;
Fig. 2 A and 2B are the flow chart of expression according to the base station selecting method of the preferred embodiment of the present invention;
Fig. 3 is that expression is according to a C2 parameter of a plurality of base stations of the preferred embodiment of the present invention and the contrast figure of the 2nd C2 parameter.
The main element symbol description:
100: Reference BTS
101～105: the base station
Embodiment
The invention provides a kind of base station selecting method and communication system thereof, utilize the C2 parameter after the weighting to reselect servo base station, to enlarge local zone service (Homezone service), so that the user to be provided more rights and interests.
The local zone method of servicing is applied in the communication system, for example is the schematic diagram of local zone service among Fig. 1.Wherein, communication system comprises Reference BTS 100, travelling carriage and a plurality of base station, for example is first base station 101, second base station 102 and the 3rd base station 103.One of them is servo base station for a mobile station in selecting, is neighbor base station adjacent to other base stations of servo base station.The corresponding Reference BTS 100 of travelling carriage is set a preset distance R, and the zone of distance within preset distance R of travelling carriage and Reference BTS 100 is the local zone.The position coordinates of the servo base station broadcasting distance of calculating servo base station and Reference BTS for travelling carriage itself.When the distance of servo base station and Reference BTS less than preset distance R, servo base station provides a local zone to serve to travelling carriage.
Please refer to Fig. 2 A and 2B, Fig. 2 A and 2B are the flow charts according to the base station selecting method of the preferred embodiment of the present invention.As user during with travelling carriage and servo base station communication, may be because bad or other factors of communication situation, and execution in step 200, promptly travelling carriage must be reselected one of neighbor base station as servo base station.
In order to save power consumption, in step 202, travelling carriage judges according to a critical value t whether the position coordinates of the existing servo base station of just registering is positioned at a critical range of local zone, the lower limit of this critical range is the product R * t of preset distance and critical value, the higher limit of critical range be 2 with the difference of critical value and product (the 2-t) * R of preset distance.Critical value t for example is t=0.8, and then the critical range of local zone is between 0.8R～1.2R.
If the position coordinates of servo base station is positioned at the critical range of local zone, then in step 204, travelling carriage is obtained the position coordinates of a plurality of neighbor base stations from the neighbor base station tabulation of servo base station, that is to say that this information is provided by servo base station; Perhaps in another mode, can directly receive and be read by the broadcast message of neighbor base station.Then, in step 206, travelling carriage must judge whether to read the position coordinates of all neighbor base stations.If travelling carriage reads the position coordinates of all neighbor base stations, then in step 208, travelling carriage calculates a corresponding C1 parameter of each neighbor base station and a C2 parameter, and a C2 parameter herein is the C2 parameter in the conventional method.
Then, in step 210, travelling carriage calculates and finds out the weighting base station that is positioned at the local zone according to the coordinate position of neighbor base station, the distance of these weighting base stations and Reference BTS 100 is less than preset distance R, and travelling carriage adds in addition that with a C2 parameter of these weighting base station correspondences a threshold value becomes the 2nd C2 parameter.In step 212, the base station that has maximum C2 parameter value (a C2 parameter or the 2nd C2 parameter) in the mobile station in selecting neighbor base station is a servo base station, that is to say that travelling carriage is the 2nd C2 parameter for the C2 parameter of weighting base station in the neighbor base station, the C2 parameter of other base station is a C2 parameter.Please refer to Fig. 3, Fig. 3 is the contrast figure according to a C2 parameter and the 2nd C2 parameter of a plurality of base stations of the preferred embodiment of the present invention.As Fig. 1 and shown in Figure 3, when travelling carriage moves to the Q point, neighbor base station is base station 102,103,104 and 105, the C2 parameter that travelling carriage measures neighbor base station earlier is respectively b, c, d and e, coordinate position by neighbor base station calculates then, base station 103 and 104 is respectively in the local zone, therefore in addition base station 103 and 104 is set as the weighting base station, and a C2 parameter of correspondence added that in addition a threshold value f becomes the 2nd C2 parameter, then travelling carriage just decides the selection of follow-up servo base station with C2 parameter b, c+f, d and e+f the maximum.
In addition, in step 202, if the position coordinates of servo base station is not in the critical range of local zone, then in step 214, travelling carriage calculates corresponding a plurality of C1 parameters of all neighbor base stations and an a plurality of C2 parameter, and in step 216, the neighbor base station that selection has a maximum C2 parameter value is a servo base station.
In addition, in step 206, if travelling carriage can't read the position coordinates of a certain neighbor base station, at this moment, travelling carriage can't calculate corresponding a plurality of C1 parameters of all neighbor base stations and an a plurality of C2 parameter.So in step 218, the travelling carriage search is previous during with Reference BTS 100 communications, Reference BTS 100 transmits and is recorded in the position coordinates of the interior a plurality of neighbor base stations of the high-speed cache (cache) of travelling carriage to read the position coordinates of neighbor base station.
Yet, if in step 218, travelling carriage still fails to read the position coordinates of neighbor base station, then in step 220, travelling carriage reads Broadcast Control Channel (the BroadcastControl Channel of neighbor base station, BCCH), what this must know be, the stipulations of existing global system for mobile communications standard have only mentioned how travelling carriage receives the broadcast message of servo base station, and do not mention the mechanism that travelling carriage receives the broadcast message of neighbor base station, present embodiment reads absolute wireless frequency channel number (the Absolute Radio FrequencyChannel Number of neighbor base station tabulation to learn neighbor base station from servo base station, ARFCN), read the Broadcast Control Channel of neighbor base station in and the from then on absolute wireless frequency channel number.
(System Information, SI), and by system information SI, travelling carriage promptly can read the information that neighbor base station is broadcasted can to carry system information in the Broadcast Control Channel of neighbor base station.So, in step 222, travelling carriage judges whether neighbor base station supports Cell Broadcast Short Message CBCH service (ShortMessage Service Cell Broadcast, SMSCB), if neighbor base station is supported Cell Broadcast Short Message CBCH service SMSCB, then in step 224, travelling carriage will decode the position coordinates of neighbor base station from the system information SI of BCCH channel of broadcast control, immediately, the travelling carriage execution in step 206.
If neighbor base station is not supported Cell Broadcast Short Message CBCH service SMSCB, then in step 226, travelling carriage knows that promptly neighbor base station do not support local zone service (Homezone service), travelling carriage does not promptly reattempt the position coordinates that reads neighbor base station, and after the step 206 execution in step 208.
In the above embodiments, in step 202, present embodiment defines the critical range of local zone, if on behalf of travelling carriage, travelling carriage not within this critical range, then from the border of local zone (boundary) segment distance is arranged, thus, then can adopt the existing servo base station flow process of reselecting, be step 214～216 among Fig. 2, and travelling carriage do not need the to decode BCCH channel of broadcast control of neighbor base station, power consumption can be reduced.And if travelling carriage is positioned within the critical range, then represent the border of travelling carriage near the local zone, promptly be positioned at so-called fuzzy area, then enter step 204 by step 202.
In addition, in the stipulations of existing global system for mobile communications standard, travelling carriage must read once the BCCH channel of broadcast control of a plurality of neighbor base stations every 5 minutes, yet, because travelling carriage displacement within certain hour is not too large, so the position coordinates of a plurality of neighbor base stations can't change often, so, in actual applications, the position coordinates of a plurality of neighbor base stations that travelling carriage will read is stored in the high-speed cache of travelling carriage, thus, promptly can read the position coordinates of a plurality of neighbor base stations in step 218 from high-speed cache, and the BCCH channel of broadcast control of a plurality of neighbor base stations that do not need to go again to decode can be saved time.
Disclosed base station selecting method of the above embodiment of the present invention and communication system thereof utilize the C2 parameter after the weighting to reselect servo base station, to enlarge local zone service (Homezoneservice), so that the user to be provided more rights and interests.
In sum, though the present invention has used a preferred embodiment openly as above, yet it is not to be used for limiting the present invention.The technical staff who has common knowledge in the technical field of the invention without departing from the spirit and scope of the invention, can do various changes and retouching.Therefore, protection scope of the present invention should be as the criterion with the scope that appended claims was defined.
Claims (18)
1. a base station selecting method is used for a travelling carriage, and described travelling carriage is set a preset distance corresponding to a Reference BTS, and this base station selecting method comprises:
Selecting one first base station is a servo base station; And
Obtain the one one C2 parameter of one second base station corresponding to described travelling carriage, when the distance of judging described second base station and this Reference BTS during less than this preset distance, obtain the foundation of one the 2nd C2 parameter as described this servo base station of mobile station in selecting, described the 2nd C2 parameter equals a described C2 parameter and adds a threshold value.
2. base station selecting method according to claim 1, it is characterized in that, described first base station broadcast, one primary importance coordinate is in order to calculate the distance of described first base station and described Reference BTS, when the distance of described first base station and described Reference BTS less than described preset distance, described first base station provides local zone service to described travelling carriage.
3. base station selecting method according to claim 1 is characterized in that, described second base station broadcast, one second place coordinate is in order to calculate the distance of described second base station and described Reference BTS.
4. base station selecting method according to claim 3, it is characterized in that, calculate the step of the distance of described second base station and described Reference BTS and also judge according to a critical value whether described second base station is positioned at a critical range of described preset distance, wherein, the lower limit of described critical range is the product of described preset distance and this critical value, and the higher limit of described critical range is the poor of the twice of described preset distance and described critical range lower limit.
5. base station selecting method according to claim 1 is characterized in that, described second base station is the neighbor base station of described first base station, and the position coordinates of the described neighbor base station of described first base station broadcast is given described travelling carriage.
6. base station selecting method according to claim 5, it is characterized in that, when described travelling carriage can't read the position coordinates of described neighbor base station, described travelling carriage reading and recording was stored in the position coordinates of neighbor base station described in the memory in described travelling carriage.
7. base station selecting method according to claim 6 is characterized in that it also comprises:
When described travelling carriage did not read the position coordinates that is recorded in the described neighbor base station that is stored in memory in the described travelling carriage, described travelling carriage read a Broadcast Control Channel of described neighbor base station;
Described travelling carriage judges whether described neighbor base station supports a Short Message Service; And
When described neighbor base station is supported described Short Message Service, described travelling carriage decodes the position coordinates of described neighbor base station from a system information of described Broadcast Control Channel.
8. base station selecting method according to claim 7 is characterized in that, when described neighbor base station was not supported described Short Message Service, described neighbor base station was not supported local zone service.
9. base station selecting method according to claim 1 is characterized in that, described method also comprises:
Obtain the one three C2 parameter of one the 3rd base station corresponding to described travelling carriage, when the distance of described the 3rd base station and described Reference BTS during greater than described preset distance, selecting the base station of described the 3rd C2 parameter and described the 2nd C2 parameter the greater is described servo base station.
10. communication system comprises:
One Reference BTS;
One travelling carriage, corresponding described Reference BTS is set a preset distance;
One first base station is a servo base station of described travelling carriage; And
One second base station, with the distance of described Reference BTS less than described preset distance, described travelling carriage is obtained the one one C2 parameter of described second base station corresponding to described travelling carriage, it is described servo base station that described travelling carriage judges whether to select described second base station according to one the 2nd C2 parameter, and described the 2nd C2 parameter equals a described C2 parameter and adds a threshold value.
11. communication system according to claim 10, it is characterized in that, described first base station broadcast, one primary importance coordinate is in order to calculate the distance of described first base station and described Reference BTS, when the distance of described first base station and described Reference BTS less than described preset distance, described first base station provides the service of described travelling carriage one local zone.
12. communication system according to claim 10 is characterized in that, this second base station broadcast, one second place coordinate is in order to calculate the distance of this second base station and this Reference BTS.
13. communication system according to claim 12, it is characterized in that, calculate the step of the distance of described second base station and described Reference BTS and also judge according to a critical value whether this second base station is positioned at a critical range of described preset distance, wherein, the lower limit of this critical range is the product of this preset distance and this critical value, and the higher limit of described critical range is the poor of the twice of described preset distance and described critical range lower limit.
14. communication system according to claim 10 is characterized in that, described second base station is the neighbor base station of described first base station, and the position coordinates of described first this neighbor base station of base station broadcast is given described travelling carriage.
15. communication system according to claim 14, it is characterized in that, when described travelling carriage can't read the position coordinates of this neighbor base station, described travelling carriage judged whether the position coordinates of the described neighbor base station of energy reading and recording in the high-speed cache of described travelling carriage.
16. communication system according to claim 15, it is characterized in that, when described travelling carriage does not read the position coordinates of this neighbor base station of the high-speed cache that is recorded in this travelling carriage, described travelling carriage reads a Broadcast Control Channel of this neighbor base station, and described travelling carriage judges whether described neighbor base station supports a Short Message Service, when described neighbor base station was supported described Short Message Service, described travelling carriage decoded the position coordinates of described neighbor base station from a system information of described Broadcast Control Channel.
17. communication system according to claim 16 is characterized in that, when described neighbor base station was not supported this Short Message Service, described neighbor base station was not supported local zone service.
18. communication system according to claim 10 is characterized in that, described communication system also comprises:
One the 3rd base station, has one the 3rd C2 parameter corresponding to described travelling carriage, when described the 3rd base station and described Reference BTS distance greater than described preset distance the time, the base station of described the 3rd C2 parameter of described mobile station in selecting and described the 2nd C2 parameter the greater is described servo base station.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149065A (en) * | 2011-04-08 | 2011-08-10 | 中兴通讯股份有限公司 | System and method for providing preferential service to mobile terminal |
| CN102457826A (en) * | 2010-10-22 | 2012-05-16 | 中国移动通信集团安徽有限公司 | Method and device for determining preferential area for communication users |
| CN110582992A (en) * | 2017-03-02 | 2019-12-17 | 环球星链公司 | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications installations |
| US11595114B2 (en) | 2017-04-26 | 2023-02-28 | Lynk Global, Inc. | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications devices that use terrestrial base station communications |
| US11863250B2 (en) | 2021-01-06 | 2024-01-02 | Lynk Global, Inc. | Satellite communication system transmitting navigation signals using a wide beam and data signals using a directive beam |
| US12389213B1 (en) | 2021-03-08 | 2025-08-12 | Lynk Global, Inc. | Routing emergency cellular communications and associated detected location information using orbital base stations |
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- 2006-10-18 CN CNA2006101528119A patent/CN101166360A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457826A (en) * | 2010-10-22 | 2012-05-16 | 中国移动通信集团安徽有限公司 | Method and device for determining preferential area for communication users |
| CN102457826B (en) * | 2010-10-22 | 2015-05-20 | 中国移动通信集团安徽有限公司 | Method and device for determining preferential section of communication user |
| CN102149065A (en) * | 2011-04-08 | 2011-08-10 | 中兴通讯股份有限公司 | System and method for providing preferential service to mobile terminal |
| CN110582992A (en) * | 2017-03-02 | 2019-12-17 | 环球星链公司 | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications installations |
| US12250064B2 (en) | 2017-03-02 | 2025-03-11 | Lynk Global, Inc. | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications devices that use terrestrial base station communications |
| US11595114B2 (en) | 2017-04-26 | 2023-02-28 | Lynk Global, Inc. | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications devices that use terrestrial base station communications |
| US11876601B2 (en) | 2017-04-26 | 2024-01-16 | Lynk Global, Inc. | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications devices that use terrestrial base station communications |
| US12244401B2 (en) | 2017-04-26 | 2025-03-04 | Lynk Global, Inc. | Method and apparatus for handling communications between spacecraft operating in an orbital environment and terrestrial telecommunications devices that use terrestrial base station communications |
| US11863250B2 (en) | 2021-01-06 | 2024-01-02 | Lynk Global, Inc. | Satellite communication system transmitting navigation signals using a wide beam and data signals using a directive beam |
| US12476672B2 (en) | 2021-01-06 | 2025-11-18 | Lynk Global, Inc. | Satellite communication system transmitting navigation signals using a wide beam and data signals using a directive beam |
| US12389213B1 (en) | 2021-03-08 | 2025-08-12 | Lynk Global, Inc. | Routing emergency cellular communications and associated detected location information using orbital base stations |
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