CN102388653B - Method and device for selecting frequency point - Google Patents
Method and device for selecting frequency point Download PDFInfo
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- CN102388653B CN102388653B CN201180002176.5A CN201180002176A CN102388653B CN 102388653 B CN102388653 B CN 102388653B CN 201180002176 A CN201180002176 A CN 201180002176A CN 102388653 B CN102388653 B CN 102388653B
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- frequency range
- terminal
- base station
- routing update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
Abstract
The invention discloses a method and device for selecting frequency points, which are capable of shifting a terminal to an indoor superimposing frequency range so that the indoor superimposing frequency range can be better used. Furthermore, the data exchange rate between the terminal and a base station and signal quality can be improved. The method includes the steps of the base station sending a router updating request to the terminal, and receiving router updating response returned by the terminal, wherein the router updating response includes the covering zone mark of indoor superimposing frequency range of the terminal and pilot strength of the indoor superimposing frequency range; and instructing the terminal to be shifted to the indoor superimposing frequency range according to the covering zone mark of indoor superimposing frequency range, if the pilot strength passes the pilot threshold. The embodiments of the invention are used for shifting the terminal to the indoor superimposing frequency range.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of frequency point selecting method and device.
Background technology
In recent years, Communications Market increasingly competitive, increasing operator seeks to merge and enhances competitiveness.Because generally there is different frequency ranges in different operators, this has just produced the scene of multiband stack networking.Especially in city densely populated, that telephone traffic is very large, more need multiband stack networking that enough network capacitys are provided.Because most wireless data service all occurs in indoorly, therefore, indoor covering how to dispose multiband stack networking becomes the focus that operator more and more pays close attention to.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems: in indoor covering scene, when the resident frequency range in indoor and outdoor adopts with frequency system, when indoor and outdoor stack frequency range adopts alien frequencies to cover, because be subject to the impact of outdoor grand net Pilot Interference, most user or residently arrived outdoor frequency range, causes that terminal speed is low, signal difference thus, and indoor frequency can not effectively utilize.
Summary of the invention
The method and apparatus that embodiments of the invention provide a kind of frequency to select, can be switched to terminal indoor stack frequency range, indoor stack frequency range can be used effectively, and further, can promote exchanges data speed and signal quality between terminal and base station.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, the embodiment of the present invention provides a kind of frequency point selecting method, comprising:
Send routing update request message to terminal;
Receive the routing update response that described terminal is returned, described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
If described pilot frequency intensity exceedes pilot threshold, according to the mark of the described indoor stack frequency range area of coverage, indicate described terminal to switch to corresponding indoor stack frequency range.
On the one hand, the embodiment of the present invention provides a kind of frequency point selecting method, comprising:
Terminal receives the routing update request message sending from base station;
Described terminal sends routing update response message to described base station, and described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
Described terminal is switched to corresponding indoor stack frequency range according to the instruction of described base station.
On the one hand, the embodiment of the present invention provides a kind of base station, comprising:
Transmitter, for sending routing update request message to terminal;
Receiver, the routing update of returning for receiving terminal response, described routing update respond packet is containing the mark of the terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
First processor, if exceed pilot threshold for described pilot frequency intensity, according to the mark of the described indoor stack frequency range area of coverage, indicates described terminal to switch to corresponding indoor stack frequency range and carries out business.
On the other hand, the embodiment of the present invention provides a kind of terminal, comprising:
Terminal receiver, for receiving the routing update request message sending from base station;
Terminal transmitter, for sending routing update response message to described base station, described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
Switch unit, for being switched to corresponding indoor stack frequency range according to the instruction of described base station.
The method and apparatus that the frequency that the embodiment of the present invention provides is selected, by routing update request message is sent to terminal, make terminal obtain self mark of the indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range, and send routing update and respond to base station, thus, the pilot frequency intensity of the indoor stack frequency range that base station can record according to the residing position of terminal and terminal, switches to indoor stack frequency range by terminal.Can make indoor stack frequency range be used effectively by this scheme, and further, can promote exchanges data speed and signal quality between terminal and base station.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the frequency point selecting method of base station side in the embodiment of the present invention 1;
Fig. 2 is the flow chart of the frequency point selecting method of end side in the embodiment of the present invention 1;
Fig. 3 is the frequency point selecting method flow chart in the embodiment of the present invention 2;
Fig. 4 is the block diagram of the frequency choice device of base station one side in the embodiment of the present invention 3;
Fig. 5 is the block diagram of the another kind of frequency choice device on Fig. 4 basis;
Fig. 6 is the block diagram of the another kind of frequency choice device on Fig. 5 basis;
Fig. 7 is the block diagram of the first processor in the embodiment of the present invention 3;
Fig. 8 is the block diagram of the frequency choice device of terminal one side in the embodiment of the present invention 3;
Fig. 9 is the block diagram of the another kind of frequency choice device on Fig. 8 basis.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
The embodiment of the present invention provides a kind of frequency point selecting method, the method that the method is base station side, and as shown in Figure 1, the method comprises:
101, send routing update request message RUR to terminal.
102, receive the routing update response that described terminal is returned, described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
After described routing update response receives described routing update request message RUR by described terminal, generate, and described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
If 103 described pilot frequency intensities exceed pilot threshold, according to the mark of the described indoor stack frequency range area of coverage, indicate described terminal to switch to corresponding indoor stack frequency range.
The embodiment of the present invention also provides a kind of frequency point selecting method, the method that the method is end side, and as shown in Figure 2, the method comprises:
201, terminal receives the routing update request message RUR sending from base station.
202, described terminal sends routing update response to described base station, and described routing update response comprises the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
Described routing update response is to generate after the described routing update request message RUR receiving from the transmission of described base station, and described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
If 203 described pilot frequency intensities exceed pilot threshold, described terminal is switched to corresponding indoor stack frequency range according to the instruction of described base station.
The frequency point selecting method that the embodiment of the present invention provides, by routing update request message RUR is sent to terminal, make terminal obtain self mark of the indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range, and send routing update and respond to base station, thus, the pilot frequency intensity of the indoor stack frequency range that base station can record according to the mark of the terminal indoor stack frequency range area of coverage of living in and terminal, switches to corresponding indoor stack frequency range by terminal.Can make indoor stack frequency range be used effectively by this scheme, and further, can promote exchanges data speed and signal quality between terminal and base station.
Embodiment 2:
The embodiment of the present invention provides a kind of frequency point selecting method, as shown in Figure 3, said method comprising the steps of:
301, terminal sends connection request to base station.
After described starting up of terminal, in resident frequency range, described terminal is linked into channel from the F1 frequency of resident frequency range, sends connection request to described base station.
302, base station sends Traffic Channel Assignment message TCA to terminal, indicates described terminal to be switched to outdoor stack frequency range.
For example, described base station obtains a F2 frequency in outdoor stack frequency range, and sets up Traffic Channel.Described base station sends Traffic Channel Assignment message TCA from F1 frequency, to indicate described terminal to be switched on the F2 frequency of outdoor stack frequency range.
303, terminal is linked into described outdoor stack frequency range.
Described terminal is receiving after the Traffic Channel Assignment message TCA of described base station transmission, and the Traffic Channel of setting up by described base station is linked into the enterprising industry business of outdoor stack frequency range F2 frequency.
304, terminal sends Traffic Channel and completes message TCC to base station.
Described terminal sends Traffic Channel to described base station and completes message TCC after being linked into the enterprising industry business of outdoor stack frequency range F2 frequency, and described base station completes message TCC by this Traffic Channel, confirms that described terminal switches to described outdoor stack frequency range.
305, base station judges to detect and is preset in switch parameter in base station whether in opening, if described switch parameter, in opening, performs step 306; If described switch parameter, in closed condition, does not send routing update request message RUR to described terminal, so that terminal remains on original frequency range.
Base station can be after execution step 301 to 304, and the judgement detection of switch parameter can be carried out to the terminal in outdoor stack frequency range in base station; There is no step 301 to 304 in the situation that, the judgement that switch parameter also can be directly be carried out to the terminal in resident frequency range in base station detects.Describe respectively below.
On the one hand, described terminal is in resident frequency range.Described base station is first detected and judges the switch parameter being preset in base station, if described switch parameter is in opening, send described routing update request message RUR to described terminal, if described switch parameter is in closed condition, do not send described routing update request message RUR to described terminal, so that described terminal remains on resident frequency range.
On the other hand, described terminal is in outdoor stack frequency range.Described base station is first detected and judges the switch parameter being preset in base station, if described switch parameter is in opening, send described routing update request message RUR to described terminal, if described switch parameter is in closed condition, do not send described routing update request message RUR to described terminal, so that described terminal remains on outdoor stack frequency range.
306, base station sends routing update request message RUR to terminal.
307, terminal generates routing update response, and this routing update response comprises the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
Described terminal, receiving after the routing update request message RUR of described base station transmission, is obtained self mark of the indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range, and generates routing update response.
308, terminal sends routing update response to base station.
Respond by routing update, terminal sends the pilot frequency intensity of the mark of the indoor stack frequency range area of coverage and indoor stack frequency range to base station.
309, judgement is detected to the pilot frequency intensity in described routing update response in base station, if described pilot frequency intensity is no more than described pilot threshold, described base station does not indicate described terminal to switch; If described pilot frequency intensity exceedes described pilot threshold, perform step 310.
310, base station adopts hash HASH algorithm in corresponding indoor stack frequency range, from corresponding indoor stack frequency range, selects a frequency.
Described base station is according to the mark of the terminal indoor stack frequency range area of coverage of living in, find corresponding indoor stack frequency range, and adopting hash HASH algorithm in corresponding indoor stack frequency range, the frequency that HASH goes out in a frequency and described resident frequency range forms neighboring BS relationship, turns to afterwards step 311.
Certainly, in actual applications, base station also can adopt other algorithm picks frequencies.
311, base station and terminal connect, and the frequency that terminal is switched to described selection carries out business.
The frequency point selecting method that the embodiment of the present invention provides, by routing update request message RUR is sent to terminal, make terminal obtain self mark of the indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range, and send routing update and respond to base station, thus, the pilot frequency intensity of the indoor stack frequency range that base station can record according to the mark of the terminal indoor stack frequency range area of coverage of living in and terminal, switches to corresponding indoor stack frequency range by terminal.Further, in the time that indoor stack frequency range is disposed multiple frequency, base station system can adopt HASH algorithm, and in multiple frequencies, HASH goes out a frequency rapidly, carries out business to connect.Can make indoor stack frequency range be used effectively by this scheme, and further, can promote exchanges data speed and signal quality between terminal and base station.
Embodiment 3:
The embodiment of the present invention provides a kind of frequency choice device, and on the one hand, in base station, as shown in Figure 4, described device comprises transmitter 41, receiver 42, first processor 43.
Transmitter 41 is for sending routing update request message RUR to terminal.
The routing update response that receiver 42 returns for receiving terminal; After described routing update response receives described routing update request message RUR by described terminal, generate, and described routing update respond packet is containing the mark of the terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
First processor 43, in the time that described pilot frequency intensity exceedes pilot threshold, according to the mark of the described indoor stack frequency range area of coverage, is indicated described terminal to switch to corresponding indoor stack frequency range and is carried out business.
Further, as shown in Figure 5, described receiver 42 also, for sending before described routing update request message to described terminal, receives the connection request of described terminal; Described transmitter 41 is also for sending Traffic Channel Assignment message to described terminal, to indicate described terminal to carry out business to outdoor stack frequency range; Described device also comprises the second processor 44, completes message and confirms that described terminal switches to described outdoor stack frequency range and carries out business for the Traffic Channel that receives described terminal transmission.
Further, as shown in Figure 6, described device also comprises switch parameter detecting unit 45, for sending to described terminal before described routing update request message RUR, whether detects the switch parameter being preset in described base station in opening.If described switch parameter, in opening, sends described routing update request message RUR to described terminal, otherwise, do not send described routing update request message RUR to described terminal, so that described terminal remains on original frequency range.
In addition, as shown in Figure 7, first processor 43 also comprises frequency selection module 431, user's handover module 432.
Frequency selects module 431 for taking hash HASH algorithm as foundation, selects a frequency in corresponding indoor stack frequency range.
User's handover module 432 is used to indicate described terminal and switches to the frequency that described frequency selects module 431 to select.
On the other hand, the device in terminal, as shown in Figure 8, comprises terminal receiver 81, terminal transmitter 82, switch unit 83.
Terminal receiver 81 is for receiving the routing update request message RUR sending from base station.
Terminal transmitter 82 is for sending routing update response message to described base station, and described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range.
Switch unit 83 is for being switched to corresponding indoor stack frequency range according to the instruction of described base station.
Further, as shown in Figure 9, the device in described terminal also comprises connection message transmitting element 84, assignment message receiving element 85, completes message sending unit 86.
Connection message transmitting element 84, for before receiving the described routing update request message RUR sending from described base station, sends connection message to described base station.
The Traffic Channel Assignment message TCA that assignment message receiving element 85 sends for receiving described base station, then carries out business to described outdoor stack frequency range.
Complete message sending unit 86 for being successfully linked into after described outdoor stack frequency range, send Traffic Channel to described base station and complete message TCC, to notify this terminal of described base station to be successfully linked into described outdoor stack frequency range.
The frequency choice device that the embodiment of the present invention provides, no matter end is in resident frequency range or outdoor stack frequency range, base station can both be by sending to terminal by routing update request message RUR, make terminal obtain self mark of the indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range, and generate routing update response and send it back base station, thereby terminal is switched to corresponding indoor stack frequency range.Simultaneously, in the time that indoor stack frequency range is disposed multiple frequency, base station adopts HASH algorithm, in multiple frequencies, HASH goes out a frequency rapidly, carry out business to connect, indoor stack frequency range can be used effectively, and further, can promote exchanges data speed and signal quality between terminal and base station.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (12)
1. a frequency point selecting method, is characterized in that, comprising:
When terminal is during in resident frequency range or outdoor stack frequency range, send routing update request message to described terminal;
Receive the routing update response that described terminal is returned, described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
If described pilot frequency intensity exceedes pilot threshold, according to the mark of the described indoor stack frequency range area of coverage, indicate described terminal to switch to corresponding indoor stack frequency range.
2. method according to claim 1, is characterized in that, sending before described routing update request message to described terminal, described method also comprises:
Receive the connection request of described terminal;
Send Traffic Channel Assignment message to described terminal, to indicate described terminal to carry out business to outdoor stack frequency range;
The Traffic Channel that receives described terminal transmission completes message and confirms that described terminal switches to described outdoor stack frequency range.
3. method according to claim 1 and 2, is characterized in that, sending before described routing update request message to described terminal, described method also comprises:
Whether detection is preset in the switch parameter of base station in opening; If described switch parameter, in opening, sends described routing update request message to described terminal, otherwise does not send described routing update request message to described terminal, so that described terminal remains on original frequency range.
4. method according to claim 1, is characterized in that, the described terminal of described instruction switches to corresponding indoor stack frequency range and comprises:
Adopt hash HASH algorithm, select a frequency in corresponding indoor stack frequency range;
Described terminal is switched to the frequency of described selection.
5. a frequency point selecting method, is characterized in that, comprising:
Terminal receives the routing update request message sending from base station, and wherein, described terminal is in resident frequency range or outdoor stack frequency range;
Described terminal sends routing update response message to described base station, and described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
Described terminal is switched to corresponding indoor stack frequency range according to the instruction of described base station.
6. method according to claim 5, is characterized in that, before receiving the described routing update request message sending from described base station, described method also comprises:
Send connection message to described base station;
Receive the Traffic Channel Assignment message that described base station sends, be then switched to corresponding outdoor stack frequency range;
Successfully be linked into after described outdoor stack frequency range, send Traffic Channel to described base station and complete message.
7. a base station, is characterized in that, comprising:
Transmitter, for when terminal is during in resident frequency range or outdoor stack frequency range, sends routing update request message to described terminal;
Receiver, the routing update of returning for receiving terminal response, described routing update respond packet is containing the mark of the terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
First processor, if exceed pilot threshold for described pilot frequency intensity, according to the mark of the described indoor stack frequency range area of coverage, indicates described terminal to switch to corresponding indoor stack frequency range and carries out business.
8. base station according to claim 7, is characterized in that, described receiver also, for sending before described routing update request message to described terminal, receives the connection request of described terminal;
Described transmitter is also for sending Traffic Channel Assignment message to described terminal, to indicate described terminal to carry out business to outdoor stack frequency range;
Described base station also comprises:
The second processor, completes message and confirms that described terminal switches to described outdoor stack frequency range and carries out business for the Traffic Channel that receives described terminal transmission.
9. according to the base station described in claim 7 or 8, it is characterized in that, also comprise:
Whether the 3rd processor, for sending to described terminal before described routing update request message, detect the switch parameter that is preset in described base station in opening; If described switch parameter, in opening, sends described routing update request message to described terminal, otherwise does not send described routing update request message to described terminal, so that described terminal remains on original frequency range.
10. base station according to claim 7, is characterized in that, described first processor also comprises:
Frequency is selected module, for taking hash HASH algorithm as foundation, selects a frequency in corresponding indoor stack frequency range;
User's handover module, is used to indicate described terminal and switches to the frequency that described frequency selects module to select.
11. 1 kinds of terminals, is characterized in that, comprising:
Terminal receiver, for receiving the routing update request message sending from base station, wherein, described terminal is in resident frequency range or outdoor stack frequency range;
Terminal transmitter, for sending routing update response message to described base station, described routing update respond packet is containing the mark of the described terminal indoor stack frequency range area of coverage of living in and the pilot frequency intensity of indoor stack frequency range;
Switch unit, for being switched to corresponding indoor stack frequency range according to the instruction of described base station.
12. terminals according to claim 11, is characterized in that, also comprise:
Connection message transmitting element, for before receiving the described routing update request message sending from described base station, sends connection message to described base station;
Assignment message receiving element, the Traffic Channel Assignment message sending for receiving described base station, is then switched to outdoor stack frequency range and carries out business;
Complete message sending unit, for being successfully linked into after described outdoor stack frequency range, send Traffic Channel to described base station and complete message.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2011/079265 WO2012119435A1 (en) | 2011-09-01 | 2011-09-01 | Frequency point selection method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102388653A CN102388653A (en) | 2012-03-21 |
| CN102388653B true CN102388653B (en) | 2014-10-08 |
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| CN201180002176.5A Active CN102388653B (en) | 2011-09-01 | 2011-09-01 | Method and device for selecting frequency point |
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| CN (1) | CN102388653B (en) |
| WO (1) | WO2012119435A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103619054B (en) * | 2013-11-20 | 2017-04-19 | 小米科技有限责任公司 | Method and device for selecting network frequency band and router |
| CN113727270A (en) * | 2020-05-22 | 2021-11-30 | 华为技术有限公司 | Uplink transmission method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101137215A (en) * | 2007-01-16 | 2008-03-05 | 中兴通讯股份有限公司 | Method for supporting mobile terminal to move between base stations with diversity of protocol versions |
| KR20090108377A (en) * | 2008-04-11 | 2009-10-15 | 에스케이 텔레콤주식회사 | METHOD THAT TRIGGER ALGORITHM FOR MINIMIZING DELAY OF HARD HAND OFF BY MEANS OF PILOT BEACON IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME |
| US7940776B2 (en) * | 2007-06-13 | 2011-05-10 | Cisco Technology, Inc. | Fast re-routing in distance vector routing protocol networks |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8897779B2 (en) * | 2009-08-05 | 2014-11-25 | Qualcomm Incorporated | Message-based exchange of access point pilot signature indicators |
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- 2011-09-01 WO PCT/CN2011/079265 patent/WO2012119435A1/en active Application Filing
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101137215A (en) * | 2007-01-16 | 2008-03-05 | 中兴通讯股份有限公司 | Method for supporting mobile terminal to move between base stations with diversity of protocol versions |
| US7940776B2 (en) * | 2007-06-13 | 2011-05-10 | Cisco Technology, Inc. | Fast re-routing in distance vector routing protocol networks |
| KR20090108377A (en) * | 2008-04-11 | 2009-10-15 | 에스케이 텔레콤주식회사 | METHOD THAT TRIGGER ALGORITHM FOR MINIMIZING DELAY OF HARD HAND OFF BY MEANS OF PILOT BEACON IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME |
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| WO2012119435A1 (en) | 2012-09-13 |
| CN102388653A (en) | 2012-03-21 |
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