CN102769919B - Communication channel selecting method and electronic device thereof - Google Patents
Communication channel selecting method and electronic device thereof Download PDFInfo
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- CN102769919B CN102769919B CN201110116607.2A CN201110116607A CN102769919B CN 102769919 B CN102769919 B CN 102769919B CN 201110116607 A CN201110116607 A CN 201110116607A CN 102769919 B CN102769919 B CN 102769919B
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Abstract
The invention discloses a communication channel selecting method and an electronic device of the communication channel selecting method. The communication channel selecting method comprises the following steps: determining an available channel in a second communication protocol according to the channel code number used in a first communication protocol; and selecting one of the available channels according to the number of wireless connecting points so as to avoid or lighten the interference between two communication protocols.
Description
Technical field
The present invention relates to a kind of communication channel system of selection and electronic installation thereof, particularly relate to a kind of avoid two kinds of communications protocols to interfere with each other communication channel system of selection and electronic installation.
Background technology
The high frequency range epoch are marched toward at present, in the idea of mechanics of communication last mile (Last Mile), often visible by global intercommunication microwave access (Worldwide Interoperability for Microwave Access, referred to as WiMAX) network equipment of communications protocol is placed in and connects with the final stage of network service supplier (Internet ServiceProvider is called for short ISP).The user of various local area network system, can connect the network equipment being provided with WiMAX communications protocol, obtains the service of high frequency range by this network equipment.In addition, focus (Hotspot) communication device in city also applies this concept, at focus communication device, WiMAX communications protocol and modal radio area network communications protocol are set simultaneously, such as WiFi (Wireless Fidelity) communications protocol, user can connect the focus communication device in city by the electronic installation with WiFi communication agreement module, this focus communication device is connected to network service supplier by WiMAX communications protocol again.
But in focus communication device, two kinds of communications protocol frequency bands are close, may interfere with each other.Such as WiMAX communications protocol and WiFi communication are reached an agreement on and are coexisted in focus communication device, and WiMAX communications protocol operates in the frequency band of 2.3GHz ~ 2.4GHz or 2.5GHz ~ 2.7GHz, and WiFi communication agreement operates in the frequency band of 2.4GHz ~ 2.48GHz.When supporting the transceiver module power output of WiMAX communications protocol in focus communication device, the signal quality of the WiFi communication agreement transmitting-receiving coexisted in focus communication device can be had influence on.Therefore, under such disturbing effect, overall volume of transmitted data (Throughput) can be reduced.
For avoiding the physical phenomenon interfered with each other, at present corresponding solution is that the agreement of fixing WiFi communication uses channel in the WiFi channel far away apart from WiMAX operating frequency, to reach an agreement on the stability that data under the environment that coexists transmit to ask for WiMAX communications protocol and WiFi communication.But this solution limits the channel selection of WiFi communication agreement, will volume of transmitted data be made far below the volume of transmitted data when all WiFi communication agreement channels all can be selected, and the otherness therefore caused is worth thinking to improve.
Summary of the invention
The invention provides a kind of communication channel system of selection and electronic installation thereof, to avoid or to alleviate the problem interfered with each other between two kinds of communications protocols.
The present invention proposes a kind of electronic installation, and this electronic installation comprises the first antenna element, the second antenna element, the first detecting unit, the second detecting unit, memory cell and control unit.First antenna element supports the first communications protocol, and the frequency band of this first communications protocol is divided into multiple first channel.Second antenna element supports the second communications protocol, and the frequency band of this second communications protocol is divided into multiple second channel.First detecting unit is coupled to the first antenna element and the second antenna element, and the first detecting unit is when each first channel is used, and measures the transmission numerical value of above-mentioned multiple second channel.Second detecting unit is coupled to the second antenna element, in order to detect the radio access point quantity on each second channel.Memory cell is coupled to the first detecting unit and the second detecting unit, and memory cell provides memory space, in order to be stored in transmission numerical value and the radio access point quantity of each second channel when each first channel is used.Control unit is coupled to memory cell, in order to according to transmission numerical value and radio access point quantity, in above-mentioned multiple second channel, selects the second channel simultaneously used with the first channel used.
In one embodiment of this invention, above-mentioned control unit utilizes above-mentioned first antenna element to obtain the first channel number used at present, and according to the first channel number, in above-mentioned multiple second channel, determine corresponding at least one available channel, when annoyance level between above-mentioned available channel and the first channel allows above-mentioned available channel and the first channel to use simultaneously, the transmission numerical value of above-mentioned available channel is more than or equal to stable transfer speed, then according to the quantity of the radio access point of competing in each above-mentioned available channel, one of them uses with the first channel used at present simultaneously to choose above-mentioned available channel.
In one embodiment of this invention, aforementioned stable transfer rate is the lowest data transmission rate of the second communications protocol defined.
In one embodiment of this invention, the transmission numerical value of each second channel when above-mentioned control unit is used according to each first channel number and each first channel sets up a look-up table, in look-up table, record corresponds to the first channel of each first channel number when being used, each second channel that simultaneously can use with the first channel, control unit store look-up tables is in memory cell, and control unit utilizes look-up table, in each second channel, obtain above-mentioned available channel from look-up table according to the first channel number.
In one embodiment of this invention, the above-mentioned control unit available channel of choosing the minimum number of the radio access point of competition in above-mentioned available channel and the first channel of using at present use simultaneously.
In one embodiment of this invention, have the signal strength of radio access point to be less than a threshold value if above-mentioned, then this radio access point does not include the calculating of the quantity of the radio access point of above-mentioned competition in.
In one embodiment of this invention, above-mentioned first communications protocol is radio wide area network communications protocol.
In one embodiment of this invention, above-mentioned radio wide area network communications protocol is global intercommunication microwave access (WiMAX) standard, third generation communication system partner Long Term Evolution (3GPP LTE) standard or advanced Long Term Evolution (3GPP LTE-Advanced) standard of third generation communication system partner.
In one embodiment of this invention, above-mentioned second communications protocol is radio area network communications protocol.
In one embodiment of this invention, above-mentioned radio area network communications protocol is WiFi standard or 802.11 standards.
In one embodiment of this invention, above-mentioned 802.11 standards are 802.11a standard, 802.11b standard, 802.11g standard or 802.11n standard.
The present invention proposes a kind of communication channel system of selection, performed by an electronic installation, this electronic installation supports the first communications protocol and the second communications protocol, the frequency band of the first communications protocol is divided into multiple first channel, the frequency band of the second communications protocol is divided into multiple second channel, this communication channel system of selection comprises: when each first channel is used, measure the transmission numerical value of above-mentioned multiple second channel, and the radio access point quantity detected on each second channel, according to transmission numerical value and radio access point quantity, in above-mentioned multiple second channel, the second channel that the first channel selected and using uses simultaneously.
Based on above-mentioned, communication channel system of selection of the present invention can measure the disturbance regime between two kinds of communications protocols of same electronic installation, stores the data measuring gained in an electronic.Then above data selection can the second communications protocol channel, and according to the radio access point quantity in above-mentioned available channel, one of them of decision available channel uses with the first channel used at present simultaneously, to avoid or to alleviate the interference between two kinds of communications protocols, and then improve communication quality.
For making above-mentioned feature and advantage of the present invention become apparent, special embodiment below, and be described with reference to the accompanying drawings as follows.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of a kind of electronic installation according to one embodiment of the invention.
Fig. 2 is the flow chart of a kind of communication channel system of selection according to one embodiment of the invention.
Fig. 3 A and Fig. 3 B disturbs schematic diagram according to the communication channel of one embodiment of the invention.
Fig. 4 A and Fig. 4 B disturbs schematic diagram according to the communication channel of another embodiment of the present invention.
Reference numeral explanation
100: electronic installation
110: the first antenna elements
120: the second antenna elements
130: the first detecting units
140: the second detecting units
150: memory cell
160: control unit
210 ~ 230: process step
310,360,410,460:WiMAX frequency band
320,330,370,380,420,430,470,480:WiFi frequency band
XCH (0), XCH (1), XCH (2), XCH (3): WiMAX channel
Detailed description of the invention
Fig. 1 is the functional block diagram of a kind of electronic installation according to one embodiment of the invention, Fig. 2 is the flow chart of a kind of communication channel system of selection according to one embodiment of the invention, communication channel system of selection referring to Fig. 1 and Fig. 2, Fig. 2 carries out communication channel selection with electronic installation 100.Electronic installation 100 can be the similar electronic installation of mobile phone, personal digital assistant (personal digital assistant, be called for short PDA), tablet PC, mobile computer, desktop PC etc.As long as multiple communications protocol supported by certain electronic installation, the frequency band of these communications protocols is respectively divided into multiple channel, and these communications protocols are because the frequency band used is close to interfering with each other, and namely the communication channel system of selection of the present embodiment is suitable for.In addition, the focus communication device of electronic installation 100 also in city, support two kinds of communications protocols, such as user is connected to focus communication device by WiFi communication agreement, and focus communication device is connected to network service supplier by WiMAX again, therefore, the communication channel system of selection of Fig. 2 is also applicable to focus communication device.
Fig. 3 A and Fig. 3 B is that the communication channel of the embodiment of the present invention disturbs schematic diagram.These two kinds of communications protocols of WiFi and WiMAX supported by the electronic installation 100 of the present embodiment.The frequency band of WiFi is the frequency band of 2.4GHz to 2.48GHz, WiMAX is 2.5GHz to 2.7GHz.The WiMAX channel of current use is determined by WiMAX base station, but the channel that electronic installation can select WiFi to use.Wherein, each WiFi channel is correspond to the different frequency on WiFi frequency band, and each WiMAX channel then corresponds to the different frequency on WiMAX frequency band.
As shown in Figure 3A, WiMAX frequency band 310 is 2.5GHz to 2.7GHz, when the WiMAX channel in using belongs to midband or the high frequency band of this frequency band, as XCH (0) channel is positioned at comparatively near the high frequency band of 2.7GHz, now under the interference of not receiving and dispatching signal by WiMAX, WiFi, from the paramount frequency band of low-frequency band, can have more available channel selective.On the other hand, Fig. 3 A meta may be disturbed by the transmitting-receiving signal of WiMAX at the channel of WiFi frequency band 320, and be positioned at the channel of WiFi frequency band 330, then the channel of the lowest data transmission rate of WiFi communication agreement defined is more than or equal to for transmission numerical value still can be maintained.
Comparatively speaking, as shown in Figure 3 B, WiMAX frequency band 360 is 2.5GHz to 2.7GHz, if when the WiMAX channel in using belongs to the low-frequency band in this frequency band, if XCH (1) channel is comparatively near 2.5GHz, now under the interference of not receiving and dispatching signal by WiMAX, available channel that can be selective in WiFi is then less.And in figure 3b, the channel being positioned at WiFi frequency band 370 may be disturbed by the transmitting-receiving signal of WiMAX, and be positioned at the channel of WiFi frequency band 380, be then more than or equal to the channel of the lowest data transmission rate of WiFi communication agreement defined for transmission numerical value still can be maintained.
Fig. 4 A and Fig. 4 B is the communication channel interference schematic diagram according to another embodiment of the present invention.WiMAX frequency band 410 is 2.3GHz to 2.4GHz, if when the WiMAX channel in using belongs to the low-frequency band in this frequency band, if XCH (2) channel is comparatively near 2.3GHz, now under the interference of not receiving and dispatching signal by WiMAX, available channel that can be selective in WiFi is then more.And in Figure 4 A, the channel being positioned at WiFi frequency band 420 may be disturbed by the transmitting-receiving signal of WiMAX, and be positioned at the channel of WiFi frequency band 430, be then more than or equal to the channel of the lowest data transmission rate of WiFi communication agreement defined for transmission numerical value still can be maintained.
Comparatively speaking, when the WiMAX channel in using belongs to midband or the high frequency band of this frequency band, as XCH (3) channel is positioned at comparatively near 2.4GHz, the channel being now positioned at WiFi frequency band 470 may be disturbed by the transmitting-receiving signal of WiMAX, and be positioned at the channel of WiFi frequency band 480, then the channel of the lowest data transmission rate of WiFi communication agreement defined is more than or equal to for transmission numerical value still can be maintained.
And based on above in same electronic installation, the communication channel interference phenomenon of two kinds of communications protocols (WiMAX and WiFi) describes, communication channel system of selection proposed by the invention and electronic installation thereof are below described.
Referring to Fig. 1 and Fig. 2.Electronic installation 100 comprises the first antenna element 110, second antenna element 120, first detecting unit 130, second detecting unit 140, memory cell 150 and control unit 160.Wherein, the first antenna element 110 supports the first communications protocol, and the frequency band of this first communications protocol is divided into multiple first channel.Second antenna element 120 supports the second communications protocol, and the frequency band of this second communications protocol is divided into multiple second channel.
First detecting unit 130 is coupled to the first antenna element 110 and the second antenna element 120, first detecting unit 110, when each first channel is used, measures the transmission numerical value (Throughput) (step 210) of above-mentioned multiple second channel.Second detecting unit 140 is coupled to the second antenna element 120, in order to detect radio access point (Access point) quantity (step 220) on each second channel.
Memory cell 150 is coupled to the first detecting unit 130 and the second detecting unit 140, and memory cell 150 provides memory space, in order to be stored in transmission numerical value and the radio access point quantity of each second channel when each first channel is used.Memory cell 150 in electronic installation 100 can be the storage device of any patterns such as floppy disk, storage card and hard disk, but is not limited to above-mentioned.
Control unit 160 is coupled to memory cell 150, in order to according to transmission numerical value and radio access point quantity, in above-mentioned multiple second channel, selects the second channel (step 230) simultaneously used with the first channel used.The detailed embodiment of control unit 160 is that control unit 160 utilizes the first antenna element 110 to obtain the first channel number used at present, and according to the first channel number, in above-mentioned multiple second channel, determines at least one corresponding available channel.
And available channel is defined as and annoyance level between the first channel, when available channel and the first channel can be allowed to use simultaneously, the transmission numerical value of available channel is more than or equal to stable transfer speed, and wherein stable transfer speed is the lowest data transmission rate of the second communications protocol defined.Such as in the present embodiment, WiFi available channel is defined as and can uses with the WiMAX channel used simultaneously and receive and dispatch signal power disturb or be only subject to slight interference by WiMAX, still can maintain to transmit numerical value and be more than or equal to WiFi communication and reach an agreement on the channel of lowest data transmission rate of defined.The lowest data transmission rate of above-mentioned WiFi communication agreement defined can be referred to as stable transfer speed.
In addition, a look-up table also can be utilized to obtain above-mentioned available channel.The transmission numerical value of each second channel when control unit 160 is used according to each first channel number and each first channel sets up look-up table, in this look-up table, record corresponds to the first channel of each first channel number when being used, can each second channel of simultaneously using of the first channel therewith, and control unit 160 stores this look-up table in memory cell 150, and control unit 160 utilizes this look-up table, according to the first channel number since then look-up table in each second channel, obtain above-mentioned available channel.
Then, according to the quantity of the radio access point of competing in each available channel, the available channel that control unit 160 chooses the minimum number of the radio access point of competition in available channel and the first channel used at present use simultaneously.Wherein, if there is the signal strength of radio access point to be less than a threshold value, then this radio access point does not include the calculating of the quantity of the radio access point of above-mentioned competition in.
And in the present embodiment, this communication channel system of selection is used in the situation that Wimax and WiFi two kinds of communications protocols use simultaneously, embodiment is as following.First, obtain the channel number of the WiMAX used at present from the first antenna element 110, then according to WiMAX channel number, obtain corresponding WiFi available channel at present.In a lookup table, the WiFi available channel of each WiMAX channel corresponding may not only one, now according to the radio access point quantity of competing in each WiFi available channel, control unit 160 is chosen one of them WiFi available channel and is used with the WiMAX channel used simultaneously, in the present embodiment, control unit 160 is chosen at the WiFi available channel of the radio access point minimum number of competition in above-mentioned available channel.
After look-up table obtains current corresponding WiFi available channel, electronic installation obtains the radio access point quantity of competing in each WiFi available channel, and the signal strength of each above-mentioned radio access point (Received Signal Strength Indicator, RSSI) information.Radio access point in above-mentioned WiFi available channel, if the signal strength that there is radio access point is less than threshold value (this threshold value is by the systemic presupposition of electronic installation), then this radio access point does not include the calculating of the radio access point quantity of above-mentioned competition in, in a certain available channel of WiFi, such as there is multiple radio access point in the competition channel right to use, but wherein have the signal strength of 1 radio access point to be less than threshold value, at this moment this radio access point does not then include counting in.Such as shown in form 1, now WiFi has 5 available channels available, and each available channel has corresponding radio access point quantity, and then deduction falls the radio access point quantity that signal strength is less than threshold value, obtains the radio access point quantity after filtering.After filtering out the more weak radio access point of signal strength according to above-mentioned steps, the WiFi available channel of current radio access point minimum number chosen by electronic installation, use with the WiMAX channel used simultaneously, as the WiFi channel of the numbering 4 in form 1, radio access point quantity after filtration is minimum, then control unit 160 selects this channel to use with the WiMAX channel used simultaneously.
Form 1
In sum, the present invention, according to the transmitting-receiving signal power of WiMAX at each channel, finds out corresponding WiFi available channel, and stores these corresponding measurement results in this electronic installation.Electronic installation according to measurement result, according to the radio access point quantity of competing in each available channel of WiFi, can determine the WiFi channel that now will use afterwards.The communication channel system of selection that the present invention proposes, no longer just as solution in the past, avoid interference with the channel of fixing WiFi, and be to provide multiple WiFi available channel and utilize above-mentioned system of selection to carry out dynamic conditioning, to expanding the message transmission rate of WiFi.Thus, electronic installation just can use WiFi and WiMAX communications protocol simultaneously, and the problem that both can be avoided to interfere with each other.In addition, should be noted that WiMAX and the WiFi frequency band of various countries' defined is not quite similar, but the application of the present embodiment is not limited to above-mentioned WiMAX and WiFi frequency band range.
In addition, these two kinds of communications protocols of WiFi and WiMAX supported by the electronic installation of the present embodiment, but scope of the present invention is not limited to this, above two kinds of communications protocols can be replaced into other communications protocols connatural, wherein WiMAX communications protocol can replace with the radio wide area network communications protocol of other form, such as third generation communication system partner Long Term Evolution (3
rdgeneration Partnership ProjectLong Term Evolution, 3GPP LTE) standard, or advanced Long Term Evolution (3GPP LTE-Advanced) standard of third generation communication system partner.And WiFi communication agreement can replace with the radio area network communications protocol of other form, such as 802.11 standards of IEEE (IEEE) or the supplementary version of 802.11 standards, as 802.11a standard, 802.11b standard, 802.11g standard or 802.11n standard.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention, those skilled in the art, under the premise without departing from the spirit and scope of the present invention; can do some changes and retouching, therefore protection scope of the present invention is as the criterion with claim of the present invention.
Claims (16)
1. an electronic installation, comprising:
One first antenna element, it supports one first communications protocol, and the frequency band of this first communications protocol is divided into multiple first channel;
One second antenna element, it supports one second communications protocol, and the frequency band of this second communications protocol is divided into multiple second channel;
One first detecting unit, is coupled to this first antenna element and this second antenna element, and this first detecting unit, when respectively this first channel is used, measures a transmission numerical value of above-mentioned multiple second channel;
One second detecting unit, is coupled to this second antenna element, in order to detect the quantity of the radio access point of respectively this second channel being competed;
One memory cell, be coupled to this first detecting unit and this second detecting unit, this memory cell provides a memory space, this transmission numerical value of respectively this second channel during in order to be stored in that respectively this first channel is used and the quantity of the radio access point of this competition; And
One control unit, is coupled to this memory cell, in order to the quantity of the radio access point according to this transmission numerical value and this competition, in above-mentioned multiple second channel, selects this second channel simultaneously used with this first channel used.
2. electronic installation as claimed in claim 1, wherein this control unit utilizes this first antenna element to obtain one first channel number used at present, and according to this first channel number, in above-mentioned multiple second channel, determine corresponding at least one available channel, when annoyance level between above-mentioned available channel and this first channel allows above-mentioned available channel and this first channel to use simultaneously, this transmission numerical value of above-mentioned available channel is more than or equal to a stable transfer speed, then according to the quantity of the radio access point of competing in each above-mentioned available channel, one of them uses with this first channel used at present simultaneously to choose above-mentioned available channel.
3. electronic installation as claimed in claim 2, wherein this stable transfer speed is the lowest data transmission rate of this second communications protocol defined.
4. electronic installation as claimed in claim 2, wherein this control unit according to each this first channel number and respectively this first channel is used time this transmission numerical value of respectively this second channel set up a look-up table, when this first channel that in this look-up table, record corresponds to each this first channel number is used, respectively this second channel that simultaneously can use with this first channel, this control unit stores this look-up table in this memory cell, and this control unit utilizes this look-up table, in each this second channel, obtain above-mentioned available channel from this look-up table according to this first channel number.
5. electronic installation as claimed in claim 2, wherein this control unit this available channel of choosing the minimum number of the radio access point of competition in above-mentioned available channel and this first channel of using at present use simultaneously.
6. electronic installation as claimed in claim 5, if wherein there is the signal strength of radio access point to be less than a threshold value, then this radio access point does not include the calculating of the quantity of the radio access point of above-mentioned competition in.
7. electronic installation as claimed in claim 1, wherein this first communications protocol is radio wide area network communications protocol.
8. electronic installation as claimed in claim 1, wherein this second communications protocol is radio area network communications protocol.
9. a communication channel system of selection, performed by an electronic installation, this electronic installation supports one first communications protocol and one second communications protocol, the frequency band of this first communications protocol is divided into multiple first channel, the frequency band of this second communications protocol is divided into multiple second channel, and this communication channel system of selection comprises:
When respectively this first channel is used, measure a transmission numerical value of above-mentioned multiple second channel;
Detect the quantity of the radio access point of respectively this second channel being competed; And
According to the quantity of the radio access point of this transmission numerical value and this competition, in above-mentioned multiple second channel, select and this second channel that this first channel of using uses simultaneously.
10. communication channel system of selection as claimed in claim 9, wherein according to the quantity of the radio access point of this transmission numerical value and this competition, in above-mentioned multiple second channel, the step of this second channel simultaneously used with this first channel used is selected also to comprise:
Obtain one first channel number used at present;
According to this first channel number, in above-mentioned multiple second channel, determine corresponding at least one available channel, when annoyance level between above-mentioned available channel and this first channel allows above-mentioned available channel and this first channel to use simultaneously, this transmission numerical value of above-mentioned available channel is more than or equal to a stable transfer speed; And
According to the quantity of the radio access point of competing in each above-mentioned available channel, one of them uses with this first channel used at present simultaneously to choose above-mentioned available channel.
11. communication channel systems of selection as claimed in claim 10, wherein this stable transfer speed is the lowest data transmission rate of this second communications protocol defined.
12. communication channel systems of selection as claimed in claim 10, also comprise:
According to each this first channel number and respectively this first channel is used time this transmission numerical value of respectively this second channel set up a look-up table, when this first channel that in this look-up table, record corresponds to each this first channel number is used, respectively this second channel that simultaneously can use with this first channel; And
According to this first channel number, in each this second channel, obtain above-mentioned available channel from this look-up table.
13. communication channel systems of selection as claimed in claim 10, wherein this electronic installation is chosen the step that above-mentioned available channel one of them and this first channel of using at present use simultaneously and is comprised:
This available channel that this electronic installation is chosen at the minimum number of the radio access point of competition in above-mentioned available channel and this first channel used at present use simultaneously.
14. communication channel systems of selection as claimed in claim 13, if wherein there is the signal strength of radio access point to be less than a threshold value, then this radio access point does not include the calculating of the quantity of the radio access point of above-mentioned competition in.
15. communication channel systems of selection as claimed in claim 9, wherein this first communications protocol is radio wide area network communications protocol.
16. communication channel systems of selection as claimed in claim 9, wherein this second communications protocol is radio area network communications protocol.
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| CN104010389A (en) * | 2013-02-22 | 2014-08-27 | 鸿富锦精密工业（深圳）有限公司 | System and method for reducing coexistent interferences between WiMAX module and WiFi module |
| TWI540927B (en) * | 2014-09-26 | 2016-07-01 | 緯創資通股份有限公司 | Connection method and electronic device |
| CN105517100B (en) * | 2015-12-04 | 2019-02-12 | Oppo广东移动通信有限公司 | A kind of Multi net voting cut-in method and mobile terminal |
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| US20050007979A1 (en) * | 2003-07-07 | 2005-01-13 | Intel Corporation | Uniform channel spreading in a wireless local area network using dynamic frequency selection |
| CN101222691B (en) * | 2007-01-08 | 2011-03-02 | 中兴通讯股份有限公司 | Restraining method and circuit for double-module mobile phone channel selective disturbance |
| US20090143095A1 (en) * | 2007-11-14 | 2009-06-04 | St Wireless Sa | Inter-mode interference prevention in a multimode wireless device |
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