CN104902455A - Device discovery method and device of device-to-device (D2D) communication - Google Patents
Device discovery method and device of device-to-device (D2D) communication Download PDFInfo
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- CN104902455A CN104902455A CN201410081256.XA CN201410081256A CN104902455A CN 104902455 A CN104902455 A CN 104902455A CN 201410081256 A CN201410081256 A CN 201410081256A CN 104902455 A CN104902455 A CN 104902455A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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Abstract
The invention provides a device discovery method and device of device-to-device (D2D) communication used for a mobile communication terminal. The device discovery method of device-to-device (D2D) communication includes a receiving step of selecting a device discovery subframe in a device discovery period and receiving signals of all resource units by utilizing the device discovery subframe; a determining step of determining an interference parameter of each resource unit; a judgment step of judging whether a resource unit set having interference parameters, indicating the degree of interference, smaller than that of the first resource unit exists and obtaining a judgment result; a first execution step of choosing a second resource unit from the resource unit set to be used as a resource unit for transmitting a detection signal next time if the judgment result indicates that the resource unit set having interference parameters smaller than that of the first resource unit exists. According to the invention, the problem of low success rate of device discovery caused by the signal interference and collision in the D2D device discovery process is solved, candidate resources can be reasonably allocated, and the success rate of D2D device discovery is increased.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to method for discovering equipment and the device of a kind of D2D communication.
Background technology
In order to make full use of existing frequency spectrum resource, third generation partner program (3GPP, Third Generation Partnership Projects) tissue proposes the technology of a kind of device-to-device (D2D, Device-to-Device) direct communication.This technology is the participation utilizing mutually contiguous user's direct communication and do not need base station in traditional communication networking.And D2D communication user is by improving the utilance of frequency spectrum with honeycomb residence user shared resource.In addition, it can also alleviate the burden of cellular network, reduces the battery power consumption of mobile terminal, increases bit rate, improves the robustness etc. of network infrastructure fault, can also support the novel service of Point-to-Point Data among a small circle.
In addition, D2D communication is also the needs in order to tackle public safety field.When there is large-scale natural calamity, as earthquake, mountain torrents etc., cause destructive destruction often to the cellular communications networks of existing deployment, the disappearance of cellular network signals makes mobile terminal cannot carry out necessary communication, brings very large difficulty to the disaster relief.And the D2D communication technology can avoid the appearance of this situation, when not having cellular network signals, can realize the direct communication of terminal room, this can bring very large convenience to disaster relief rescue.
An important technology of D2D communication and prerequisite are the mutual discovery procedures between D2D subscriber equipment, i.e. D2D device discovery procedure.A kind of consideration is that each D2D user distributes proprietary detection resource and completes its device discovery procedure by cellular network.The shortcoming of the method is that cellular network burden is heavier, and needs to ensure that this detection resource can not be interfered within the device discovery cycle.And under this method of what is more important is not suitable for without cellular network condition.Another consideration is: for all D2D Equipments Setting or preset candidate resource, and the detection resource of D2D user from candidate resource needed for Stochastic choice completes its device discovery procedure.The method reduce or do not need the participation of network side, therefore also can be applicable to without cellular network condition.But shortcoming is when multiple D2D user carries out D2D device discovery simultaneously, owing to being detection resource collision selected by therefore random selecting detection resource may cause, and, in the band of neighbouring phone user, neighboring trace radiation signal is selected because near-far interference may also can interfere with detects resource, causes device discovery success rate low.Therefore be necessary that studying a kind of method solves this problem, thus improve the probability of success of D2D communication equipment discovery.Summary of the invention
In view of this, the invention provides method for discovering equipment and the device of a kind of D2D communication, solving signal disturbing that prior art occurs in D2D device discovery procedure, collide the low problem of the device discovery success rate that causes, and reasonably utilize the resource being used for device discovery.
For solving the problem, the invention provides the method for discovering equipment that a kind of D2D communicates, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and described method for discovering equipment comprises:
Receiving step, within the device discovery cycle, chooses a device discovery subframe, and the described device discovery subframe that utilization is selected receives the signal on all resource units;
Determining step, determines the interference parameter on each resource units, and described interference parameter to embody on corresponding resource units described signal to the annoyance level of the detectable signal newly added;
Determining step, according to described interference parameter, judge whether to there is the annoyance level resource units set less than the described interference parameter of first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
First performs step, when the instruction of described judged result exists the annoyance level resource units set less than the described interference parameter of described first resource unit, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
Preferably, described interference parameter is the power on described resource units, and the power on described resource units is higher, and the interference parameter on described resource units is larger.
Preferably, described signal comprises all detectable signals taking described resource units; Described power comprises the power of the described all detectable signals taking described resource units.
Preferably, described signal comprises the interference signal taking described resource units further; Described power comprises the power of the described interference signal taking described resource units further.
Preferably, described method for discovering equipment comprises further:
Second performs step, when the instruction of described judged result does not exist the annoyance level resource units set less than the described interference parameter of first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
Preferably, described receiving step is specially: in the device discovery cycle, device discovery subframe described in one is chosen in every K device discovery subframe connects, the device discovery subframe of the signal on all resource units is received as this, and utilize the described device discovery subframe selected to receive signal on all resource units, wherein K be more than or equal to 2 integer.
The device discovery device that the present invention also provides a kind of D2D to communicate, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and described device discovery device comprises:
Receiver module, within the device discovery cycle, chooses a device discovery subframe, and the described device discovery subframe that utilization is selected receives the signal on all resource units;
Determination module, determines the interference parameter on each resource units, and described interference parameter to embody on corresponding resource units described signal to the annoyance level of the detectable signal newly added;
Judge module, according to described interference parameter, judge whether to there is the annoyance level resource units set less than the described interference parameter of first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
First Executive Module, when the instruction of described judged result exists the annoyance level resource units set less than the described interference parameter of described first resource unit, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
Preferably, described interference parameter is the power on described resource units, and the power on described resource units is higher, and the interference parameter on described resource units is larger.
Preferably, described device discovery device comprises further:
Second Executive Module, when the instruction of described judged result does not exist the annoyance level resource units set less than the described interference parameter of first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
The method for discovering equipment of D2D communication of the present invention and device, by finding the resource of the little resource units of interference parameter as emission detection signal, solve in the discovery procedure of D2D equipment, the problem that device discovery success rate caused by signal disturbing, collision is low, reasonably be assigned with candidate resource, add the success rate of D2D device discovery.
Accompanying drawing explanation
Fig. 1 is a schematic flow sheet of the method for discovering equipment of the D2D communication of embodiments of the invention;
Fig. 2 is a structural representation of the device discovery device of the D2D communication of embodiments of the invention;
Fig. 3 is another schematic flow sheet of the method for discovering equipment of the D2D communication of embodiments of the invention;
Fig. 4 is the schematic diagram in a device discovery cycle of embodiments of the invention.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Fig. 1 is a schematic flow sheet of the method for discovering equipment of the D2D communication of embodiments of the invention.As shown in Figure 1, the invention provides the method for discovering equipment that a kind of D2D communicates, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and described method for discovering equipment comprises:
Receiving step 101, within the device discovery cycle, chooses a device discovery subframe, and the described device discovery subframe that utilization is selected receives the signal on all resource units;
Determining step 102, determines the interference parameter on each resource units, and described interference parameter to embody on corresponding resource units described signal to the annoyance level of the detectable signal newly added;
Determining step 103, according to described interference parameter, judge whether to there is the annoyance level resource units set less than the described interference parameter of first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
First performs step 104, when the instruction of described judged result exists the annoyance level resource units set less than the described interference parameter of described first resource unit, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
Adopt the method for discovering equipment of the D2D communication of above-described embodiment, within the device discovery cycle, by being compared by the described interference parameter on the interference parameter of the expression annoyance level on the resource units of this emission detection signal and all the other resource units, obtain the resource units of the little resource units of described interference parameter as emission detection signal next time.So, solve in the discovery procedure of D2D equipment, the problem that the device discovery success rate caused by signal disturbing, collision is low, be reasonably assigned with candidate resource, add the success rate of D2D device discovery.
Preferably, described interference parameter can be the power on described resource units, and the power on described resource units is higher, and the interference parameter on described resource units is larger.
Very convenient as the parameter weighing annoyance level on described resource units using power, available received signal strength indicator (RSSI-Received Signal Strength Indication) technology realizes.
Preferably, described signal comprises all detectable signals taking described resource units; Described power comprises the power of the described all detectable signals taking described resource units.
D2D device discovery procedure is realized by emission detection signal on resource units, the power taking the detectable signal of described resource units is lower, the interference that described resource units is subject to is also less, then described resource units is more suitable as the resource of emission detection signal, and device discovery success rate is higher.Certainly, the situation that the interference of this described resource units only derives from the detectable signal taking it is ideal situation, and in a practical situation, the interference on described resource units may come from many ways.
Preferably, described signal comprises the interference signal taking described resource units further; Described power comprises the power of the described interference signal taking described resource units further.
Described interference signal may come from the interference of cellular network subscriber, also may come from the interference communicated between D2D own user.Overall consideration is carried out in interference source on described resource units, power measurement can be made more accurate, also more tally with the actual situation.The resource units of the carrying out so found emission detection signal is next time more accurate, and the success rate of D2D device discovery is also higher.
Preferably, described method for discovering equipment comprises further:
Second performs step, when the instruction of described judged result does not exist the annoyance level resource units set less than the described interference parameter of first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
Within the device discovery cycle, when there is no the resource units finding more suitably emission detection signal next time, continue emission detection signal, to continue device discovery procedure with original resource units.
The D2D user of the embodiment of the present invention is time division duplex user, namely the one that D2D user only may be in emission detection signal condition or accept in state detecting signal in certain device discovery subframe, conflict is not produced for making the process of reception and transmitting, described receiving step 101 is specially: in the device discovery cycle, device discovery subframe described in one is chosen in every K device discovery subframe connects, the device discovery subframe of the signal on all resource units is received as this, and the described device discovery subframe that utilization is selected receives the signal on all resource units, wherein K be more than or equal to 2 integer.
Above embodiment is only the preferred embodiments of the present invention, combining and modifying other drawn change modes, all should be considered as in protection scope of the present invention for above-mentioned various embodiment being carried out.
Fig. 2 is a structural representation of the device discovery device of the D2D communication of embodiments of the invention.As shown in Figure 2, the device discovery device that the present invention also provides a kind of D2D to communicate, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and described device discovery device comprises:
Receiver module, within the device discovery cycle, chooses a device discovery subframe, and the described device discovery subframe that utilization is selected receives the signal on all resource units;
Determination module, determines the interference parameter on each resource units, and described interference parameter to embody on corresponding resource units described signal to the annoyance level of the detectable signal newly added;
Judge module, according to described interference parameter, judge whether to there is the annoyance level resource units set less than the described interference parameter of first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
First Executive Module, when the instruction of described judged result exists the annoyance level resource units set less than the described interference parameter of described first resource unit, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
Preferably, described interference parameter is the power on described resource units, and the power on described resource units is higher, and the interference parameter on described resource units is larger.
Preferably, described device discovery device comprises further:
Second Executive Module, when the instruction of described judged result does not exist the annoyance level resource units set less than the described interference parameter of first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
Concrete, the device discovery device of the D2D communication of the present embodiment, by the configuration of above-mentioned each module, find resource units that described interference parameter is relatively little as the resource units of emission detection signal, rational Resources allocation, decreases due to signal disturbing, collides the low problem of the device discovery success rate that causes.
Fig. 3 is another schematic flow sheet of the method for discovering equipment of the D2D communication of embodiments of the invention.As shown in Figure 3, the method for discovering equipment of the D2D communication that the present embodiment provides, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and the method for discovering equipment of described D2D communication specifically comprises:
Receiving step 201, in the device discovery cycle, chooses a device discovery subframe in every K device discovery subframe connects, and utilizes described device discovery subframe to receive signal on all resource units, wherein K be more than or equal to 2 integer.
Fig. 4 is the schematic diagram in a device discovery cycle of embodiments of the invention.As shown in Figure 3, Figure 4, a device discovery cycle is made up of multiple device discovery subframe, and each device discovery subframe comprises the candidate resource of the device discovery that cellular network subscriber resource communicates with for D2D.The quantity of described device discovery subframe in the device discovery cycle; The size of each device discovery subframe; And for the candidate resource amount of device discovery of D2D communication, can in mobile communication terminal predetermined fixed value, also can be configured by cellular network side, and notify all D2D users by broadcast message.For LTE(LTE, Long-Term Evolution) system, each device discovery subframe can be the single 1ms subframe of LTE system, also can be multiple LTE system single sub-frame composition.Described candidate resource amount in each device discovery subframe can Resource Block (RB, the Resource Block) form in LTE system provide, such as: be 44 RB for the candidate resource of the device discovery of D2D communication in each device discovery subframe.Described resource units refers to the candidate resource that single D2D user's emission detection signal takies.Such as: a resource units can be take the Resource Block in 2 LTE system.The size of the described resource units shared by different D2D users can be identical, also can be not identical.
Described candidate resource is all spendable resource of all D2D users in a device discovery cycle, and is not the resource that certain D2D user exclusively enjoys.D2D user can therefrom select required resource units when doing device discovery.
In receiving step 201, the value of K can be preset by described mobile communication terminal, also can be specified by cellular network side.Consider that the D2D user in the present embodiment is time division duplex user, therefore K span is limited in the integer being more than or equal to 2, to make selected can using for the described device discovery subframe receiving the signal on all resource units.
Special instruction, the signal on all resource units of described reception not only comprises the signal on other resource units, also comprises the signal on the resource units of this emission detection signal.Described signal comprises all detectable signals and interference signal that take described resource units.
Determining step 202, determines the power on each resource units.
Concrete, according to the signal strength signal intensity on each described resource units received, determine the described power on described each resource units.Described power comprises the power of the described all detectable signals taking described resource units and the power of described interference signal.
Determining step 203, judge whether the resource units set of the low XdB of described power that there is power ratio first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
Watt level on a resource units reacts the annoyance level that this resource units is subject to, and the power on described resource units is higher, and illustrate that the interference that this resource units is subject to is larger, its emissivities are also more weak; Otherwise the power on described resource units is lower, illustrate that the interference that this resource units is subject to is less, its emissivities are also stronger.
In the present embodiment, the large I of value of X is preset by described mobile communication terminal, and also can be configured by cellular network side, such as, X can be configured to 6dB.
Determining step 203 is intended to find the resource units set that whether there are emissivities and be better than the resource units of this emission detection signal.
First performs step 204, when the instruction of described judged result exists the resource units set of the low XdB of described power of first resource unit described in power ratio, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
Second Executive Module 205, when the instruction of described judged result does not exist the resource units set of the low XdB of described power of power ratio first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
Find emissivities to be better than by step 204,205 or equal the resource units of this emission detection signal, as the resource of emission detection signal next time.Within a device discovery cycle, repeat the process of step 201 ~ 205, until described device discovery end cycle.So, be not only reasonably assigned with candidate resource, also reduce the low problem of device discovery success rate caused by signal disturbing, collision simultaneously.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a method for discovering equipment for D2D communication, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and it is characterized in that, described method for discovering equipment comprises:
Receiving step, within the device discovery cycle, chooses a device discovery subframe, and the described device discovery subframe that utilization is selected receives the signal on all resource units;
Determining step, determines the interference parameter on each resource units, and described interference parameter to embody on corresponding resource units described signal to the annoyance level of the detectable signal newly added;
Determining step, according to described interference parameter, judge whether to there is the annoyance level resource units set less than the described interference parameter of first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
First performs step, when the instruction of described judged result exists the annoyance level resource units set less than the described interference parameter of described first resource unit, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
2. method according to claim 1, is characterized in that, described interference parameter is the power on described resource units, and the power on described resource units is higher, and the interference parameter on described resource units is larger.
3. method according to claim 2, is characterized in that, described signal comprises all detectable signals taking described resource units; Described power comprises the power of the described all detectable signals taking described resource units.
4. method according to claim 3, is characterized in that, described signal comprises the interference signal taking described resource units further; Described power comprises the power of the described interference signal taking described resource units further.
5. method according to claims 1 to 4, is characterized in that, comprises further:
Second performs step, when the instruction of described judged result does not exist the annoyance level resource units set less than the described interference parameter of first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
6. method according to claim 1, it is characterized in that, described receiving step is specially: in the device discovery cycle, device discovery subframe described in one is chosen in every K device discovery subframe connects, the device discovery subframe of the signal on all resource units is received as this, and utilize the described device discovery subframe selected to receive signal on all resource units, wherein K be more than or equal to 2 integer.
7. a device discovery device for D2D communication, for mobile communication terminal, described mobile communication terminal can utilize the resource units transmitting in candidate resource set for the detectable signal of device discovery, and it is characterized in that, described device discovery device comprises:
Receiver module, within the device discovery cycle, chooses a device discovery subframe, and the described device discovery subframe that utilization is selected receives the signal on all resource units;
Determination module, determines the interference parameter on each resource units, and described interference parameter to embody on corresponding resource units described signal to the annoyance level of the detectable signal newly added;
Judge module, according to described interference parameter, judge whether to there is the annoyance level resource units set less than the described interference parameter of first resource unit, obtain a judged result, described first resource unit is the resource units of this emission detection signal of described mobile communication terminal;
First Executive Module, when the instruction of described judged result exists the annoyance level resource units set less than the described interference parameter of described first resource unit, from described resource units set, select Secondary resource unit as the resource units of emission detection signal next time.
8. device according to claim 7, is characterized in that, described interference parameter is the power on described resource units, and the power on described resource units is higher, and the interference parameter on described resource units is larger.
9. the device according to claim 7 or 8, is characterized in that, comprises further:
Second Executive Module, when the instruction of described judged result does not exist the annoyance level resource units set less than the described interference parameter of first resource unit, still using described first resource unit as the resource units of emission detection signal next time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410081256.XA CN104902455A (en) | 2014-03-06 | 2014-03-06 | Device discovery method and device of device-to-device (D2D) communication |
| PCT/CN2014/084318 WO2015131493A1 (en) | 2014-03-06 | 2014-08-13 | Device discovering method and device discovering apparatus for d2d communication |
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| CN201410081256.XA CN104902455A (en) | 2014-03-06 | 2014-03-06 | Device discovery method and device of device-to-device (D2D) communication |
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| CN104902455A true CN104902455A (en) | 2015-09-09 |
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| WO (1) | WO2015131493A1 (en) |
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| WO2015131493A1 (en) | 2015-09-11 |
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