CN104113832A - Power control method and power control system used for direct communication of terminal, and base station - Google Patents
Power control method and power control system used for direct communication of terminal, and base station Download PDFInfo
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- CN104113832A CN104113832A CN201410367340.8A CN201410367340A CN104113832A CN 104113832 A CN104113832 A CN 104113832A CN 201410367340 A CN201410367340 A CN 201410367340A CN 104113832 A CN104113832 A CN 104113832A
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Abstract
The invention provides a power control method used for direct communication of a terminal, a power control system used for the direct communication of the terminal and a base station. The power control method used for the direct communication of the terminal comprises the steps of: obtaining a coupling loss value of an uplink signal between the terminal and a D2D terminal; selecting a power control parameter corresponding to a range based on the range which the coupling loss value locates; sending the power control parameter corresponding to the range to the D2D terminal so as to enable the D2D terminal to configure a transmission power for transmitting the D2D signal based the power control parameter. Through the technical scheme, the transmitting power of the D2D terminal is controlled, coherent jamming between the D2D terminal and an LTE (Long Term Evolution) terminal is reduced, and quality of the D2D communication and cellular network is improved.
Description
Technical field
The present invention relates to communication technical field, in particular to a kind of Poewr control method for the direct-connected communication of terminal, a kind of power control system for the direct-connected communication of terminal and a kind of base station.
Background technology
At present, at D2D (Device to Device, equipment room direct communication) in the ordinary terminal of the cellular network such as terminal and LTE (Long Term Evolution, Long Term Evolution) situation about coexisting, D2D terminal is conventionally with full power transmitting information; Ordinary terminal has carried out open Loop Power control according to path loss, antenna gain etc., and the transmitting power of ordinary terminal is conventionally all smaller.In the time that D2D communication occurs with common communications (as LTE communicates by letter) simultaneously, base station is in receiving the signal of ordinary terminal transmitting, also can receive transmitting of D2D terminal, if D2D terminal is nearer apart from base station compared with ordinary terminal, the transmitting power of the D2D terminal that base station receives may be larger than the transmitting power of the ordinary terminal receiving, and then the D2D signal that D2D terminal sends can cause very large interference to ordinary terminal, the signal to noise ratio and the throughput that have reduced ordinary terminal, affect the proper communication of ordinary terminal.
In addition, if D2D terminal is adopted to the power control mode the same with ordinary terminal, there will be following problem: in the fringe region away from from base station, the power control dynamics of ordinary terminal is less, substantially all launch with relatively high power, the interference meeting that is now subject to D2D terminal is smaller.And if in this case D2D terminal is carried out to power control, and when receiving terminal in D2D communication is nearer apart from ordinary terminal, the interference meeting that D2D terminal receives very large (consider that D2D communicate by letter the situation of multiplexing LTE ascending resource), affect normally carrying out that D2D communicates by letter.Specifically as shown in Figure 1, terminal A and terminal B are LTE terminal, terminal C and terminal D are D2D terminal, 104 and 106 represent respectively communicating by letter between LTE terminal A and LTE terminal B and base station 102,108 represent the interference of D2D terminal to LTE signal, 110 represent the communication between D2D terminal, and 112 represent the interference of LTE terminal to D2D terminal.Due to LTE terminal, B is far away apart from base station 102, therefore can adopt larger transmitted power, now can be subject to larger interference with the D2D terminal D of LTE terminal B close together.
Therefore, how to realize the power control to D2D terminal, the phase mutual interference reducing between D2D terminal and LTE terminal becomes technical problem urgently to be resolved hurrily.
Summary of the invention
The present invention just based on above-mentioned technical problem one of at least, a kind of power control scheme for the direct-connected communication of terminal has been proposed, realize the transmitted power of D2D terminal has been controlled, reduce the relevant interference between D2D terminal and LTE terminal, improved the quality of D2D communication with cellular network communication.
In view of this, the present invention proposes a kind of Poewr control method for terminal direct communication, comprising: the coupling loss value of obtaining the upward signal between D2D terminal; Be worth residing scope according to described coupling loss, choose the power contorl parameters corresponding with described scope; The power contorl parameters corresponding with described scope is sent to described D2D terminal, sends the transmitted power of D2D signal for described D2D terminal according to described power contorl parameters configuration.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station, therefore, by being worth residing scope according to the coupling loss of the upward signal between D2D terminal and base station, choose corresponding power contorl parameters, make it possible to determine the distance between D2D terminal and base station according to the coupling loss value of the upward signal between D2D terminal and base station, and then time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power, and when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.Meanwhile, also avoided D2D terminal all to increase the energy consumption of D2D terminal with total power transmission D2D signal.
Wherein, coupling loss can comprise: path loss, shadow fading, permeation losses, antenna gain etc.Shadow fading can be according to user's position, by the shadow fading value of normal random function simulation obeys logarithm normal distribution; Antenna gain comprises fan antenna gain and bs antenna gain.
In technique scheme, preferably, the step of obtaining the coupling loss value of described upward signal is specially: measure receive described D2D terminal with maximum transmit power send D2D signal time received power, the coupling loss value using the difference of described maximum transmit power and described received power as described upward signal; Or receive the coupling loss value of the described upward signal that described D2D terminal sends.
In this technical scheme, D2D terminal determines that the step of the coupling loss value of upward signal comprises: path loss and/or the coupling loss of measuring the downstream signal of base station transmission, according to default adjusted value, and path loss and/or the coupling loss of the path loss of downstream signal and/or coupling loss calculating upward signal.
In technique scheme, preferably, the step that receives the coupling loss value of the described upward signal of described D2D terminal transmission is specially: receive the channel quality measurement information that described D2D terminal sends, determine the coupling loss value of described upward signal according to described channel quality measurement information.
In sum, in the application according to the coupling loss value of D2D terminal, method by compensating for path loss is carried out power control to D2D terminal, has avoided D2D terminal full power transmissions D2D signal and other signals are caused to interference, has reduced the interference of D2D terminal to other network terminals.Particularly, use different power contorl parameters according to different coupling loss scopes, guarantee that the D2D terminal that coupling loss is little obtains less coupling loss compensation, the D2D terminal that coupling loss is large obtains larger coupling loss compensation.
According to a second aspect of the invention, also propose a kind of power control system for the direct-connected communication of terminal, having comprised: acquiring unit, for obtaining the coupling loss value of the upward signal between D2D terminal; Choose unit, for being worth residing scope according to described coupling loss, choose the power contorl parameters corresponding with described scope; Transmitting element, for the power contorl parameters corresponding with described scope being sent to described D2D terminal, sends the transmitted power of D2D signal according to described power contorl parameters configuration for described D2D terminal.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station, therefore, by being worth residing scope according to the coupling loss of the upward signal between D2D terminal and base station, choose corresponding power contorl parameters, make it possible to determine the distance between D2D terminal and base station according to the coupling loss value of the upward signal between D2D terminal and base station, and then time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power, and when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.Meanwhile, also avoided D2D terminal all to increase the energy consumption of D2D terminal with total power transmission D2D signal.
Wherein, coupling loss can comprise: path loss, shadow fading, permeation losses, antenna gain etc.Shadow fading can be according to user's position, by the shadow fading value of normal random function simulation obeys logarithm normal distribution; Antenna gain comprises fan antenna gain and bs antenna gain.
In technique scheme, preferably, described acquiring unit comprises: measuring unit, for measure receive described D2D terminal with maximum transmit power send D2D signal time received power; Computing unit, for calculating the difference of described maximum transmit power and described received power, the coupling loss value using described difference as described upward signal; Or receiving element, for receiving the coupling loss value of the described upward signal that described D2D terminal sends.
In this technical scheme, D2D terminal determines that the mode of the coupling loss value of upward signal comprises: path loss and/or the coupling loss of measuring the downstream signal of base station transmission, according to default adjusted value, and path loss and/or the coupling loss of the path loss of downstream signal and/or coupling loss calculating upward signal.
In technique scheme, preferably, described receiving element specifically for: receive the channel quality measurement information that described D2D terminal sends, determine the coupling loss value of described upward signal according to described channel quality measurement information.
In sum, in the application according to the coupling loss value of D2D terminal, method by compensating for path loss is carried out power control to D2D terminal, has avoided D2D terminal full power transmissions D2D signal and other signals are caused to interference, has reduced the interference of D2D terminal to other network terminals.Particularly, use different power contorl parameters according to different coupling loss scopes, guarantee that the D2D terminal that coupling loss is little obtains less coupling loss compensation, the D2D terminal that coupling loss is large obtains larger coupling loss compensation.
According to a third aspect of the invention we, also propose a kind of Poewr control method for the direct-connected communication of terminal, having comprised: the geographical location information that receives D2D terminal to report; According to the residing region of described geographical location information, choose the power contorl parameters corresponding with described region; The power contorl parameters corresponding with described region is sent to described D2D terminal, sends the transmitted power of D2D signal for described D2D terminal according to the power contorl parameters configuration corresponding with described region.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station.Therefore, by according to the geographical location information of D2D terminal to report, choose the power contorl parameters corresponding with the residing region of geographical location information of D2D terminal, make time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power; And when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.
In technique scheme, preferably, before choosing the power contorl parameters corresponding with described region, also comprise: the fringe region of the coverage of described base station and described coverage is divided into multiple regions, according to the distance between each region and described base station in described multiple regions, the power contorl parameters corresponding to described each region is set.
By above technical scheme, base station range is divided into multiple regions according to the distance between region and base station, each region division different capacity control parameter.By the division of base station coverage area, can make D2D terminal in the time of certain regional activity, directly obtain power contorl parameters, and needn't carry out path loss test, when improving power control efficiency, also reduce energy consumption.
According to a forth aspect of the invention, also propose a kind of power control system for the direct-connected communication of terminal, having comprised: receiving element, for receiving the geographical location information of D2D terminal to report; Choose unit, for according to the residing region of described geographical location information, choose the power contorl parameters corresponding with described region; Transmitting element, for the power contorl parameters corresponding with described region being sent to described D2D terminal, sends the transmitted power of D2D signal according to the power contorl parameters configuration corresponding with described region for described D2D terminal.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station.Therefore, by according to the geographical location information of D2D terminal to report, choose the power contorl parameters corresponding with the residing region of geographical location information of D2D terminal, make time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power; And when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.
In technique scheme, preferably, also comprise: region division unit, for the fringe region of the coverage of described base station and described coverage is divided into multiple regions; Setting unit, for according to the distance between each region, described multiple regions and described base station, arranges the power contorl parameters corresponding to described each region.
By above technical scheme, base station range is divided into multiple regions according to the distance between region and base station, each region division different capacity control parameter.By the division of base station coverage area, can make D2D terminal in the time of certain regional activity, directly obtain power contorl parameters, and needn't carry out path loss test, when improving power control efficiency, also reduce energy consumption.
According to a fifth aspect of the invention, also propose a kind of base station, having comprised: the power control system for the direct-connected communication of terminal described in above-mentioned any one technical scheme.
By above technical scheme, realize the transmitted power of D2D terminal has been controlled, reduce the relevant interference between D2D terminal and LTE terminal, improve the quality of D2D communication with cellular network communication.
Brief description of the drawings
Fig. 1 shows the interference schematic diagram between current LTE terminal and D2D terminal;
Fig. 2 shows the schematic flow diagram of the Poewr control method for the direct-connected communication of terminal according to an embodiment of the invention;
Fig. 3 shows the schematic block diagram of the power control system for the direct-connected communication of terminal according to an embodiment of the invention;
Fig. 4 shows the schematic flow diagram of the Poewr control method for the direct-connected communication of terminal according to another embodiment of the invention;
Fig. 5 shows the schematic block diagram of the power control system for the direct-connected communication of terminal according to another embodiment of the invention.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 2 shows the schematic flow diagram of the Poewr control method for the direct-connected communication of terminal according to an embodiment of the invention.
As shown in Figure 2, the Poewr control method for the direct-connected communication of terminal according to an embodiment of the invention, comprising:
Step 202, obtains the coupling loss value of the upward signal between D2D terminal;
Step 204, is worth residing scope according to described coupling loss, chooses the power contorl parameters corresponding with described scope;
Step 206, will with described scope, the power contorl parameters of answering is sent to described D2D terminal, for described D2D terminal, according to described power contorl parameters, configuration sends the transmitted power of D2D signal.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station, therefore, by being worth residing scope according to the coupling loss of the upward signal between D2D terminal and base station, choose corresponding power contorl parameters, make it possible to determine the distance between D2D terminal and base station according to the coupling loss value of the upward signal between D2D terminal and base station, and then time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power, and when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.Meanwhile, also avoided D2D terminal all to increase the energy consumption of D2D terminal with total power transmission D2D signal.
Wherein, coupling loss can comprise: path loss, shadow fading, permeation losses, antenna gain etc.Shadow fading can be according to user's position, by the shadow fading value of normal random function simulation obeys logarithm normal distribution; Antenna gain comprises fan antenna gain and bs antenna gain.
In technique scheme, preferably, the step of obtaining the coupling loss value of described upward signal is specially: measure receive described D2D terminal with maximum transmit power send D2D signal time received power, the coupling loss value using the difference of described maximum transmit power and described received power as described upward signal; Or receive the coupling loss value of the described upward signal that described D2D terminal sends.
In this technical scheme, D2D terminal determines that the step of the coupling loss value of upward signal comprises: path loss and/or the coupling loss of measuring the downstream signal of base station transmission, according to default adjusted value, and path loss and/or the coupling loss of the path loss of downstream signal and/or coupling loss calculating upward signal.
In technique scheme, preferably, the step that receives the coupling loss value of the described upward signal of described D2D terminal transmission is specially: receive the channel quality measurement information that described D2D terminal sends, determine the coupling loss value of described upward signal according to described channel quality measurement information.
By above technical scheme, by measuring the coupling loss value of D2D terminal, or directly receive the coupling loss value of D2D terminal, determine that coupling loss is worth scope of living in.
In sum, in the application according to the coupling loss value of D2D terminal, method by compensating for path loss is carried out power control to D2D terminal, has avoided D2D terminal full power transmissions D2D signal and other signals are caused to interference, has reduced the interference of D2D terminal to other network terminals.Particularly, use different power contorl parameters according to different coupling loss scopes, guarantee that the D2D terminal that coupling loss is little obtains less coupling loss compensation, the D2D terminal that coupling loss is large obtains larger coupling loss compensation.
Fig. 3 shows the schematic block diagram of the power control system for the direct-connected communication of terminal according to an embodiment of the invention.
As shown in Figure 3, the power control system for the direct-connected communication of terminal according to an embodiment of the invention, comprising: acquiring unit 302, for obtaining the coupling loss value of the upward signal between D2D terminal; Choose unit 304, for being worth residing scope according to described coupling loss, choose the power contorl parameters corresponding with described scope; Transmitting element 306, for the power contorl parameters corresponding with described scope being sent to described D2D terminal, sends the transmitted power of D2D signal according to described power contorl parameters configuration for described D2D terminal.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station, therefore, by being worth residing scope according to the coupling loss of the upward signal between D2D terminal and base station, choose corresponding power contorl parameters, make it possible to determine the distance between D2D terminal and base station according to the coupling loss value of the upward signal between D2D terminal and base station, and then time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power, and when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.Meanwhile, also avoided D2D terminal all to increase the energy consumption of D2D terminal with total power transmission D2D signal.
Wherein, coupling loss can comprise: path loss, shadow fading, permeation losses, antenna gain etc.Shadow fading can be according to user's position, by the shadow fading value of normal random function simulation obeys logarithm normal distribution; Antenna gain comprises fan antenna gain and bs antenna gain.
In technique scheme, preferably, described acquiring unit 302 comprises: measuring unit 308, for measure receive described D2D terminal with maximum transmit power send D2D signal time received power; Computing unit 310, for calculating the difference of described maximum transmit power and described received power, the coupling loss value using described difference as described upward signal; Or receiving element 312, for receiving the coupling loss value of the described upward signal that described D2D terminal sends.
In this technical scheme, D2D terminal determines that the mode of the coupling loss value of upward signal comprises: path loss and/or the coupling loss of measuring the downstream signal of base station transmission, according to default adjusted value, and path loss and/or the coupling loss of the path loss of downstream signal and/or coupling loss calculating upward signal.
In technique scheme, preferably, described receiving element 212 specifically for: receive the channel quality measurement information that described D2D terminal sends, determine the coupling loss value of described upward signal according to described channel quality measurement information.
In sum, in the application according to the coupling loss value of D2D terminal, method by compensating for path loss is carried out power control to D2D terminal, has avoided D2D terminal full power transmissions D2D signal and other signals are caused to interference, has reduced the interference of D2D terminal to other network terminals.Particularly, use different power contorl parameters according to different coupling loss scopes, guarantee that the D2D terminal that coupling loss is little obtains less coupling loss compensation, the D2D terminal that coupling loss is large obtains larger coupling loss compensation.
Fig. 4 shows the schematic flow diagram of the Poewr control method for the direct-connected communication of terminal according to another embodiment of the invention.
As shown in Figure 4, the Poewr control method for the direct-connected communication of terminal according to another embodiment of the invention, comprising:
Step 402, the geographical location information of reception D2D terminal to report;
Step 404, according to the residing region of described geographical location information, chooses the power contorl parameters corresponding with described region;
Step 406, is sent to described D2D terminal by the power contorl parameters corresponding with described region, sends the transmitted power of D2D signal for described D2D terminal according to the power contorl parameters configuration corresponding with described region.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station.Therefore, by according to the geographical location information of D2D terminal to report, choose the power contorl parameters corresponding with the residing region of geographical location information of D2D terminal, make time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power; And when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.
In technique scheme, preferably, before choosing the power contorl parameters corresponding with described region, also comprise: the fringe region of the coverage of described base station and described coverage is divided into multiple regions, according to the distance between each region and described base station in described multiple regions, the power contorl parameters corresponding to described each region is set.
In this technical scheme, base station range is divided into multiple regions according to the distance between region and base station, each region division different capacity control parameter.By the division of base station coverage area, can make D2D terminal in the time of certain regional activity, directly obtain power contorl parameters, and needn't carry out path loss test, when improving power control efficiency, also reduce energy consumption.
Fig. 5 shows the schematic block diagram of the power control system for the direct-connected communication of terminal according to another embodiment of the invention.
As shown in Figure 5, the power control system for the direct-connected communication of terminal according to another embodiment of the invention, comprising: receiving element 502, for receiving the geographical location information of D2D terminal to report; Choose unit 504, for according to the residing region of described geographical location information, choose the power contorl parameters corresponding with described region; Transmitting element 506, for the power contorl parameters corresponding with described region being sent to described D2D terminal, sends the transmitted power of D2D signal according to the power contorl parameters configuration corresponding with described region for described D2D terminal.
In this technical scheme, because the coupling loss value of the upward signal between D2D terminal and base station is mainly to be determined by the relative position of D2D terminal and base station.Therefore, by according to the geographical location information of D2D terminal to report, choose the power contorl parameters corresponding with the residing region of geographical location information of D2D terminal, make time far away between D2D terminal and base station, can adopt larger loss balancing to D2D terminal, send with larger transmitted power, to avoid the nearer D2D terminal of distance L TE terminal to be subject to the larger interference of LTE terminal in the time receiving the D2D signal sending with smaller power; And when nearer between D2D terminal and base station, can adopt less loss balancing to D2D terminal, avoid D2D signal that D2D terminal sends in the time arriving base station power still compared with large and LTE signal is caused to larger interference.
In technique scheme, preferably, also comprise: region division unit 508, for the fringe region of the coverage of described base station and described coverage is divided into multiple regions; Setting unit 510, for according to the distance between each region, described multiple regions and described base station, arranges the power contorl parameters corresponding to described each region.
In this technical scheme, base station range is divided into multiple regions according to the distance between region and base station, each region division different capacity control parameter.By the division of base station coverage area, can make D2D terminal in the time of certain regional activity, directly obtain power contorl parameters, and needn't carry out path loss test, when improving power control efficiency, also reduce energy consumption.
On the basis of the power control scheme of the above-mentioned direct-connected communication of terminal, below while working in same community with D2D terminal and LTE terminal, be that example describes to the power consumption control scheme of D2D terminal.
In same community, if there is D2D terminal and LTE terminal simultaneously, because LTE terminal has been carried out open Loop Power control according to path loss and antenna gain etc., send the interference to LTE terminal for fear of D2D terminal with total power, the interference for fear of LTE terminal, D2D terminal being caused, need to carry out power control to D2D terminal simultaneously.
According to technical scheme of the present invention, the method of D2D terminal being carried out to power control comprises: obtain D2D terminal and arrive coupling loss value corresponding to the feedback information of coupling loss of base station or its present position and process, calculate the corresponding path loss of D2D terminal and antenna gain equivalence, the D2D terminal of coupling loss value in more among a small circle used a set of power contorl parameters, the user who exceedes this scope uses another set of power contorl parameters, and formula is as follows:
Concrete method is as follows:
One, the transmit power initialization of D2D terminal is maximum.
The received power of the D2D signal that the D2D terminal two, receiving according to base station sends, the coupling loss of calculating D2D terminal to base station.Wherein, coupling loss comprises following components:
(1) path loss, is mainly determined by the distance of D2D terminal to base station;
(2) shadow fading, can be according to user's position, by the shadow fading value of normal random function simulation obeys logarithm normal distribution;
(3) permeation losses is whether indoor or outdoor decision has infiltration decline according to user's position;
(4) antenna gain, fan antenna gain and bs antenna gain two parts.
Three, dividing logic regions.
Table 1
According to performance evaluation, as a kind of preferred embodiment, two groups of power contorl parameters can be set, be respectively set1 and set2.Wherein adopt set2 more to path loss balancing, corresponding D2D terminal transmit power is larger, is suitable for the D2D terminal of outer ring, community, and set1 is less to path loss balancing, less to base station interference, is suitable for the D2D terminal of community inner ring.
Four, calculate user's transmitting power according to power dominated formulate.
With the power dominated formulate according to above and the P0 and the Alpha value that set, division logical place calculates user's transmitting power.
By technique scheme, when control D2D user disturbs LTE user, also can reduce the impact of LTE user on D2D communication quality.
More than be described with reference to the accompanying drawings technical scheme of the present invention, the present invention proposes a kind of power control scheme for the direct-connected communication of terminal, realize the transmitted power of D2D terminal has been controlled, reduce the relevant interference between D2D terminal and LTE terminal, improved the quality of D2D communication with cellular network communication.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. for a Poewr control method for the direct-connected communication of terminal, for base station, it is characterized in that, comprising:
Obtain the coupling loss value of the upward signal between D2D terminal;
Be worth residing scope according to described coupling loss, choose the power contorl parameters corresponding with described scope;
The power contorl parameters corresponding with described scope is sent to described D2D terminal, sends the transmitted power of D2D signal for described D2D terminal according to described power contorl parameters configuration.
2. the Poewr control method for the direct-connected communication of terminal according to claim 1, is characterized in that, the step of obtaining the coupling loss value of described upward signal is specially:
Measurement receive described D2D terminal with maximum transmit power send D2D signal time received power, the coupling loss value using the difference of described maximum transmit power and described received power as described upward signal; Or
Receive the coupling loss value of the described upward signal of described D2D terminal transmission.
3. the Poewr control method for the direct-connected communication of terminal according to claim 2, is characterized in that, the step that receives the coupling loss value of the described upward signal of described D2D terminal transmission is specially:
Receive the channel quality measurement information that described D2D terminal sends, determine the coupling loss value of described upward signal according to described channel quality measurement information.
4. for a power control system for the direct-connected communication of terminal, for base station, it is characterized in that, comprising:
Acquiring unit, for obtaining the coupling loss value of the upward signal between D2D terminal;
Choose unit, for being worth residing scope according to described coupling loss, choose the power contorl parameters corresponding with described scope;
Transmitting element, for the power contorl parameters corresponding with described scope being sent to described D2D terminal, sends the transmitted power of D2D signal according to described power contorl parameters configuration for described D2D terminal.
5. the power control system for the direct-connected communication of terminal according to claim 4, is characterized in that, described acquiring unit comprises:
Measuring unit, for measure receive described D2D terminal with maximum transmit power send D2D signal time received power;
Computing unit, for calculating the difference of described maximum transmit power and described received power, the coupling loss value using described difference as described upward signal; Or
Receiving element, for receiving the coupling loss value of the described upward signal that described D2D terminal sends.
6. the power control system for the direct-connected communication of terminal according to claim 5, is characterized in that, described receiving element specifically for:
Receive the channel quality measurement information that described D2D terminal sends, determine the coupling loss value of described upward signal according to described channel quality measurement information.
7. for a Poewr control method for the direct-connected communication of terminal, for base station, it is characterized in that, comprising:
Receive the geographical location information of D2D terminal to report;
According to the residing region of described geographical location information, choose the power contorl parameters corresponding with described region;
The power contorl parameters corresponding with described region is sent to described D2D terminal, sends the transmitted power of D2D signal for described D2D terminal according to the power contorl parameters configuration corresponding with described region.
8. the Poewr control method for the direct-connected communication of terminal according to claim 7, is characterized in that, before choosing the power contorl parameters corresponding with described region, also comprises:
The fringe region of the coverage of described base station and described coverage is divided into multiple regions, according to the distance between each region and described base station in described multiple regions, the power contorl parameters corresponding to described each region is set.
9. for a power control system for the direct-connected communication of terminal, for base station, it is characterized in that, comprising:
Receiving element, for receiving the geographical location information of D2D terminal to report;
Choose unit, for according to the residing region of described geographical location information, choose the power contorl parameters corresponding with described region;
Transmitting element, for the power contorl parameters corresponding with described region being sent to described D2D terminal, sends the transmitted power of D2D signal according to the power contorl parameters configuration corresponding with described region for described D2D terminal.
10. the power control system for the direct-connected communication of terminal according to claim 9, is characterized in that, also comprises:
Region division unit, for being divided into multiple regions by the fringe region of the coverage of described base station and described coverage;
Setting unit, for according to the distance between each region, described multiple regions and described base station, arranges the power contorl parameters corresponding to described each region.
11. 1 kinds of base stations, is characterized in that, comprising: as claim 4 to 6, and claim 8 with described in any one in 9 for the direct-connected power control system of communicating by letter of terminal.
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Application publication date: 20141022 |