CN102821391B - Distance ratio based D2D (dimension to dimension) link spectrum allocation method - Google Patents
Distance ratio based D2D (dimension to dimension) link spectrum allocation method Download PDFInfo
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- CN102821391B CN102821391B CN201210340306.2A CN201210340306A CN102821391B CN 102821391 B CN102821391 B CN 102821391B CN 201210340306 A CN201210340306 A CN 201210340306A CN 102821391 B CN102821391 B CN 102821391B
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- base station
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Abstract
The invention discloses a distance ratio based D2D (dimension to dimension) link spectrum allocation method, belonging to the technical field of wireless communication. The method disclosed by the invention is implemented through selecting a D2D link which carries out communication by using a cell uplink in a cell, firstly selecting a base station user according with distance-ratio conditions in the cell, and sharing the spectrum resources of the base station user with the D2D link; and if the spectrum can not be shared, separately allocating a spectrum to the D2D link. Through the method, the interference problem in a D2D system is solved, thereby obtaining the capacity enhancement and ensuring the reliable D2D communication; and meanwhile, the spectrum selection criteria of D2D links is greatly simplified, thereby helping a base station to rapidly complete the spectrum allocation of D2D links.
Description
Technical field
The invention belongs to wireless communication technology field, specifically, relate to a kind of based on distance than D2D link spectral distribution method.
Background technology
D2D communication is under a kind of control of system, directly carried out the new technology communicated by reuse pattern resource between permission terminal, it has multiple advantage: can increase frequency spectrum efficiency of cellular communication system, improve momentary rate, reduce terminal transmit power, solve the problem of wireless communication system frequency spectrum resource scarcity to a certain extent.D2D reuses cell spectrum resource, and transmit data each other by a link, base station can control the Resourse Distribute of base station user and D2D user.
But be how to carry out interference coordination to avoid producing harmful interference to cellular network in a subject matter of the D2D system of cellular network, obtain the lifting of D2D power system capacity, or ensure that reliable D2D communicates.
Summary of the invention
The object of the invention is to solve the interference problem in D2D system, thus obtain capacity boost, ensure that reliable D2D communicates, provide a kind of based on distance than D2D link spectral distribution method.
To achieve these goals, the technical solution used in the present invention is as follows:
Based on distance than D2D link spectral distribution method, by the following method realize:
A () selects a D2D link in a community, this D2D link utilization cell uplink communicates;
B () selects qualified base station user in community as follows:
(b1) threshold value is set
, make:
（1）
Wherein:
C
trepresent base station user, D
rrepresent reception user on D2D link and
, D
trepresent transmission user on D2D link and
, therefore
represent the available signal power receiving user,
represent the interference power of the base station user received;
(b2) obtained by (1) formula:
（2）
Select base station user according to (2) formula, the base station user that at least one meets (2) formula condition if select, then enter next step, otherwise be then its special frequency spectrum resource of this D2D link assignment, wherein B represents base station,
represent that base station user is to the distance receiving user,
represent the distance of base station user to base station,
represent the available signal power of base station user,
represent path loss index;
C () selects the communication spectrum of D2D link, its main implementation method is as follows:
(c1) judge after selecting the base station user satisfied condition whether each base station user is used alone a frequency spectrum resource, if at least one base station user is used alone a frequency spectrum, then get rid of with the base station user of other D2D link common spectrum, select the candidate base station satisfied condition, and enter next step, otherwise then for this D2D link provides its special frequency spectrum resource;
(c2) in calculated candidate base station user, each base station user receives the distance sum of user and the ratio to base station distance to two D2D
, wherein
for positive integer and
be not more than candidate base station number of users;
(c3) corresponding according to each candidate base station ratio, select and satisfy condition:
（3）
Base station user, the frequency spectrum of the base station user allowing this D2D link sharing choose.
Further, in described step (b1):
（4）
Simultaneously:
（5）
Wherein said
for path loss constant.
Further, the specific implementation step of described step (b2) is as follows:
(b2a) due to threshold value
for fixed value, therefore make
, then obtained by (5) formula:
（6）；
(b2b) establish on D2D link two to receive user to be respectively
with
, and described reception user sends user, is D2D user, so selects the base station user simultaneously meeting following two conditions
:
(I) this base station user
distance to D1 and the ratio of distances constant to base station
,
(II) this base station user simultaneously
distance to D2 and the ratio of distances constant to base station
.
In order to better realize the present invention, in described step (c2) base station user to the distance of this D2D user with to arrive base station distance ratio sum computing formula separately as follows:
（7）。
Compared with prior art, the present invention has following beneficial effect:
(1) the invention solves the interference problem in D2D link communication.First in order to ensure the proper communication between D2D inside, the present invention sets a threshold value
, select the base station user outside certain distance to cause interference to avoid D2D link to base station received signal; Secondly because D2D is two-way communication, D
rbe D
t, in order to ensure proper communication between D2D inside and outside, the distance that the base station user of application claims D2D receives user to each all will meet with the ratio of distances constant to base station
condition, not only implementation is simple for this distribution method like this, fully ensure that simultaneously and there will not be any interference between base station user, base station, reception user three, and what be convenient to communicate normally carries out.
(2) the present invention is in the first step realized, and described D2D link utilization cell uplink communicates, and what adopt due to up link like this is power control techniques, therefore can set the base station user power that base station receives identical, namely equal
, like this concerning a D2D link
for determined value, enormously simplify formula; Meanwhile, utilize cell uplink to communicate, D2D link can not cause interference to the Received signal strength of base station user, can achieve many things at one stroke like this.
(3) only need first select to meet in the present invention
the base station user of condition, then formula is passed through in qualified base station user
select
be worth maximum base station user, namely find out the base station user that its frequency spectrum is applicable to reusing, this implementation method greatly simplifies the choice criteria of D2D link spectral, is conducive to base station and completes the distribution of D2D link spectral fast.
(4) the present invention pays the utmost attention to the frequency of base station user, then after finding satisfactory base station user, then uses the frequency spectrum resource of this user; If when not finding the base station user meeting this condition, it can also be the special frequency spectrum resource of this D2D link assignment.Fully being used of cell spectrum being made by above method, distributing special frequency spectrum resource in time when not finding the base station user satisfied condition, effectively ensure that the trafficability of D2D link.
Accompanying drawing explanation
Fig. 1 is the cell pattern that in the present invention-embodiment, D2D link and cellular link coexist;
Fig. 2 is that in the present invention-embodiment, D2D shares uplink user frequency spectrum and the special spectrogram of D2D;
Fig. 3 uses time-multiplexed traffic diagram between D2D link in the present invention-embodiment;
Fig. 4 is the present invention-embodiment intermediate frequency spectrum allocation algorithm realization flow figure.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
Cell pattern as shown in Figure 1, has multiple base station user and multipair D2D link in this community.D2D communication link is introduced a cellular cell by us, after all users have reported position to base station, due to the lack of uniformity of uplink downlink traffic load, no matter D2D link uses the frequency spectrum of user or divides frequency spectrum separately, and we consider that D2D link utilization cell uplink communicates.
As shown in Figure 2, this D2D link can not cause interference to the Received signal strength of base station user, but can cause interference to base station received signal, and the transmitting power of restriction D2D link can be adopted to solve interference to base station user.
First the frequency spectrum resource of sharing base station user is selected.To note when selecting sharing base station user's frequency spectrum resource: can not select from oneself reception user too close to the frequency spectrum of base station user, avoid that user is received to D2D and produce larger interference.
Therefore in order to ensure the proper communication of D2D, we require D2D to receive the available signal power of user and the interfering signal power ratio of base station user is greater than a threshold value, if this threshold value is
, learnt by above-mentioned:
（1）
Wherein in (1) formula
represent that D2D receives the available signal power of user,
represent the interference power of the base station user received.
D2D receives the available signal power of user:
（4）
Wherein in (4) formula
represent path loss constant,
represent path loss index,
represent that base station user receives the distance of user to D2D,
represent the transmitting power of base station user.
And simultaneously:
（5）
(4) formula and (5) formula are substituted into (1) Shi Ke get:
（2）
Being expressed as (0,0) position, base station, is (x, y) by the positional representation of base station user, therefore receives the position of user for (a, b), represents as follows with coordinate:
（8）
Order
, we are up employing power control techniques while utilizing cell uplink frequency band.
When the base station user power received in base station is identical, namely this power equals
, like this for a D2D link, R value is steady state value, and wherein said R meets the minimum range ratio that D2D shares spectrum communication requirement.Therefore the meaning that (8) formula illustrates is: if base station user is greater than to the Distance geometry of D2D reception user to the ratio of base station distance
, that is:
（6）
The frequency spectrum of this base station user just can be selected to be used as D2D communication.
As shown in Figure 3, in order to ensure that D2D can carry out two-way communication, adopt time-multiplexed D2D to communicate, the transmission user of such D2D receives user, is D2D user, D
r=D
t, two of a pair D2D link users are expressed as by we
with
, so any one base station user
arrive
distance with to the ratio of distances constant of base station be
, all to meet:
（9）
（10）
So just meet the communicating requirement of setting.
If do not have base station user to meet the requirement of (9) formula and (10) formula simultaneously, then it is the special frequency spectrum resource of this D2D link assignment.
After meeting above-mentioned all requirements, determined the frequency spectrum resource of base station user by following algorithm:
If the base station met the demands has N number of, be respectively
, then judge each base station user whether with other D2D link common spectrum, if so, then no longer using its candidate base station user as this D2D link.Drawing after screening, alternatively can have K by base station user, be respectively
,
, we are called candidate base station user them.
If now
, then represent do not have satisfactory candidate base station, so we are the special frequency spectrum resource of this D2D link assignment.
If
, then this K candidate base station user is calculated respectively to the distance of this D2D user and to base station distance ratio separately.To K(
) individual candidate base station user, obtain:
（7）
Then the user meeting equation is obtained
:
（3）
Namely select to make
obtain that candidate base station user of maximum
, allow the frequency spectrum of this base station user of D2D link sharing.
User on the notice D2D link of last base station uses this frequency spectrum.
Like this, as shown in Figure 4, just this frequency spectrum distributing method is well achieved.
According to above-described embodiment, just well the present invention can be realized.
Claims (4)
1. based on distance than D2D link spectral distribution method, it is characterized in that, comprise the following steps:
A () selects a D2D link in a community, this D2D link utilization cell uplink communicates;
B () selects qualified base station user in community as follows:
(b1) threshold value is set
, make:
（1）
Wherein:
C
trepresent base station user, D
rrepresent reception user on D2D link and
, D
trepresent transmission user on D2D link and
, therefore
represent the available signal power receiving user,
represent the interference power of the base station user received;
(b2) obtained by (1) formula:
（2）
Select base station user according to (2) formula, the base station user that at least one meets (2) formula condition if select, then enter next step, otherwise be then its special frequency spectrum resource of this D2D link assignment, wherein B represents base station,
represent that base station user is to the distance receiving user,
represent the distance of base station user to base station,
represent the available signal power of base station user,
represent path loss index;
C () selects the communication spectrum of D2D link, its main implementation method is as follows:
(c1) judge after selecting the base station user satisfied condition whether each base station user is used alone a frequency spectrum resource, if at least one base station user is used alone a frequency spectrum, then get rid of with the base station user of other D2D link common spectrum, select the candidate base station satisfied condition, and enter next step, otherwise then for this D2D link provides its special frequency spectrum resource;
(c2) in calculated candidate base station user, each base station user receives the distance sum of user and the ratio to base station distance to two D2D
, wherein
for positive integer and
be not more than candidate base station number of users;
(c3) corresponding according to each candidate base station ratio, select and satisfy condition:
（3）
Base station user, the frequency spectrum of the base station user allowing this D2D link sharing choose.
2. according to claim 1 based on distance than D2D link spectral distribution method, it is characterized in that, in described step (b1):
（4）
Simultaneously:
（5）
Wherein said
for path loss constant.
3. according to claim 2 based on distance than D2D link spectral distribution method, it is characterized in that, the specific implementation step of described step (b2) is as follows:
(b2a) due to threshold value
for fixed value, therefore make
, then obtained by (5) formula:
（6）；
(b2b) establish on D2D link two to receive user to be respectively
with
, and described reception user sends user, is D2D user, so selects the base station user simultaneously meeting following two conditions
:
(I) this base station user
distance to D1 and the ratio of distances constant to base station
,
(II) this base station user simultaneously
distance to D2 and the ratio of distances constant to base station
.
4. according to claim 3 based on distance than D2D link spectral distribution method, it is characterized in that, in described step (c2) base station user to the distance of this D2D user with to arrive base station distance ratio sum computing formula separately as follows:
（7）。
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| CN107071905B (en) * | 2012-06-29 | 2020-11-03 | 华为技术有限公司 | Inter-device communication method, user equipment and base station |
| CN103916968A (en) * | 2013-01-04 | 2014-07-09 | 中国移动通信集团公司 | Resource distributing method and base station |
| CN103929755A (en) * | 2013-01-15 | 2014-07-16 | 华为技术有限公司 | Communication method and device |
| CN103415022A (en) * | 2013-08-12 | 2013-11-27 | 电子科技大学 | Method of D2D spectrum allocation controlled by base station |
| CN103796192B (en) * | 2014-01-28 | 2017-04-19 | 南京邮电大学 | Cross-layer optimization design method in single-source and single-terminal straight-through relay communication system |
| US11044646B2 (en) * | 2014-07-22 | 2021-06-22 | Sharp Kabushiki Kaisha | Terminal apparatus, base station apparatus, communication system, communication method, and integrated circuit |
| CN111294765B (en) * | 2019-01-04 | 2021-10-08 | 展讯通信（上海）有限公司 | Method and device for maintaining and triggering maintenance of data transmission link |
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| CN101296475A (en) * | 2007-04-29 | 2008-10-29 | 华为技术有限公司 | Resource allocation method of communication system and wireless network system |
| CN101986743A (en) * | 2010-10-27 | 2011-03-16 | 大连工业大学 | Method for solving flow telephone traffic problem in wireless communication |
| EP2521409A1 (en) * | 2011-05-06 | 2012-11-07 | Hitachi Ltd. | Base station, interference control method and radio communication system |
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|---|---|---|---|---|
| CN101296475A (en) * | 2007-04-29 | 2008-10-29 | 华为技术有限公司 | Resource allocation method of communication system and wireless network system |
| CN101986743A (en) * | 2010-10-27 | 2011-03-16 | 大连工业大学 | Method for solving flow telephone traffic problem in wireless communication |
| EP2521409A1 (en) * | 2011-05-06 | 2012-11-07 | Hitachi Ltd. | Base station, interference control method and radio communication system |
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