CN102438245B - Allying method for acknowledging radio communication alliance - Google Patents

Abstract

The invention discloses an allying method for acknowledging a radio communication alliance. The allying method comprises the following steps of: firstly putting forward an establishing method of a communication alliance model based on an RSSI (Received Signal Strength Indication) type cellular topology structure by introducing an alliance game idea, and taking throughput of a maximization system as a solving target of the communication alliance mode; and configuring a layered management mode of first-level base station management and second-level base station management through alliance by an acknowledgement node, and optimizing signaling cost of the system so that the acknowledging node can directly interact signaling with a leader of an alliance by less power without needing of executing signaling interaction with the base station at each time. By establishing a user service triggering mechanism, the throughput of the system is further increased.

Description

The method of forming an alliance of a kind of cognition wireless telecommunication alliance

Technical field

The present invention relates to the method for forming an alliance of a kind of cognition wireless telecommunication alliance, belong to the cognitive radio technology field.

Background technology

Along with making rapid progress of social development and science and technology and rapidly popularizing of Internet of Things, radio spectrum resources is but more and more nervous.Under this background, cognitive radio (Cognitive Radio, CR) technology is arisen at the historic moment, and the CR technology is by take full advantage of idle frequency spectrum resource on time and space, thereby can effectively alleviate or solve the situation of above-mentioned frequency spectrum resource anxiety.

The cognitive radio cognitive radio that is otherwise known as, it take flexibly, intelligence, reconfigurable be notable feature, pass through sensing external environment, and use artificial intelligence technology from the environment learning, on purpose change in real time some operating parameter (such as through-put power, carrier frequency and modulation technique etc.), make its internal state adapt to the statistics variations of the wireless signal received, thus realize any time, the high reliable communication in any place and to heterogeneous network environment limited radio spectrum resources utilize efficiently.The core concept of cognitive radio is exactly by the intelligent learning ability of frequency spectrum perception (Spectrum Sensing) and system, realizes dynamic frequency spectrum deployment (DSA:dynamic spectrum allocation) and frequency spectrum share (Spectrum Sharing).

Cognitive radio to radio flexibly spectrum pool a kind of mechanism is provided, this method can be expanded the usually available bandwidth of application.The appearance of cognitive radio concept has advanced the development of intelligent radio power technology in the personal mobile communication field.

In the research of seldom measuring of at present communication being formed an alliance, major part is the principle that the distance between the cognitive time user of Main Basis is used as judging whether to build alliance, preferentially the cognition of close together time user is included in an alliance, cognitive time far away often can not the considering of user distance adds in an alliance.But we but find, the cognition of distance-based time user builds alliance does not have the efficiency of considering cognition time user in the channel of this segment distance, such as: a cognition time user A Recognition distance time user B is than C more closely, A and B form alliances after judging by the criterion of forming an alliance, and not and C set up alliance, but actual conditions are likely channels between A and B, do not have the efficiency of transmission of the channel between A and C high (the transmission channel gain is greatly).For this reason, most of existing achievement in research is calculate the transmission loss and then determine whether to form an alliance by obtaining model (as Hata model or okumuma model etc.) and the corresponding parameter that this channel of description is suitable, although this can partly address the above problem, but but increased that channel model does not mate and the error that causes and the complexity of algorithm, this communication that time complexity is had higher requirements form an alliance a large drawback beyond doubt.

Summary of the invention

Technical problem to be solved by this invention is to distribute for current fixed frequency spectrum the frequency spectrum resource contradiction in short supply of bringing, the method of forming an alliance of a kind of cognition wireless telecommunication alliance is provided, optimize the signaling consumption of system, made cognitive nodes can use less power directly and the mutual signaling of leader and do not need at every turn all with base station, to carry out Signalling exchange.The mechanism triggered by setting up customer service, the throughput of system is further improved.

The present invention adopts following technical scheme for solving the problems of the technologies described above:

The method of forming an alliance of a kind of cognition wireless telecommunication alliance comprises the following steps:

Steps A, point centered by a certain base station system, obtain the cognition time user who meets the following condition of forming an alliance:

1. the average of the RSSI that cognitive time user sends

meet:

2. the fluctuation variances sigma of the RSSI that cognitive time user sends ²in the scope allowed in base station system;

Wherein,

for the minimum value of system according to the received signal strength indicator average

the range size parameter of forming an alliance that the selected communication of self adaptation is formed an alliance, the threshold value that ε is the system permissible error, n=2k, k is positive integer;

Step B, the set of establishing the cognition time user who satisfies condition when n gets different numerical value is M _n, for the different values of each n at M _n6n communication alliance set up in middle selection, and each communication alliance specifies a leader by the base station initialization, and leader's selection is carried out according to following two kinds of situations:

B-1, gathering M according to the different values of each n _nin, can find 6n the cognition time user who meets following polar coordinates condition, the leader of each communication alliance in this base station communication scope using this 6n cognitive time user; Described polar coordinates condition is:

(n=2k, m≤3n, n≤N); Wherein, n, k, m, N are positive integer;

Concrete leader's the process of looking for is:

B-1-1, a cognition time user A in selected set M arbitrarily; Cognitive user A again selective reception to energy detection value be about

cognition time user B, now ought have a plurality of cognitions time user to meet this condition, select to approach most cognition time user that base station system value ε requires as cognitive time user B;

B-1-2, cognitive user B again selective reception to energy detection value be

cognition time user C, when there being a plurality of cognitions time user to meet this condition, select to approach most cognition time user that base station system value ε requires as cognitive time user C;

B-1-3, repeat above-mentioned steps B-1-1 to B-1-2, until find 6n cognitive time user;

B-1-4 does not have corresponding node near the position of above-mentioned polar coordinates R, reduces cognitive time user is reached

the requirement of threshold value is with more optional node around obtaining; So still do not find optional node to stop at looking for of this node annex, enter step B-2;

B-2, gathering M according to the different values of each n _nin, can not find 6n cognitive user, select all cognitions time user node of finding temporarily as the leader of each communication alliance, between two leaders

value is less than the system communication requirement, and wherein any one cognitive time user is as leader's right in cancellation, and concrete operational order is responsible for decision-making by the base station end and is sent;

Step C, the leader of each alliance selects member in the alliance of this alliance: the leader of each alliance finds according to following condition the cognition time user who meets the condition of forming an alliance respectively, and the described condition of forming an alliance is:

3. the average of the RSSI that cognitive time user sends

meet:

4. the fluctuation variances sigma of the RSSI that cognitive time user sends ²in the scope allowed in base station system.

Further, the method for forming an alliance of a kind of cognition wireless telecommunication of the present invention alliance, add the lower limit of the cognition time user RSSI average of the alliance that communicates by letter

computational methods be:

${\stackrel{\&OverBar;}{\mathrm{RSSI}}}_{\min }=\frac{1}{24576}{Q}^{-1}{\left(\frac{1-\sqrt{1-P_{K\max }}}{2(1-\frac{1}{\sqrt{K}})}\right)}^2\&CenterDot;(K-1)\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="110905190648.png"\; state="\{\{state\}\}">N</figure-callout>}}_0\&CenterDot;B\&CenterDot;{\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}^2$

P wherein _kmaxfor the maximum error probability of the K QAM of unit communication service tolerance, N ₀for single-side belt environment thermal noise power spectrum density, B is signal transmission bandwidth (Hz),

for the average channel noise power, Q represents the Q function table.

The present invention adopts above technical scheme compared with prior art, has following technique effect:

1, the present invention is incorporated into the cellular network framework of GSM in design after conversion, the class honeycomb fashion topological structure detected based on the RSSI energy value has been proposed, it is different from the traditional framework of geographical position scope as cell size selection principle of usining, it is the main basis for estimation using the size of RSSI energy value as cell size, solve current distance-based the produced deficiency of forming an alliance, and obtaining the RSSI value does not need to increase larger amount of calculation and extra hardware, application cost is lower.

2, in the present invention, cognitive nodes is set up the multi-zone supervision pattern of one-level BTS management, secondary leader management by forming an alliance, optimize the signaling consumption of system, made cognitive nodes can use less power directly and the mutual signaling of leader and do not need time time and Signalling exchange is carried out in base station.The mechanism triggered by setting up customer service, the throughput of system is further improved.

The accompanying drawing explanation

Fig. 1 is the cognition network user scene topology schematic diagram of forming an alliance.

Fig. 2 is the present invention's form an alliance flow chart of process of alliance of communicating by letter.

Fig. 3 is that cognitive user is respectively in nonalignment, only the throughput of system in situation of forming an alliance is schemed over time.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

As shown in Figure 1, in the topological structure conceptual design of forming an alliance in communication, the present invention is incorporated into the cellular network framework of GSM in design after conversion, (the Received Signal Strength Indication based on RSSI has been proposed, received signal strength indicator) the class honeycomb fashion topological structure that energy value detects, it is different from traditional usings the geographical position scope as the framework of cell size selection principle, but the basis for estimation of mainly forming an alliance using the size of RSSI energy value as cell size.This criterion can solve current distance-based the produced deficiency of forming an alliance, and obtaining the RSSI value does not need to increase larger amount of calculation and extra hardware, and application cost is lower.

RSSI is the index of base station (BS) or leader's side.The present invention selects 4QAM (4Quadrature Amplitude Modulation, binary orthogonal Modulation and Amplitude Modulation) as the channel coding method of communicating by letter between cognitive time user.

The error probability of the QAM of K unit is:

$P_K=1-{(1-P_{\sqrt{K}})}^2---\left(1\right)$

Wherein, $P_{\sqrt{K}}=2(1-\frac{1}{\sqrt{K}})Q\left(\sqrt{\frac{3}{K-1}\frac{E_b}{N_0}}\right)---\left(2\right)$

$\frac{{\mathrm{<figure-callout\; id="0"\; label="E\; b\; N"\; filenames="110905190648.png"\; state="\{\{state\}\}">E</figure-callout>}}_b}{N_{}}=\frac{{\mathrm{<figure-callout\; id="0"\; label="P\; s\; N"\; filenames="110905190648.png"\; state="\{\{state\}\}">P</figure-callout>}}_s}{N_{}}=\frac{\stackrel{\&OverBar;}{\mathrm{RSSI}}\&CenterDot;8192}{{\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}^2}---\left(3\right)$

Wherein B is signal transmission bandwidth (Hz), P _sfor transmitted signal power, for average channel noise power, N ₀for single-side belt environment thermal noise power spectrum density, E _brepresentative sends the energy of a bit, and the numeral 8192 in formula (3) represents samples 8192 each second.

Meeting under the condition that different business requires the error rate, can be in the hope of in the situation that the energy value of the needed receiving terminal of this channel particular Gaussian noise, thus determine the energy lower limit of RSSI as follows:

Suppose that the patient maximum bit error rate of certain business is P _kmax, by above-mentioned formula (1), (2), (3), can try to achieve the lower limit of RSSI energy

for:

${\stackrel{\&OverBar;}{\mathrm{RSSI}}}_{\min }=\frac{1}{24576}{Q}^{-1}{\left(\frac{1-\sqrt{1-P_{K\max }}}{2(1-\frac{1}{\sqrt{K}})}\right)}^2\&CenterDot;(K-1)\&CenterDot;{\mathrm{<figure-callout\; id="0"\; label="N"\; filenames="110905190648.png"\; state="\{\{state\}\}">N</figure-callout>}}_0\&CenterDot;B\&CenterDot;{\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}^2---\left(4\right)$

By system parameters: N ₀=4.1 * 10 ^-21w/Hz, K=4, B=1 _mHzbring (3) formula into, Q (X) function table by inquiring about large X value, can obtain

next, consider life-span service time of end cell and, on the interference of surrounding environment and the impact of human body, we are decided to be 50mW by the maximum power of terminal, and we obtain thus

In the Topology Structure Design of forming an alliance in communication, cellular network by the GSM framework of our innovation is incorporated in design after conversion, the class honeycomb fashion topological structure detected based on the RSSI energy value has been proposed, it is different from traditional usings the geographical position scope as the framework of cell size selection principle, and it is the main basis for estimation using the size of RSSI energy value as cell size.Reach the lower limit of the RSSI value obtained under the prerequisite of corresponding requirements by front signal to noise ratio and error rate after the communication that meets is formed an alliance

will

the cognition that analogy becomes the cellular cell radius R to determine can to add this community time user, that is: in each class cellular cell, specify certain cognitive time user as the leader, if certain cognitive time user wants that the RSSI value that adds this alliance and pass to the leader is greater than the lower limit of RSSI value

and fluctuation variances sigma ²under the condition allowed in system, the leader allows it to enter alliance; If the RSSI value is less than the lower limit of RSSI value the leader does not allow it to add this alliance.Secondly, the topological structure of this alliance is to using cognition time user's straight line of outermost on the geographical position at the alliance place that cognitive time user forms to be connected as the border of the alliance of forming, and the shape of alliance is not fixed also to differ and is decided to be regular hexagon.This is also the place that is different from traditional GSM cellular network topological structure.In different geographic areas, base station according to class honeycomb fashion topological structure under the restriction of cognitive user's hardware platform (as power limited, power system capacity etc.) select to set up each communication alliance with the system optimal criterion, the leader coordinates user in alliance, zones of different is laid base station according to communication throughput and is controlled the alliance that respectively communicates by letter, working method between base station is mutually synchronization, by above framework, realizes complete geographical covering of network.

Shown in Fig. 2, main flow process of the present invention is specific as follows:

Point centered by a certain system base-station BS (cognitive time user administrative center), find the average that it receives the RSSI that cognitive time user sends

satisfy condition

(n=2k, k ∈ N ⁺) and the fluctuation variances sigma ²cognition under the condition allowed in system time user,

for the system basis

the range size parameter of forming an alliance that the selected communication of self adaptation is formed an alliance, the set of establishing the cognition time user who satisfies condition when n gets different numerical value is M _n, for the different values of each n at M _n6n communication alliance set up in middle selection, and each communication alliance first specifies a leader (later stage upgrades principle according to the leader and changed) by the base station initialization.

(1) if the number of set | 6 of M|, an any cognition time user A in selected set M, then A again selective reception to energy detection value be about

cognition time user B (if having a plurality of, select to approach most the cognition time user that system value requires), then B again selective reception to energy detection value be

cognition time user C ... can find like this 6 cognitions time user, N the communication member's of alliance of alliance (comprising the leader) polar coordinate representation form is:

$R=(n{\stackrel{\&OverBar;}{\mathrm{RSSI}}}_L,\frac{2\mathrm{m\&pi;}}{3n})$ (n＝2k，m≤3n，n≤N，k，m∈N ⁺) (4-7)

The base station end is selected the leader of these 6 cognitions time user as this alliance (cognitive community).If there is no corresponding node near corresponding position, reduce cognitive time user is reached

the requirement of threshold value ε is with more optional node around obtaining, if still do not find optional node stop at looking for of this node annex like this.Former thereby reality that cause is available thus | the situation of M|<6 is processed according to following the second situation.

(2) if. the number of set | M|<6, select should | M| cognitive inferior user node, temporarily as the leader of this alliance (cognitive community), done corresponding modify according to foundation and the discard rule of alliance, if between two leaders be worth greatlyr, according to alliance's game idea, cancel the right of one of them cognitive user as the leader, concrete operational order is responsible for decision-making by the base station end and is sent.

As shown in Figure 3, be that cognitive user is respectively in nonalignment, only the throughput of system in situation of forming an alliance is schemed over time.In figure, can it is evident that, the rear throughput of forming an alliance will be significantly higher than the throughput in nonaligned situation.

Claims (2)

1. the method for forming an alliance of a cognition wireless telecommunication alliance is characterized in that: comprise the following steps:

Steps A, point centered by a certain base station system, obtain the cognition time user who meets the following condition of forming an alliance:

1. the average of the RSSI that cognitive time user sends

meet:

2. the fluctuation variances sigma of the RSSI that cognitive time user sends ²in the scope allowed in base station system;

Wherein,

for the minimum value of system according to the received signal strength indicator average

the range size parameter of forming an alliance that the selected communication of self adaptation is formed an alliance, the threshold value that ε is the system permissible error, n=2k, k is positive integer;

Step B, the set of establishing the cognition time user who satisfies condition when n gets different numerical value is M _n, for the different values of each n at M _n6n communication alliance set up in middle selection, and each communication alliance specifies a leader by the base station initialization, and leader's selection is carried out according to following two kinds of situations:

B-1, gathering M according to the different values of each n _nin, can find 6n the cognition time user who meets following polar coordinates condition, the leader of each communication alliance in this base station communication scope using this 6n cognitive time user; Described polar coordinates condition is:

wherein, n=2k, m≤3n, n≤N, n, k, m, N are positive integer;

Concrete leader's the process of looking for is:

B-1-1, a cognition time user A in selected set M arbitrarily; Cognitive user A again selective reception to energy detection value be about 2

cognition time user B, now ought have a plurality of cognitions time user to meet this condition, select to approach most cognition time user that base station system value ε requires as cognitive time user B;

B-1-2, cognitive user B again selective reception to energy detection value be 2

cognition time user C, when there being a plurality of cognitions time user to meet this condition, select to approach most cognition time user that base station system value ε requires as cognitive time user C;

B-1-3, repeat above-mentioned steps B-1-1 to B-1-2, until find 6n cognitive time user;

B-1-4, while near the position of above-mentioned polar coordinates R, there is no corresponding node, reduce cognitive time user reached

the requirement of threshold value is with more optional node around obtaining; So still do not find optional node to stop at looking for of this node annex, enter step B-2;

B-2, gathering M according to the different values of each n _nin, can not find 6n cognitive user, select all cognitions time user node of finding temporarily as the leader of each communication alliance, between two leaders

value is less than the system communication requirement, and wherein any one cognitive time user is as leader's right in cancellation, and concrete operational order is responsible for decision-making by the base station end and is sent;

Step C, the leader of each alliance selects member in the alliance of this alliance: the leader of each alliance finds according to following condition the cognition time user who meets the condition of forming an alliance respectively, and the described condition of forming an alliance is:

3. the average of the RSSI that cognitive time user sends meet:

4. the fluctuation variances sigma of the RSSI that cognitive time user sends ²in the scope allowed in base station system.

2. the method for forming an alliance of a kind of cognition wireless telecommunication according to claim 1 alliance, is characterized in that: the minimum value of described received signal strength indicator average

computational methods be:

${\stackrel{\&OverBar;}{\mathrm{RSSI}}}_{\min }=\frac{1}{24576}{Q}^{-1}{\left(\frac{1-\sqrt{1-P_{K\max }}}{2(1-\frac{1}{\sqrt{K}})}\right)}^2\&CenterDot;(K-1)\&CenterDot;N_0\&CenterDot;B\&CenterDot;{\stackrel{\&OverBar;}{\mathrm{\&sigma;}}}^2$

Wherein, P _kmaxfor the maximum error probability of the K QAM of unit communication service tolerance, N ₀for single-side belt environment thermal noise power spectrum density, B is signal transmission bandwidth (Hz),

for the average channel noise power, Q represents the Q function table.

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