CN102438245A - Allying method for acknowledging radio communication alliance - Google Patents

Allying method for acknowledging radio communication alliance Download PDF

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CN102438245A
CN102438245A CN2011102609881A CN201110260988A CN102438245A CN 102438245 A CN102438245 A CN 102438245A CN 2011102609881 A CN2011102609881 A CN 2011102609881A CN 201110260988 A CN201110260988 A CN 201110260988A CN 102438245 A CN102438245 A CN 102438245A
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alliance
cognitive
time user
user
base station
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CN102438245B (en
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崔龙
杨震
田峰
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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 continuous development and the making rapid progress of science and technology and rapidly the popularizing of Internet of Things of society, radio spectrum resources is but more and more nervous.Under this background, and cognitive radio (Cognitive Radio, CR) technology is arisen at the historic moment, and the CR technology is through making full use of idle frequency spectrum resource on time and space, thereby can effectively alleviate or solve the nervous situation of above-mentioned frequency spectrum resource.
The cognitive radio intelligent radio that is otherwise known as; It with flexibly, intelligence, reconfigurable be notable feature; Through the perception external environment; And use artificial intelligence technology from environment, to learn; Some operating parameter of real time altering (such as through-put power, carrier frequency and modulation technique etc.) on purpose makes its internal state adapt to the statistics variations of the wireless signal that receives, thereby realizes any time, the high reliable communication in any place and heterogeneous network environment limited wireless frequency spectrum resource utilized efficiently.The core concept of cognitive radio is exactly the intelligence learning ability through 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 available bandwidth of usually using.The appearance of cognitive radio notion has advanced the development of intelligent radio power technology in the personal mobile communication field.
In the research of the very small amount of at present communication being formed an alliance; Major part is the main principle that is used as judging whether to build alliance according to the distance between the cognitive time user; Preferentially the cognitive time user with close together includes in the alliance, and often not will consider that cognitive time user distance is far away adds in the alliance.But we but find; Build alliance based on the inferior user of the cognition of distance and do not consider the efficient of cognitive time user in the channel of this segment distance; Such as: a cognition time user A is apart from cognitive time user B than C more closely; A and B form alliances after judging through the criterion of forming an alliance, and do not set up alliance with C, do not have the efficiency of transmission of the channel between A and C high (the transmission channel gain greatly) but actual conditions might be channels between A and B.For this reason; Most of existing achievement in research is to describe this channel proper model (like Hata model or okumuma model etc.) and relevant parameters and come the calculating channel loss and then determine whether to form an alliance through obtaining; Though this can partly address the above problem; But increased but that channel model does not match and the complexity of the sum of errors algorithm that causes, this communication that time complexity is had higher requirements form an alliance a big drawback beyond doubt.
Summary of the invention
Technical problem to be solved by this invention is to distribute the frequency spectrum resource contradiction of bringing in short supply to current fixed frequency spectrum; The method of forming an alliance of a kind of cognition wireless telecommunication alliance is provided; Optimized 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 to carry out Signalling exchange with the base station.Through setting up the mechanism that customer service triggers, 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 may further comprise the steps:
Steps A is a central point with a certain base station system, obtains the cognitive time user who satisfies the following condition of forming an alliance:
① sent to the user's cognitive times the mean RSSI
Figure BDA0000089145950000021
meet:
Figure BDA0000089145950000022
2. the fluctuation variances sigma of the RSSI that cognitive time user sends 2In the scope that base station system allows;
Wherein, The range size parameter of forming an alliance that
Figure BDA0000089145950000023
forms an alliance according to the selected communication of minimum value self adaptation that receives signal strength signal intensity indication average for system; ε is the threshold value of system's permissible error; N=2k, k are positive integer;
Step B, the set of establishing the cognitive time user who satisfies condition when n gets different numerical 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 accordings to following two kinds of situation and carries out:
B-1 is gathering M according to the different values of each n nIn, can find 6n the cognitive time user who satisfies following polar coordinates condition, then with the leader of this 6n cognitive time user as each communication alliance in this base station communication scope; Said polar coordinates condition is:
(n=2k; M≤3n, n≤N); Wherein, n, k, m, N are positive integer;
Then concrete leader's the process of looking for is:
B-1-1, a cognition time user A among the selected arbitrarily set M; Cognitive user A again selective reception to the cognitive time user B that energy detection value is about ; Meet this condition as a plurality of cognitions time user this moment, and the cognitive time user who then selects to require near base station system value ε is as cognitive time user B;
B-1-2; Cognitive user B be the cognitive time user C of energy detection value for
Figure BDA0000089145950000027
that arrive of selective reception again; Meet this condition as a plurality of cognitions time user, the cognitive time user who then selects to require near base station system value ε is as cognitive time user C;
B-1-3 repeats above-mentioned steps B-1-1 to B-1-2, until finding 6n cognitive time user;
B-1-4; Near the position of above-mentioned polar coordinates R, do not have corresponding nodes, then reduce cognitive user reached
Figure BDA0000089145950000028
threshold value requirement with more optional node around obtaining; So still do not find optional node then to stop at looking for of this node annex, get into step B-2;
B-2 is gathering M according to the different values of each n nIn, can not find 6n cognitive user, all cognitive time user nodes of then selecting to find are temporarily as the leader of each communication alliance, between two leaders
Figure BDA0000089145950000031
Value is less than the system communication requirement, and then the wherein any cognition of cancellation time user is as leader's right, and concrete operational order is responsible for decision-making by base station end and is sent;
Step C, each leader of alliance select member in the alliance of this alliance: each leader of alliance seeks the cognitive time user who satisfies the condition of forming an alliance according to following condition respectively, and the said condition of forming an alliance is:
③ sent to the user's cognitive times the mean RSSI meet:
Figure BDA0000089145950000033
4. the fluctuation variances sigma of the RSSI that cognitive time user sends 2In the scope that base station system allows.
Further; The method of forming an alliance of a kind of cognition wireless telecommunication of the present invention alliance, the computational methods of lower limit
Figure BDA0000089145950000034
that add the cognitive time user RSSI average of communication alliance are:
RSSI ‾ min = 1 24576 Q - 1 ( 1 - 1 - P K max 2 ( 1 - 1 K ) ) 2 · ( K - 1 ) · N 0 · B · σ ‾ 2
P wherein KmaxBe the maximum error probability of the K QAM of unit communication service tolerance, N 0Be monolateral band border thermal noise power spectrum density, B is transmission signals bandwidth (Hz),
Figure BDA0000089145950000036
Be 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 the design through after the conversion; Proposed the class honeycomb fashion topological structure that detects based on the RSSI energy value, it is different from traditional with the framework of geographical position scope as cell size selection principle, and it is with the size of the RSSI energy value main basis for estimation as cell size; Solve the deficiency of forming an alliance and being produced based on distance at present; And obtaining the RSSI value need not increase bigger amount of calculation and additional hardware, and 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 through forming an alliance; Optimized the signaling consumption of system, made cognitive nodes can use less power directly not need time time and Signalling exchange is carried out in the base station with the mutual signaling of leader.Through setting up the mechanism that customer service triggers, the throughput of system is further improved.
Description of drawings
Fig. 1 is the cognition network user scene topology sketch map 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 of forming an alliance under the situation is schemed over time.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is done further detailed description:
As shown in Figure 1; In the topological structure conceptual design that communication is formed an alliance; The present invention is incorporated into the cellular network framework of GSM in the design through after the conversion; (the Received Signal Strength Indication based on RSSI has been proposed; Receive the signal strength signal intensity indication) the class honeycomb fashion topological structure that detects of energy value, it is different from traditional with the framework of geographical position scope as cell size selection principle, but with the size of the RSSI energy value basis for estimation of mainly forming an alliance as cell size.This criterion can solve the deficiency of forming an alliance and being produced based on distance at present, and obtaining the RSSI value need not increase bigger amount of calculation and additional 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 K ) 2 - - - ( 1 )
Wherein, P K = 2 ( 1 - 1 K ) Q ( 3 K - 1 E b N 0 ) - - - ( 2 )
E b N 0 = P s N 0 · B = RSSI ‾ · 8192 σ ‾ 2 - - - ( 3 )
Wherein B is transmission signals bandwidth (Hz), P sBe the transmission signal power,
Figure BDA0000089145950000044
Be average channel noise power, N 0Be monolateral band border thermal noise power spectrum density, E bThe energy of a bit is sent in representative, and the numeral 8192 in the formula (3) is represented and sampled 8192 each second.
Satisfying under the condition of different business to error rate requirement; Can be in the hope of the energy value of needed receiving terminal under the situation of this channel particular gaussian noise, thus the energy lower limit
Figure BDA0000089145950000045
of confirming RSSI is as follows:
Suppose that certain professional patient maximum bit error rate is P Kmax, then can try to achieve the lower limit of RSSI energy through above-mentioned formula (1), (2), (3)
Figure BDA0000089145950000046
For:
RSSI ‾ min = 1 24576 Q - 1 ( 1 - 1 - P K max 2 ( 1 - 1 K ) ) 2 · ( K - 1 ) · N 0 · B · σ ‾ 2 - - - ( 4 )
With system parameters: N 0=4.1 * 10 -21W/Hz, K=4, B=1 MHzBring (3) formula into, Q (X) function table through inquiring about big X value can get
Figure BDA0000089145950000048
Next takes all factors into consideration life-span service time of end cell and to the interference of surrounding environment and the influence of human body, we are decided to be 50mW with the maximum power at terminal, and we obtain thus
In the topological structure design that communication is formed an alliance; We are incorporated in the design through after the conversion by the cellular network framework with GSM of innovation; Class honeycomb fashion topological structure based on the detection of RSSI energy value has been proposed; It is different from traditional with the framework of geographical position scope as cell size selection principle, and it is with the size of the RSSI energy value main basis for estimation as cell size.Reach the lower limit of the RSSI value that obtains under the prerequisite of corresponding requirements through the front in form an alliance back signal to noise ratio and the error rate of the communication of satisfying
Figure BDA0000089145950000051
Will
Figure BDA0000089145950000052
Analogy becomes the cellular cell radius R to confirm to add the cognitive time user of this sub-district; That is: in each type cellular cell, specify certain cognitive time user as the leader, if the RSSI value that certain cognitive time user wants to add this alliance and pass to the leader is greater than the lower limit of RSSI value
Figure BDA0000089145950000053
And fluctuation variances sigma 2Under the condition that system allows, then the leader allows it to go into alliance; If the RSSI value is less than the lower limit of RSSI value
Figure BDA0000089145950000054
Then the leader does not allow it to add this alliance.Secondly, the topological structure of this alliance is that cognitive time user's straight line of outermost links to each other as the border of the alliance of forming on the geographical position at the alliance place of forming with cognitive time user, and the shape of alliance is not fixed also to differ and is decided to be regular hexagon.This also is the place that is different from traditional G SM cellular network topological structure.In different geographic areas; The base station selects to set up each communication alliance according to class honeycomb fashion topological structure (like power limited, power system capacity etc.) under the qualification of cognitive user's hardware platform with the system optimal criterion; The leader coordinates user in the alliance; Zones of different is laid the base stations control alliance that respectively communicates by letter according to communication throughput, and the working method between the base station is a mutually synchronization, realizes complete geographical covering of network through above framework.
In conjunction with shown in Figure 2, main flow process of the present invention is specific as follows:
With a certain system base-station BS (cognitive time user administrative center) be central point, seeks the average that it receives the RSSI that cognitive inferior user sends
Figure BDA0000089145950000055
Satisfy condition
Figure BDA0000089145950000056
(n=2k, k ∈ N +) and the fluctuation variances sigma 2Cognitive time user under the condition that system allows,
Figure BDA0000089145950000057
Be system's basis
Figure BDA0000089145950000058
The range size parameter of forming an alliance that the selected communication of self adaptation is formed an alliance, the set of establishing the cognitive time user who satisfies condition when n gets different numerical 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 (later stage upgrades principle according to the leader and changes) by the base station initialization earlier.
(1) if the number of set | 6 of M|; Cognition time user A among the then selected arbitrarily set M; Then A again selective reception to energy detection value is about
Figure BDA0000089145950000059
cognitive time user B (if having a plurality of; Then selection is near the inferior user of the cognition of system value requirement); The B cognitive time user C of the energy detection value that arrives of selective reception for
Figure BDA00000891459500000510
more then ... Can find 6 cognitions time user like this, N the communication member's of alliance of alliance (comprising the leader) polar coordinate representation form is:
R = ( n RSSI ‾ L , 2 mπ 3 n ) (n＝2k，m≤3n，n≤N，k，m∈N +) (4-7)
Base station end is selected the leader of these 6 cognitions time user as this alliance (cognitive sub-district).If near corresponding position, do not have corresponding nodes; Then reduce cognitive user reached
Figure BDA00000891459500000512
threshold value ε requirement with more optional node around obtaining, if still do not find optional node like this then stop at looking for of this node annex.Former thus thus cause actual available | the situation of M|＜6 is handled according to following second kind of situation.
(2) if. the set number | M|＜6; Then select should | M| cognitive inferior user node is temporarily as the leader of this alliance (cognitive sub-district); Foundation and deletion criterion according to alliance are done modify; If
Figure BDA0000089145950000061
value is bigger between two leaders; Then according to the right of one of them cognitive time user of alliance's game idea cancellation as the leader, concrete operational order is responsible for decision-making by base station end and is sent.
As shown in Figure 3, be that cognitive user is respectively in nonalignment, only the throughput of system of forming an alliance under the situation is schemed over time.By it is evident that among the figure, the back throughput of forming an alliance will be higher than the throughput under the nonaligned situation significantly.

Claims (2)

1. the method for forming an alliance of a cognition wireless telecommunication alliance is characterized in that: may further comprise the steps:
Steps A is a central point with a certain base station system, obtains the cognitive time user who satisfies the following condition of forming an alliance:
① sent to the user's cognitive times the mean RSSI
Figure FDA0000089145940000011
meet:
Figure FDA0000089145940000012
2. the fluctuation variances sigma of the RSSI that cognitive time user sends 2In the scope that base station system allows;
Wherein, The range size parameter of forming an alliance that
Figure FDA0000089145940000013
forms an alliance according to the selected communication of minimum value
Figure FDA0000089145940000014
self adaptation that receives signal strength signal intensity indication average for system; ε is the threshold value of system's permissible error; N=2k, k are positive integer;
Step B, the set of establishing the cognitive time user who satisfies condition when n gets different numerical 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 accordings to following two kinds of situation and carries out:
B-1 is gathering M according to the different values of each n nIn, can find 6n the cognitive time user who satisfies following polar coordinates condition, then with the leader of this 6n cognitive time user as each communication alliance in this base station communication scope; Said polar coordinates condition is:
Figure FDA0000089145940000015
(n=2k; M≤3n, n≤N); Wherein, n, k, m, N are positive integer;
Then concrete leader's the process of looking for is:
B-1-1, a cognition time user A among the selected arbitrarily set M; Cognitive user A again selective reception to the cognitive time user B that energy detection value is about
Figure FDA0000089145940000016
; Meet this condition as a plurality of cognitions time user this moment, and the cognitive time user who then selects to require near base station system value ε is as cognitive time user B;
B-1-2; Cognitive user B be the cognitive time user C of energy detection value for
Figure FDA0000089145940000017
that arrive of selective reception again; Meet this condition as a plurality of cognitions time user, the cognitive time user who then selects to require near base station system value ε is as cognitive time user C;
B-1-3 repeats above-mentioned steps B-1-1 to B-1-2, until finding 6n cognitive time user;
B-1-4; When near the position of above-mentioned polar coordinates R, not having corresponding nodes, then reduce cognitive user reached
Figure FDA0000089145940000018
threshold value requirement with more optional node around obtaining; So still do not find optional node then to stop at looking for of this node annex, get into step B-2;
B-2 is gathering M according to the different values of each n nIn, can not find 6n cognitive user, all cognitive time user nodes of then selecting to find are temporarily as the leader of each communication alliance, between two leaders
Figure FDA0000089145940000019
Value is less than the system communication requirement, and then the wherein any cognition of cancellation time user is as leader's right, and concrete operational order is responsible for decision-making by base station end and is sent;
Step C, each leader of alliance select member in the alliance of this alliance: each leader of alliance seeks the cognitive time user who satisfies the condition of forming an alliance according to following condition respectively, and the said condition of forming an alliance is:
③ sent to the user's cognitive times the mean RSSI meet:
Figure FDA0000089145940000022
4. the fluctuation variances sigma of the RSSI that cognitive time user sends 2In the scope that base station system allows.
2. the method for forming an alliance of a kind of cognition wireless telecommunication according to claim 1 alliance is characterized in that: the computational methods of the lower limit
Figure FDA0000089145940000023
of the cognitive time user RSSI average of said adding communication alliance are:
RSSI ‾ min = 1 24576 Q - 1 ( 1 - 1 - P K max 2 ( 1 - 1 K ) ) 2 · ( K - 1 ) · N 0 · B · σ ‾ 2
Wherein, P KmaxBe the maximum error probability of the K QAM of unit communication service tolerance, N 0Be monolateral band border thermal noise power spectrum density, B is transmission signals bandwidth (Hz),
Figure FDA0000089145940000025
Be the average channel noise power, Q represents the Q function table.
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CN103684641A (en) * 2013-12-31 2014-03-26 遵义天义利威机电有限责任公司 Cognitive radio cooperative spectrum sensing mechanism based on overlapping coalition game
CN106851672A (en) * 2017-01-20 2017-06-13 国家计算机网络与信息安全管理中心 The method and device that packet forwarding Game with Coalitions payment model builds
CN110233686A (en) * 2018-06-20 2019-09-13 桂林电子科技大学 Stabilization matching method of the cognition wireless network based on Game with Coalitions

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CN110233686A (en) * 2018-06-20 2019-09-13 桂林电子科技大学 Stabilization matching method of the cognition wireless network based on Game with Coalitions

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