CN105636110B - A kind of method of the distributed channel detection and sequential access of enhancing - Google Patents
A kind of method of the distributed channel detection and sequential access of enhancing Download PDFInfo
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Abstract
The present invention provides a kind of methods for carrying out distributed channel detection and sequential access of enhancing.According to the solution of the present invention, it so that external network need to only carry out its operation for bearing normalized total jamming power numerical value of the determination of limited times, and is broadcasted except iterative process by exclusive channel.During channel detection, every communication link all only measures the transmission quality of local[remote, and interactive information is not necessarily between each communication link.Meanwhile new communication link is automatically inferred to its maximum achievable Signal to Interference plus Noise Ratio according to its link-local metrical information, and determines whether it accesses whereby and transmit on the same channel simultaneously with all activated link.
Description
Technical field
The present invention relates to wireless communication technique more particularly to a kind of sides for carrying out distributed channel detection and sequential access
Method.
Background technique
Wireless network is understood as available point point protocol communication link (a pair of hair of the interaction with power control
Penetrate machine and receiver) set.The mode of this modeling can be adapted for most of actual no linear systems with interference and coupling
In system, for example, multilayer cellular system, intensive cellular system, Cognitive radio networks, ad hoc network and MIMO transmission and
The symbiotic system of a variety of wireless access technologys, such as the wireless communication system that WiFi and cellular system coexist.Multiple communication links
In each correspond to single-hop transmission in the same channel, not only interfere with each other, outside transmission can also be generated not
The influence of benefit.In order to improve the degree of spatial reuse, network always wants to activate communication chain as much as possible in the same channel
Road, and one group of suitable power is distributed for the communication link of all activation, it makes an uproar so that the letter of each communication link is dry
It is not less than their desired threshold values than (Signal-to-Interference-and-Noise Ratio, SINR), and at the same time
Other external influences transmitted will be maintained within the acceptable range.
In practice, it is expected that realizing such network in a manner of autonomous and distributed.This distributed medium access
Control enables to the deployment of network more convenient, this allows network while accommodating more and more users, will not cause
The variation of network structure and network management system, and avoid the capacity with user and the increased control overhead of index.To one
For the network of a self-organizing, the new communication link in network to be added to will be decided whether to access the net by its own
Network.This has just drawn following problem: how Distributed probing (probe) channel and how to obtain enough local informations to
Independently predict by existing network receive after meet activation communication link protection (Active Link Protection,
ALP the achievable SINR of maximum under the conditions of).The concept of ALP refers in particular to such a non-intrusive communicating requirement, refers specifically to new
The transmission of communication link is authorized to and activates when in its desired SINR level, and network can be sought to some power to match
It sets, guarantees that the SINR of the communication link of all activation in same channel is always not less than its target SINR, and by new
It is still endurable to total interference of external network caused by communication link and existing communication link.The concept of ALP reflects
For system condition needed for effective spatial reuse.For this purpose, the present inventor its application No. is
A kind of distributed channel detection and sequential access (DIStributed are proposed in the patent of invention Shen of 201310261214.X
Channel prObing and SEquential Access, DISCO-SEA) method and system, by way of iteration into
The adaptive adjustment of row transmission power, to solve the above problem in a manner of autonomous.
However, in the method for the DISCO-SEA, it is desirable that external network all carried out during each iteration it is primary
The measurement of normalization interference general power, and the numerical value of general power will be interfered to lead to the normalization during each iteration
Dedicated channel is crossed to be broadcasted.In view of in the deployment of the symbiotic system of practical application, internal network and external network may
Different management entities is belonged to, the communication between them is not easily achieved, and in the biggish situation of the number of iterations,
The measurement and the introduced overhead of broadcast operation and signaling overheads may increase to the degree for significantly affecting overall performance,
Therefore still there is the requirement further enhanced to this method.
So target of the invention is exactly to find a kind of DISCO-SEA method of enhancing, it is possible to reduce external network carries out
The number of the measurement of normalization interference general power, while the signaling interaction times of external network and internal network are also reduced, from
And further improving performance.
Summary of the invention
To solve the above problem in the prior art, the invention proposes the DISCO-SEA methods of enhancing.In whole process
In, external network need to only carry out the measurement of twice-normalization interference general power, reach the mesh for reducing external network measurement operation
, to solve the above problem present in original method.
Specifically, according to the first aspect of the invention, proposing a kind of method for carrying out distributed channel detection, wherein
There are the communication link of L-1 item activation in the channel, L >=2, the communication link l, l=1,2 ... of every activation, L-1, point
Not Ju You a pair of of transmitter and receiver associated there, each transmitter is according to respective transmissions power while in the letter
Signal is sent on road, also, new communication link L attempts to access the channel, simultaneously with the communication link that activates with the L-1 item
Signal is transmitted on that channel, the new communication link L has the first transmitter associated there and the first receiver,
There is also external communication link in the channel, the external communication link has the second transmitter associated there and second
Receiver, which comprises
(S1) transmitter of the communication link l of every activation is in t moment respectively with respective transmission power pl(t), l=1,
2 ..., L-1 send signal to corresponding receiver；
(S2) in t moment, the receiver of the communication link l of every activation determines the communication link of the activation respectively
The Signal to Interference plus Noise Ratio of lNumerical value, wherein Glk, l=1,2 ..., L indicate the communication chain from activation
The transmitter of road k to activation communication link l receiver channel gain；nl, l=1,2 ..., L indicate the activation
Communication link l ambient noise power, the ambient noise of the communication link l of the activation is logical in addition to the activation
Believe other interference further comprised in addition to from L communication link except the receiver thermal noise of link l, and the letter is done
It makes an uproar and compares SINRl(t) numeric feedback is to the transmitter；
(S3) in t moment, the transmitter of the communication link l of every activation is based on the Signal to Interference plus Noise Ratio SINRl(t)
The target signal to noise ratio β of numerical value and the communication link l of every activationlCome update the transmitter in next moment t+1
Transmission power pl(t+1), and in moment t+1 with updated transmission power pl(t+1) institute is sent to the corresponding receiver
State signal；
(S4) the communication link l of every activation is iteratively repeated according to t=t+1 mode implements the step (S2) extremely
The step (S3) is until the Signal to Interference plus Noise Ratio SINRl(t) numerical stability；
(S5) second receiver of the external communication link determines the normalized power externally interfered
Numerical value；
(S6) when the normalized power externally interferedWhen, the first transmitting of the new communication link L
Machine is with constant emission power pL(t)=PLContinuously send detectable signal；
(S7) first receiver of the new communication link L determines the letter at the current time of the new communication link L
Dry ratio of making an uproar
(S8) receiver of the communication link l of every activation determines that the letter of the communication link l of the activation is dry respectively
It makes an uproar ratioNumerical value, and by Signal to Interference plus Noise Ratio SINRl(t) numeric feedback is to the transmitting
Machine；
(S9) in t moment, the transmitter of the communication link l of every activation is based on the Signal to Interference plus Noise Ratio SINRl(t)
The target signal to noise ratio β of numerical value and the communication link l of every activationlCome update the transmitter in next moment t+1
Transmission power pl(t+1), and in moment t+1 with updated transmission power pl(t+1) institute is sent to the corresponding receiver
State signal；
(S10) the communication link l of every activation is iteratively repeated according to t=t+1 mode implements the step (S8)
To the step (S9) until the Signal to Interference plus Noise Ratio SINRl(t) numerical stability；
(S11) second receiver of the external communication link determines the normalized power externally interfered's
Numerical value；
(S12) first receiver of the new communication link L determines the of the current time of the new communication link L
One numerical value, wherein first numerical value is related to the signal at the current time of the new communication link L, interference and/or noise；
(S13) first receiver of the new communication link L is based on first numerical value, the signal-to-noise ratio SINRL, η
Numerical value and the normalized power externally interferedNumerical value determine the new communication link L's
Maximum achievable Signal to Interference plus Noise RatioAnd fed back to first transmitter of the new communication link L；And
(S14) first transmitter of the new communication link L is by the achievable Signal to Interference plus Noise Ratio of maximumWith institute
State the target signal to noise ratio β of new communication link LLIt is compared, whether the channel is accessed with the determination new communication link L.
Preferably, in the step (S3), the transmitter of the communication link l of every activation updates according to the following formula
Transmission power p of the transmitter at the t+1 momentl(t+1):
Preferably, in the step (S5), second receiver of the external communication link comes true according to the following formula
The fixed normalized general power externally interferedNumerical value:
Wherein,Indicate the scheduled be able to bear total dry from the maximum of L link of the external communication link
Disturb performance number, wL-=[w1 w2 … wL-1]T, wl, l=1,2 ..., L-1 indicate the transmitting from the communication link l of the activation
Machine to the external communication link the second receiver channel gain, pL-(t)=[p1(t) p2(t) … pL-1(t)]T, pl
(t), l=1,2 ..., L-1 indicate the communication link l of the activation in the transmission power of the transmitter of t moment.
Preferably, in the step (S9), the transmitter of the communication link l of every activation can be according to the first iteration
Policy Updates transmission power updates the transmitter in the transmission power p at t+1 moment according to the following formulal(t+1):
Preferably, further include in the step (S7) it is described every activation communication link l receiver respectively determine institute
State the normalization numerical value of this Earth noise of the communication link l of activationAnd by the numeric feedback to the transmitter；
In the step (S9), the transmitter of the communication link l of every activation can be according to secondary iteration rule more
New transmission power updates the transmitter in the transmission power p at t+1 moment according to the following formulal(t+1):
Preferably, in the step (S11), second receiver of the external communication link comes according to the following formula
Determine the normalized general power externally interferedNumerical value:
Wherein, wLIt indicates to receive from the first transmitter of the new communication link L to the second of the external communication link
The channel gain of machine, PLIndicate the constant emission power of the first transmitter of the new communication link L.
Preferably, in the step (S12), when the step (S9) updates transmitting function according to first rule of iteration
When rate, first numerical value is the Signal to Interference plus Noise Ratio at the current time of the new communication link L
And the first receiver described in the step (S14) determines that the maximum of the new link L of communication can be achieved according to the following formula
Signal to Interference plus Noise Ratio
Preferably, in the step (S12), when the step (S9) emits function according to the secondary iteration Policy Updates
When rate, first numerical value is the signal interference ratio at the current time of the new communication link LAnd
First receiver described in the step (S14) determines that the achievable letter of maximum of the new link L of communication is dry according to the following formula
It makes an uproar ratio
Preferably, second receiver of the external communication link will be describedNumerical value difference
It is sent to first transmitter of the new communication link L.
Preferably, second value NEI is sent to the new traffic by second receiver of the external communication link
First transmitter of link L, wherein the second value
Preferably, second value NEI is sent to the new traffic by second receiver of the external communication link
First transmitter of link L, wherein the numerical value
Preferably, the step (S14) further comprises: when the achievable Signal to Interference plus Noise Ratio of maximumNot less than described
The target signal to noise ratio β of new communication link LLWhen, first transmitter independently determines that the new communication link L accesses the letter
Road, the new communication link L become the communication link of activation；When the achievable Signal to Interference plus Noise Ratio of maximumIt is new logical less than described
Believe the target signal to noise ratio β of link LLWhen, first transmitter determines that the new communication link L automatically stops sending signal,
The channel is not accessed and exits transmission.
Preferably, when the new communication link L becomes the communication link of activation, the method also includes following steps:
(S15) transmitter of all activated communication link determines respective transmission power, so that every activation is logical
The Signal to Interference plus Noise Ratio of letter link is not less than respective target signal to noise ratio β respectivelyl, and all activated communication link be applied to it is described
The power always interfered of external communication link be able to bear comes from L no more than the scheduled of the external communication link
The total interference power values of maximum of link
According to the second aspect of the invention, a kind of side according to any one of according to a first aspect of the present invention is proposed
Method by a plurality of new communication link successively it is sequential access channel in method, wherein whenever a new communication link attempts to access
The channel is implemented when transmitting signal on that channel simultaneously with all activated communication links according to according to this hair
Method described in any one of bright first aspect, until the channel is no longer able to extend the new communication link.
According to the third aspect of the invention we, it proposes a kind of for will be in a plurality of new communication link successively sequential access channel
Distributed channel detection and sequential access system, wherein whenever a new communication link attempts to access the channel, with institute
When having activated communication link while transmitting signal on that channel, which implements to appoint according to a first aspect of the present invention
Method described in one, until the channel is no longer able to extend the new communication link.
The DISCO-SEA scheme of the enhancing herein proposed is dry by the normalization of iterative process and 2 external networks twice
Disturb general power measuring process alternating implement, thus independently and calculate to a nicety the maximum for new communication link can
The SINR of realization.Then, new communication link decides whether to access with target SINR by comparing the achievable SINR of the maximum.
If the latter is not above the former, new communication link will be identified that the communication link of non-intruding, so as to be swashed by all
Communication link living receives.Otherwise, which will independently exit.Then, distributed power optimization can also be implemented
Interval, with the carry out power optimization of the communication link to all received activation, so that their SINR and total pair
Outer interference all meets the requirement of ALP.By channel detection and power optimization, all only measurement is single logical with this for every communication link
Believe the associated local transmission quality information of link, and without interactive information (in addition to normalized between each communication link
Externally interference total power value).This distributed characteristic makes more autonomously and channel detection and access side has been neatly realized
Case, this allow that the number of expanding communication link as much as possible in a manner of sequential superposition in the same channel, to realize
The way to manage of more effective spatial reuse without changing network.
Further, the DISCO-SEA of the enhancing herein proposed provides a kind of cognitive ability, can only rely upon this
Ground measurement calculates the achievable SINR of maximum an of global optimum, wherein maximum achievable SINR is accurately characterized
The message capacity of new communication link is left in activation network (pre-) for.This cognitive ability can be used in large range of wireless application,
Including user's pairing, cell search correlations and channel-aware.
The DISCO-SEA system of enhancing proposed by the invention is dedicated to answering one for solving most in the case where ALP is constrained
Global optimum's conditional equation of big achievable SINR.The present invention does not need information exchange or center association between each communication link
Adjust device.On the contrary, iterative algorithm of the invention actually gives the recessive process of information collection and interaction, some of overall situations
Information is packaged in a manner of calculated result and iteration.When iteration convergence, new communication link can find out maximum can be achieved
SINR.The main advantage that the present invention has is as follows:
1. enhancing DISCO-SEA system provide a kind of distributed channel detectivity, can calculate to a nicety as
SINR can be achieved in the maximum that it can be obtained when fruit new communication link is added into the network of activation.The DISCO-SEA system of enhancing
System characterizes the message capacity for having activated network (pre-) to leave new communication link for according to maximum achievable SINR.This characteristic manner
Ensure that global optimum or the Pareto (Pareto) of spatial reuse are optimal in certain meanings.The system is for system critical point
Predictive ability be much better than the prior art.
2. the DISCO-SEA system of enhancing realizes online Noninvasive detection and access.The present invention, which allows to detect, to be communicated
Link carrys out emission detection signal with any constant power level, and other communication links still can be at the interval of channel detection
Send data-signal.Detection behavior according to the present invention is non-emulative and non-attacking.Specifically, detectable signal
Power can be configured to very little, so that the interference due to caused by detection communication link will not influence the number of the communication link of activation
According to transmission.In addition, the DISCO-SEA system of enhancing provide a kind of network towards after extension mode is effectively predicted, without
It is the state for the currently active network.
3. the DISCO-SEA system of enhancing ensures the good backwards compatibility with current wireless system.Enhancing
Power renewal process used in DISCO-SEA system be similar to distributed power control mechanism (its as standardized technique
Through being widely used in current wireless system).Meanwhile the actual implementation of the DISCO-SEA system of enhancing merely relates to
The local measurement of SINR, SNR and normalized noise, this is all convenient for communication system.Therefore, by only more
The mode for changing power update can the easy DISCO-SEA system by existing communication system upgrading to enhancing.For example, passing through
Using the DISCO-SEA system of enhancing, the cellular network of single layer can be extended to double-deck or even multilayer honeycomb system immediately
System.
In conclusion the cognitive ability of SINR can be achieved in the maximum that the present invention provides a kind of for predicting the overall situation, only
Only rely upon local measured value.Based on these local measured values, new communication link can autonomously and independently make with
Ensure that the access of condition premised on ALP determines.This cognitive ability is avoided for collecting each link information, must lead in each item
Believe the signaling overheads of interaction between link, and promotes the space recycling ability of network.Usually these links collected
Information is for managing network internal and external interference, so as to improve the spatial reuse efficiency of network.
Various aspects of the invention will be more clear by the explanation of embodiment in detail below.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent:
Fig. 1 shows the system of the detection and sequential access system of distributed channel according to embodiment of the present invention
Block diagram；
Fig. 2 shows according to embodiment of the present invention for distributed channel detection and sequential access system
Frame structure；
Fig. 3 shows the distributed channel that is used for according to embodiment of the present invention and detects and sequential access system
Channel configuration schematic diagram；
Fig. 4 shows the distributed channel that is used for according to embodiment of the present invention and detects and sequential access system
The functional block diagram；
Run through different diagrams in the figure, same or similar appended drawing reference indicates identical or corresponding component or spy
Sign.
Specific embodiment
The invention proposes a kind of detection of the distributed channel of enhancing and sequential access (DSICO-SEA) schemes, to pass through
Automatically by the mode extended network of communication link sequential superposition in the same channel, high spatial reuse efficiency is obtained.The present invention
Basic ideas be to propose a kind of distributed algorithm, just with local measured value under conditions of power constraint really
Determine the achievable SINR of maximum of global optimum.Hereafter by detail from the angle of optimization illustrate power constraints under based on
The problem of global maximum achievable SINR, and how on mathematically derive the algorithm.
1. problem model
The problem model is suitable for the scene of sequential access channel.Consider following scene: common radio channel (for example,
One piece of running time-frequency resource) it is shared by the wireless network and external communication link that activate.The wireless network of the activation is in same letter
The L-1 communication links interfered with each other are contained in road, wherein every communication link achieves the reality higher than its target SINR
SINR, and be applied to total interference power values in external communication link and be not above the scheduled upper limit.Meanwhile new traffic
Link L is intended to access the network.Although new communication link L wishes to access same channel with desired SINR level, activation
Network only receives the link of a Noninvasive, i.e. its target SINR is not above maximum achievable critical value, to make
Must include new communication link L extension after network still meet this condition of ALP.In the physical sense, this maximum can be real
Existing SINR reflects the ability of the spatial reuse for new communication link L, and the wireless network for also having measured activation is left for
The available remaining channel capacity of new communication link L.According to this rule, the network of the activation of update can sequentially allow
The communication link of new Noninvasive, and the communication link of new Noninvasive can be superimposed on the same channel, until extension
Network reach critical point.
That is there is a kind of power configuration, p=[p1 p2 … pL]T, it is to meet following ALP condition (ALP
Condition)。
Wherein,
●plIndicate the transmission power of communication link l；
●βlIndicate the target SINR of communication link l；
●Indicate scheduled the be able to bear total jamming power of maximum from L link of external communication link
Value；
●GlkIndicate the channel gain of the receiver from the transmitter of communication link k to communication link l；
●nlThe general power for indicating the ambient noise of communication link l, is used to illustrate thermal noise and comes from except L link
Interference gross effect；
●wlIndicate the channel gain of the receiver from the transmitter of communication link l to external communication link.
Therefore given the target SINR of the communication link of L-1 item activation, SINR energy is can be achieved in the maximum of new communication link L
It is enough to be exported by solving following optimization problems.
Problem 1:max βl
Constraint condition SINRl(p)≥βl, l=1,2 ..., L-1
SINRL(p)=β L
P > 0
Variable: p, βL
Wherein, w=[w1 w2 … wL]T, subscript ()TIndicate transposition.WithThe optimal solution of expression problem 1, i.e. link L
The achieved maximum Signal to Interference plus Noise Ratio in the case where meeting ALP constraint condition.
According to disclosure of that of the inventor in its patent of invention Shen application No. is 201310261214.X,It can
To indicate are as follows:
Wherein,
●fL, L-=[GL1 GL2 … GL(L-1)]；
●wL-=[w1 w2 … wL-1]T；
●
●
● diag () indicates the diagonal matrix being made of component of a vector；
● the calculating of ο expression Schur product；
●(·)TThe transposition of representing matrix or vector；
●(·)-1Representing matrix it is inverse
●fL-, L=[G1L G2L … G(L-1)L]T；
●βL=[β1 β2 … β(L-1)]T；
●
●nL-=[n1 n2 … nL-1]T；
●PLIndicate the probe power of new communication link L；
●FLIndicate the principal minor array by deleting the F that L row and L column obtain, wherein F table
Show L × L matrix of interference channel channel gain, wherein
2. the Distributed-solution of enhancing
It will demonstrate that formula (1) can be rewritten as following form below:
And
Wherein
● η=(I-diag (βL-οvL-)FL-)-1diag(βL-οvL-)nL-；
● π=(I-diag (βL-οvL-)FL-)-1diag(βL-οvL-)fL-, LPL；
● π '=(I-diag (βL-οvL-)FL-)-1diag(βL-οvL-)(fL-, LPL+nL-)
It proves as follows: when the existing network being made of L-1 item activation link meets ALP condition, and consideringThe fact that be a positive matrices, following formula is necessarily set up:
ρ(diag(βL-οvL-)FL-) < 1.
Here, ρ () indicates the Perron-Frobenius characteristic value of nonnegative matrix.This illustrates matrix (I-diag
(βL-οvL-)FL-) it is nonsingular.If AL-=diag (βL-οvL-)FL-, then can be obtained by Woodbury identity,
(4) are substituted into (1) formula, we obtain:
That is formula (2) has then just obtained formula (3) according to π=π '-η.
Next the maximum result that can reach Signal to Interference plus Noise Ratio SINR will be calculated using distributed method.
First:
Wherein:
[1] item in equation (5) square brackets indicates to carry out the internal interference of self-activation link；[2] item is indicated from spy
The internal interference on surveyor's chain road；.Meanwhile equation (5) describes a kind of iterative algorithm, the communication link of activation will be calculated according to the iteration
Method updates transmission power, as the response to detectable signal.
Equation (5) can be rewritten are as follows:
Wherein,
●SINRP, L(t)=[SINR1(t) SINR2(t) … SINRL-1(t)]TAnd
●It indicates in βL-And SINRP, L-(t) division by component direction between.
Equation (6) illustrates the distributed method of the transmission power of the link in probe interval for calculating each activation,
That is:
Wherein, all variables can be measured via link-local and be obtained.
On the other hand, available:
Wherein,
pC, L-(t+1)=[pC, 1(t+1) pC, 2(t+1) … pC, L-1(t+1)]T
=diag (βL-οvL-)FL-pC, L-(t)+diag(βL-οvL-)nL-
=diag (βL-οvL-)[FL-pP, L-(t)+nL-] (9)
Describe the iterative algorithm that activation link minimizes system total transmission power.Equation (9) can be rewritten are as follows:
Wherein,
●SINRC, L-(t)=[SINR1(t) SINR2(t) … SINRL-1(t)]TAnd
●It indicates in βL-And SINRC, L-(t) division by component direction between.
Formula (10) describes a kind of distributed calculation that every activation link transmission power is calculated during power optimization
Method:
Wherein all variables can be measured via link-local and be obtained.Obviously, formula (7) and (11) illustrate a kind of system
One iterative algorithm, this is exactly an important advantage of the DSICO-SEA method of enhancing according to the present invention.
Further, in order to reduce error, we can also directly calculate π rather than π=π '-η.
According to the following formula:
Wherein,
[1] item in square brackets indicates to carry out the internal interference of self-activation link；[2] item is indicated from detecting link
Internal interference；Equation (13) can be rewritten as
Wherein,
●SINRP ', L-(t)=[SINR1(t) SINR2(t) … SINRL-1(t)]TAnd
●It indicates in βL-And SINRP ', L-(t) division by component direction between.
Formula (14) describes another distributed algorithm that every activation link transmission power is calculated in detection process:
Wherein all variables can be measured via link-local and be obtained.
3. for the channel detection of enhancing and the distributed algorithm of sequential access
Based on above-mentioned analysis, we can use local measured value to calculate the global optimum under ALP constraint most
SINR achievable greatly.This basic distributed process for channel detection can design as follows:
Step 1: setting t=0 and any positive pl(0), l=1,2 ..., L-1, and the communication link l of every activation
Transmitter in t moment respectively with respective transmission power pl(t), l=1,2 ..., L-1 send to corresponding receiver and believe
Number.
Step 2: repeat implementation steps 2.1-2.3:
Step 2.1: the receiver of the communication link l of every activation separately determines local Signal to Interference plus Noise RatioNumerical value, and by the numeric feedback give corresponding transmitter.
In the formula of above-mentioned SINR, GlkIndicate the channel of the receiver from the transmitter of communication link k to communication link l
Gain, k, l=1,2 ..., L.
Similarly, for example, in practice, each receiver will determine the number of the SINR according to received signal
Value.These signals include but is not limited to the signal that the transmitter of each communication link is sent.Furthermore, it is desirable to, it is noted that in reality
In border, the numerical value of formula S INR can be estimated using other suitable methods, and calculate number not in strict accordance with the formula
Value.It means that in this step, it is only necessary to be estimated by any suitable methodThe numerical value of the corresponding local Signal to Interference plus Noise Ratio of this formula.
Step 2.2: every activation communication link l transmitter update according to the following formula the transmitter next
The transmission power p of moment t+1l(t+1), and in moment t+1 with updated transmission power pl(t+1) it is sent out to corresponding receiver
The number of delivering letters.
Wherein, βlFor the corresponding target signal to noise ratio of the communication link l of each item activation.
Step 2.3: setting t=t+1 for t.
Step 3: the communication link l of every activation is iteratively repeated implementation steps 2.1 to step 2.3 according to t=t+1 mode
Until the numerical stability of Signal to Interference plus Noise Ratio SINRl (t).
Step 4: external node measures the normalized external interference total power value at this moment:
Wherein, pL-(t)=[p1(t) p2(t) … pL-1(t)]T。
Step 5: ifIllustrate system at this time and not can guarantee the limitation requirement of the interference to external node,
It needs to remove the communication link of an activation and is retracted into step 1 after L=L-1 is set；IfIllustrate that system has reached
To critical point, system will refuse the access of any new communication link at this time；Otherwise, then enter next step.
Step 6: the transmitter of new communication link L is with constant transmission power pL(t)=PL(to its corresponding receiver) is held
Supervention send detectable signal.
Step 7: the receiver of new communication link L measures local Signal to Interference plus Noise Ratio
Step 8: repeat implementation steps 8.1-8.3:
Step 8.1: the receiver of the communication link l of every activation separately determines local Signal to Interference plus Noise RatioNumerical value, and by the numeric feedback give corresponding transmitter.
Step 8.2: every activation communication link l transmitter update according to the following formula the transmitter next
The transmission power p of moment t+1l(t+1), and in moment t+1 with updated transmission power pl(t+1) it is sent out to corresponding receiver
The number of delivering letters.
Step 8.3: setting t=t+1 for t.
Step 9: the communication link l of every activation is iteratively repeated implementation steps 8.1 to step 8.3 according to t=t+1 mode
Until Signal to Interference plus Noise Ratio SINRl(t) numerical stability.
Step 10: meanwhile, external node measures the normalized total power value externally interfered at this moment:
Step 11: the receiver of new communication link L measures the local Signal to Interference plus Noise Ratio of the link,
And calculate its maximum achievable SINR according to the following formula, and fed back to the transmitter of new communication link L.
Step 12: the transmitter of new communication link L is by maximum achievable Signal to Interference plus Noise RatioWith the target of new communication link L
Signal-to-noise ratio βLIt is compared, to determine whether new communication link L accesses channel.If meeting following formula:
Then the transmitter of new communication link L independently determines that new communication link L accesses channel, and new communication link L becomes activation
Communication link.Conversely, the transmitter of new communication link L determines that new communication link L automatically stops sending signal, letter is not accessed
Road simultaneously exits transmission.
It is presented above according to one embodiment of present invention, carries out the specific steps of channel detection and sequential access.?
In the program, external node needs for the normalized total power value externally interfered measured twice to be respectively sent to newly logical
Believe the transmitter of link.
Preferably, second value NEI can also be directly sent to the transmitter of new communication link by external node,
Wherein second valueThe advantages of this scheme be can by external node and internal network it
Between Signalling exchange it is primary from being reduced to twice.
Preferably, after the above step, following power optimization step can also be implemented:
The transmitter of all activated communication link determines respective transmission power, so that the communication link of every activation
Signal to Interference plus Noise Ratio be not less than respective target signal to noise ratio β respectivelyl, and all activated communication link is applied to the outside and leads to
Believe that the power always interfered of link be able to bear comes from L link no more than the scheduled of the external communication link
The total interference power values of maximum
Specifically, L=L+1 can be set and execute abovementioned steps after new communication link L becomes the communication link of activation
1 to step 3 process, the power distribution optimized by way of iteration；It obtains under the conditions of meeting ALP, system is total
The optimized power allocation plan that transmission power minimizes.
As another optional scheme, according to one embodiment of present invention, channel detection and sequential access are carried out
Specific step is as follows:
Step 1: setting t=0 and any positive pl(0), l=1,2 ..., L-1, and the communication link l of every activation
Transmitter in t moment respectively with respective transmission power pl(t), l=1,2 ..., L-1 send to corresponding receiver and believe
Number.
Step 2: repeat implementation steps 2.1-2.3:
Step 2.1: the receiver of the communication link l of every activation separately determines local Signal to Interference plus Noise RatioNumerical value, and by the numeric feedback give corresponding transmitter.
In the formula of above-mentioned SINR, GlkIndicate the channel of the receiver from the transmitter of communication link k to communication link l
Gain, k, l=1,2 ..., L.
Similarly, for example, in practice, each receiver will determine the number of the SINR according to received signal
Value.These signals include but is not limited to the signal that the transmitter of each communication link is sent.Furthermore, it is desirable to, it is noted that in reality
In border, the numerical value of formula S INR can be estimated using other suitable methods, and calculate number not in strict accordance with the formula
Value.It means that in this step, it is only necessary to be estimated by any suitable methodThe numerical value of the corresponding local Signal to Interference plus Noise Ratio of this formula.
Step 2.2: every activation communication link l transmitter update according to the following formula the transmitter next
The transmission power p of moment t+1l(t+1), and in moment t+1 with updated transmission power pl(t+1) it is sent out to corresponding receiver
The number of delivering letters.
Wherein, βlFor the corresponding target signal to noise ratio of the communication link l of each item activation.
Step 2.3: setting t=t+1 for t.
Step 3: the communication link l of every activation is iteratively repeated implementation steps 2.1 to step 2.3 according to t=t+1 mode
Until Signal to Interference plus Noise Ratio SINRl(t) numerical stability.
Step 4: external node measures the normalized external interference total power value at this moment:
Step 5: ifIllustrate system at this time and not can guarantee the limitation requirement of the interference to external node,
It needs to remove the communication link of an activation and is retracted into step 1 after L=L-1 is set；IfIllustrate that system has reached
To critical point, system will refuse the access of any new communication link at this time；Otherwise, then enter next step.
Step 6: the transmitter of new communication link L is with constant transmission power pL(t)=PL(to its corresponding receiver) is held
Supervention send detectable signal.
Step 7: the receiver of new communication link L measures local Signal to Interference plus Noise Ratio SINR
Step 8: the communication link l of every activation separately determines the normalization numerical value of this Earth noiseAnd it will
The numeric feedback is to the transmitter；
Step 9: repeat implementation steps 9.1-9.3:
Step 9.1: the receiver of the communication link l of every activation separately determines local Signal to Interference plus Noise RatioNumerical value, and by the numeric feedback give corresponding transmitter.
Step 9.2: every activation communication link l transmitter update according to the following formula the transmitter next
The transmission power p of moment t+1l(t+1), and in moment t+1 with updated transmission power pl(t+1) it is sent out to corresponding receiver
The number of delivering letters.
Step 9.3: setting t=t+1 for t.
Step 10: the communication link l of every activation is iteratively repeated implementation steps 9.1 to step according to t=t+1 mode
9.3 until Signal to Interference plus Noise Ratio SINRl(t) numerical stability.
Step 11: meanwhile, external node measures the normalized total power value externally interfered at this moment:
Step 12: the receiver of new communication link L measures the local signal interference ratio SIR of the link,
And calculate its maximum achievable SINR according to the following formula, and fed back to the transmitter of new communication link L.
Step 13: the transmitter of new communication link L is by maximum achievable Signal to Interference plus Noise RatioWith the target of new communication link L
Signal-to-noise ratio βLIt is compared, to determine whether new communication link L accesses channel.If meeting following formula:
Then the transmitter of new communication link L independently determines that new communication link L accesses channel, and new communication link L becomes activation
Communication link.Conversely, the transmitter of new communication link L determines that new communication link L automatically stops sending signal, letter is not accessed
Road simultaneously exits transmission.
It is presented above according to still another embodiment of the invention, carries out the specific steps of channel detection and sequential access.
In this scenario, the normalized total power value externally interfered measured twice is respectively sent to newly by external node needs
The transmitter of communication link.
Preferably, second value NEI can also be directly sent to the transmitter of new communication link by external node,
Wherein second valueThe advantages of this scheme is can be by the signaling between external node and internal network
Interaction is primary from being reduced to twice.
Likewise, preferably, after the above step, following power optimization step can also be implemented:
The transmitter of all activated communication link determines respective transmission power, so that the communication link of every activation
Signal to Interference plus Noise Ratio be not less than respective target signal to noise ratio β respectivelyl, and all activated communication link is applied to the outside and leads to
Believe that the power always interfered of link be able to bear comes from L link no more than the scheduled of the external communication link
The total interference power values of maximum
Specifically, L=L+1 can be set and execute abovementioned steps after new communication link L becomes the communication link of activation
1 to step 3 process, the power distribution optimized by way of iteration；It obtains under the conditions of meeting ALP, system is total
The optimized power allocation plan that transmission power minimizes.
Below, it will be discussed in detail by means of system structure and be used to execute the embodiment party of the DISCO-SEA system of enhancing
Formula.
1 system block diagram
Fig. 1 shows the system of the detection and sequential access system of distributed channel according to embodiment of the present invention
Block diagram.The system includes the communication link of L-1 excited inside, by 1,2 ..., L-1 mark, and the internal detection identified by L
Communication link (that is, new communication link).These communication links are on same common radio channel (for example, identical running time-frequency resource)
It is superimposed simultaneous transmission of signals, at the same time, external communication link is also superimposed on the same channel.
1) unit 1-l and unit 2-l indicate the communication link of the l articles activation transmitter and receiver (l=1,2 ...,
L-1).Unit 1-l sends data-signal to unit 2-l.
2) unit 1-L and unit 2-L indicates the transmitter and receiver of detection communication link L (that is, new communication link L).
Unit 1-L sends data-signal to unit 2-L.
3) unit 3 and unit 4 indicate the transmitter and receiver of external communication link.Unit 3 sends signal to unit 4.
External communication link can for example be considered as principal communication link (for example, macrocell in multilayer grouping), and it is expected
Total interference power values that unit 4 is reached as caused by L communication link are less than the scheduled upper limit.
2. time frame structure
Fig. 2 shows the time frame structures of the DISCO-SEA system for enhancing.As shown, a frame includes three companies
Continuous interval is used for different purposes.Each interval includes multiple time slots, by ..., t, t+1, t+2 ... } mark.It can
Each interval is divided into three classes according to function.
1) it probe interval: is detected for distributed channel.During this period, the transmitter of communication link is detected with firm power
Emission detection signal, and its receiver calculates maximum achievable SINR according to aforementioned distributed algorithm.At the same time, each to swash
Communication link living is by updating its transmission power according to aforementioned distributed algorithm, to send data-signal.In probe interval
At the end of, detection communication link is independently made whether the decision of access channel.
2) power optimization interval: optimizing for distributed power, to find and determine for all communications for allowing to access
The optimal power allocation scheme of link.During this period, all to allow the communication link accessed by being optimized according to aforementioned power
Step updates its transmission power, to send data-signal.Power optimization interval at the end of, it is all allow access communications
Link can obtain suitable power configuration automatically to meet the condition of this Noninvasive of ALP.
3) regular intervals: the communication link of all permissions sends signal during this period, and no longer updates transmission power.
As shown in Fig. 2, system is added to communication link as much as possible in same channel with sequential sequence.
3. channel configuration
Fig. 3 shows the channel configuration schematic diagram of the DISCO-SEA system for enhancing.In addition to the public affairs transmitted for data
To also the following two kinds signaling channel be arranged in wireless channel altogether:
1) unit 14-l indicates the feedback letter of the transmitter from the receiver of l communication link to l communication link
Road.The feedback channel is only used for l communication link, and can be used for returning the numerical value of local SINR, and local normalization is made an uproar
The maximum of new communication link can be achieved the numerical value etc. of SINR in sound power value.
2) unit 15 indicates the common radio channel for being used for transmission data, the wireless network in a manner of superposition by activating
It is shared with external communication link.Internal communication link transmits data-signal and detectable signal by it.
3) unit 16 indicates the exclusive channel for broadcasting normalized external interference total power value from unit 4.In all
The Receiver And Transmitter of portion's communication link can obtain the numerical value of normalized external interference general power from the channel.
4. functional module
Fig. 4 shows the basic function module for DISCO-SEA system.In order to implement aforementioned algorism, system is for example needed
Want following functional module.
1) unit 5 indicates power amplifier, and it includes in the transmitter of each internal communication link.The power amplifier
The size of transmission power can be adjusted according to the input from unit 6.
2) unit 6 indicates power renovator, and it includes in the transmitter of each internal communication link.Power renovator quilt
It is designed as determining to implement power update with the type of present interval according to the access that unit 7 is made.Power renovator will emit
Performance number is input to unit 5.In one embodiment of the invention, the output valve of power renovator can be for example as follows:
Size is PLSteady state value: for the detection communication link during probe interval；
Zero: it can be used as instruction and is used to indicate the backed off after random that detection communication link terminates in probe interval；
The value p calculated according to equation (16) (19) (24) and (27)l(t+1): it is used for during probe interval before
State the transmission power of the communication link of the activation of distributed algorithm calculating；
3) unit 7 indicates access controller, and it includes in the transmitter of each internal communication link.Access controller quilt
It is designed as independently being made whether the decision of access channel according to inequality (23) or (31), and by its output come independently
Control the implementation mode of power renovator.For example, the value of its output can be one in following:
" detection ": at the beginning of probe interval for detecting communication link；
" access ": when the condition of inequality (23) or (31) meets, terminate place for detecting communication chain in probe interval
Road；
" exiting ": when the condition of inequality (23) or (31) is unsatisfactory for, it is logical to terminate the detection that place is used in probe interval
Believe link.
4) unit 8 is indicated for storing local target SINR βlMemory.The memory is included in every internal communication
In the transmitter of link, by value output to unit 6 and 7.
5) unit 9 indicates the estimation device for estimating local SINR, and it includes the receptions in every internal communication link
In machine.The estimation device is used to estimate SINR based on received signall(t) numerical value, and by the result of estimation via feedback letter
Road unit 14 is exported to unit 6 or unit 12.
6) unit 10 indicates the estimation device for estimating local signal interference ratio SIR, and it includes in every internal communication link
Receiver in.The estimation device is used to estimate SIR based on received signallNumerical value, and the result of estimation is exported to list
Member 12.
7) unit 11 indicates the estimation device for estimating normalized noise power, and it includes in every internal communication chain
In the receiver on road.The estimation device based on received signal for being estimatedNumerical value, and will estimate during probe interval
The numerical value of meter is exported via feedback channel unit 14 to unit 6.
8) unit 12 indicates that the computing device of SINR can be achieved in the maximum for calculating new communication link.The computing device packet
It is contained in the receiver of every internal communication link.The computing device be arranged to during probe interval according to from unit 9,
10 and 16 input is to calculate according to the equation (22) of aforementioned distributed algorithm or (30).The computing device is during probe interval
The result of maximum achievable SINR is exported to unit 7 via feedback channel unit 14.
9) unit 13 is indicated for estimating as caused by internal communication link to the normalized external of external communication link
Interfere the estimation device of total power value.The estimation device is included in the receiver of external communication link.The estimation device is set
It is set to and normalized external interference total power value is estimated according to aforementioned algorism, and the numerical value is passed through into exclusive broadcast channel unit 16
Broadcast estimated value.
It should be noted that above-described embodiment is only exemplary, rather than limitation of the present invention.It is any without departing substantially from this hair
The technical solution of bright spirit should all be fallen under the scope of the present invention, this includes using occurring in different embodiments not
Same technical characteristic, installation method can be combined, to obtain beneficial effect.In addition, should not will be any attached in claim
Icon note is construed as limiting the claims involved；One word of " comprising " is not excluded for unlisted in other claims or specification
Device or step.
Claims (15)
1. a kind of method for carrying out distributed channel detection, wherein there are the communication link of L-1 item activation, L in the channel
>=2, the communication link l, l=1,2 ... of every activation, L-1 are respectively provided with a pair of of transmitter and receiver associated there,
Each transmitter sends signal simultaneously according to respective transmission power on that channel, also, new communication link L is attempted to access
The channel transmits signal, the new communication link L with the communication link activated with the L-1 item on that channel simultaneously
With the first transmitter associated there and the first receiver, there is also external communication links in the channel, described outer
Portion's communication link has the second transmitter associated there and the second receiver, which comprises
(S1) transmitter of the communication link l of every activation is in t moment respectively with respective transmission power pl(t), l=1,2 ...,
L-1 sends signal to corresponding receiver；
(S2) in t moment, the receiver of the communication link l of every activation determines the communication link l's of the activation respectively
Signal to Interference plus Noise RatioNumerical value, wherein Glk, l=1,2 ..., L indicate the communication chain from activation
The transmitter of road k to activation communication link l receiver channel gain, GllIndicate the hair from the communication link l of activation
Penetrate machine to activation communication link l receiver channel gain；nl, l=1,2 ..., L indicate the communication chain of the activation
The power of the ambient noise of road l, the communication link l of the ambient noise of the communication link l of the activation in addition to the activation
Receiver thermal noise except further comprise other interference in addition to from L communication link, and by the Signal to Interference plus Noise Ratio
SINRl(t) numeric feedback is to the transmitter；
(S3) in t moment, the transmitter of the communication link l of every activation is based on the Signal to Interference plus Noise Ratio SINRl(t) numerical value
The target signal to noise ratio β of the communication link l activated with described everylTo update the hair in next moment t+1 of the transmitter
Penetrate power pl(t+1), and in moment t+1 with updated transmission power pl(t+1) letter is sent to the corresponding receiver
Number；
(S4) the communication link l of every activation is iteratively repeated according to t=t+1 mode implements the step (S2) described in
Step (S3) is until the Signal to Interference plus Noise Ratio SINRl(t) numerical stability；
(S5) second receiver of the external communication link determines the normalized general power externally interfered's
Numerical value；
(S6) when describedWhen, the first transmitter of the new communication link L is with constant emission power pL(t)=PL
Continuously send detectable signal；
(S7) first receiver of the new communication link L determines that the letter at the current time of the new communication link L is dry and makes an uproar
Than
(S8) receiver of the communication link l of every activation determines the Signal to Interference plus Noise Ratio of the communication link l of the activation respectivelyNumerical value, and by Signal to Interference plus Noise Ratio SINRl(t) numeric feedback is to the transmitting
Machine；
(S9) in t moment, the transmitter of the communication link l of every activation is based on the Signal to Interference plus Noise Ratio SINRl(t) numerical value
The target signal to noise ratio β of the communication link l activated with described everylTo update the hair in next moment t+1 of the transmitter
Penetrate power pl(t+1), and in moment t+1 with updated transmission power pl(t+1) letter is sent to the corresponding receiver
Number；
(S10) the communication link l of every activation is iteratively repeated according to t=t+1 mode implements the step (S8) to institute
Step (S9) is stated until the Signal to Interference plus Noise Ratio SINRl(t) numerical stability；
(S11) second receiver of the external communication link determines the normalized general power externally interfered's
Numerical value；
(S12) first receiver of the new communication link L determines first number at the current time of the new communication link L
Value, wherein first numerical value is related to the signal at the current time of the new communication link L, interference and/or noise；
(S13) first receiver of the new communication link L is based on first numerical value, the signal-to-noise ratio SINRL,ηNumber
It is worth and describedNumerical value determine the achievable Signal to Interference plus Noise Ratio of maximum of the new communication link LAnd
Fed back to first transmitter of the new communication link L；And
(S14) first transmitter of the new communication link L is by the achievable Signal to Interference plus Noise Ratio of maximumWith it is described new
The target signal to noise ratio β of communication link LLIt is compared, whether the channel is accessed with the determination new communication link L.
2. the method according to claim 1, wherein in the step (S3), the communication of every activation
The transmitter of link l updates the transmitter in the transmission power p at t+1 moment according to the following formulal(t+1):
3. the method according to claim 1, wherein in the step (S5), the external communication link
Second receiver determines the normalized general power externally interfered according to the following formulaNumerical value:Wherein,Indicate the scheduled be able to bear from L chain of the external communication link
The total interference power values of maximum on road, wL-=[w1 w2 … wL-1]T, wl, l=1,2 ..., L-1 indicate the communication from the activation
The transmitter of link l to the external communication link the second receiver channel gain, pL-(t)=[p1(t) p2(t) …
pL-1(t)]T, pl(t), l=1,2 ..., L-1 indicate the communication link l of the activation in the transmission power of the transmitter of t moment.
4. the method according to claim 1, wherein in the step (S9), the communication of every activation
The first rule of iteration that the transmitter of link l limits according to the following formula updates the transmitter in the transmission power p at t+1 momentl
(t+1):
5. the method according to claim 1, wherein further including the logical of every activation in the step (S7)
The receiver of letter link l determines the normalization numerical value of this Earth noise of the communication link l of the activation respectivelyAnd it should
Numeric feedback is to the transmitter；
In the step (S9), the secondary iteration that the transmitter of the communication link l of every activation limits according to the following formula is advised
Then update the transmitter in the transmission power p at t+1 momentl(t+1):
6. the method according to claim 1, wherein in the step (S11), the external communication link
Second receiver determines the normalized general power externally interfered according to the following formulaNumerical value:
Wherein,Indicate the scheduled be able to bear from the total interference function of the maximum of L link of the external communication link
Rate value, wL-=[w1 w2 … wL-1]T, wl, l=1,2 ..., L-1, indicate from the transmitter of the communication link l of the activation to
The channel gain of second receiver of the external communication link, pL-(t)=[p1(t) p2(t) … pL-1(t)]T, pl(t), l
=1,2 ..., L-1 indicate the communication link l of the activation in the transmission power of the transmitter of t moment, wLIt indicates from described new
The first transmitter of communication link L to the external communication link the second receiver channel gain, PLIndicate described new logical
Believe the constant emission power of the first transmitter of link L.
7. according to the method described in claim 4, it is characterized in that, in the step (S12), when the step (S9) basis
When first rule of iteration updates transmission power, first numerical value is that the letter at the current time of the new communication link L is dry
It makes an uproar ratio
And the first receiver described in the step (S14) determines that the maximum of the new link L of communication can according to the following formula
The Signal to Interference plus Noise Ratio of realization
8. according to the method described in claim 5, it is characterized in that, in the step (S12), when the step (S9) basis
When the secondary iteration Policy Updates transmission power, first numerical value is that the letter at the current time of the new communication link L is dry
ThanAnd the first receiver described in the step (S14) determine according to the following formula it is described
Communicate the achievable Signal to Interference plus Noise Ratio of maximum of new link L
9. method according to claim 1 to 8, which is characterized in that described the second of the external communication link
Receiver will be describedNumerical value be respectively sent to first transmitter of the new communication link L.
10. the method according to the description of claim 7 is characterized in that second receiver of the external communication link will
Second value NEI is sent to first transmitter of the new communication link L, wherein the second value
11. according to the method described in claim 8, it is characterized in that, second receiver of the external communication link will
Second value NEI is sent to first transmitter of the new communication link L, wherein the second value
12. the method according to claim 1, wherein the step (S14) further comprises: when the maximum
Achievable Signal to Interference plus Noise RatioNot less than the target signal to noise ratio β of the new communication link LLWhen, first transmitter is independently true
The fixed new communication link L accesses the channel, and the new communication link L becomes the communication link of activation；When the maximum can
The Signal to Interference plus Noise Ratio of realizationLess than the target signal to noise ratio β of the new communication link LLWhen, first transmitter determines described new
Communication link L automatically stops sending signal, does not access the channel and exits transmission.
13. the method according to claim 1, wherein when the new communication link L becomes the communication link of activation
When, the method also includes following steps:
(S15) transmitter of all activated communication link determines respective transmission power, so that the communication chain of every activation
The Signal to Interference plus Noise Ratio on road is not less than respective target signal to noise ratio β respectivelyl, and all activated communication link is applied to the outside
The power of communication link always interfered is scheduled be able to bear from L link no more than the external communication link
Maximum total interference power values
14. a kind of method according to any one of claim 1 to 13 is by the successively sequential access of a plurality of new communication link
Method in channel, wherein whenever a new communication link attempts to access the channel, with all activated communication links
When transmitting signal on that channel simultaneously, implement method according to any one of claim 1 to 13, until the letter
Road is no longer able to extend the new communication link.
15. a kind of for being with sequential access by the distributed channel detection in a plurality of new communication link successively sequential access channel
System, wherein whenever a new communication link attempts to access the channel, with all activated communication links simultaneously described
When channel signal, which implements according to claim 1 to method described in any one of 14, until the channel is not
The new communication link can be extended again.
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