CN109151775A - D2D communication transmission mode switching method between cellular cell based on relaying - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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Abstract
The invention discloses the D2D communication transmission mode switching methods between cellular cell based on relaying, the cellular system that this method is related to is to have the neighboring community to cross, there are a base station, a phone user, a D2D user in each cell, there is a trunk subscriber in cell intersection；The communication transmission mode of cellular system includes traditional D2D communication pattern, the D2D communication pattern based on AF relaying and the D2D communication pattern based on DF relaying, its switching method are as follows: completed in several time slots once communicated in a pair of of D2D user, obtain the transmission power and link-state information of three kinds of communication transmission modes, obtain the closure expression formula of link maximum achievable rate, maximum achievable rate between mode is compared, it selects to make the maximum transmission mode optimal transmission mode of the total achievable rate of cellular system, carries out dynamic pattern switching.Method of the invention can fully utilize link information, adaptable, and the utilization rate up to total rate and cell resource of system can be improved.
Description
Technical field
The present invention relates to the D2D communication transmission mode switching methods between cellular cell based on relaying, belong to communication technology neck
Domain.
Background technique
Function with smart phone and various mobile terminal devices is become stronger day by day, and user is to network flow and network speed
Requirement it is higher and higher.Since the cellular communication in the 4G communication technology is in " explosive " growth of service of mobile communication and user volume
In the case where be difficult to meet demand, have the characteristics that high maximum achievable rate, the 5G communication technology that transmission rate is fast, expense is small
Develop further urgent.And Device-to-Device (hereinafter referred to as D2D), i.e. terminal direct connection, the pass as the 5G communication technology
Indispensable component part, has started grinding for the communications field in key technology and the development framework of the third generation mobile communication system
Study carefully upsurge.
By using the D2D communication technology, the link of direct communication can be established by being separated by a certain distance interior user terminal, be not necessarily to
By the transfer of base station, and then mitigate the load of base station.Communication distance is generally shorter between D2D user, and transmission channel quality is higher,
Therefore the available lower propagation delay time of user, higher transfer rate, the experience such as a large amount of information exchange, and it is smaller
Power consumption can effectively increase cruise duration of mobile device.Since D2D technical work is in the frequency range of cellular system, even if D2D
Communication distance between user increases, it is also ensured that communicates the interference very little being subject to.Relaying technique is flexible because of its low cost and height
Degree is widely used in 4G cellular system, and relaying technique is quoted in D2D communication system it is possible to prevente effectively from channel declines
Signal interruption when falling improves transmission reliability, while can expand communication range, increases system maximum achievable rate.
There are the selections between conventional cellular communication mode and D2D communication pattern in traditional communication systems.In order to
Transmission rate and diversity gain are maximized, it is most important to reasonably select transmission mode in systems.
Summary of the invention
The purpose of the present invention is to provide the D2D communication transmission mode switching methods between a kind of cellular cell based on relaying.
To realize the above-mentioned technical purpose, the present invention adopts the following technical scheme:
D2D communication transmission mode switching method based on relaying between a kind of cellular cell, the cellular system that this method is related to
To there is the neighboring community to cross, there are a base station, a phone user, a D2D user in each cell, cell intersection has
One trunk subscriber；
The communication transmission mode of the cellular system includes traditional D2D communication pattern, the D2D communication pattern based on AF relaying
With the D2D communication pattern relayed based on DF；
The switching method of the communication transmission mode are as follows: complete to obtain in several time slots once communicated in a pair of of D2D user
The transmission power and link-state information for taking three kinds of communication transmission modes obtain the closure expression of link maximum achievable rate
Maximum achievable rate between mode is compared by formula, selects to make the maximum transmission mode of the total achievable rate of cellular system most
Excellent transmission mode carries out dynamic pattern switching.
Further, the switching method of the communication transmission mode includes:
By traditional D2D communication pattern, it is denoted as mode A；D2D communication pattern based on AF relaying is denoted as B-mode；Based in DF
After D2D communication pattern be denoted as C mode；
It completes to obtain the transmission power of three kinds of communication transmission modes in several time slots once communicated in a pair of of D2D user
And link-state information, calculate the reception Signal to Interference plus Noise Ratio SINR of each link；
Based on Signal to Interference plus Noise Ratio SINR, the maximum achievable rate under Three models is calculated using the varying type of shannon formula；
Mode A, B-mode, the maximum achievable rate of C mode between any two are compared, respectively acquisition A, B-mode, B, C mode,
A, critical point when C mode switches, i.e. threshold value YAB、YBCAnd YAC；
Assuming that D2D user to the distance between trunk subscriber be dDR, compare the distance dDRWith threshold value YAB、YBCAnd YAC, choosing
Selecting makes the cellular system always maximum transmission mode optimal transmission mode of maximum achievable rate；
Further, based on base station under Three models, phone user, D2D user, trunk subscriber transmission power attenuation feelings
Condition calculates the reception Signal to Interference plus Noise Ratio SINR of each link.Its calculation are as follows:
Trunk subscriber after D2D user after decaying to be sent to power and decaying, which sends power and analogizes to, to be an actually-received
Useful signal intensity, the base station after decaying always send power, and the phone user after decaying always sends power and noise analogizes to reality
The interference signal that border receives, then practical received useful signal intensity and the interference signal intensity and noise that are an actually-received it
The ratio of sum is the reception Signal to Interference plus Noise Ratio SINR of link；
Wherein, it is total for the base-station transmitting-power after this cell and neighboring community's decaying always to send power for the base station after decaying
With；It is that the phone user after this cell and neighboring community's decaying sends power summation that phone user after decaying, which always sends power,.
Further, since the communication of D2D user a pair of of under C mode needs to undergo the chain in two time slots and two time slots
Line state is different, and link maximum achievable rate need to take the smaller value in two time slots in C mode；
Further, link is divided into a plurality of single link by communication process, and the varying type for thus obtaining shannon formula is as follows:
C is channel capacity in formula, and B is channel width, and R is the capacity of unit bandwidth, the i.e. maximum achievable rate of link.
Further, since transmission total time is limited, relay transmission needs complete a D2D user's in 4 time slots
Information exchange, and base station and phone user can complete information exchange twice in 4 time slots, therefore the maximum of each link is reachable
Rate can be collectively indicated as
Further, the expression formula of the maximum achievable rate obtained in above content is complex, is not easy to calculate, therefore root
Simplified according to Jensen inequality E [log (1+x)]≤log (1+E [x]).Each link channel coefficient can be approximately equal, receives
The channel coefficients of transmission power in Signal to Interference plus Noise Ratio (SINR) expression formula after all decaying are negligible, obtain eliminating it is unrelated because
Element facilitates the maximum achievable rate expression formula of calculating.
Further, by A, B-mode, B, C mode, A, C mode maximum achievable rate make the difference compare respectively, obtaining mode
Critical point when switching.
Further, D2D user is compared to the distance d between trunk subscriberDRWith threshold value YAB、YBCAnd YAC, dDR< YAB, then select
B-mode is selected to be transmitted；If YAB< dDR< YBC, then mode A is selected to be transmitted；Otherwise selection C mode is transmitted.
Method communication transmission mode of the invention include traditional D2D communication pattern, based on AF relaying D2D communication pattern and
Based on the D2D communication pattern of DF relaying, pattern switching is carried out based on link maximum achievable rate；Mode switching manner is complicated for operation
It spends low.It, can be to select optimal transmission mode to pass for D2D user by by the threshold value comparison of the parameter selected and setting
It is defeated.Wherein threshold value is obtained by theory solution, has certain reliability；In addition, method of the invention can be utilized fully
The information of link can be reasonably selected according to the dynamic change of link state, adaptable, and the reachable total of system can be improved
The utilization rate of rate and cell resource.
Detailed description of the invention
Fig. 1 is the flow chart of transmission time slot division and operating procedure in the method for the present invention；
Fig. 2 is the flow chart of the method for the present invention module switching mode.
Specific embodiment
Below with reference to specific embodiment, theory of the invention is further illustrated.It should be understood that these embodiments are only used for
Use scope bright of the invention rather than that limitation is of the invention, after having understood the present invention, this field researcher is to the present invention
The modifications of various equivalent forms need to fall in the application range as defined in the appended claims.
D2D communication transmission mode switching method between cellular cell based on relaying, as shown in Figure 1, the specific steps are as follows:
Step 101: in transmission time slot 1, D2D user is transmitted under current transmission mode；
Step 102: at the end of transmission time slot 1, D2D user carries out the selection of transmission mode.Three kinds of communication moulds are analyzed respectively
Power attenuation situation is sent under formula, the D2D user after being decayed sends power PD, trunk subscriber after decaying sends power PR,
Base station after decaying always sends power ∑ PB, the phone user after decaying always sends power ∑ PCAnd noise N0, derive each link
Reception Signal to Interference plus Noise Ratio (SINR) expression formula；
Wherein, the D2D user after decaying sends power PDPower P is sent with the trunk subscriber after decayingRReality can be analogized to
It connects and noise N0The interference signal being an actually-received can be analogized to.Therefore, practical received useful signal intensity and practical reception
To interference signal intensity and the sum of noise ratio be link reception Signal to Interference plus Noise Ratio (SINR) expression formula, i.e. following formula:
Wherein, it is total for the base-station transmitting-power after this cell and neighboring community's decaying always to send power for the base station after decaying
With calculation is as follows:
Phone user after decaying always sends power, is that the phone user after this cell and neighboring community's decaying sends power
Summation, calculation are as follows:
In formula, P in formulaBTFor base-station transmitting-power, PCTPower, C are sent for phone user1、C2It is this cell and phase respectively
Adjacent cell cellular user terminal, B1、B2It is the base station terminal of this cell and neighboring community respectively, 1,2 be D2D user terminal respectively,
dij(i, j=Bk,Ck,1,2,R；I ≠ j, k=1,2) it is distance of the terminal i to terminal j, α is channel fading coefficient (constant), hij
(i, j=Bk,Ck,1,2,R；I ≠ j, k=1,2) be i-j link channel coefficients；
Step 103: being obtained according to step 102 reception Signal to Interference plus Noise Ratio expression formula obtained in conjunction with the varying type of shannon formula
Maximum achievable rate expression formula under to Three models；
Since link is divided into a plurality of single link, shannon formula C=B*log by communication process2(1+SINR) variation are as follows:
C is channel capacity in formula, and B is channel width, and R is the capacity of unit bandwidth, the i.e. maximum achievable rate of link.
Obtain the maximum achievable rate expression formula of unit link under three kinds of D2D communication patterns；Wherein, due to transmitting total time
Limited, relay transmission needs to complete the information exchange of a D2D user in 4 time slots, and base station and phone user are at 4
Information exchange twice can be completed in gap, therefore the maximum achievable rate of each link can be concentrated and is expressed as follows:
Since the communication of D2D user a pair of of under C mode needs to undergo the link state in two time slots and two time slots not
Together, link maximum achievable rate need to take the smaller value in two time slots in C mode, and the base station after decaying in step 1 is always sent
Power ∑ PBPower ∑ P is always sent with the phone user after decayingCIt is compared, determines the link maximum achievable rate table of C mode
Up to formula；
According to Jensen inequality E [log (1+x)]≤log (1+E [x]), simplify above-mentioned maximum achievable rate expression formula.
According to Jensen inequality, and each link channel coefficient can be approximately equal, receives all decaying in Signal to Interference plus Noise Ratio SINR expression formula
The channel coefficients of transmission power afterwards are negligible, obtain eliminating maximum achievable rate under final Three models after irrelevant factor
Expression formula；
Step 104: to make system, always maximum achievable rate is maximized, and the maximum achievable rate of different mode is compared, is obtained
To the critical point of distance when switching between mode, i.e. threshold value, obtaining next time slot keeps the total achievable rate of cellular system maximum optimal
Transmission mode, as shown in Figure 2.
It, can be directly than serious since the maximum achievable rate expression formula of Three models is indicated in the form of same bottom logarithm
Number, the i.e. size of (1+SINR).Achievable rate maximum between both of which is made the difference and is compared, is obtained about dDROne- place 2-th Order differ
Formula enables this inequality be equal to 0, solves critical point, i.e. threshold value.It carries out the maximum achievable rate of mode A and B-mode to make the difference ratio
Compared with d when obtaining switching between A, B-modeDRCritical point, i.e. threshold value YAB, i.e. mode switch points of mode A and B-mode；By B-mode
Make the difference comparing with the maximum achievable rate of C mode, d when obtaining switching between B, C modeDRCritical point, i.e. threshold value YBC, i.e. B
The mode switch points of mode and C mode；The maximum achievable rate of mode A and C mode make the difference comparing, obtains A, C mode
Between switch when dDRCritical point, i.e. threshold value YAC, i.e. mode switch points of mode A and C mode；
By D2D user to the distance parameter d between trunk subscriberDRCompared with the threshold value being calculated in step 4, selection
Make the maximum optimal transmission mode of the total achievable rate of cellular system；
If dDR< YAB, then B-mode is selected to be transmitted；If YAB< dDR< YBC, then mode A is selected to be transmitted；
Otherwise selection C mode is transmitted.
Step 105: after obtaining the optimal transmission mode of next transmission time slot, into transmission time slot 2, D2D user is optimal
It is transmitted under transmission mode.
Claims (10)
1. the D2D communication transmission mode switching method between a kind of cellular cell based on relaying, it is characterised in that: what this method was related to
Cellular system is to have the neighboring community to cross, there is a base station, a phone user, a D2D user, cell in each cell
There is a trunk subscriber in intersection；
The communication transmission mode of the cellular system includes traditional D2D communication pattern, D2D communication pattern and base based on AF relaying
In the D2D communication pattern of DF relaying；
The switching method of the communication transmission mode are as follows: completed in several time slots once communicated in a pair of of D2D user, obtain institute
The transmission power and link-state information for stating three kinds of communication transmission modes, obtain the closure expression formula of link maximum achievable rate,
Maximum achievable rate between mode is compared, selects to make the optimal biography of the maximum transmission mode of the total achievable rate of cellular system
Defeated mode carries out dynamic pattern switching.
2. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 1 based on relaying, special
Sign is that the switching method of the communication transmission mode includes:
By traditional D2D communication pattern, it is denoted as mode A；D2D communication pattern based on AF relaying is denoted as B-mode；Based on DF relaying
D2D communication pattern is denoted as C mode；
It completes to obtain the transmission power and chain of three kinds of communication transmission modes in several time slots once communicated in a pair of of D2D user
Line state information calculates the reception Signal to Interference plus Noise Ratio SINR of each link；
Based on Signal to Interference plus Noise Ratio SINR, the maximum achievable rate under Three models is calculated using the varying type of shannon formula；
Mode A, B-mode, the maximum achievable rate of C mode between any two are compared, obtains A, B-mode, B, C mode, A, C mould respectively
Critical point when formula switches, i.e. threshold value YAB、YBCAnd YAC；
Assuming that D2D user to the distance between trunk subscriber be dDR, compare the distance dDRWith threshold value YAB、YBCAnd YAC, select to make bee
Always the maximum maximum transmission mode of achievable rate is optimal transmission mode to nest system.
3. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 1 based on relaying, special
Sign is, based on base station under Three models, phone user, D2D user, trunk subscriber transmission power attenuation situation, calculate each
The reception Signal to Interference plus Noise Ratio SINR of link.
4. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 2 or 3 based on relaying,
It is characterized in that, receiving the calculation of Signal to Interference plus Noise Ratio SINR are as follows:
It obtains the D2D user after decaying under three kinds of communication patterns and sends power, the trunk subscriber after decaying sends power, after decaying
Base station always send power, the phone user after decaying always sends power and noise；
By after decaying D2D user send power and decaying after trunk subscriber send power analogize to be an actually-received it is useful
Signal strength, the base station after decaying always send power, and the phone user after decaying always sends power and noise is analogized to and actually connect
The interference signal received, then practical received useful signal intensity and the interference signal intensity and the sum of noise that are an actually-received
Ratio is the reception Signal to Interference plus Noise Ratio SINR of link；
Wherein, it is the base-station transmitting-power summation after this cell and neighboring community's decaying that the base station after decaying, which always sends power,；It declines
It is that the phone user after this cell and neighboring community's decaying sends power summation that phone user after subtracting, which always sends power,.
5. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 2 based on relaying, special
Sign is, in C mode, link maximum achievable rate takes the smaller value in two time slots.
6. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 2 based on relaying, special
Sign is that link is divided into a plurality of single link by communication process, and the varying type for thus obtaining shannon formula is as follows:
C is channel capacity in formula, and B is channel width, and R is the capacity of unit bandwidth, the i.e. maximum achievable rate of link.
7. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 6 based on relaying, special
Sign is, the maximum achievable rate concentration of link is expressed as follows:
8. being cut according to the D2D communication transmission mode based on relaying between a kind of described in any item cellular cells of claim 2,6,7
Change method, which is characterized in that the method also includes: it is obtained most according to Jensen inequality to based on shannon formula varying type
Big achievable rate expression formula is simplified.
9. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 2 based on relaying, special
Sign is, by A, B-mode, B, C mode, A, C mode maximum achievable rate make the difference compare respectively, facing when obtaining mode switches
Boundary's point.
10. the D2D communication transmission mode switching method between a kind of cellular cell according to claim 2 based on relaying,
It is characterized in that, comparison D2D user to the distance d between trunk subscriberDRWith threshold value YAB、YBCAnd YAC, dDR< YAB, then B-mode is selected
It is transmitted；If YAB< dDR< YBC, then mode A is selected to be transmitted；Otherwise selection C mode is transmitted.
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