CN102244873A - Method for selecting resource multiplexing modes for D2D (Device-to-Device) user pair and cellular user based on position of D2D user pair - Google Patents
Method for selecting resource multiplexing modes for D2D (Device-to-Device) user pair and cellular user based on position of D2D user pair Download PDFInfo
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Abstract
The invention provides a technical scheme to be applied to a mobile communication cellular network, wherein a D2D (Device-to-Device) technology is applied to the cellular network so as to allow the communication between a D2D user pair by multiplexing resources of a cellular network user. The invention provides a method for selecting resource multiplexing modes for the D2D user pair and the cellular user based on the position of the D2D user pair. The method comprises the step of selecting an optimal resource multiplexing mode under the current scene according to the position of each pair of the D2D users so as to perform data transmission. In the scheme provided by the invention, the algorithm complexity for selecting the resource multiplexing modes for the D2D user pair and the cellular user by a base station is simplified; and the interference between the D2D user pair and the cellular user is effectively controlled. The method disclosed by the invention has strong practical operability, is easy to realize in practice, and has more flexible application manners.
Description
Technical field
The present invention be with end-to-end (Device-to-Device, D2D) technology is applied to cellular network, D2D user communicates the resource of user in the multiplexing cellular network.Or other and in cellular network, use the communication network that the D2D technology has similar architected features.The present invention proposes a kind of is the method that itself and phone user select the resource multiplex pattern based on the right position of D2D user, and it can effectively simplify the complexity of base station selected resource multiplex pattern algorithm in the cellular network that has D2D communication.And under the condition that guarantees the minimum traffic rate of phone user, improve the spectrum efficiency of entire system (comprise cellular communication communicate by letter) with D2D.The method that the present invention proposes has very strong actual operability.
Background technology
It is end-to-end that (Device-to-Device, D2D) communication is a kind of under the control of cellular system, allows the new technique that directly communicates by multiplexing intra-cell resource between the terminal.Thereby it have improve the system spectrum utilance, reduce end cell consumption save travelling carriage power, lower cellular base stations load, improve the system user fairness, improve wireless network QoS, consolidate understructure, new advantages such as service be provided.And can solve the problem of wireless communication system frequency spectrum resource scarcity to a certain extent.D2D communication is to be operated in licensed band in Cellular Networks, and it has lot of advantages with respect to other technology (as bluetooth, WLAN etc.) that is operated in non-licensed band.Have only licensed band can guarantee to provide and disturb controlled, stable communication environment, but not the service instability that licensed band provides, this is very important to quality of service requirement high business or specific user.
D2D communication under cellular architecture is by sharing the lifting that local resource reaches the entire system performance.When if the D2D allocation of communications arrives the channel resource of quadrature, it can not form the communication in the original cellular network and disturb.If when D2D communication was assigned to non-orthogonal channel resource, D2D communication will cause interference to the receiving terminal in the cellular link.In the less network of traffic load, can be the resource of the unnecessary quadrature of D2D allocation of communications, obviously like this can obtain better network overall performance.But, because the resource-constrained in the cellular network is considered that communication service is more and more higher to the requirement of frequency bandwidth, and is adopted the mode of nonopiate resource-sharing can make network that the higher level of resources utilization is arranged.This also is a main purpose of using D2D communication in cellular network.
Under nonopiate resource-sharing pattern, can there be multiple resource distribution mode the base station, and they can obtain different performance gains and implementation complexity at last.For example wherein realize the simplest mode, the base station can be selected the resource in the sub-district at random; In addition, the base station chosen distance D2D user that can also try one's best carries out resource-sharing to phone user's far away resource, guarantees to disturb between them as much as possible little like this.At present, D2D communication can come and phone user's shared resource by following three kinds of patterns:
1. base station Transfer Mode: D2D user communicates the switching by cellular network base station.Under this pattern, D2D user is the same with phone user's communication mode.D2D communication independently takies the resource of half, and second half is taken by cellular communication.All communication all divides and is equipped with independently channel resource of quadrature, and transmits with maximum power.This pattern is exactly traditional cellular communication pattern.
2. orthogonal resource shared model: D2D communication is divided resource equally with cellular communication, and the channel resource that independently takies half is directly communicated by letter end to end, and the phone user takies second half channel resource.Under this pattern, can not produce interference between D2D communication and the cellular communication.
3. multiplexing phone user's resource: D2D user will with multiplexing its resource of phone user, can cause interference each other.And cellular basestation is D2D communication and cellular communication distribution through-put power size, coordinates interference each other.
D2D communication can be shared uplink resource or down-chain resource with cellular communication.No matter share for the shared still down link of up link, the mode of system's total data rate maximum can be selected to make in the base station from above three kinds of resource-sharing schemes.Because when up link or down link were shared, the source of interference and size were different, need consider different interference control methods at the base station end in the specific implementation.
Summary of the invention
In the cellular network that D2D communication is arranged, D2D user divides timing to carrying out resource-sharing with the phone user, select the complexity of resource-sharing scheme algorithm in order to reduce the base station end, it is the method that itself and phone user select the resource multiplex pattern based on the right position of D2D user that the present invention proposes a kind of.This method can greatly reduce the implementation complexity of base station end when carrying out resource-sharing, and effectively controlled the interference between the phone user of D2D user couple and its multiplexed resource.Basic principle of the present invention is: means that can repeat to realize by accurate Theory derivation, emulation or test etc. at first, the cellular network that has D2D communication is analyzed, obtained being positioned under the different scenes resource multiplex pattern of the D2D user of zones of different position, sub-district optimum; In the actual scene of correspondence,, determine the pattern of its multiplexing phone user's resource according to the right position of D2D user then based on analysis result before.
What the present invention was primarily aimed at is in the cellular network, exists one or more D2D users right, and they can finish communication by the resource of sharing in the cellular network.Set up departments the system in have N phone user U
1, U
2..., U
N, M is to D2D user (D
1, D
2), (D
3, D
4) ..., (D
2M-1, D
2M).The present invention is D2D user to selecting the adequate resources multiplexer mode, and its concrete steps are:
Step 1: analyses such as theoretical derivation, emulation or test.In the cellular network that has D2D communication, selecting system certain or a plurality of performance parameter are index, analyze with methods such as theoretical derivation, emulation or tests, obtain being positioned under the different scenes resource multiplex pattern of the D2D user of zones of different position, sub-district optimum.
Step 2: determine the right position of D2D user in the real system.The base station can be by global positioning system (Global Position System, GPS) or common base station location algorithm position, perhaps by D2D user to initiatively reporting its position to the base station, perhaps other similar localization method is D2D user right position positions.
Step 3: the resource-sharing pattern of determining D2D user couple and phone user.Based on the analysis result of step 1 and the positional information of step 2, be the resource-sharing pattern of D2D user to definite optimum.
Step 4: the resource-sharing pattern that the base station is determined according to step 3 be phone user and D2D user to Resources allocation, to D2D user to carrying out power division with the phone user.Use suitable power control scheme can further reduce D2D user to and the phone user between interference.
Last D2D user communicates by letter to utilizing the resource that is assigned to finish with power respectively with the phone user.
This is that itself and phone user select the method base station of resource multiplex pattern can effectively reduce the complexity that the base station end is selected the resource-sharing pattern algorithm based on the right position of D2D user, directly can determine optimum resource-sharing pattern according to the right positioning result of D2D user.
Description of drawings
In conjunction with the following drawings and instantiation will be convenient to understand principle of the present invention, step, characteristics and advantage to the detailed description done of invention, in the accompanying drawing:
Fig. 1 is an expression system model of the present invention.
Fig. 2 is the specific embodiments of expression the present invention in real network.
Embodiment
For ease of understanding, the present invention is an example with the D2D communication network under the LTE-A system, illustrate that the D2D technology is applied to cellular network, the base station by the method that the right position of D2D user is positioned come for D2D user to selecting the method for resource multiplex pattern with the phone user.Set up departments the system in 10 phone users are arranged, be respectively U
1, U
2..., U
10Two couples of D2D users are arranged, (D
1, D
2) and (D
3, D
4).Phone user's number here can be different with D2D user's logarithm.The present invention generally is suitable for for the network structure model that all have essential characteristic in this example.These D2D users can directly communicate under the coordination of base station, and D2D user is to the shared network resource of can communicating by letter with macrocellular when communicating by letter.
The base station end is that phone user and D2D user are as follows to the detailed process of determining resource-sharing pattern and resource allocation:
1. analyses such as theoretical derivation, emulation or test.Selecting system entire throughput (comprising macrocellular user and D2D user) is assessed the quality of various resource-sharing patterns as performance index.With methods such as theoretical derivation, emulation or tests the cellular network that has D2D communication is analyzed more various resource-sharing patterns.For the D2D user that is positioned at zones of different position, sub-district under the different scenes to choosing optimum resource multiplex pattern: the D2D user nearest apart from the base station communicates selecting the base station Transfer Mode for use; The D2D user of distant positions is to selecting the orthogonal resource shared model for use slightly; D2D user outward is to choosing the pattern with macrocellular user shared resource again, and far away more apart from base station center, the many more phone users' of optimum resource multiplex mode multiplexing resource.
2. in the cellular network of physical presence D2D communication, the position that D2D user is right is determined by location algorithm in the base station.
3. the base station is according to the analysis result of step 1 and the positioning result of step 2, for each D2D user to choosing optimum resource-sharing pattern.As shown in Figure 2, (D
1, D
2) select the pattern of multiplexing a plurality of phone user's resources, its multiplexing U
2, U
3And U
4The resource of using, (D
3, D
4) the multiplexing unique user U of selection
8The pattern of resource.
The resource-sharing pattern determined according to step 3 of base station be phone user and D2D user to Resources allocation, and carry out power division.
Last D2D user communicates by letter to utilizing the resource that is assigned to finish with power respectively with the phone user.
Here it should be noted that: disturb in order to suppress to greatest extent, if the resource that can set a phone user in practice by a D2D user to multiplexing, then it can not be by other D2D user to multiplexing, and promptly a phone user's resource at most can only be multiplexing by a pair of D2D user.
This shows, it is that D2D user is to selecting the complexity of adequate resources shared model algorithm that this programme can effectively reduce the base station, and the pattern of selecting is to sum up by before theory analysis, emulation or results measured, thus effectively controlled phone user and D2D user between interference.
Comprehensive above the discussion as can be seen the present invention proposes when the D2D technology is applied to cellular network, by the base station to the right location of D2D user come for D2D user to selecting the resource multiplex pattern, the present invention has following characteristics:
1. the base station end is that D2D user is simple to the algorithm of selecting the resource multiplex pattern, only need select good by analysis optimum resource multiplex pattern to the right positioning result of D2D user according to the base station.
2. the D2D user that this system of selection can effectively suppress multiplexed resource to and the phone user between interference, thereby improve the overall system data rate.
3. the method that proposes of the present invention is insensitive to concrete application system and protocol specification, possesses compatibility, and promptly the method that all can utilize the present invention to propose to system like the model class in any invention is therewith carried out transfer of data and shared.
In a word, the present invention is a kind of data transmission technology of new high efficiency, its objective is the raising system spectral efficiency, reduces the complexity of resource multiplex pattern algorithm when increasing the D2D communication reliability, thereby improves the overall performance of mobile communication system.
Claims (7)
- With end-to-end (Device-to-Device, D2D) technology is applied to cellular network, the method for resource multiplex pattern is selected for D2D user and phone user in the base station by the right position of D2D user.
- 2. based on the communication resources such as the network architecture, communication equipment, available launch power and communications band that comprise in the system, at the communication channel of dividing and making up and constitute by the difference of each communication resource, the D2D technology is applied in the cellular network and according to the right position of D2D user come for D2D user to selecting the pattern of resource multiplex with the phone user, can effectively reduce the base station end and select the complexity of resource multiplex pattern algorithm, and suppress the interference between D2D user and the phone user.In this scheme, based on the cellular network model that has D2D communication, according to communicate by letter multiplexing phone user's the principle of resource of D2D, the performing step of the scheme of setting is:Step 1: analyses such as theoretical derivation, emulation or test.In the cellular network that has D2D communication, selecting system certain or a plurality of performance parameter are index, analyze with methods such as theoretical derivation, emulation or tests, obtain being positioned under the different scenes resource multiplex pattern of the D2D user of zones of different position, sub-district optimum.Step 2: determine the right position of D2D user in the real system.The base station can be by global positioning system (Global Position System, GPS) or common base station location algorithm position, perhaps by D2D user to initiatively reporting its position to the base station, perhaps other similar localization method is D2D user right position positions.Step 3: the resource-sharing pattern of determining D2D user couple and phone user.Based on the analysis result of step 1 and the positional information of step 2, be the resource-sharing pattern of D2D user to definite optimum.Step 4: the resource-sharing pattern that the base station is determined according to step 3 be phone user and D2D user to Resources allocation, to D2D user to carrying out power division with the phone user.Use suitable power control scheme can further reduce D2D user to and the phone user between interference.Last D2D user communicates by letter to utilizing the resource that is assigned to finish with power respectively with the phone user.
- 3. be index as the described selecting system of step 1 in the claim 2 certain or a plurality of performance parameter, by the means that can repeat to realize, the methods such as accurate theoretical derivation, emulation or test that include but not limited to are analyzed, and obtain being positioned under the different scenes resource multiplex pattern of the D2D user of zones of different position, sub-district to optimum.The thought, the method that comprise analysis.
- 4. locate the right position of D2D user as the described base station of step 2 in the claim 2 by location algorithm.Comprise and be applied to the network architecture of the present invention and the localization method of the similar network architecture and the storage of relevant position information.Such as but not limited to: can be by global positioning system (Global Position System, GPS) or common base station location algorithm position, perhaps by D2D user to initiatively reporting its position to the base station.
- 5. as definite D2D user as described in the step 3 in the claim 2 couple resource-sharing pattern with the phone user.Based on the analysis result of step 1 and the positional information of step 2, be the resource-sharing pattern of D2D user to definite optimum.Comprise thought, algorithm and the step of selecting the resource multiplex pattern.
- The resource-sharing pattern of determining according to step 3 as the described base station of step 4 in the claim 2 be phone user and D2D user to Resources allocation, to D2D user to carrying out power division with the phone user.The thought, algorithm and the step that comprise the power division that is applied to the network architecture of the present invention and the similar network architecture.
- 7. based on the selection strategy of the resource multiplex pattern of the right position optimum of D2D user, such as but not limited to: the D2D user nearest apart from the base station communicates selecting the base station Transfer Mode for use; The D2D user of distant positions is to selecting the orthogonal resource shared model for use slightly; D2D user outward is to choosing the pattern with macrocellular user shared resource again, and far away more apart from base station center, the many more phone users' of optimum resource multiplex mode multiplexing resource.
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