CN103298141A - Carrier multiplexing method for device-to-device (D2D) communication in cellular and D2D hybrid network - Google Patents
Carrier multiplexing method for device-to-device (D2D) communication in cellular and D2D hybrid network Download PDFInfo
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Abstract
A carrier multiplexing method for D2D communication in a cellular and D2D hybrid network comprises the operating steps that (1), an evolved node B (eNB) acquires frequencies and bandwidth information of all available component carriers (CCs) of an operator to which the eNB belongs; (2), the eNB acquires undistributed CC information and sends the undistributed CC information to D2D user equipment (UE); and (3), the D2D UE measures the received undistributed CC information to determine spectrum resources capable of being multiplexed. According to the carrier multiplexing method, resource multiplexing can be achieved effectively, the D2D UE can multiplex undistributed CCs no matter the D2D UE is used in uplink or downlink transmission, and interference between cellular and D2D communication can be avoided. Therefore, the carrier multiplexing method is provided with good popularization and application prospect.
Description
Technical field
The present invention relates to a kind of carrier multiplexing method of D2D communication, exactly, relate to a kind of and long-term evolution upgrading LTE-A(Long Term Evolution-Advanced) honeycomb and the straight-through D2D(Device-to-device of terminal) D2D communicates by letter in the hybrid network carrier multiplexing method, belong to technical field of wireless communication.
Background technology
Referring to Fig. 1, introduce the hybrid network application scenarios that comprises LTE-A honeycomb mode and D2D pattern.User terminal UE(User equipment) can two kinds of different patterns communicate: cellular communication pattern and D2D communication pattern.In the cellular communication pattern, honeycomb UE is by evolved base station eNB(Evolved Node B) and other UE communicate.The main advantage of honeycomb mode is to have central authorities' control, is easy to control resource distribution and interference.Yet the remarkable defective of this pattern is effectively to utilize Radio Resource.And under the D2D communication pattern, UE directly communicates by letter with another UE and does not have central authorities' control.The advantage of D2D communication is to use resource flexibly, and still, it is very difficult that D2D UE goes for complete resource allocation information.
In hybrid network, the key of problem is how Resources allocation is controlled with realizing disturbing.
In the prior art, select for the residential quarter selection/reselection, eNB is the available member carrier CC(component carrier that broadcasts all the other contiguous eNB to its UE) information.And UE should keep an available CC information list, for hand-off process.Yet because D2D UE can not obtain reusable carrier wave by the assignment information of CC, this mechanism also is not suitable for D2D communication discovery recoverable resources.
Know according to the retrieval still how not utilize carrier aggregation CA(carrier aggregation about D2D communication in the cellular network at present) scheme of characteristic multiplexed resource.
Consider the D2D communication in the cellular network, when the resource of the multiplexing honeycomb UE of D2D UE, key technology is how to seek reusable resource, thereby reduces or avoid interference between honeycomb UE and the D2D UE.
Usually, D2D UE is can be multiplexing temporary transient unoccupied or be in the cell resource of specific geographical area.But above-mentioned two kinds of multiplex modes may cause the interference between D2D UE and the honeycomb UE.Its reason is:
(1) when D2D UE by broadcast message know/during current not being used of some frequency spectrum resource of perception, its needs quite complicated operating mechanism determine the duration that D2D communicates by letter and keeps.Otherwise when honeycomb UE reused this section resource, D2D UE will bear the interference from D2D UE; Vice versa.
(2) when there is the frequency spectrum resource that is not used in D2D UE perception/know specific geographical area, autonomous D2D UE does not know the distance of itself and honeycomb UE, does not know the accumulated interference that honeycomb UE bears yet.Carry out D2D communication if they arrange specific parameter (as power), honeycomb UE may be interfered.
The LTE-A system uses the CA technology to improve bandwidth.Operator may have many CC.Yet operator can't distribute to each eNB with its all CC.Because the restriction of demand for services and hardware resource, operator only gives eNB distribution portion CC.Therefore, in specific geographic area, there is the CC that belongs to certain operator but do not distribute to this eNB.D2D UE can use these CC easily.This be because: the first, no matter CC is for up link or down link, D2D UE can multiplexing these CC.The second because CC is not assigned with, D2D UE multiplexing these CC when and where no matter, honeycomb with can not produce interference between D2D communicates by letter.
Reasonably interference should be able to be effectively handled in the resource distribution.For hybrid network, how managing radio resources is multiplexing is an important problem very to avoid interference.How to use unappropriated frequency spectrum resource in the LTE-A system, distribute use as the feasible resource in D2D and the honeycomb hybrid network, just become the new problem that the present invention need solve.
Summary of the invention
In view of this, the purpose of this invention is to provide the carrier multiplexing method that a kind of honeycomb is communicated by letter with D2D in the straight-through hybrid network of terminal, in order to realize resource multiplex, and the interference between avoiding cellular communication and D2D communicating by letter.
In order to achieve the above object, the invention provides a kind of honeycomb and the carrier multiplexing method that D2D in the straight-through hybrid network of terminal communicates by letter, it is characterized in that described method comprises following operating procedure:
(1) evolved base station eNB(Evolved Node B) obtain all available member carrier CC(component carrier of its operator) frequency and bandwidth information;
(2) eNB obtains the CC information be not assigned with, and sends the CC information that this is not assigned with to D2D UE;
(3) D2D UE carries out the CC information of receiving, that be not assigned with and measures operation, to determine its reusable frequency spectrum resource.
In the described step (1), eNB obtains the CC of operator information following dual mode:
(A) eNB is by the O﹠amp of operation maintenance center; M(Operation and Maintenance) acquired information: after disposing eNB, O﹠amp; M directly sends the CC of operator information by the predefined setting form of agreement to eNB, and at O﹠amp; When M upgrades CC information, also send and its relevant information to eNB;
(B) if O﹠amp; M can not provide this CC information, and then eNB is by the CC information of X2 interface and other eNB exchange distribution; Therefore the CC information that the eNB the time obtains by exchange may be less than whole CC information that operator has, so eNB regards the CC information maximum set of its acquisition as complete or collected works.
Described step (2) comprises following content of operation:
(21) eNB has distributed the CC information of use by X2 interface and contiguous eNB exchange;
(22) eNB will distribute the CC information of use and all CC information of operator or the CC information maximum set of acquisition to compare, and the supplementary set of the CC that has been distributed is namely confirmed the CC information that is not assigned with;
(23) eNB is broadcast to D2D UE with the CC information that this is not assigned with, and is used for helping D2D UE to find the reusable carrier wave.
In the described step (23), eNB wants to distinguish the CC that is not assigned with that wherein belongs to eNB oneself and contiguous eNB respectively to the CC information that is not assigned with of D2D UE broadcasting.
Described step (3) comprises following content of operation:
(31) D2D UE selects for use agreement to determine in advance or by the multiple detection method of eNB broadcast announcement, measure and add up it to the distance between each eNB, to determine whether it is in cell edge, and make corresponding judgement according to decision rule: if D2D UE is in cell edge, execution in step (32) then; Otherwise, redirect execution in step (33); So that the multiplexing CC that these are not assigned with of its energy, and can not produce interference to honeycomb UE;
(32) D2D UE with the common factor that is not assigned with CC of the eNB of this residential quarter and contiguous eNB as the reusable carrier wave;
(33) D2D UE is not assigned with CC as its reusable frequency spectrum resource with this residential quarter eNB.
In the described step (31), one of described multiple detection method is the signal power strength of measuring from each eNB, judges whether the signal power strength that receives is lower than setting threshold: P
RX≤ λ is if judge that then it is in cell edge; If not, judge that then it is not in cell edge; In the formula, P
RXWith λ be respectively the received power of signal and its setting threshold.
The advantage of innovative technology of the present invention with effect is: the invention provides the communicate by letter method of reusable unallocated carrier wave of a kind of definite D2D, because unappropriated carrier wave is not to be the resource of leaving unused, so utilize the inventive method just can realize resource multiplex effectively.And no matter CC is used for upstream or downstream, D2D UE all reusable they.Because CC is not assigned with, D2D UE multiplexing these CC when and where no matter, honeycomb with can not produce interference between D2D communicates by letter.Therefore, the user that the present invention can provide experiences, and has good popularization and application prospect.
Description of drawings
Fig. 1 is that the straight-through mixed network structure of the inventive method application scenarios-honeycomb and terminal is formed schematic diagram.
Fig. 2 is the carrier multiplexing method operating procedure flow chart of D2D communication in the hybrid network of the present invention.
Fig. 3 is that eNB is by the schematic diagram of X2 interface and other eNB exchange CC information.
Fig. 4 is that eNB is to the schematic diagram of D2D UE broadcast message.
Fig. 5 is mutual signaling process and the main operational steps sequential chart of the inventive method.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples.
The inventive method application scenarios is: D2D UE can communicate by letter with eNB.Its problem to be solved is: in hybrid network, and the interference that solution D2D communicates by letter multiplexing unappropriated carrier wave and avoids D2D to communicate by letter and produce.
Referring to Fig. 2 and Fig. 5, introduce concrete operations step and the sequential thereof of the carrier multiplexing method that D2D communicates by letter in the straight-through hybrid network of honeycomb of the present invention and terminal:
Step 1, evolved base station eNB obtains frequency and the bandwidth information of all available member carrier CC of its operator.
In order to provide bigger bandwidth to improve message transmission rate, the LTE-A system has adopted the CA technology.For the UE that can use CA, the CC that is not assigned with that belongs to operator can be used for D2D communication.Because these CC are not assigned to eNB, multiplexing these carrier waves of D2D UE can not produce honeycomb UE and disturb.
Therefore, eNB at first should obtain all CC information of operator.
In order to help D2D UE to measure, and determine reusable carrier wave, the information of all CC should include but not limited to frequency and the bandwidth of CC.In this step, eNB obtains the CC of operator information following dual mode:
(A) eNB is by the O﹠amp of operation maintenance center; The M acquired information.
After disposing eNB, O﹠amp; M directly sends the CC of operator information by the predefined setting form of agreement (example is as shown in table 1) to eNB, and at O﹠amp; When M upgrades CC information, also send and its relevant information to eNB.
A kind of format sample of table 1CC information
| CC number | The working band bandwidth | The CC centre frequency | FDD/TDD | UL or DL |
| 1 | B w | f c | FDD | DL |
Annotate: Frequency Division Duplexing (FDD) (frequency division duplexing, FDD), time division duplex (time division duplexing, TDD), up (Uplink, UL), descending (downlink, DL).
(B) if O﹠amp; M can not provide this CC information, and then eNB is by the CC information (its process as shown in Figure 3) of X2 interface and other eNB exchange distribution; The CC information that obtains by exchange because of eNB may be less than whole CC information that operator has, so eNB regards the CC information maximum set of its acquisition as complete or collected works.A kind of possible form and the table 1 of exchange message are similar.
Referring to shown in Figure 3, operator has CC1, CC2, CC3, CC4 and CC5, it distributes to eNB1, the CC of eNB2 and eNB3 be respectively (CC1, CC2, CC4), (CC1, CC2, CC3) and (CC1, CC4, CC5).ENB1 can exchange the CC information of distributing separately with eNB2 and eNB3 respectively by X2 interface.Therefore it has obtained the CC information of three eNB, and namely (CC1, CC2, CC3, CC4, CC5).
In above-mentioned example, eNB1 can obtain all CC information that operator has by exchange message.Yet, have the situation that CC information that eNB1 obtains by exchange message is less than whole CC information that operator has equally.ENB was fated obtainable maximum CC information set and was complete or collected works this moment.
Step 2, eNB obtains the CC information be not assigned with, and sends the CC information that this is not assigned with to D2D UE.This step comprises following content of operation:
(21) eNB has distributed the CC information of use by X2 interface and contiguous eNB exchange;
(22) eNB will distribute the CC information of use and all CC information of operator or the CC information maximum set of acquisition to compare, and the supplementary set of the CC that has been distributed is namely confirmed the CC information that is not assigned with;
(23) eNB is broadcast to D2D UE with the CC information that this is not assigned with, and is used for helping D2D UE to find the reusable carrier wave.And, in the CC information that is not assigned with of D2D UE broadcasting, to distinguish the CC that is not assigned with that wherein belongs to eNB oneself and contiguous eNB respectively at eNB.
Referring to Fig. 4, introduce the CC information that this step (23): eNB obtains not to be assigned with after, adopt multiple form that it is broadcast to D2D UE.In order to help D2D UE to find the reusable carrier wave, need distinguish the unallocated CC of eNB oneself and contiguous eNB.Table 2 is listed a kind of example.
The format sample of table 2CC information
| CC number | The working band bandwidth | The CC centre frequency | FDD/TDD | UL or DL | eNB |
| 1 | B w1 | f c1 | FDD | DL | 1 |
| 2 | B w2 | f c2 | FDD | UL | 1 |
| 3 | B w3 | f c3 | FDD | DL | 2 |
Wherein, B
W1, B
W2, B
W3The bandwidth of representing CC1, CC2, CC3 respectively, f
C1, f
C2, f
C3The centre frequency of representing CC1, CC2, CC3 respectively.
Step 3, D2D UE carries out the CC information of receiving, that be not assigned with and measures operation, to determine its reusable frequency spectrum resource.This step comprises following content of operation:
D2D UE selects for use agreement to determine in advance or by the multiple detection method of eNB broadcast announcement, measures and add up it to the distance between each eNB, whether is in cell edge to determine it, and makes corresponding judgement according to decision rule:
If D2D UE is in cell edge, then carry out following step: D2D UE with the common factor that is not assigned with CC of the eNB of this residential quarter and contiguous eNB as the reusable carrier wave.
If D2D UE is not in cell edge, then with this residential quarter eNB be not assigned with CC as its reusable frequency spectrum resource so that can the multiplexing CC that these are not assigned with, and honeycomb UE not be produced and disturbs.
For example, one of multiple detection method is the signal power strength of measuring from each eNB, judges whether the signal power strength that receives is lower than setting threshold: P
RX≤ λ is if judge that then it is in cell edge; If not, judge that then it is not in cell edge; In the formula, P
RXWith λ be respectively the received power of signal and its setting threshold.
Claims (6)
1. a honeycomb leads directly to the carrier multiplexing method that D2D communicates by letter in the hybrid network with terminal, it is characterized in that described method comprises following operating procedure:
(1) evolved base station eNB obtains frequency and the bandwidth information of all available member carrier CC of its operator;
(2) eNB obtains the CC information be not assigned with, and sends the CC information that this is not assigned with to D2D UE;
(3) D2D UE carries out the CC that receives, be not assigned with and measures operation, to determine its reusable frequency spectrum resource.
2. method according to claim 1 is characterized in that, in the described step (1), eNB obtains the CC of operator information following dual mode:
(A) eNB is by the O﹠amp of operation maintenance center; The M acquired information: after disposing eNB, O﹠amp; M directly sends the CC of operator information by the predefined setting form of agreement to eNB, and at O﹠amp; When M upgrades CC information, also send and its relevant information to eNB;
(B) if O﹠amp; M can not provide this CC information, and then eNB is by the CC information of X2 interface and other eNB exchange distribution; Therefore the CC information that the eNB the time obtains by exchange may be less than whole CC information that operator has, so eNB regards the CC information maximum set of its acquisition as complete or collected works.
3. method according to claim 1 is characterized in that, described step (2) comprises following content of operation:
(21) eNB has distributed the CC information of use by X2 interface and contiguous eNB exchange;
(22) eNB will distribute the CC information of use and all CC information of operator or the CC information maximum set of acquisition to compare, and the supplementary set of the CC that has been distributed is namely confirmed the CC information that is not assigned with;
(23) eNB is broadcast to D2D UE with the CC information that this is not assigned with, and is used for helping D2D UE to find the reusable carrier wave.
4. method according to claim 3 is characterized in that: in the described step (23), eNB wants to distinguish for the CC information that is not assigned with of D2D UE broadcasting wherein to belong to respectively the CC that is not assigned with of eNB oneself and vicinity eNB.
5. method according to claim 1 is characterized in that, described step (3) comprises following content of operation:
(31) D2D UE selects for use agreement to determine in advance or by the multiple detection method of eNB broadcast announcement, measure and add up it to the distance between each eNB, to determine whether it is in cell edge, and make corresponding judgement according to decision rule: if D2D UE is in cell edge, execution in step (32) then; Otherwise, redirect execution in step (33); So that the multiplexing CC that these are not assigned with of its energy, and can not produce interference to honeycomb UE;
(32) D2D UE with the common factor that is not assigned with CC of the eNB of this residential quarter and contiguous eNB as the reusable carrier wave;
(33) D2D UE is not assigned with CC as its reusable frequency spectrum resource with this residential quarter eNB.
6. method according to claim 5 is characterized in that, in the described step (31), one of described multiple detection method is the signal power strength of measuring from each eNB, judges whether the signal power strength that receives is lower than setting threshold: P
RX≤ λ is if judge that then it is in cell edge; If not, judge that then it is not in cell edge; In the formula, P
RXWith λ be respectively the received power of signal and its setting threshold.
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