CN110049541B - Method and device for avoiding D2D interference - Google Patents
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Abstract
The application provides a method and a device for D2D interference avoidance. The invention solves the problem of interference of the cross-cell D2D UE communication, and in one embodiment, the scheme that the D2D sending UE and the uplink sending UE share the same time-frequency resource improves the frequency spectrum utilization rate of the D2D UE communication. Further, the interference of the D2D physical signal to the uplink signal is reduced by controlling the maximum transmission power of the D2D transmitting the UE.
Description
The present application is a divisional application of the following original applications:
application date of the original application: 11/2013, 01/11/month
- -application number of the original application: 201310534394.4
The invention of the original application is named: method and device for avoiding D2D interference
Technical Field
The present invention relates to a scheme for transmission of a Demodulation Reference Signal (DMRS-Demodulation Reference Signal) in Device-to-Device (D2D-Device to Device) communication, and more particularly, to a transmission scheme for interference avoidance based on Long Term Evolution (LTE-Long Term Evolution) D2D.
Background
In a conventional 3GPP-3rd Generation partnership Project (3GPP 3rd Generation Partner Project) Long Term Evolution (LTE-Long Term Evolution) system, two frame structures are defined, namely, a frame structure 1 of a Frequency Division Duplex (FDD-Frequency Division Duplex) system and a frame structure 2 of a Time Division Duplex (TDD-Time Division Duplex) system. The difference between the two is that each subframe of the FDD frame structure is 1 millisecond (ms-millisecond), and the TDD system defines 1-2 special subframes in each frame (10 subframes), and the special subframes are composed of three parts, namely, a Downlink synchronization Time Slot (DwPTS-Downlink Time Slot), a Guard interval (GP-Guard Period), and an Uplink synchronization Time Slot (UpPTS-Uplink Time Slot). The conventional LTE Uplink communication adopts a power Control method to ensure that the received power of an Uplink signal meets the expectation of a base station, taking a Physical Uplink Shared Channel (PUSCH) as an example, if a UE sends a PUSCH and does not send a Physical Uplink Control Channel (PUCCH) in a serving cell c, the transmission power of the UE in a subframe i is:
wherein, PCMAX,c(i) Is the maximum transmit power, MPUSCH,c(i) Is the bandwidth occupied by PUSCH, in units of Physical Resource blocks (PRB-PL Resource Block), PLcIs the downlink path loss, αcIs a path loss compensation factor, PO_PUSCH,cIs a parameter of higher layer signaling adjustment, ΔTF,c(i) Is a transport format-related parameter, fc(i) Is a parameter adjusted by the closed-loop power control signaling
In the conventional 3GPP release, data transmission takes place between a base station and a User Equipment (UE-User Equipment). In 3GPP R12, Device-to-Device (D2D-Device to Device) communication is well established and discussed, an essential feature of D2D is to allow data transmission between UEs. For FDD and TDD systems, the 3GPP reached the conclusion at 73 rd conference (RAN1#73) in the first working group of radio access networks: the UEs in the D2D system are not allowed to transmit and receive simultaneously. Further, to avoid interference of downlink data to D2D communication, the UE occupies the conventional uplink resource, i.e., the uplink frequency band of FDD and the uplink subframe of subframe (TDD) for D2D communication (TDD downlink subframe is to be further discussed). On the RAN1#74bis conference, a multiple access method of SC-FDMA was adopted with respect to subframes of D2D communication.
If the UE(s) of a D2D UE group participating in D2D communication reside in different cells (or part of the UEs are outside the cell coverage), one issue to be addressed is whether the communication of the D2D UE group uses the physical resources of one cell or the resources of multiple cells. Further, how to set the maximum transmit power of the D2D UE also requires a solution.
In order to solve the problems, the invention discloses an interference avoidance scheme in a D2D system.
Disclosure of Invention
The invention discloses a method in User Equipment (UE), which comprises the following steps:
A. determining a first physical resource pool by receiving a first signaling, the first signaling being semi-static signaling
B. Receiving a second signaling or self-determining physical resource S1, the second signaling being UE-specific or UE group-specific signaling
C. Transmitting D2D signals at a transmit power P on the physical resource S1
Wherein the transmission power P does not exceed a first power if the physical resource S1 belongs to a first physical resource pool, and the transmission power P does not exceed a second power if the physical resource S1 belongs to a second physical resource pool, the second physical resource pool being a physical resource which does not overlap with the first physical resource pool or being an empty set.
The D2D signal is either D2D physical layer data or D2D physical layer signaling. As an embodiment, the first physical resource pool is a subset 1 of the uplink physical resources of the camping cell, and the second physical resource pool is a subset 2 of the uplink physical resources of the camping cell. As another embodiment, for a TDD system, the first physical resource pool is subset 1 of uplink subframes of a camped cell, and the second physical resource pool is one downlink subframe of the camped cell (the downlink subframe is configured as uplink in a cell where a receiving UE of D2D signal camps). As another embodiment, the first physical resource pool is subset 1 of the uplink physical resources of the camping cell, and the second physical resource pool is an empty set.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
D. receiving the third signaling determines at least one of:
-a first power
-a second power
Wherein the third signaling is semi-static signaling.
As an embodiment, the third signaling is cell-specific signaling, and is carried by a common Radio Resource control (RRC-Radio Resource control) message. As yet another embodiment, the third signaling is UE-specific or UE group-specific signaling, carried by a proprietary RRC message.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
E. and receiving a fourth signaling to determine a second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
The fourth signaling is sent by the camped base station or D2D UE.
Specifically, according to one aspect of the present invention, it is characterized in that the second physical resource pool is an uplink physical resource except the first physical resource pool.
According to the above aspect of the present invention, the UE can determine the second physical resource without signaling.
In particular, according to one aspect of the invention, it is characterized in that the first physical resource pool is one of:
-K available subframes
-a specific subband S of the K available subframes
Wherein K is 0 or a positive integer.
In particular, according to one aspect of the invention, the first power is a legal maximum transmit power and the second power is not greater than the first power.
For LTE, the legal maximum transmit power law is 23 decibel-milliwatts (dBm).
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
F. and sending a fifth signaling indication to the first physical resource pool.
Specifically, according to one aspect of the present invention, it is characterized in that the D2D signal is transmitted at a time T1-T2, wherein:
-if said physical resource S1 belongs to the first physical resource pool, T1 is the reception time of the synchronization sequence transmitted by the camped cell, T2 is 0.
-if the physical resource S1 belongs to a second physical resource pool, T1 is the reception time of the synchronization sequence transmitted by the neighboring cell, T2 is 0; or T1 is the receiving time of the synchronization sequence transmitted by the camped cell, and T2 is a positive value, a negative value or 0.
The invention discloses a method in a base station, which comprises the following steps:
A. sending a first signaling indication first physical resource pool, the first signaling being semi-static signaling
B. Sending a second signaling indicating physical resources S1, the second signaling being UE-specific or UE group-specific signaling
Wherein if the physical resource S1 belongs to a first physical resource pool, the transmission power P of the D2D UE on the physical resource S1 does not exceed a first power, if the physical resource S1 belongs to a second physical resource pool, the transmission power P does not exceed a second power, the second physical resource pool is a non-overlapping physical resource with the first physical resource pool or is an empty set.
Specifically, according to one aspect of the invention, the method is characterized by further comprising at least one of the following steps:
D. transmitting a third signaling indication of at least one of:
-a first power
-a second power
Wherein the third signaling is semi-static signaling.
E. And sending a fourth signaling to indicate the second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
G. uplink transmission of transmission scheduling signaling scheduling on physical resource S1
H. Receiving uplink data on the physical resource S1
According to the above aspect of the present invention, the D2D physical signal and the uplink physical signal are multiplexed on the physical resource S1, thereby improving the spectrum utilization efficiency.
Specifically, according to one aspect of the present invention, it is characterized in that the second physical resource pool is an uplink physical resource except the first physical resource pool.
In particular, according to one aspect of the invention, it is characterized in that the first physical resource pool is one of:
-K available subframes
-a specific subband S of the K available subframes
Wherein K is 0 or a positive integer.
In particular, according to one aspect of the invention, the first power is a legal maximum transmit power and the second power is not greater than the first power.
The invention discloses a user equipment, which is characterized by comprising:
a first module: determining a first physical resource pool by receiving a first signaling, the first signaling being semi-static signaling
A second module: receiving a second signaling or self-determining physical resource S1, the second signaling being UE-specific or UE group-specific signaling
A third module: transmitting D2D signals at a transmit power P on the physical resource S1
Wherein the transmission power P does not exceed a first power if the physical resource S1 belongs to a first physical resource pool, and the transmission power P does not exceed a second power if the physical resource S1 belongs to a second physical resource pool, the second physical resource pool being a physical resource which does not overlap with the first physical resource pool or being an empty set.
As an embodiment, the above apparatus further comprises at least one of:
a fourth module: receiving the third signaling determines at least one of:
-a first power
-a second power
Wherein the third signaling is semi-static signaling.
A fifth module: and receiving a fourth signaling to determine a second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
The invention discloses a base station device, which is characterized by comprising:
a first module: sending a first signaling indication first physical resource pool, the first signaling being semi-static signaling
A second module: sending a second signaling indicating physical resources S1, the second signaling being UE-specific or UE group-specific signaling
Wherein if the physical resource S1 belongs to a first physical resource pool, the transmission power P of the D2D UE on the physical resource S1 does not exceed a first power, if the physical resource S1 belongs to a second physical resource pool, the transmission power P does not exceed a second power, the second physical resource pool is a non-overlapping physical resource with the first physical resource pool or is an empty set.
As an embodiment, the above apparatus further comprises at least one of:
a third module: transmitting a third signaling indication of at least one of:
-a first power
-a second power
Wherein the third signaling is semi-static signaling.
A fourth module: and sending a fourth signaling to indicate the second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
The invention solves the problem of interference of cross-cell D2D UE communication, and provides a scheme for sharing the same time-frequency resource by the D2D UE and the uplink UE, thereby improving the frequency spectrum utilization rate of D2D UE communication. Further, the interference of the D2D physical signal to the uplink signal is reduced by controlling the maximum transmission power of the D2D transmitting the UE. The invention is compatible with the existing 3GPP conclusion.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 shows a schematic diagram of a transmit D2D signal, according to one embodiment of the invention;
fig. 2 shows a schematic diagram of determining a maximum transmit power and a second physical resource pool according to an embodiment of the invention;
fig. 3 shows a schematic diagram of a D2D UE signaling a second physical resource pool according to an embodiment of the invention;
FIG. 4 illustrates a schematic diagram of a location of a first physical resource pool, according to one embodiment of the invention;
fig. 5 shows a block diagram of a processing means in a user equipment according to an embodiment of the invention;
fig. 6 shows a block diagram of a processing means in a base station apparatus according to an embodiment of the present invention;
Detailed Description
The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.
Example 1
Embodiment 1 illustrates a schematic diagram of transmitting a D2D signal, as shown in fig. 1. In fig. 1, base station B10 is the serving cell for UE U11.
For the base station B10, sending a first signaling indication first physical resource pool in step S101, the first signaling being semi-static signaling; a second signaling indicating physical resources S1 is sent in step S102, the second signaling being UE-specific or UE group-specific signaling.
For the UE U11, receiving a first signaling in step S111 to determine a first physical resource pool, the first signaling being semi-static signaling; receiving a second signaling determination physical resource S1 in step S112, the second signaling being UE-specific or UE group-specific signaling; transmitting a D2D signal at a transmission power P on the physical resource S1 in step S113
Wherein, if the physical resource S1 belongs to the first physical resource pool, the transmission power P does not exceed the first power. If the second physical resource pool is not an empty set and the physical resource S1 belongs to the second physical resource pool, the transmission power P does not exceed a second power, and the second physical resource pool is a physical resource that does not overlap with the first physical resource pool.
As an alternative to embodiment 1, for the base station B10, the step S102 and the second signaling are omitted, i.e. the part indicated by the dashed line in fig. 1; for the UE U11, the physical resource S1 is determined by itself in step S112.
Example 2
Embodiment 2 illustrates a schematic diagram of determining the maximum transmit power and the second physical resource pool, as shown in fig. 2. In fig. 2, base station B12 is the serving cell for UE U13.
For base station B12, a third signaling indication is sent in step S121 to indicate at least one of:
-a first power
-a second power
A fourth signaling indication is sent in step S122 to the second physical resource pool.
For the UE U11, receiving the third signaling in step S131 determines at least one of:
-a first power
-a second power
In step S132, receiving the fourth signaling determines the second physical resource pool.
The third signaling is semi-static signaling, the third signaling is cell-specific or UE group-specific, and the fourth signaling is semi-static signaling or dynamic signaling.
Example 3
Embodiment 3 illustrates a schematic diagram that the D2D UE sends a signaling indication to indicate the second physical resource pool, as shown in fig. 3. In fig. 3, base station B14 is the serving cell for UE U15 and base station B17 is the serving cell for UE U16.
For base station B14, signaling C1 indicating physical resource pool R1 is sent in step S141; for the base station B17, signaling C3 indicating the physical resource pool R2 is sent in step S171.
For UE U15, receiving signaling C1 in step S151 determines physical resource pool R1; signaling C2 is sent in step S152 to indicate the physical resource pool R1.
For UE U16, receiving signaling C3 in step S161 determines physical resource pool R2; receiving the signaling C2 in step S162 determines the physical resource pool R1; self-determination of physical resource S1 in step S163; the D2D signal is transmitted at the transmission power P on the physical resource S1 and at the time T1-T2 in step S164. Wherein, if the physical resource S1 belongs to the physical resource pool R2, the transmission power P does not exceed the first power, that is, 23dBm, T1 is the receiving time of the Primary synchronization sequence (PSS/SSS-Primary/Secondary synchronization sequence) transmitted by the base station B17 at the UE U16, and T2 is 0; if the physical resource S1 belongs to physical resource pool R1, the transmission power P does not exceed the second power (predefined or configured by base station B17), T1 is the receiving time of PSS/SSS transmitted by base station B14, and T2 is 0.
Example 4
Embodiment 4 illustrates a schematic diagram of the location of a first physical resource pool, as shown in fig. 4.
In the FDD system, a D2D UE receives a first signaling to determine a first physical resource pool, wherein the first signaling is semi-static signaling; as shown in the grey identifier in fig. 4(a), the first physical resource pool occupies K subframes of the FDD uplink carrier, where K is the number of subframes included in the first signaling scheduling period divided by 8.
As an alternative to embodiment 4, the D2D UE in the TDD system receives a first signaling to determine a first physical resource pool, where the first signaling is semi-static signaling; the first physical resource pool occupies a sub-band in the 2 nd uplink sub-frame of each frame in the TDD consecutive K frames, as indicated by the grey mark in fig. 4 (b). K is the number of frames contained in the first signaling scheduling period.
Example 5
Embodiment 5 illustrates a block diagram of a processing device in a user equipment, as shown in fig. 5. In fig. 5, the UE processing apparatus 400 is composed of a receiving module 401, a determining module 402, a determining module 403, and a sending module 404.
The receiving module 401 receives a first signaling to determine a first physical resource pool, where the first signaling is a semi-static signaling; the determining module 402 receives or self-determines the physical resource S1 (the dashed arrow indicates that the determining module 402 does not necessarily receive the second signaling), the second signaling being UE-specific or UE group-specific signaling; the determining module 403 receives the signaling to determine the first power. The transmitting module 404 transmits the D2D signal at the transmission power P on the physical resource S1
Wherein the transmission power P does not exceed the first power.
Example 6
Embodiment 6 is a block diagram illustrating a processing apparatus in a base station device, as shown in fig. 6. In fig. 6, the base station processing apparatus 500 includes a transmitting apparatus 501, a transmitting apparatus 502, and a transmitting apparatus 503.
The sending device 501 sends a first signaling to indicate a first physical resource pool, where the first signaling is a semi-static signaling; the transmitting means 502 transmits a second signaling indicating physical resources S1, the second signaling being UE-specific or UE group-specific signaling; the sending means 503 sends signaling indicating at least one of:
-a first power
-a second power
-a second pool of physical resources
Wherein if the physical resource S1 belongs to a first physical resource pool, the transmission power P of the D2D UE on the physical resource S1 does not exceed a first power, if the physical resource S1 belongs to a second physical resource pool, the transmission power P does not exceed a second power, the second physical resource pool is a non-overlapping physical resource with the first physical resource pool or is an empty set.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (18)
1. A method in a user equipment, comprising the steps of:
A. receiving a first signaling to determine a first physical resource pool, wherein the first signaling is semi-static signaling;
B. receiving a second signaling determination physical resource S1 or determining the physical resource itself S1, the second signaling being user equipment specific or the user equipment group specific signaling;
C. transmitting a D2D signal at a transmission power P on the physical resource S1;
D. receiving the third signaling determines at least one of:
-a first power;
-a second power;
wherein, if the physical resource S1 belongs to a first physical resource pool, the transmission power P does not exceed a first power, if the physical resource S1 belongs to a second physical resource pool, the transmission power P does not exceed a second power, the second physical resource pool is a physical resource which does not overlap with the first physical resource pool, the third signaling is semi-static signaling, the third signaling is cell-specific signaling, and is carried by a common radio resource control message; the second power is not greater than the first power.
2. The method of claim 1, further comprising the steps of:
E. and receiving fourth signaling to determine a second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
3. The method of claim 1, wherein the first physical resource pool is one of:
-K available subframes;
-a specific subband S of the K available subframes;
wherein K is a positive integer.
4. The method of claim 1, further comprising the steps of:
F. transmitting a fifth signaling indicating the first physical resource pool.
5. The method of claim 1, wherein the first power is a legal maximum transmit power.
6. A method in a base station, comprising the steps of:
A. sending a first signaling indication first physical resource pool, wherein the first signaling is semi-static signaling;
B. transmitting a second signaling indicating physical resources S1, the second signaling being user equipment-specific or the user equipment group-specific signaling;
D. transmitting a third signaling indication of at least one of:
-a first power;
-a second power;
wherein, if the physical resource S1 belongs to a first physical resource pool, the transmission power P of the D2D user equipment on the physical resource S1 does not exceed a first power, if the physical resource S1 belongs to a second physical resource pool, the transmission power P does not exceed a second power, the second physical resource pool is a physical resource which does not overlap with the first physical resource pool, the third signaling is semi-static signaling, and the third signaling is cell-specific signaling carried by a common radio resource control message; the second power is not greater than the first power.
7. The method of claim 6, further comprising the steps of:
E. and sending a fourth signaling to indicate a second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
8. The method of claim 6, wherein the first physical resource pool is one of:
-K available subframes;
-a specific subband S of the K available subframes;
wherein K is a positive integer.
9. The method of claim 6, wherein the first power is a legal maximum transmit power.
10. A user equipment, characterized in that the equipment comprises:
a first module: receiving a first signaling to determine a first physical resource pool, wherein the first signaling is semi-static signaling;
a second module: receiving a second signaling determination physical resource S1 or determining the physical resource itself S1, the second signaling being user equipment specific or the user equipment group specific signaling;
a third module: transmitting a D2D signal at a transmission power P on the physical resource S1;
a fourth module: receiving the third signaling determines at least one of:
-a first power;
-a second power;
wherein the transmission power P does not exceed a first power if the physical resource S1 belongs to a first physical resource pool, and the transmission power P does not exceed a second power if the physical resource S1 belongs to a second physical resource pool, the second physical resource pool being a physical resource that does not overlap with the first physical resource pool; the third signaling is semi-static signaling, and the third signaling is cell-specific signaling carried by a common radio resource control message; the second power is not greater than the first power.
11. The user equipment of claim 10, further comprising:
a fifth module: and receiving fourth signaling to determine a second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
12. The UE of claim 10, wherein the first physical resource pool is one of:
-K available subframes;
-a specific subband S of the K available subframes;
wherein K is a positive integer.
13. The UE of claim 10, wherein the third module sends a fifth signaling indicating the first physical resource pool.
14. The UE of claim 10, wherein the first power is a legal maximum transmit power.
15. A base station apparatus, characterized in that the apparatus comprises:
a first module: sending a first signaling indication first physical resource pool, wherein the first signaling is semi-static signaling;
a second module: transmitting a second signaling indicating physical resources S1, the second signaling being user equipment-specific or the user equipment group-specific signaling;
a third module: transmitting a third signaling indication of at least one of:
-a first power;
-a second power;
wherein if the physical resource S1 belongs to a first physical resource pool, the transmission power P of the D2D user equipment on the physical resource S1 does not exceed a first power, if the physical resource S1 belongs to a second physical resource pool, the transmission power P does not exceed a second power, the second physical resource pool is a physical resource which does not overlap with the first physical resource pool; the third signaling is semi-static signaling, and the third signaling is cell-specific signaling carried by a common radio resource control message; the second power is not greater than the first power.
16. The base station apparatus according to claim 15, further comprising:
a fourth module: and sending a fourth signaling to indicate a second physical resource pool, wherein the fourth signaling is semi-static signaling or dynamic signaling.
17. The base station device of claim 15, wherein the first physical resource pool is one of:
-K available subframes;
-a specific subband S of the K available subframes;
wherein K is a positive integer.
18. The base station apparatus of claim 15, wherein the first power is a legal maximum transmit power.
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| CN201910183496.3A CN110049541B (en) | 2013-11-01 | 2013-11-01 | Method and device for avoiding D2D interference |
| CN201310534394.4A CN104602350B (en) | 2013-11-01 | 2013-11-01 | A kind of method and apparatus that D2D interference avoids |
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| CN107343297B (en) * | 2016-05-01 | 2019-12-24 | 上海朗帛通信技术有限公司 | Method and device in wireless communication |
| CN107769825B (en) * | 2016-08-16 | 2020-04-24 | 上海朗帛通信技术有限公司 | Method and device in wireless transmission |
| CN107888238B (en) * | 2016-09-30 | 2020-09-01 | 上海朗帛通信技术有限公司 | Method and device for UE (user equipment) and base station for random access |
| CN113890719B (en) | 2017-01-22 | 2024-10-15 | 上海朗帛通信技术有限公司 | Method and device in wireless communication |
| CN114125874A (en) * | 2017-03-26 | 2022-03-01 | 上海朗帛通信技术有限公司 | Method and device used in user equipment and base station for wireless communication |
| CN110915270B (en) * | 2017-08-11 | 2022-05-10 | 华为技术有限公司 | Power control method, terminal and network equipment |
| CN111226478A (en) * | 2018-01-12 | 2020-06-02 | Oppo广东移动通信有限公司 | Data sending method, device and system |
| CN114944901B (en) | 2019-11-15 | 2024-10-18 | 上海朗帛通信技术有限公司 | Method and apparatus in a node for wireless communication |
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| CN110049541A (en) | 2019-07-23 |
| CN104602350B (en) | 2019-04-12 |
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