CN109155921B - Method and apparatus for device-to-device communication - Google Patents

Method and apparatus for device-to-device communication Download PDF

Info

Publication number
CN109155921B
CN109155921B CN201680086073.4A CN201680086073A CN109155921B CN 109155921 B CN109155921 B CN 109155921B CN 201680086073 A CN201680086073 A CN 201680086073A CN 109155921 B CN109155921 B CN 109155921B
Authority
CN
China
Prior art keywords
communication
terminal device
network node
state information
channel state
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201680086073.4A
Other languages
Chinese (zh)
Other versions
CN109155921A (en
Inventor
姜戬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of CN109155921A publication Critical patent/CN109155921A/en
Application granted granted Critical
Publication of CN109155921B publication Critical patent/CN109155921B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Embodiments of the present disclosure provide methods, apparatus, and computer programs for communication. A method implemented at a network node, comprising: obtaining first channel state information for a channel between a network node and a first terminal device in cellular communication with the network node, and second channel state information for a channel aggregated from a device-to-device (D2D) communication device to a receiver of the cellular communication; jointly determining a resource allocation for cellular communication and D2D communication and a transmission power for D2D communication based on the first channel state information and the second channel state information such that performance of cellular communication of the first terminal device is above a predefined performance threshold; and transmitting the determined resource allocation for cellular communication to the first terminal device. By means of this method, the performance of cellular communication can be guaranteed.

Description

Method and apparatus for device-to-device communication
Technical Field
The non-limiting and example embodiments of the present disclosure relate generally to the technical field of wireless communication, and in particular to a method, apparatus and computer program for device-to-device (D2D) communication.
Background
This section introduces aspects that may help to better understand the disclosure. Accordingly, the statements of this section are to be read in this light, and not as admissions of prior art or what is not in the prior art.
As telecommunication operators are striving to meet existing demands from mobile users, new data intensive applications, such as proximity aware services, are emerging. While current fourth generation (also referred to as 4G) cellular technology, such as long term evolution advanced (LTE-a) developed by the third generation partnership project (3GPP), may provide effective Physical (PHY) layer and Medium Access Control (MAC) layer solutions and good performance, it still falls behind the explosive data requirements of mobile users. New architectures have been considered that revolutionize the traditional communication approach of cellular networks, and where D2D communication appears to be a promising solution for the next generation.
In conventional cellular networks, all communications must pass through a Base Station (BS) even if the two parties involved in the communication are close to each other, and this is applicable to conventional low data rate mobile services such as voice calls and text messages, and/or when the users are not close enough to conduct direct communications. In contrast, D2D communication is defined as direct communication between terminal devices, i.e. data can be sent directly from one terminal device to another terminal device without passing through the base station. Mobile users in need of high data rate services such as video sharing, gaming, proximity-aware social networks, etc., may potentially be within a short enough range for direct communication (i.e., D2D communication), and in such cases, D2D communication may be utilized to improve the spectral efficiency, throughput, energy efficiency, latency, or fairness of the wireless network.
The D2D communication may be implemented in the cellular spectrum (i.e., a frequency band dedicated to cellular communication), or it may be implemented in an unlicensed shared spectrum. The former is also known as an in-band D2D deployment and the latter as an out-of-band D2D deployment. D2D communication is generally considered a complementary solution to traditional cellular communication, and thus in both deployments above, there is a possibility that D2D communication and cellular communication coexist.
In wireless communication networks where both D2D communication and cellular communication coexist, effective control of D2D communication may be required to avoid significant negative impact on conventional cellular communication.
Disclosure of Invention
Recently, D2D communication under cellular infrastructure has been proposed as a means for increasing resource utilization, improving user throughput, and extending battery life of user equipment. However, this situation also presents challenges to interference management. To control D2D communications to reduce negative effects (e.g., interference) on non-D2D communications (e.g., conventional cellular communications), methods, apparatuses, and computer programs are provided in the present disclosure. It should be understood that embodiments of the present disclosure are not limited to the example scenario of deploying D2D communication under a cellular infrastructure, but may be widely applied to other scenarios where similar issues exist.
Various embodiments of the present disclosure are generally directed to methods, apparatuses, and computer programs for facilitating coexistence of D2D communications and cellular communications in a wireless communication network without causing significant degradation to the cellular communications. Other features and advantages of embodiments of the present disclosure will also be understood from the following description of the specific embodiments, when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the embodiments of the present disclosure.
In a first aspect of the disclosure, a method implemented at a network node is provided. The method comprises the following steps: obtaining first channel state information for a channel between a network node and a first terminal device in cellular communication with the network node, and second channel state information for a channel from a set of device-to-device D2D communication devices to a receiver in cellular communication between the network node and the first terminal device; jointly determining, based on the first channel state information and the second channel state information, a resource allocation for both cellular communication of the first terminal device and the D2D communication and a first transmission power for the D2D communication such that performance of cellular communication of the first terminal device is above a predefined performance threshold; and transmitting the determined resource allocation for cellular communication to the first terminal device.
In one embodiment, the determining may be performed under at least one of the following conditions: the total transmission power for D2D communications for the set of D2D communications devices is minimized, physical resource blocks are allocated to no more than one terminal device in cellular communication with the network node, and physical resource blocks are allocated to no more than one D2D pair for D2D communications.
In another embodiment, the determining may include: calculating a set of signal-to-interference and noise power ratios, SINR, for cellular communication between the first terminal device and the network node based at least on the first channel state information, the second channel state information and the adjustable transmission power for D2D communication; and selecting a minimum SINR above a predefined performance threshold from the calculated set of SINRs; and determining the first transmission power for D2D communication as the transmission power corresponding to the selected minimum SINR.
In yet another embodiment, the determining may include: determining resource allocation and first transmission power by solving an optimization problem:
Figure BDA0001877870110000031
Figure BDA0001877870110000032
xj＝0，1
Figure BDA0001877870110000033
wherein
Figure BDA0001877870110000034
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; if the jth D2D transmitter is allocated the same resource block as the first terminal device, x j1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices;
Figure BDA0001877870110000035
representing a channel gain from a jth D2D transmitter of the set of D2D communication devices to the first terminal device and indicated by the second channel state information; pBRepresenting a transmission power of the network node; h isBCRepresenting the channel gain from the network node to the first terminal device and indicated by the first channel state information, γminRepresents a predefined performance threshold for the first terminal device and in one embodiment it may be a predefined SINR value and N represents the received noise power at the first terminal device.
In one embodiment, the determining may include: determining the resource allocation and the first transmission power by solving an optimization problem:
Figure BDA0001877870110000041
Figure BDA0001877870110000042
xj＝0，1
Figure BDA0001877870110000043
wherein
Figure BDA0001877870110000044
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; if the jth D2D transmitter is allocated the same resource block as the first terminal device, x j1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices,
Figure BDA0001877870110000045
represents the channel gain from the jth D2D transmitter to the network node and is indicated by the second channel state information; pCRepresents the transmission power of the first terminal device, hCBRepresenting the channel gain from the first terminal device to the network node and which is indicated by the first channel state information, γminRepresents a predefined threshold value for the first terminal device and in one embodiment it may be a predefined SINR value and N represents the received noise power at the network node.
In another embodiment, the determined first transmission power is a maximum transmission power allowed for the D2D communication.
In some embodiments, the method further may comprise: the determined resource allocation and the first transmission power for the D2D communication are transmitted to the set of D2D communication devices.
In one embodiment, the method may further comprise: obtaining third channel state information for a channel from a transmitter of cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information for a channel of D2D communication for the D2D communication device; determining a signal to interference and noise power ratio, SINR, for D2D communications of the D2D communication device based on the determined first transmission power, the third channel state information, and the fourth channel state information; and transmitting the determined SINR to the D2D communication device.
In a second aspect of the disclosure, a method implemented in a terminal device is provided. The method comprises receiving from a network node a configuration for D2D communication indicating a transmission power or signal to noise and interference power ratio, SINR, and a resource allocation for D2D communication; selecting a modulation and coding scheme for D2D communication based on the received configuration; and implementing D2D communication according to the resource allocation and the selected modulation and coding scheme.
In one embodiment, the selecting a modulation and coding scheme for D2D communication based on the received configuration comprises at least one of: selecting a highest modulation and coding scheme from a predefined set of modulation and coding schemes that can be supported by the configuration; and selecting a coding scheme not included in the predefined set of modulation and coding schemes if the indicated transmission power or SINR is below a threshold.
In another embodiment, the method may further comprise: a first signal and a second signal are transmitted to the network node, the first signal indicating channel state information for a channel from a transmitter of the cellular communication to the terminal device, and the second signal indicating channel state information for a channel of the D2D communication for the terminal device.
In a third aspect of the disclosure, a network node is provided. The network node comprises: a first acquisition unit configured to acquire first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a device-to-device D2D communication device set to a receiver in cellular communication between the network node and the first terminal device; a determining unit configured to jointly determine, based on the first channel state information and the second channel state information, resource allocations for both cellular communication and D2D communication of the first terminal device and a first transmission power for D2D communication such that performance of cellular communication of the first terminal device is above a predefined performance threshold; and a first transmitting unit configured to transmit the determined resource allocation for cellular communication to the first terminal device.
In a fourth aspect of the present disclosure, a terminal device is provided. The terminal device includes: a receiving unit configured to receive a configuration for D2D communication and a resource allocation for D2D communication from a network node, the configuration indicating a transmission power or a signal to noise and interference power ratio, SINR; an MCS selection unit configured to select a modulation and coding scheme for D2D communication based on the received configuration; and a D2D communication unit configured to implement D2D communication according to the resource allocation and the selected modulation and coding scheme.
In a fifth aspect of the present disclosure, a network node is provided. The network node comprises at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to perform a method according to the first aspect of the disclosure.
In a sixth aspect of the present disclosure, a terminal device is provided. The terminal device includes at least one processor and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to perform a method according to a second aspect of the disclosure.
In a seventh aspect of the present disclosure, there is provided an apparatus comprising means for performing the method according to the first aspect of the present disclosure.
In an eighth aspect of the present disclosure, there is provided an apparatus comprising means for performing a method according to the second aspect of the present disclosure.
In a ninth aspect of the present disclosure, there is provided a computer program product comprising at least one computer readable non-transitory memory medium having program code stored thereon, which when executed by an apparatus, causes the apparatus to perform a method according to the first aspect of the present disclosure.
In a tenth aspect of the present invention, there is provided a computer program product comprising at least one computer readable non-transitory memory medium having program code stored thereon, which when executed by an apparatus, causes the apparatus to perform a method according to the second aspect of the present disclosure.
According to various aspects and embodiments as mentioned above, the negative impact of D2D communication to cellular communication may be reduced.
Drawings
The above and other aspects, features and benefits of various embodiments of the present disclosure will become more apparent from the following detailed description, by way of example, with reference to the accompanying drawings, wherein like reference numerals or letters are used to designate like or equivalent elements. The accompanying drawings, which are not necessarily to scale, are shown to facilitate a better understanding of embodiments of the disclosure and are, therefore, not to be considered limiting of its scope, in which:
fig. 1 illustrates an example wireless communication network 100 in which embodiments of the present disclosure may be implemented;
2 a-2 b schematically illustrate interference to/from D2D communications in a cellular uplink scenario and a cellular downlink scenario, respectively;
3 a-3 c illustrate a flow diagram of a method implemented at a network node according to an embodiment of the present disclosure;
fig. 4 shows an example of a signaling flow according to an embodiment of the disclosure;
5 a-5 b show a flow diagram of a method implemented at a terminal device according to an embodiment of the present disclosure;
fig. 6 shows an example of a mapping relationship between a signal to interference and noise power ratio (SINR) and a Modulation and Coding Scheme (MCS);
fig. 7 shows a schematic block diagram of an apparatus implemented as/in a network node according to an embodiment of the present disclosure;
fig. 8 shows a schematic block diagram of an apparatus implemented as/in a terminal device according to an embodiment of the present disclosure; and
fig. 9 shows a simplified block diagram of an apparatus that may be embodied as/in a network node and an apparatus 1120 that may be embodied as/in a terminal device.
Detailed Description
Hereinafter, the principle and spirit of the present disclosure will be described with reference to illustrative embodiments. It is to be understood that all of these examples are given solely for the purpose of better understanding and further practicing the invention by those skilled in the art, and are not intended to limit the scope of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. In the interest of clarity, not all features of an actual implementation are described in this specification.
References in the specification to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed terms.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "has," "having," "contains" and/or "containing," when used herein, specify the presence of stated features, elements, and/or components, etc., but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.
In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
As used herein, the term "wireless communication network" refers to a network that conforms to any suitable wireless communication standard, such as Long Term Evolution (LTE), LTE-advanced (LTE-a), Wideband Code Division Multiple Access (WCDMA), High Speed Packet Access (HSPA), and the like. Further, communication between the network nodes and the terminal devices in the wireless communication network may be performed according to any suitable generation communication protocols, including but not limited to first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, future fifth generation (5G) communication protocols, and/or any other protocols currently known or developed in the future.
As used herein, the term "network node" refers to a node in a wireless communication network via which a terminal device accesses the network and/or receives control or services therefrom. A network node may refer to a Base Station (BS) or an Access Point (AP), e.g., a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, a low power node such as a femto, pico, etc.
The term "terminal device" refers to any terminal device that can access a wireless communication network and receive services therefrom. By way of example, and not limitation, the terminal device may be a User Equipment (UE), which may be a Subscriber Station (SS), a portable subscriber station, a Mobile Station (MS), or an Access Terminal (AT). The terminal devices may include, but are not limited to, mobile phones, cellular phones, smart phones, tablets, wearable devices, Personal Digital Assistants (PDAs), portable computers, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback devices, wearable terminal devices, in-vehicle wireless terminal devices, and the like.
In the following description, the terms "terminal device", "terminal", "user equipment" and "UE" may be used interchangeably.
Fig. 1 illustrates an example wireless communication network 100 in which embodiments of the present disclosure may be implemented. As shown in fig. 1, wireless communication network 100 may include one or more network nodes, such as network node 101, which may be in the form of an eNB. It should be appreciated that network node 101 may also be in the form of node B, BTS (base transceiver station) and/or a BSS (base station subsystem), an Access Point (AP), etc. The network node 101 provides wireless connectivity to a plurality of terminal devices, e.g. cellular UEs (also denoted CUE in fig. 1 and hereafter) 102 and 105 within its coverage area. The wireless communication network 100 may further include one or more terminal devices capable of D2D communication, such as D2D communication devices (D2D devices which are also denoted DUE in fig. 1 and are hereinafter referred to as DUE) 106 and 109. The D2D communication enables direct communication between a D2D pair including a D2D transmitter (Tx) and a corresponding D2D receiver (Rx). The D2D communication between the DUE in fig. 1 may be used to improve the resource utilization efficiency of the wireless communication network 100 and improve the user experience by improving user throughput and extending the battery life of the user equipment.
As an example, the wireless communication network 100 may be a 4G LTE network. In this example, Downlink (DL) transmissions from eNB 101(Tx) to the CUE (Rx), e.g., (CUEs 102 and 103), are multiplexed via an Orthogonal Frequency Division Multiple Access (OFDMA) framework, and Uplink (UL) transmissions from the CUE (Tx), e.g., CUE 104, to eNB 101(Rx) use single carrier frequency division multiple access (SC-FDMA) techniques.
In an LTE network, the system bandwidth may be divided into a plurality of Resource Blocks (RBs), and each downlink/uplink transmission or D2D communication may be allocated one or more RBs. If the D2D users occupy resources not occupied by the CUE, they will not cause interference to the CUE and will not experience interference from the CUE. On the other hand, if D2D users use the same resources as the CUE, they may cause/experience interference to/from the CUE. An exemplary interference signal 111 and 114 is shown in fig. 1.
In fig. 2 a-2 b, potential interference to/from a D2D communication device is shown for a wireless system 200 for a DL transmission scenario and a UL transmission scenario, respectively. As shown in fig. 2a, during the DL period, two types of interference will be seen, one of which is interference from the D2D transmitter (e.g., DUE203 or 206 in fig. 2a) to the cellular UE (e.g., CUE 202) that is receiving from the network node (e.g., eNB 201), the other of which is interference from the network node to the D2D receiver (e.g., DUE 204 or 205). Since the maximum transmission power of the eNB is greater than the maximum transmission power of the D2D transmitter, in some embodiments, interference from the D2D transmitter to the CUE may only result in a negligible performance loss, but if the D2D transmitter is very close to the CUE, the interference may not be negligible. As shown in fig. 2b, the coexistence of the D2D pair and the CUE in the same RB also causes two types of interference during the UL period. One is interference from the D2D transmitter (e.g., DUE203 or 206 in fig. 2a) to the eNB that is receiving from the CUE (e.g., CUE 202), and the other is interference from the CUE to the DUE (e.g., DUE 204 or 205). All of these interferences may degrade the overall system performance. Thus, interference management plays a key role in gaining potential benefits from D2D communications, and overall system capacity and efficiency may even degrade if interference is not well controlled.
To reduce interference, various schemes may be used, including power control, adaptive scheduling, and cross-layer optimization. In conventional solutions that manage power control and resource allocation separately, it may be difficult to make optimization decisions at the eNB side. Furthermore, most conventional solutions fail to consider the performance of both the CUE and DUE.
To address at least some of the above issues, methods, apparatuses, and computer programs have been presented herein. With some embodiments of the present disclosure, the performance of normal cellular UE communication may be guaranteed by jointly controlling the resource allocation and transmission power of the DUE. With some other embodiments, the power of the D2D device may be minimized under conditions that ensure normal cellular communication.
It should be understood that embodiments of the present disclosure are not limited to the example wireless communication networks 100 or 200 shown in fig. 1 or fig. 2a and 2b, but may be used more broadly in any application scenario where similar issues exist.
Referring now to fig. 3 a-3 c, a flow chart of a method 300 in a wireless communication network (e.g., the wireless communication network 100 shown in fig. 1) is shown. In one embodiment, method 300 may be implemented by a network node (e.g., network node 101 shown in fig. 1 or network node 201 shown in fig. 2 a-2 b).
As illustrated in fig. 3a, the method 300 includes obtaining, at block 310, first channel state information for a channel between a network node (e.g., eNB 101 in fig. 1) and a first terminal device (e.g., CUE 105 shown in fig. 1) in cellular communication with the network node, and second channel state information for a channel from a set of D2D communication devices (e.g., DUE 106 and 109 shown in fig. 1) to a receiver of cellular communication between the network node and the first terminal device. It is to be understood that the receiver of the cellular communication is the first terminal device for downlink communication and the eNB for uplink communication. At block 320, the network node jointly determines, based on the first channel state information and the second channel state information, a resource allocation for both cellular communication and D2D communication of the first terminal device and a first transmission power for D2D communication such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold. At block 330, the network node sends the determined resource allocation for cellular communication to the first terminal device.
With the method 300, normal cellular communication for a first terminal device (e.g., the CUE 105 shown in fig. 1) may be guaranteed by jointly determining resource allocations for both the first terminal device and the D2D communication and a transmission power for the D2D communication.
It will be appreciated that the first terminal device may be any cellular communication device in a wireless communication network and the method 300 may be applied to determine resource allocations for more than one cellular UE. Assuming that a base station serves N cellular UEs and M UEs in a cell, the set of cellular UEs may be denoted as C ═ {1, 2.., N }, and the set of D2D communication devices may be denoted as D ═ 1, 2.., M }. In one embodiment, the first terminal device described with reference to fig. 3a and method 300 may be any CUE in set C (e.g., the ith terminal device in set C), and method 300 may be performed to determine resource allocations for all or some UEs in set C. In another embodiment, the set of D2D communication devices described with reference to method 300 may be set D or a subset thereof. In some cases, the number of DUE may be greater than the number of CUE, e.g., M > > N.
In one embodiment, at block 310, the network node may obtain the first channel state information and the second channel state information by receiving a channel state information report from the first terminal device. For example, in the downlink period, the first terminal device may measure pilot signals (or Reference Signals (RSs)) from the network nodes and D2D transmitters in the set of D2D communication devices, evaluate and report channel state information for the corresponding channels to the network nodes via the uplink.
In another embodiment, at block 310, the network node may obtain the first and second channel state information by measuring, at the network node side, pilot signals (or Reference Signals (RSs)) from the first terminal device and a D2D transmitter of the set of D2D communication devices during the uplink period. It will be appreciated that in some embodiments the network node may obtain the first channel state information by measuring data transmissions from the first terminal device and/or obtain the second channel state information by measuring preambles or discovery signals from D2D communication devices of the set of D2D communication devices. Embodiments are not limited to any particular manner in which the network node obtains the first channel state information and the second channel state information.
Although in some embodiments described below, the first channel state information and the second channel state information take the example form of a channel response that may be denoted as H, it will be appreciated that embodiments are not limited thereto. For example, in some embodiments, the first channel state information and/or the second channel state information may be any indication capable of indicating a channel state of the corresponding channel. For example, the channel state information may be, but is not limited to, path loss, channel response, or distance. In some other embodiments, the first channel state information and/or the second channel state information may be an indication of an interference level experienced in the corresponding channel.
In one embodiment, at block 320, the network node may determine the resource allocation and the first transmission power on at least one of the following conditions:
-the total transmission power for D2D communication of the set of D2D communication devices is minimized,
-physical resource blocks are allocated to no more than one terminal device in cellular communication with the network node, and
-physical resource blocks are allocated to no more than one D2D pair for D2D communication.
The first condition is advantageous to keep the power consumption of the D2D device at a minimum level, while the other two conditions may facilitate simplified computations and thereby reduce computational complexity on the network side.
As shown in fig. 3b, in one embodiment, at block 320, the network node may determine the transmission power for the D2D communication through the following subframes 3201 and 3203.
At subframe 3201, the network node may be based at least on the first channel state information, the second channel state information, and the adjustable transmission power P for D2D communicationDTo calculate a set of signal to interference and noise power ratios (SINRs) for cellular communication between the first terminal device and the network node. For example, assuming that the first terminal device is the ith terminal device in the CUE set, the DL SINR for the ith CUE (i.e., the first terminal device) may be calculated using the following equation (1):
Figure BDA0001877870110000131
wherein P isBRepresents the transmit power of the eNB;
Figure BDA0001877870110000132
representing the transmit power of the jth D2D transmitter in the set of D2D devices;
Figure BDA0001877870110000133
is the channel gain (or channel response) between the eNB and the ith CUE (i.e., the first terminal device), and it may be indicated by the first channel state information obtained by the network node (e.g., eNB 101 in fig. 1) at block 310;
Figure BDA0001877870110000134
represents the channel gain from the jth D2D transmitter to the ith CUE; n represents the received noise power at the CUE, which may be assumed to be Additive White Gaussian Noise (AWGN) in some embodiments; and xi,jIndicates whether the jth D2D transmitter and the ith CUE share the same resource block(s), and if the same RB(s) are allocated to them, x i,j1, otherwise xi,j0. For the
Figure BDA0001877870110000135
The network node may obtain a value for SINR
Figure BDA0001877870110000136
In one embodiment, the network node may be directed to
Figure BDA0001877870110000137
Each candidate value of (a) and xi,jCalculates the SINR value for each candidate value of
Figure BDA0001877870110000138
In another embodimentIn (3), the network node may first determine xi,jIs then based on
Figure BDA0001877870110000139
And determined xi,jTo calculate the SINR value
Figure BDA00018778701100001310
At subframe 3202, the network node may derive the calculated SINR
Figure BDA00018778701100001311
The minimum SINR above a predefined performance threshold is selected from the set. For example only, in one embodiment, the predefined performance threshold may be an SINR threshold that may guarantee performance requirements of the ith UE (i.e., the first terminal device). In another embodiment, the predefined performance threshold may be an SINR threshold that may guarantee minimum cellular communication for the first terminal device.
Alternatively, in some embodiments, the predefined performance threshold may be a threshold on Bit Error Rate (BER), block error rate (BLER), throughput, or data rate.
At subframe 3203, the network node may determine a first transmission power for the D2D communication as the transmission power corresponding to the selected minimum SINR.
As another example, in one embodiment, at block 320, the network node may determine the resource allocation and the first transmission power under the conditions (constraints) shown in equation (2):
Figure BDA0001877870110000141
wherein the content of the first and second substances,
Figure BDA0001877870110000142
represents a predefined performance threshold for the first terminal device, which in one embodiment may be a predefined SINR value.
In one embodiment, at block 320, the network node may perform the determination by solving an optimization problem as shown in equation (2a) below:
Figure BDA0001877870110000143
can be based on the information shown in equation (2) and equation (1) above for
Figure BDA0001877870110000144
To obtain equation (2 a). In the case of the equation (2a),
Figure BDA0001877870110000145
representing a transmit power of a jth D2D communication device in the set of D2D communication devices; in one embodiment, since we only consider the ith CUE as the first terminal device, then for simplicity, index i may be omitted; in this case, if the jth D2D communication device is allocated the same resource block as the first terminal device, xj1, otherwise xj0; n is the number of terminal devices in the D2D set of communication devices;
Figure BDA0001877870110000151
represents a channel gain from a jth D2D transmitter in the set of D2D communication devices to the first terminal device and is indicated by the second channel state information; pBRepresenting a transmission power of the network node; h isBCRepresenting the channel gain from the network node to the first terminal device and indicated by the first channel state information, γminRepresenting a predefined performance threshold (e.g., SINR threshold) for the first terminal device, and N represents the received noise power at the first terminal device.
In this embodiment, the determination performed by the network node at block 320 ensures reasonable DL communication performance of the first terminal device.
To solve this problem of low complexity as described above, the equation can be generalized as a change problem, which is one of the variations of the knapsack problem. Example (b)For example, the network node may preset a minimum transmit power (denoted as D2D) for each D2D transmitter
Figure BDA0001877870110000152
) Then let it
Figure BDA0001877870110000153
And C ═ PBhBC)/γminN, then the following equation (2b) for optimization can be obtained:
Figure BDA0001877870110000154
the change problem is directed to change with a fixed amount and minimizes the number of changes. The unit of each change is wjExpressed, and the total amount is C. The change problem can be easily solved by various methods known to those skilled in the art, such as dynamic programming algorithms, greedy methods, corresponding specific principles and implementations can be found in corresponding references, and embodiments of the present disclosure are not limited to any particular method for solving the formulated equation (2b), and thus details will be omitted herein.
After solving the equation, if xjEqual to 1, the DUE will transmit data at this RB with a preset minimum power, if xjEqual to 0, the DUE will not send data at this RB, thus by minimizing xjSum of (d), total transmission power of DUE
Figure BDA0001877870110000161
Will be minimized.
Alternatively or additionally, in another embodiment, optimization may be performed on the UL communication of the first terminal device. For the uplink, the SINR at the network node may be calculated using equation (3), for example:
Figure BDA0001877870110000162
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0001877870110000163
representing the transmit power of the jth D2D transmitter in the set of D2D communication devices; if the jth D2D communication device is allocated the same resource block as the first terminal device (the ith CUE in this example), x i,j1, otherwise xi,j0; n is the number of end devices in the D2D set of communication devices,
Figure BDA0001877870110000164
represents a channel gain from the jth D2D transmitter to the network node and is indicated by the second channel state information;
Figure BDA0001877870110000165
represents the transmission power of the first terminal device,
Figure BDA0001877870110000166
representing the channel gain from the first terminal device to the network node and indicated by the first channel state information, and N representing the received noise power at the network node.
As an example, similar to that described above with reference to DL communication, the network node may make the determination at block 320 under the following conditions shown in equation (4) in order to guarantee acceptable performance of the UL for the first terminal device:
Figure BDA0001877870110000167
in one embodiment, at block 320, the network node may perform the determination by solving an optimization problem as shown in equation (4a) below:
Figure BDA0001877870110000171
wherein if the jth D2D communication device is assigned with the jth D2D communication deviceA terminal device having the same resource block, xj1, otherwise xj＝0；PCDenotes the transmission power of the first terminal device, hCBRepresenting the channel gain from the first terminal device to the network node and which is indicated by the first channel state information, and γminRepresenting a predefined threshold for the first terminal device.
Similar to the implementation of the DL scenario, at block 320, the network node may determine the resource allocation and the first transmission power by solving a simplified problem, namely the change over problem shown in equation (4 b):
Figure BDA0001877870110000172
equation (4b) has the same form as equation (2b), except that
Figure BDA0001877870110000173
And
Figure BDA0001877870110000174
in one embodiment, the first transmission power determined at block 320 is the maximum transmission power allowed for D2D communications. That is, the D2D device can only transmit at a power equal to or lower than the first transmission power.
As shown in fig. 3c, in another embodiment, the method 300 may further comprise block 340 in which the network node sends the determined resource allocation and the first transmission power for D2D communication to the set of D2D communication devices. Block 340 is not always required. If the set of D2D communication devices does not currently have D2D traffic, the network may not send them the resource allocation and the first transmission power. In another embodiment, the network node may instead indicate the determined modulation and coding scheme to the DUE.
Alternatively or additionally, in one embodiment, the method 300 may include block 350-370. At block 350, the network node obtains third channel state information for a channel from a transmitter of cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information for a channel of D2D communication for the D2D communication device. In one embodiment, the network node may obtain the third channel state information and/or the fourth channel state information from a DUE (e.g., DUE 109 shown in fig. 1). For example, the DUE may measure cellular transmissions (e.g., pilot, RS) from the network node (DL) or the first terminal device (UL) and report the estimated channel gain as third channel state information to the network node. In another embodiment, the network node may obtain the third channel state information by measuring a signal from the DUE. The DUE may also measure the D2D link and report it to the network node as fourth channel state information.
At block 360, the network node may determine an SINR for the D2D communication of the DUE based on the first transmission power determined at block 320, the third channel state information and the fourth channel state information obtained at block 350. In one embodiment, the SINR for DUE may be calculated as in equation (5):
Figure BDA0001877870110000181
wherein P isBWhich represents the transmit power of the network node,
Figure BDA0001877870110000182
represents the transmit power of the jth D2D transmitter (i.e., the DUE for which the SINR was calculated),
Figure BDA0001877870110000183
is the channel power gain between eNB and DUE,
Figure BDA0001877870110000184
represents the channel gain for D2D communication, N represents the received noise power on the DUE side; and xjIndicating whether D2D link j reuses cellular DL resources, if DUE j and cellular communication both use the same RB, then xj1, otherwise xj0. In equation (5)) The transmission from the eNB is considered to be interference to the DUE.
Alternatively, in another embodiment, the SINR for the DUE may be calculated using equation (6) by considering the interference of the uplink transmission from one or more cellular UEs:
Figure BDA0001877870110000185
wherein the content of the first and second substances,
Figure BDA0001877870110000191
represents the transmit power of the i CUE,
Figure BDA0001877870110000192
is the channel power gain between the ith cellular UE and the DUE,
Figure BDA0001877870110000193
represents the channel gain for D2D communication, N represents the received noise power on the DUE side; and xi,jIndicating whether D2D link j reuses UL resources of the ith CUE, if the same RB is used, xj1, otherwise xj0. In equation (6), UL transmissions from one or more CUEs are considered to be interference to the DUE.
At block 370, the network node may send the SINR determined at block 360 to the D2D communication device.
Reference is now made to fig. 4, which illustrates an example of a signaling flow in accordance with an embodiment of the present disclosure. As shown in fig. 4, in the downlink, e.g., in the pilot time slot of a special subframe, the eNB transmits pilot signals that can be measured by both the CUE and D2D devices (as shown by 401 and 403). The UEs may estimate the path loss or channel response between themselves and the eNB based on the downlink pilot signals received from the eNB (as shown at 404 and 405). For example, the UE may measure the received signal strength of the pilot signal. In one embodiment, the UE may send pilot signals back to the eNB using uplink pilot slots at 406 and 407. At 408, the eNB may measure channel gain between itself and the UE based on the received pilot signal (e.g., strength of the pilot signal). The D2D receivers (Rx) may also measure the channel gain between themselves and the CUE and the gain between themselves and the D2D transmitter (Tx) at 409 by listening for the uplink pilot signals transmitted by the CUE and D2D Tx, respectively. At 410, the D2D device (e.g., D2D receiver) may report the channel gain for the D2D communication to the eNB. After obtaining the channel gain for the channel of interest, at 411, the eNB may determine resource allocations CUE and DUE and transmission power for the D2D device, e.g., as described with reference to method 300. In one embodiment, the eNB may send the calculated resource allocation information to the CUE at 412. In another embodiment, the eNB may also send the calculated SINR and resource allocation to the DUE (e.g., D2D receiver or D2D transmitter or both) at 413. Based on the indicated resource allocation and transmission power, data transmission/reception may be performed by the CUE and DUE at 414. For example, the CUE may start the UL transmission procedure on a particular time slot and allocated RB, while the DUE may transmit to its peer in the D2D pair with the particular power indicated.
Referring now to fig. 5 a-5 b, shown are flow charts of a method 500 implemented at a D2D end device (also referred to hereinafter as a DUE, e.g., DUE 108 or 109 of fig. 1). As shown in fig. 5a, the method 500 includes block 510, where the DUE receives, from the network node, a configuration for D2D communication and a resource allocation for D2D communication, the configuration indicating a transmission power or SINR. In one embodiment, the indicated transmission power is a maximum transmission power allowed for the DUE, and/or the SINR is a maximum SINR for the DUE. At block 520, the DUE selects a Modulation and Coding Scheme (MCS) for the D2D communication based on the received configuration; and at block 530, the DUE implements D2D communication according to the resource allocation and the selected MCS.
In one embodiment, as shown in fig. 5b, at block 520, the DUE may select the highest modulation and coding scheme that can be supported by the configuration from a predefined set of modulation and coding schemes at block 5201 and/or select a coding scheme not included in the predefined set of modulation and coding schemes if the transmission power or SINR indicated at 5202 is below a threshold. This enables automatic Adaptive Modulation and Coding (AMC) on the DUE side based on the indicated transmission power or SINR. AMC is one of the most important techniques for improving system capacity, and it is a channel-aware technique that adapts modulation. In conventional cellular systems, the eNB may adjust the Modulation and Coding Scheme (MCS) according to the channel conditions, which may be reported back by the user, e.g., via Channel Quality Indicator (CQI) reports. With the embodiments of the present disclosure, AMC may be performed on the DUE side based on the transmission power and/or SINR indicated by the eNB.
For example, the DUE may use the received SINR as a target SINR for its D2D communication to select a modulation scheme and a coding rate. An example of a predefined MCS set is shown in fig. 6, and each MCS corresponds to a particular SINR value. The transmitter of the D2D pair may select a coding rate and modulation scheme for the allocated RBs, e.g., it may select the maximum MCS and coding that may be supported by the indicated target SINR, with the aim of ensuring proper communication for the CUE and D2D pairs.
In one embodiment, the DUE may use a predefined special coding scheme for its D2D communication if the indicated SINR is below a threshold, e.g., the SINR corresponds to the lowest MCS in a predefined MCS set. The predefined special coding scheme may be a coding scheme that is not included in the predefined set of modulation and coding schemes. For example, if the SINR received from the eNB is below-5.1 dB (corresponding to the lowest MCS for QPSK +1/8 coding rate), the MCS in the predefined MCS set cannot be used, and in this case, the DUE may fall back to the predefined coding scheme at block 5202. The predefined special coding scheme provides a data rate that is lower than the data rate supported by the lowest MCS of the predefined MCS set. Although embodiments of the present disclosure are not limited to any particular predefined coding scheme, as one example, it may be a repetition coding scheme. Repetition coding schemes repeat the source bits prior to coding, and repetition can further increase redundancy to compensate for fading of the wireless channel. For this purpose, the DUE may predefine a specific repetition rule. In one embodiment, the D2D transmitter may determine to use a repetition coding scheme and signal the corresponding D2D receiver with signaling before the D2D data communication begins.
Optionally, in one embodiment, the method 500 further may include block 540, wherein the DUE transmits a first signal and a second signal to the network node, the first signal indicating channel state information of a channel from a transmitter of the cellular communication (eNB for DL or CUE for UL) to the terminal device, and the second signal indicating channel state information of a channel for D2D communication of the terminal device. In one embodiment, the first and second signals may provide third and fourth channel state information to the eNB for use by the eNB at block 360 of method 300.
Referring now to fig. 7, a schematic block diagram of an apparatus 700 in a wireless communication network (e.g., the wireless communication network 100 shown in fig. 1) is shown. The apparatus may be implemented as/in a network node, e.g., an eNB 101 shown in fig. 1. The apparatus 700 is operable to perform the example method 300 described with reference to fig. 3 a-3 c, and possibly any other processes or methods. It should also be understood that the method 300 need not be performed by the apparatus 700. At least some of the steps of method 300 may be performed by one or more other entities.
As illustrated in fig. 7, the apparatus 700 comprises a first obtaining unit 701 configured to obtain first channel state information of a channel between a network node (e.g., eNB 101 of fig. 1) and a first terminal device (e.g., CUE 105 of fig. 1) in cellular communication with the network node, and second channel state information of a channel from a device-to-device D2D communication device set (e.g., DUE 106 and 109 of fig. 1) to a receiver of cellular communication between the network node and the first terminal device; a determining unit 702 configured to jointly determine, based on the first channel state information and the second channel state information, a resource allocation for both cellular communication and D2D communication of the first terminal device and a first transmission power for D2D communication such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold; and a first transmitting unit 703 configured to transmit the determined resource allocation for cellular communication to the first terminal device.
In one embodiment, units 701, 702, and 703 may be configured to perform the operations of blocks 310, 320, and 330, respectively, of method 300, and thus the description provided with reference to method 300 and fig. 3 a-3 c with respect to blocks 310 and 330 also applies here, and details will not be repeated. Likewise, the description regarding the first channel state information, the second channel state information, and the predefined performance threshold provided with reference to method 300 may also be applied herein in some embodiments, and thus details will not be repeated.
Similar to that described with reference to block 320 of method 300, determination unit 702 may be configured to perform the determination under at least one of the following conditions: the total transmission power for D2D communications for the set of D2D communications devices is minimized, physical resource blocks are allocated to no more than one terminal device in cellular communication with the network node, and physical resource blocks are allocated to no more than one D2D pair for D2D communications. One example of the applied condition can be found in equation (2) or (4).
In another embodiment, the determining unit 702 may comprise a calculating unit 7021 configured to calculate a set of signal to interference and noise power ratios, SINR, for cellular communication between the first terminal device and the network node based on at least the first channel state information, the second channel state information and the adjustable transmission power for D2D communication; an SINR selecting unit 7022 configured to select a minimum SINR above a predefined performance threshold from the calculated set of SINRs; and a power determining unit 7023 configured to determine the first transmission power for the D2D communication as the transmission power corresponding to the selected minimum SINR.
Alternatively, in another embodiment, the determining unit 702 may be configured to determine the resource allocation and the first transmission power by solving an optimization problem shown in equation (2a), (2b), (4a) or (4 b).
In one embodiment, the first transmission power determined by the determining unit 702 is a maximum transmission power allowed for D2D communication.
Optionally, in another embodiment, the apparatus 700 further may comprise: a second transmitting unit 704 configured to transmit the determined resource allocation and the first transmission power for the D2D communication to the set of D2D communication devices.
Alternatively or additionally, in a further embodiment, the apparatus 700 may comprise a second obtaining unit 705 configured to obtain third channel state information of a channel from a transmitter of cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information of a channel for D2D communication of the D2D communication device; an SINR determination unit 706 configured to determine a signal to interference and noise power ratio, SINR, for D2D communication of the D2D communication device based on the determined first transmission power, third channel state information and fourth channel state information; and a third transmitting unit 707 configured to transmit the determined SINR to the D2D communication device.
Fig. 8 shows a schematic block diagram of an apparatus 800. The apparatus 800 may be implemented as/in a terminal device, such as the D2D terminal device 108 or 109 shown in fig. 1. The apparatus 800 may be operable to perform the example method 500 described with reference to fig. 5 a-5 b, and possibly any other processes or methods. It should be understood that the method 500 need not be performed by the apparatus 800. At least some of the steps of method 500 may be performed by one or more other entities.
In particular, as illustrated in fig. 8, the apparatus 800 comprises a receiving unit 801 configured to receive, from a network node (e.g., eNB 101 shown in fig. 1), a configuration for D2D communication indicating a transmission power or a signal to noise and interference power ratio, SINR, and a resource allocation for D2D communication; an MCS selection unit 802 configured to select a modulation and coding scheme for D2D communication based on the received configuration; and a D2D communication unit 803 configured to implement D2D communication according to the resource allocation and the selected modulation and coding scheme.
In some embodiments, the apparatus 800 may be operable to perform the example method 500 described with reference to fig. 5 a-5 b, and thus the associated description provided with reference to the method 500 is also applicable herein.
In one embodiment, the MCS selection unit 802 may be configured to select the MCS by at least one of: selecting a highest modulation and coding scheme from a predefined set of modulation and coding schemes that can be supported by the configuration; and selecting a coding scheme not included in the predefined set of modulation and coding schemes if the indicated transmission power or SINR is below a threshold.
As shown in fig. 8, in some embodiments, the apparatus 800 further may include a feedback unit 804 configured to transmit, to the network node, a first signal and a second signal, the first signal indicating channel state information of a channel from a transmitter of the cellular communication (e.g., the CUE 105 or the eNB 101 shown in fig. 1) to the terminal device, and the second signal indicating channel state information of a channel for D2D communication of the terminal device.
Fig. 9 shows a simplified block diagram of an apparatus 910 that may be embodied in/as a network node (e.g., eNB 101 shown in fig. 1) and an apparatus 920 that may be embodied in/as a terminal device (e.g., one of D2D terminal devices 106 and 109 shown in fig. 1).
The apparatus 910 may include at least one processor 911, such as a Data Processor (DP), and at least one memory (MEM)912 coupled to the processor 911. The apparatus 910 further may include a transmitter TX and a receiver RX 913 coupled to the processor 911. The MEM 912 may be a non-transitory machine-readable memory medium, and it may store a Program (PROG) 914. The PROG 914 may include instructions that, when executed on the associated processor 911, enable the apparatus 910 to operate in accordance with embodiments of the disclosure, e.g., to perform the method 300. The combination of the at least one processor 911 and the at least one MEM 912 may form a processing apparatus 915 suitable for implementing various embodiments of the present disclosure (e.g., the method 300).
The apparatus 920 includes at least one processor 921, such as a DP, and at least one MEM 922 coupled to the processor 921. The apparatus 920 further may include a suitable TX/RX 923 coupled to the processor 921. The MEM 922 may be a non-transitory machine-readable memory medium and it may store the PROG 924. The PROG 924 may include instructions that, when executed on the associated processor 921, enable the apparatus 920 to operate according to embodiments of the present disclosure, e.g., to perform the method 500. The combination of the at least one processor 921 and the at least one MEM 922 may form a processing device 925 suitable for implementing various embodiments of the present disclosure (e.g., method 500).
Various embodiments of the disclosure may be implemented by a computer program, software, firmware, hardware, or a combination thereof, which is executable by one or more of the processors 911 and 921.
By way of non-limiting example, the MEMs 912 and 922 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory terminal devices, magnetic memory terminal devices and systems, optical memory terminal devices and systems, fixed memory and removable memory.
By way of non-limiting example, the processors 911 and 921 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors, DSPs, and processors based on a multi-core processor architecture.
Although some of the above description is made in the context of a wireless system operating in an unlicensed frequency band, it should not be construed as limiting the spirit and scope of the present disclosure. The principles and concepts of the present disclosure may be applied more generally to other wireless systems.
Furthermore, the present disclosure may also provide a memory containing a computer program as mentioned above, including a machine-readable medium and a machine-readable transmission medium. The machine-readable medium may also be referred to as a computer-readable medium and may include a machine-readable storage medium, such as a magnetic disk, magnetic tape, optical disk, phase change memory, or an electronic memory terminal device such as Random Access Memory (RAM), Read Only Memory (ROM), flash memory device, CD-ROM, DVD, Blu-ray disk, or the like. A machine-readable transmission medium may also be referred to as a carrier, and may include, for example, electrical, optical, radio, acoustic, or other form of propagated signals such as carrier waves, infrared signals, and the like.
The techniques described herein may be implemented by various means, so that a device implementing one or more functions of a corresponding device described with an embodiment includes not only prior art means but also means for implementing one or more functions of a corresponding device described with an embodiment, and it may include separate means for each separate function or means that may be configured to perform two or more functions. For example, these techniques may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or a combination thereof. For firmware or software, implementation can be through modules (e.g., procedures, functions, and so on) that perform the functions described herein.
Example embodiments herein have been described above with reference to block diagrams and flowchart illustrations of methods and apparatus. It will be understood that each block of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations, respectively, can be implemented by various means including computer program instructions. These computer program instructions may be loaded onto a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions which execute on the computer or other programmable data processing apparatus create means for implementing the functions specified in the flowchart block or blocks.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the subject matter described herein, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
It is obvious to a person skilled in the art that with the advancement of technology, the inventive concept may be implemented in various ways. The above-described embodiments are given for the purpose of illustration and not limitation of the present disclosure, and it is to be understood that modifications and variations may be employed without departing from the spirit and scope of the present disclosure as readily understood by those skilled in the art. Such modifications and variations are considered to be within the scope of the disclosure and the appended claims. The scope of the disclosure is defined by the appended claims.

Claims (37)

1. A method implemented at a network node, comprising:
obtaining first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a set of device-to-device D2D communication devices to a receiver of the cellular communication between the network node and the first terminal device;
jointly determining, based on the first channel state information and the second channel state information, a resource allocation for both the cellular communication and the D2D communication of the first terminal device and a first transmission power for the D2D communication such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold, wherein the determining comprises: determining the resource allocation and the first transmission power by solving an optimization problem:
Figure FDA0003501015000000011
Figure FDA0003501015000000012
xj＝0，1
Figure FDA0003501015000000013
wherein
Figure FDA0003501015000000014
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; x if the jth D2D transmitter is allocated the same resource block as the first terminal devicej1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices;
Figure FDA0003501015000000015
representing a channel gain from the jth D2D transmitter in the set of D2D communication devices to the first terminal device and indicated by the second channel state information; pBRepresenting a transmission power of the network node; h isBCRepresenting the channel gain from the network node to the first terminal device and indicated by the first channel state information, γminRepresenting the predefined performance threshold for the first terminal device, and N representing a received noise power at the first terminal device; and
transmitting the determined resource allocation for the cellular communication to the first terminal device.
2. The method of claim 1, wherein the determining is performed under at least one of the following conditions:
the total transmission power for the D2D communications of the set of D2D communication devices is minimized,
physical resource blocks are allocated to no more than one terminal device in said cellular communication with said network node, and
physical resource blocks are allocated to no more than one D2D pair for the D2D communication.
3. The method of claim 1, wherein the determining comprises:
calculating a set of signal-to-interference and noise power ratios, SINRs, for the cellular communication between the first terminal device and the network node based on the first channel state information, the second channel state information, and the adjustable transmission power for the D2D communication; and
selecting a minimum SINR from the calculated set of SINRs above the predefined performance threshold; and
determining the first transmission power for the D2D communication as the transmission power corresponding to the selected minimum SINR.
4. The method of any of claims 1-3, wherein the determined first transmission power is a maximum transmission power allowed for the D2D communication.
5. The method of any of claims 1 to 3, further comprising:
transmitting the determined resource allocation and the first transmission power for the D2D communications to the set of D2D communication devices.
6. The method of any of claims 1 to 3, further comprising:
obtaining third channel state information for a channel from a transmitter of the cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information for a channel of the D2D communication of the D2D communication device;
determining a signal to interference and noise power ratio, SINR, for the D2D communication of the D2D communication device based on the determined first transmission power, the third channel state information and the fourth channel state information; and
transmitting the determined SINR to the D2D communication device.
7. A method implemented at a network node, comprising:
obtaining first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a set of device-to-device D2D communication devices to a receiver of the cellular communication between the network node and the first terminal device;
jointly determining, based on the first channel state information and the second channel state information, a resource allocation for both the cellular communication and the D2D communication of the first terminal device and a first transmission power for the D2D communication such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold, wherein the determining comprises: determining the resource allocation and the first transmission power by solving an optimization problem:
Figure FDA0003501015000000031
Figure FDA0003501015000000032
xj＝0，1
Figure FDA0003501015000000033
wherein
Figure FDA0003501015000000034
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; if the jth D2D senderA transmitter is allocated the same resource block as the first terminal device, xj1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices;
Figure FDA0003501015000000035
represents a channel gain from the jth D2D transmitter to the network node and is indicated by the second channel state information; pCRepresenting the transmission power, h, of the first terminal deviceCBRepresenting the channel gain from the first terminal device to the network node and indicated by the first channel state information, γminRepresenting the predefined threshold for the first terminal device, and N representing a received noise power at the network node; and
transmitting the determined resource allocation for the cellular communication to the first terminal device.
8. The method of claim 7, wherein the determining is performed under at least one of the following conditions:
the total transmission power for the D2D communications of the set of D2D communication devices is minimized,
physical resource blocks are allocated to no more than one terminal device in said cellular communication with said network node, and
physical resource blocks are allocated to no more than one D2D pair for the D2D communication.
9. The method of claim 7, wherein the determining comprises:
calculating a set of signal-to-interference and noise power ratios, SINRs, for the cellular communication between the first terminal device and the network node based on the first channel state information, the second channel state information, and the adjustable transmission power for the D2D communication; and
selecting a minimum SINR from the calculated SINR set above the predefined performance threshold; and
determining the first transmission power for the D2D communication as the transmission power corresponding to the selected minimum SINR.
10. The method according to any of claims 7 to 9, wherein the determined first transmission power is a maximum transmission power allowed for the D2D communication.
11. The method of any of claims 7 to 9, further comprising:
transmitting the determined resource allocation and the first transmission power for the D2D communications to the set of D2D communication devices.
12. The method of any of claims 7 to 9, further comprising:
obtaining third channel state information for a channel from a transmitter of the cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information for a channel of the D2D communication of the D2D communication device;
determining a signal to interference and noise power ratio, SINR, for the D2D communication of the D2D communication device based on the determined first transmission power, the third channel state information, and the fourth channel state information; and
transmitting the determined SINR to the D2D communication device.
13. A method implemented at a terminal device in a device-to-device, D2D, communication controlled by a network node, comprising:
receiving, from the network node, a configuration for the D2D communication and a resource allocation for the D2D communication, the configuration indicating a transmission power or a signal to noise and interference power ratio, SINR, wherein the resource allocation is determined using the method of any of claims 1 to 6 or the resource allocation is determined using the method of any of claims 7 to 12;
selecting a modulation and coding scheme for the D2D communication based on the received configuration; and
implementing the D2D communication according to the resource allocation and the selected modulation and coding scheme.
14. The method of claim 13, wherein the selecting a modulation and coding scheme for the D2D communication based on the received configuration comprises at least one of:
selecting a highest modulation and coding scheme from a predefined set of modulation and coding schemes that can be supported by the configuration; and
selecting a coding scheme not included in the predefined set of modulation and coding schemes if the indicated transmission power or SINR is below a threshold.
15. The method of claim 13, further comprising:
transmitting, to the network node, a first signal and a second signal, the first signal indicating channel state information of a channel from a transmitter of cellular communication to the terminal device, and the second signal indicating channel state information of a channel used for the D2D communication of the terminal device.
16. A network node, comprising:
a first acquisition unit configured to acquire first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a set of device-to-device D2D communication devices to a receiver of the cellular communication between the network node and the first terminal device;
a determining unit configured to jointly determine a resource allocation for both the cellular communication and the D2D communication of the first terminal device and a first transmission power for the D2D communication based on the first and second channel state information such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold, wherein the determining unit is configured to determine the resource allocation and the first transmission power by solving an optimization problem:
Figure FDA0003501015000000061
Figure FDA0003501015000000062
xj＝0，1
Figure FDA0003501015000000063
wherein
Figure FDA0003501015000000064
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; x if the jth D2D transmitter is allocated the same resource block as the first terminal devicej1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices;
Figure FDA0003501015000000065
representing a channel gain from the jth D2D transmitter in the set of D2D communication devices to the first terminal device and indicated by the second channel state information; pBRepresenting a transmission power of the network node; h is a total ofBCRepresenting the channel gain from the network node to the first terminal device and indicated by the first channel state information, γminRepresenting the predefined performance threshold for the first terminal device, and N tableIndicating a received noise power at the first terminal device; and
a first transmitting unit configured to transmit the determined resource allocation for the cellular communication to the first terminal device.
17. The network node according to claim 16, wherein the determining unit is configured to perform the determination under at least one of the following conditions:
the total transmission power for the D2D communications of the set of D2D communication devices is minimized,
physical resource blocks are allocated to no more than one terminal device in said cellular communication with said network node, and
physical resource blocks are allocated to no more than one D2D pair for the D2D communication.
18. The network node of claim 16, wherein the determining unit comprises:
a calculation unit configured to calculate a set of signal-to-interference-and-noise power ratios, SINRs, for the cellular communication between the first terminal device and the network node based on the first channel state information, the second channel state information and the adjustable transmission power for the D2D communication; and
an SINR selection unit configured to select a minimum SINR above the predefined performance threshold from the calculated set of SINRs; and
a power determination unit configured to determine the first transmission power for the D2D communication as the transmission power corresponding to the selected minimum SINR.
19. The network node according to any of claims 16-18, wherein the first transmission power determined by the determining unit is a maximum transmission power allowed for the D2D communication.
20. The network node according to any of claims 16-18, further comprising: a second transmitting unit configured to transmit the determined resource allocation and the first transmission power for the D2D communication to the set of D2D communication devices.
21. The network node according to any of claims 16-18, further comprising:
a second obtaining unit configured to obtain third channel state information of a channel from a transmitter of the cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information of a channel for the D2D communication of the D2D communication device;
an SINR determination unit configured to determine a signal to interference and noise power ratio, SINR, for the D2D communication of the D2D communication device based on the determined first transmission power, the third channel state information, and the fourth channel state information; and
a third transmitting unit configured to transmit the determined SINR to the D2D communication device.
22. A network node, comprising:
a first acquisition unit configured to acquire first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a set of device-to-device D2D communication devices to a receiver of the cellular communication between the network node and the first terminal device;
a determining unit configured to jointly determine a resource allocation for both the cellular communication and the D2D communication of the first terminal device and a first transmission power for the D2D communication based on the first and second channel state information such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold, wherein the determining unit is configured to determine the resource allocation and the first transmission power by solving an optimization problem:
Figure FDA0003501015000000081
Figure FDA0003501015000000082
xj＝0，1
Figure FDA0003501015000000083
wherein
Figure FDA0003501015000000084
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; x if the jth D2D transmitter is allocated the same resource block as the first terminal devicej1, otherwise xj0; n is the number of terminal devices in the D2D set of communication devices;
Figure FDA0003501015000000085
represents a channel gain from the jth D2D transmitter to the network node and is indicated by the second channel state information; pCRepresents the transmission power of the first terminal device, hCBRepresenting the channel gain from the first terminal device to the network node and indicated by the first channel state information, γminRepresenting the predefined threshold for the first terminal device, and N representing a received noise power at the network node; and
a first transmitting unit configured to transmit the determined resource allocation for the cellular communication to the first terminal device.
23. The network node according to claim 22, wherein the determining unit is configured to perform the determination under at least one of the following conditions:
the total transmission power for the D2D communications of the set of D2D communication devices is minimized,
physical resource blocks are allocated to no more than one terminal device in said cellular communication with said network node, and
physical resource blocks are allocated to no more than one D2D pair for the D2D communication.
24. The network node of claim 22, wherein the determining unit comprises:
a calculation unit configured to calculate a set of signal-to-interference-and-noise power ratios, SINRs, for the cellular communication between the first terminal device and the network node based on the first channel state information, the second channel state information, and the adjustable transmission power for the D2D communication; and
an SINR selection unit configured to select a minimum SINR above the predefined performance threshold from the calculated set of SINRs; and
a power determination unit configured to determine the first transmission power for the D2D communication as the transmission power corresponding to the selected minimum SINR.
25. The network node according to any of claims 22-24, wherein the first transmission power determined by the determining unit is a maximum transmission power allowed for the D2D communication.
26. The network node according to any of claims 22-24, further comprising: a second transmitting unit configured to transmit the determined resource allocation and the first transmission power for the D2D communication to the set of D2D communication devices.
27. The network node according to any of claims 22-24, further comprising:
a second obtaining unit configured to obtain third channel state information of a channel from a transmitter of the cellular communication between the first terminal device and the network node to a D2D communication device of the set of D2D communication devices, and fourth channel state information of a channel for the D2D communication of the D2D communication device;
an SINR determination unit configured to determine a signal to interference and noise power ratio, SINR, for the D2D communication of the D2D communication device based on the determined first transmission power, the third channel state information, and the fourth channel state information; and
a third transmitting unit configured to transmit the determined SINR to the D2D communication device.
28. A device in a device-to-device, D2D, end device, comprising:
a receiving unit configured to receive a configuration for the D2D communication and a resource allocation for the D2D communication from a network node, the configuration indicating a transmission power or signal to noise and interference power ratio, SINR, wherein the resource allocation is determined using the method of any of claims 1 to 6 or the resource allocation is determined using the method of any of claims 7 to 12;
a modulation coding scheme selection unit configured to select a modulation and coding scheme for the D2D communication based on the received configuration; and
a D2D communication unit configured to implement the D2D communication according to the resource allocation and the selected modulation and coding scheme.
29. The D2D terminal device of claim 28, wherein the modulation coding scheme selection unit is configured to select the modulation coding scheme by at least one of:
selecting a highest modulation and coding scheme that can be supported by the configuration from a predefined set of modulation and coding schemes; and
selecting a coding scheme not included in the predefined set of modulation and coding schemes if the indicated transmission power or SINR is below a threshold.
30. The D2D terminal device of claim 28, further comprising:
a feedback unit configured to transmit, to the network node, a first signal and a second signal, the first signal indicating channel state information of a channel from a transmitter of cellular communication to the terminal device, and the second signal indicating channel state information of a channel used for the D2D communication of the terminal device.
31. An apparatus implemented at a network node, the apparatus comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
obtaining first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a set of device-to-device D2D communication devices to a receiver of the cellular communication between the network node and the first terminal device;
jointly determining, based on the first channel state information and the second channel state information, a resource allocation for both the cellular communication and the D2D communication of the first terminal device and a first transmission power for the D2D communication such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold, wherein the determining comprises: determining the resource allocation and the first transmission power by solving an optimization problem:
Figure FDA0003501015000000111
Figure FDA0003501015000000112
xj＝0，1
Figure FDA0003501015000000113
wherein
Figure FDA0003501015000000114
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; x if the jth D2D transmitter is allocated the same resource block as the first terminal devicej1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices;
Figure FDA0003501015000000115
representing a channel gain from the jth D2D transmitter in the set of D2D communication devices to the first terminal device and indicated by the second channel state information; p isBRepresenting a transmission power of the network node; h isBCRepresenting the channel gain from the network node to the first terminal device and indicated by the first channel state information, γminRepresenting the predefined performance threshold for the first terminal device, and N representing a received noise power at the first terminal device; and
transmitting the determined resource allocation for the cellular communication to the first terminal device.
32. An apparatus implemented at a network node, the apparatus comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
obtaining first channel state information of a channel between the network node and a first terminal device in cellular communication with the network node, and second channel state information of a channel from a set of device-to-device D2D communication devices to a receiver of the cellular communication between the network node and the first terminal device;
jointly determining, based on the first channel state information and the second channel state information, a resource allocation for both the cellular communication and the D2D communication of the first terminal device and a first transmission power for the D2D communication such that a performance of the cellular communication of the first terminal device is above a predefined performance threshold, wherein the determining comprises: determining the resource allocation and the first transmission power by solving an optimization problem:
Figure FDA0003501015000000121
Figure FDA0003501015000000122
xj＝0，1
Figure FDA0003501015000000123
wherein
Figure FDA0003501015000000124
Representing a transmit power for a jth D2D transmitter in the set of D2D communication devices; x if the jth D2D transmitter is allocated the same resource block as the first terminal devicej1, otherwise xj0; n is the number of terminal devices in the set of D2D communication devices;
Figure FDA0003501015000000125
represents a channel gain from the jth D2D transmitter to the network node and is indicated by the second channel state information; pCRepresenting the transmission power, h, of the first terminal deviceCBRepresenting the channel gain from the first terminal device to the network node and indicated by the first channel state information, γminRepresenting the predefined threshold for the first terminal device, and N representing a received noise power at the network node; and
transmitting the determined resource allocation for the cellular communication to the first terminal device.
33. An apparatus implemented at a terminal device, the apparatus comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
receiving, from a network node, a configuration for D2D communication and a resource allocation for the D2D communication, the configuration indicating a transmission power or a signal to noise and interference power ratio, SINR, wherein the resource allocation is determined using the method of any of claims 1 to 6 or the resource allocation is determined using the method of any of claims 7 to 12;
selecting a modulation and coding scheme for the D2D communication based on the received configuration; and
implementing the D2D communication according to the resource allocation and the selected modulation and coding scheme.
34. An apparatus for communication comprising means for performing a method according to at least one of claims 1 to 12.
35. An apparatus for communication comprising means for performing a method according to at least one of claims 13 to 15.
36. A non-transitory computer-readable memory medium having program code stored thereon, which when executed by an apparatus, causes the apparatus to perform a method according to at least one of claims 1 to 12.
37. A non-transitory computer-readable memory medium having program code stored thereon, which when executed by an apparatus, causes the apparatus to perform a method according to at least one of claims 13 to 15.
CN201680086073.4A 2016-05-25 2016-05-25 Method and apparatus for device-to-device communication Active CN109155921B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2016/083277 WO2017201685A1 (en) 2016-05-25 2016-05-25 Method and apparatus for device to device communication

Publications (2)

Publication Number Publication Date
CN109155921A CN109155921A (en) 2019-01-04
CN109155921B true CN109155921B (en) 2022-05-31

Family

ID=60411110

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201680086073.4A Active CN109155921B (en) 2016-05-25 2016-05-25 Method and apparatus for device-to-device communication

Country Status (2)

Country Link
CN (1) CN109155921B (en)
WO (1) WO2017201685A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200313743A1 (en) * 2019-03-29 2020-10-01 Kt Corporation Method and apparatus for transmitting and receiving reference signal for sidelink channel state information acquisition
CN111010743B (en) * 2019-12-16 2022-02-11 北京理工大学 WiFi system performance guarantee method in unlicensed spectrum duty ratio coexistence mode
EP4075695A4 (en) * 2019-12-31 2022-12-21 Huawei Technologies Co., Ltd. Data feedback method and apparatus
CN116250193A (en) * 2020-08-06 2023-06-09 诺基亚技术有限公司 Complete resource allocation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103024914A (en) * 2012-12-27 2013-04-03 南京邮电大学 Cross-layer design method for downlink resources in D2D (device-to-device) technology sharing system
CN104244265A (en) * 2013-06-13 2014-12-24 北京邮电大学 Communication method and system with D2D communication and cellular communication coexisting in multi-antenna scene
CN104486744A (en) * 2014-12-29 2015-04-01 重庆邮电大学 D2D (device-to-device) mode selection method in small heterogeneous cellular network
KR20150086152A (en) * 2014-01-17 2015-07-27 숭실대학교산학협력단 Method of resource allocation for Device-to Device coommunication in cellular system and apparatus thereof
WO2015137685A1 (en) * 2014-03-11 2015-09-17 엘지전자(주) Method for assigning resources in wireless communication system supporting device-to-device direct communication, and apparatus therefor
CN105451322A (en) * 2015-12-03 2016-03-30 南京邮电大学 Channel allocation and power control method based on QoS in D2D network
CN105554808A (en) * 2016-02-22 2016-05-04 北京邮电大学 D2D (Device-to-Device) resource distribution method and device in cellular network

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665321B1 (en) * 2012-05-15 2017-03-22 Telefonaktiebolaget LM Ericsson (publ) Apparatus and method thereof for setting up device-to-device communication
CN102883451B (en) * 2012-10-12 2015-04-15 南京邮电大学 Cross layer design method of up resources of shared system by terminal direction connection technology

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103024914A (en) * 2012-12-27 2013-04-03 南京邮电大学 Cross-layer design method for downlink resources in D2D (device-to-device) technology sharing system
CN104244265A (en) * 2013-06-13 2014-12-24 北京邮电大学 Communication method and system with D2D communication and cellular communication coexisting in multi-antenna scene
KR20150086152A (en) * 2014-01-17 2015-07-27 숭실대학교산학협력단 Method of resource allocation for Device-to Device coommunication in cellular system and apparatus thereof
WO2015137685A1 (en) * 2014-03-11 2015-09-17 엘지전자(주) Method for assigning resources in wireless communication system supporting device-to-device direct communication, and apparatus therefor
CN104486744A (en) * 2014-12-29 2015-04-01 重庆邮电大学 D2D (device-to-device) mode selection method in small heterogeneous cellular network
CN105451322A (en) * 2015-12-03 2016-03-30 南京邮电大学 Channel allocation and power control method based on QoS in D2D network
CN105554808A (en) * 2016-02-22 2016-05-04 北京邮电大学 D2D (Device-to-Device) resource distribution method and device in cellular network

Also Published As

Publication number Publication date
CN109155921A (en) 2019-01-04
WO2017201685A1 (en) 2017-11-30

Similar Documents

Publication Publication Date Title
EP2753037B1 (en) Method and device for interference control
CN107646198B (en) Reporting for direct link quality assessment
CN109861802B (en) System and method for adaptive transmission in wireless networks
CN105027648B (en) Physical channel design for network assisted D2D
WO2016106604A1 (en) Method and device for transmitting signal
US10932200B2 (en) Uplink power control method and apparatus to reduce user equipment-to-user equipment cross interference
JP2015050575A (en) Radio base station, user terminal, and transmission power control method
KR20100138723A (en) Device and method for controlling uplink transmission power in wireless communication system
US10880906B2 (en) Apparatuses, methods and computer programs for implementing fairness and complexity-constrained a non-orthogonal multiple access (NOMA) scheme
JP6587612B2 (en) Terminal apparatus, base station apparatus, and communication method
EP2989844B1 (en) Method and network node for link adaptation in a wireless communications network
CN106793047B (en) Uplink power control method and base station
CN109155921B (en) Method and apparatus for device-to-device communication
US11343029B2 (en) Method and apparatus for improving resource efficiency in a wireless communication system
WO2018059264A1 (en) Method and device for scheduling transmissions in wireless communication system
US11750349B2 (en) Telecommunications apparatus and methods
WO2021203275A1 (en) Method and apparatus for parameter setting
US11818669B2 (en) Method, apparatus and computer readable media for power control in a wireless communication system
US20190150101A1 (en) Network node and method for ue specific power handling
KR20130104537A (en) Method and apparatud for controlling transmission power of user equipment in wireless communication system
JP2024514131A (en) Defining an association between PRS and SRS to improve multi-RTT positioning in processing capacity-constrained scenarios
EP4316038A1 (en) Ul power control for transport block transmission over multiple slots
WO2015143690A1 (en) Method for measuring channel quality, user equipment, and sending end
JP2020500479A (en) Data transmission method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant