OA19458A - Methods for efficient signaling In V2x communications. - Google Patents

Abstract

Various operations that can be performed by a transmitting UE to schedule radio frequency resources for use in a data transmission are presented. The transmitting UE determines the transmission bandwidth, subject to certain restrictions, such as allowed DFT sizes for the UE for a data transmission. The determination may be performed through autonomous resource selection operations and/or may be performed using information received through signaling received from the network node as part of a scheduling grant. The UE further determines the ALLOCATED BANDWIDTH. The ALLOCATED BANDWIDTH can be determined based on the TRANSMISSION BANDWIDTH, which has been determined, using a defined rule. Furthermore, the UE generates and transmits toward a receiving UE a scheduling assignment (SA) that indicates the number or the set of subchannels that are within, and conform to, the ALLOCATED BANDWIDTH which was determined. The UE can then perform the data transmission using the SA indicated number or set of subchannels. Corresponding operations and methods are presented for a receiving UE.

Description

Inventive concepts will now be described more fully hereinafter with reference to the accompanying drawings, in which examples of embodiments of inventive concepts are shown. Inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complété, and will fully convey the scope of présent inventive concepts to those skilled in the art. It should also be noted that these embodiments are not mutually exclusive. Components from one embodiment may be tacitly assumed to be present/used in another embodiment. Any two or more embodiments described below may be combined in any way with each other.

Various embodiments of the présent disclosure are directed to controlling resource allocation using rules for reducing signaling overhead to schedule data transmission whose transmission bandwidth does not equal the bandwidth of subchannels defined for communication. Operations and methods are provided to détermine rules which control the détermination and communication of a mapping between the transmission bandwidth and allocated bandwidth, so as to reducing signaling overhead in V2X communications between devices.

Various embodiments of the présent disclosure are described without limitation in the context of a communication System shown in the block diagram of Figure 1. The communication system includes UEs that are configured for D2D, V2X, and/or other sidelink communication of packets in accordance with various embodiments ofthe présent disclosure. The communication system can include a radio node 120, a network node 110 (e.g., an eNB), and a plurality of UEs 100. The UEs 100 can be any type of electronic device or wireless communication device configured for D2D and/or V2X communications such as any one or more of: vehicle-to-infrastructure (V2I) communications; vehicle-to-pedestrian (V2P) communications; and vehicle-to-vehicle (V2V) communications. As used herein, D2D is referred to in a broader sense to include communications between any type of UEs, and includes V2X communications between a vehicle and any other type of UE. D2D and/or V2X is or will be a component of many existing wireless technologies when it cornes to direct communication between wireless devices. D2D and/or V2X communications as an underlay to cellular networks hâve been proposed as a means to take advantage of the proximity of communicating devices and at the same time to allow devices to operate in a controlled interférence environment. Typically, it is suggested that such D2D and/or V2X communication may share the same spectrum as the cellular system, for example by reserving some of the cellular uplink resources for D2D and/or V2X purposes. Allocating dedicated spectrum for D2D and/or V2X purposes is another alternative. For D2D and/or V2X communication to occur, the involved wireless device may need the same understanding of uplink subframe timing as the cellular network as they otherwise might overlap in time with cellular transmissions. D2D and/or V2X should support operations for UEs which are out of coverage from the network. Example types of a UE 100 include, but not limited to, a personal data assistant (PDA), tablet computer (e.g., iPAD), mobile terminal, smart phone, smart watch, laptop embedded equipped (LEE), laptop mounted equipment (LME), vehicle mounted communication device, infrastructure mounted communication device, etc.

Although various embodiments are explained in the context of V2X communications, these embodiments can also be used for x2V communications. Accordingly, each use of the term V2X herein can be replaced with the term x2V for disclosure ail of those corresponding embodiments. Similarly, these embodiments can be used for other types of device to device communications, including D2D and other sidelink communications. Accordingly, each use of the term V2X herein can be replaced with the term D2D for disclosure ail of those corresponding embodiments. Moreover, although some embodiments are described in the context of LTE évolution, they may be used in other wireless Systems, including Systems that operate according to 5G standards, also referred to as new radio (NR), or future radio technologies and standards.

The 3GPP has issued agreements conceming NR terminology in the period between the earliest priority date and the filing date of the présent disclosure. NR terminology and LTE terminology coïncide to a considérable extent; for instance, a resource element (RE) remains 1 subcarrier x 1 OFDM symbol. Yet some terms known in LTE hâve been given a new meaning in NR. This disclosure, including the claims, applies préfixés “LTE” and “NR” when indefiniteness could otherwise arise.

A non-prefîxed term in this disclosure is to be understood in the LTE sense unless otherwise stated. However, any term designating an object or operation known from LTE is expected to be reinterpreted functionally in view of NR spécifications. Examples: An LTE radio frame may be functionally équivalent to an NR frame, considering that both hâve a duration of 10 ms. An LTE eNB may be functionally équivalent to an NR gNB, since their fimctionalities as downlink transmitter are at least partially overlapping. The least schedulable resource unit in LTE may be reinterpreted as the least schedulable resource unit in NR. The shortest data set for which LTE acknowledgement feedback is possible may be reinterpreted as the shortest data set for which NR acknowledgement feedback is possible.

Therefore, even though some embodiments of this disclosure hâve been described using LTE-originated terminology, they remain fully applicable to NR technology.

Various embodiments of the présent disclosure are directed to methods and operations for where a UE 100 sends a scheduling assignment (SA) in one fraction of the System bandwidth (BW), e.g., referred to as a SA subchannel, and schedules a data transmission that will span some defined frequency resources, either in the same subframe or in another subframe.

Transmitting UE Operations:

Various operations that can be performed by a transmitting UE 100 (Tx) to schedule radio frequency resources for use in a data transmission are explained below. Figure 4 is a flowchart of operations and methods performed by a transmitting UE 100 (Tx) according to some embodiments. Referring to Figure 4, the transmitting UE 100 (Tx) détermines (block 400) the TRANSMISSION B AND WIDTH (which is subject to restrictions, such as allowed (e.g., supported) DFT sizes for the UE 100 (Tx)) for a data transmission). The détermination (block 400) may be performed through autonomous resource sélection operations and/or may be performed using information received through signaling received from the network node 110 as part of a scheduling grant.

Figure 2 illustrâtes a graph of radio frequency resource bandwidth for transmitting data within a larger range of allocated bandwidth of radio frequency resources, and shows data subchannels and a scheduling assignment (SA) subchannel that is scheduled by a UE 100 using a SA, in accordance with some embodiments. Figure 3 illustrâtes two graphs, each showing alternative embodiments of operations by a UE 100 for using a SA to reserve a SA subchannel, for a data transmission, that is located between adjacent data subchannels, in accordance with some embodiments. The embodiment could also be explained as embodiments of operations by a UE 100 for using an SA subchannel to transmit control information that schedules a data transmission, and the SA subchannel is located in between the data subchannels.

The UE 100 (Tx) détermines (block 402) the ALLOCATED BANDWIDTH. The ALLOCATED BANDWIDTH can be determined based on the TRANSMISSION BANDWIDTH, which has been determined (block 400), using a defined rule. In one embodiment, the defined rule déterminés the ALLOCATED BANDWIDTH to correspond to the smallest number of subchannels in the TRANSMISSION BANDWIDTH, so that the ALLOCATED BANDWIDTH is greater than or equal to the TRANSMISSION BANDWIDTH. For example, as shown in Figure 2, the ALLOCATED BANDWIDTH includes, but is greater than, the TRANSMISSION BANDWIDTH.

The UE 100 (Tx) générâtes and transmits (block 404) toward a receiving UE a SA that indicates the number or the set of subchannels that are within, and conform to, the ALLOCATED BANDWIDTH which was determined (block 402). The UE 100 (Tx) can then perform the data transmission using the SA indicated number or set of subchannels.

Although the phrases TRANSMISSION BANDWIDTH’' and ALLOCATED BANDWIDTH are in some paragraphs shown in ail upper case letters for ease of reference and in other paragraphs shown in lower case letters, it is to be understood that the upper or lower case lettering does not change the meaning or consistency of reference by each of those phrases and does not convey a different interprétation of these phrases beyond their ordinary and customary meaning in view of the présent disclosure. Thus, e.g., TRANSMISSION BANDWIDTH is used interchangeably with transmission bandwidth for convenience.

In some alternative embodiments, the operations shown in Figure 4 for determining (block 400) TRANSMISSION BANDWIDTH and the operations for determining the ALLOCATED BANDWIDTH by the UE 100 (Tx) are performed in the opposite order to that shown. That is, the UE 100 (Tx) may first détermine the ALLOCATED BANDWIDTH and then déterminé the TRANSMISSION BANDWIDTH. In these alternative embodiments, the example of the rule above would become: the TRANSMISSION BANDWIDTH is determined as the largest number of RBs for an allowed DFT size for the UE 100 (Tx) and such that the ALLOCATED BANDWIDTH is greater or equal to the TRANSMISSION BANDWIDTH. For example, the network node 110, e.g., an eNB, may signal the ALLOCATED BANDWIDTH to the UE 100 (Tx) which the UE 100 (Tx) uses to détermine the TRANSMISSION BANDWIDTH.

Figure 5 is a flowchart of these alternative reverse order of operations and methods for determining the TRANSMISSION BANDWIDTH and the ALLOCATED BANDWIDTH, i.e., blocks 400 and 402, performed by the transmitting UE 100 according to some embodiments. Referring to Figure 5, the UE 100 (Tx) détermines (block 500) the ALLOCATED BANDWIDTH responsive to signais received from the network node 110. The UE 100 (Tx) then détermines (block 502) the TRANSMISSION BANDWIDTH as the largest number of RBs for an allowed DFT size and such that the ALLOCATED BANDWIDTH is greater or equal to the TRANSMISSION BANDWIDTH. The UE 100 (Tx) then generates and transmits (block 504) a SA that indicates the number or the set of subchannels that are within, and conform to, the ALLOCATED BANDWIDTH which was determined (block 402).

In some embodiments where the SA subchannel is placed between data subchannels in different ways (such as shown in the right-side graph in Figure 3), the UE 100 (Tx) déterminés where to place the SA subchannel according to a predefîned rule, which in one embodiment places the data subchannel to start from the lower frequency.

Receiving UE Operations:

Corresponding operations and methods that can be performed by a receiving UE 100 (Rx) are explained below with regard to the flowchart of Figure 6, in accordance with some embodiments. Referring to Figure 6, the receiving UE 100 (Rx) détermines (block 600) the ALLOCATED BANDWIDTH for a data transmission based on control signaling that is received. In one embodiment, the receiving UE 100 receives the control signaling by decoding content of a SA that is received from the transmitting UE (Tx) and which indicates a number or a set of subchannels within the allocated bandwidth.

The receiving UE 100 (Rx) détermines (block 602) the TRANSMISSION BANDWIDTH associated with the ALLOCATED BANDWIDTH, which is determined (block 600), based on the rule that is used by the transmitting UE 100 (Tx), which will perform the data transmission, to détermine the ALLOCATED BANDWIDTH based on the TRANSMISSION BANDWIDTH. In a further embodiment, the receiving UE 100 (Rx) détermines the TRANSMISSION BANDWIDTH to correspond to the largest number of RBs for an allowed DFT size and such that the ALLOCATED BANDWIDTH is greater or equal to the TRANSMISSION BANDWIDTH.

The receiving UE 100 (Rx) then décodés (block 604) a signal from a data transmission based on the parameters of the scheduled bandwidth, e.g., transmission bandwidth. In other words, the receiving UE 100 (Rx) uses the determined transmission bandwidth to constrain what radio frequency resources are searched for the signal that is to be decoded.

Potential Advantages of Various Embodiments

Operations and methods disclosed herein may provide an advantage in that the disclosed signaling of the number or subset of SA and/or data subchannels requires less signaling than directly signaling the scheduled resources. The scheduled bandwidth is thereby implicitly determined based on the limitations due e.g. to DFT size, as a function of the indicated subchannels. Radio resources of the communication System are thereby conserved for other uses by these or other UEs, and the UEs may hâve improved operational efficiency by benefiting from knowledge of the scheduled bandwidth.

Example User Equipment

Figure 7 is a block diagram of a UE 100, for use in a télécommunications System, that is configured to perform operations according to one or more embodiments disclosed herein. The UE 100 includes a radio transceiver circuit 720, a processor circuit 700, and a memory circuit 710 containing computer readable program code 712. The UE 100 may fùrther include a display 730, a user input interface 740, and a speaker 750.

The transceiver 720 is configured to communicate with other UEs, which as explained in Figure 1 may correspond to infrastructure mounted devices, vehicle mounted/carried devices, pedestrian camed devices, etc. and the network node 110, through a wireless air interface using one or more of the radio access technologies. The processor circuit 700 may include one or more data processing circuits, such as a general purpose and/or spécial purpose processor, e.g., microprocessor and/or digital signal processor. The processor circuit 700 is configured to execute the computer readable program code 712 in the memory circuit 710 to perform at least some of the operations described herein as being performed by a UE 100. When the UE is a transmitting UE adapted for controlling radio resources used for a data transmission, the operations may include to déterminé the TRANSMISSION BANDWIDTH for the data transmission. Further the operations may include the UE to détermine an ALLOCATED BANDWIDTH and to transmit toward a receiving UE a scheduling assignment that indicates a number or a set of subchannels within the allocated bandwidth. The operation the UE détermines the TRANSMISSION BANDWIDTH may include determining the TRANSMISSION BANDWIDTH based on allowed Discrète Fourier Transform size. The operation that the UE détermines the ALLOCATED BANDWIDTH may include to détermine the ALLOCATED BANDWIDTH based on the transmission bandwidth using a defined rule. Determining the ALLOCATED BANDWIDTH based on the TRANSMISSION BANDWIDTH using a defined rule may include déterminé the allocated bandwidth to correspond to a smallest number of subchannels in the TRANSMISSION BANDWIDTH, so that the ALLOCATED BANDWIDTH is greater than or equal to the TRANSMISSION BANDWIDTH. When the UE is a receiving UE adapted for receiving a data transmission using radio resources, the operations may include the UE to détermine the ALLOCATED BANDWIDTH for a data transmission based on control signaling that is received by the receiving UE. The operations may further include the UE to détermine the TRANSMISSION BANDWIDTH associated with the ALLOCATED BANDWIDTH based on a rule that is used by a transmitting UE, which will perform the data transmission, to déterminé the ALLOCATED BANDWIDTH based on the TRANSMISSION BANDWIDTH and to décodé a signal from the data transmission based on parameters of the TRANSMISSION BANDWIDTH. The ALLOCATED BANDWIDTH for the data transmission is may be determined based on a decoding content of a scheduling assignment that is received from a transmitting UE and which indicates a number or a set of subchannels within the ALLOCATED BANDWIDTH. The TRANSMISSION BANDWIDTH associated with the ALLOCATED BANDWIDTH may be determined to correspond to a largest number of resource blocks for an allowed DFT size and such that the allocated bandwidth is greater or equal to the TRANSMISSION BANDWIDTH.

Example Modules

Figure 8 illustrâtes modules 800 for a transmitting UE (Tx) that perform operations and methods disclosed herein according to some embodiments. The modules 800 include a transmission bandwidth determining module 802, an allocated bandwidth determining module 804, and a SA transmission module 806. The transmission bandwidth determining module 802 is for performing the operations and methods described above for block 400 of Fig. 4 and/or block 502 of Fig. 5. The allocated bandwidth determining module 804 is for performing the operations and methods described above for block 402 of Fig. 4 and/or block 500 of Fig. 5. The SA transmission module 806 is for performing the operations and methods described above for block

404 of Fig. 4 and/or block 504 of Fig. 5.

Figure 9 illustrâtes modules 900 for a receiving UE (Rx) that perform operations and methods disclosed herein according to some embodiments. The modules 900 include an allocated bandwidth determining module 902, a transmission bandwidth determining module 904, and a signal decoding module 906. The allocated bandwidth determining module 902 is for performing the operations and methods described above for block 600 of Fig. 6. The transmission bandwidth determining module 904 is for performing the operations and methods described above for block 602 of Fig. 6. The signal decoding module 906 is for performing the operations and methods described above for block 604 of Fig. 6.

Abbreviations and Explanations:

G Third Génération of Mobile Télécommunications Technology

BSM Basic Safety Message

BW Bandwidth

CAM Cooperative Awareness Message

D2D Device-to-Device Communication

DENM Decentralized Environmental Notification Message

DL Downlink

DSRC Dedicated Short-Range Communications

DFT Discrète Fourier Transform eNB eNodeB

ETSI European Télécommunications Standards Institute

FDMA Frequency-Division Multiple Access

LTE Long-Term Evolution

NW Network

SAE Society of the Automotive Engineers

TDMA Time-Division Multiple Access

TF Transport Format

UE User Equipment

UL Uplink

V2I Vehicle-to-Infrastructure

V2P Vehicle-to-Pedestrian

V2V Vehicle-to-vehicle communication

V2X V ehicle-to-anything-you-can-imagine

GP P Third Génération Partnership Project

Further Définitions and Embodiments:

In the above-description of various embodiments of the présent disclosure, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, ail terms (including technical and scientific terms) used herein hâve the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of this spécification and the relevant art and will not be interpreted in an idealized or overly formai sense unless expressly so defined herein.

When an element is referred to as being connected, coupled, responsive, or variants thereof to another element, it can be directly connected, coupled, or responsive to the other element or intervening éléments may be présent. In contrast, when an element is referred to as being directly connected, directly coupled, directly responsive, or variants thereof to another element, there are no intervening éléments présent. Like numbers refer to like éléments throughout. Furthermore, ' coupled, connected, responsive, or variants thereof as used herein may include wirelessly coupled, connected, or responsive. 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. Welhknown functions or constructions may not be described in detail for brevity and/or clarity. The term and/or includes any and ail combinations of one or more of the associated listed items.

As used herein, the terms comprise, comprising, comprises, include, including , includes, hâve, has, having, or variants thereof are open-ended, and include one or more stated features, integers, éléments, steps, components or functions but does not preclude the presence or addition of one or more other features, integers, éléments, steps, components, functions or groups thereof. Furthermore, as used herein, the common abbreviation e.g., which dérivés from the Latin phrase exempli gratia, may be used to introduce or specify a general example or examples of a previously mentioned item, and is not intended to be limiting of such item. The common abbreviation i.e., which dérivés from the Latin phrase id est, may be used to specify a particular item from a more general recitation.

Example embodiments are described herein with reference to block diagrams and/or flowehart illustrations of computer-implemented methods, apparatus (système and/or devices) and/or computer program products. It is understood that a block of the block diagrams and/or flowehart illustrations, and combinations of blocks in the block diagrams and/or flowehart illustrations, can be implemented by computer program instructions that are performed by one or more computer circuits. These computer program instructions may be provided to a processor circuit of a general purpose computer circuit, spécial purpose computer circuit, and/or other programmable data processing circuit to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, transform and control transistors, values stored in memory locations, and other hardware components within such circuitry to implement the functions/acts specified in the block diagrams and/or flowchart block or blocks, and thereby create means (functionality) and/or structure for implementing the functions/acts specified in the block diagrams and/or flowchart block(s).

These computer program instructions may also be stored in a tangible computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable medium produce an article of manufacture including instructions which implement the functions/acts specified in the block diagrams and/or flowchart block or blocks.

A tangible, non-transitory computer-readable medium may include an electronic, magnetic, optical, electromagnetic, or semiconductor data storage system, apparatus, or device. More spécifie examples of the computer-readable medium would include the following: a portable computer diskette, a random access memory (RAM) circuit, a read-only memory (ROM) circuit, an erasable programmable read-only memory (EPROM or Flash memory) circuit, a portable compact dise read-only memory (CD-ROM), and a portable digital video dise read-only memory (DVD/BlueRay).

The computer program instructions may also be loaded onto a computer and/or other programmable data processing apparatus to cause a sériés of operational steps to be performed on the computer and/or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks. Accordingly, embodiments of the présent disclosure may be embodied in hardware and/or in software (including firmware, résident software, micro-code, etc.) that runs on a processor such as a digital signal processor, which may collectively be referred to as circuitry, a module or variants thereof.

It should also be noted that in some alternats implémentations, the functions/acts noted in the blocks may occur out of the order noted in the floweharts. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Moreover, the functionality of a given block of the floweharts and/or block diagrams may be separated into multiple blocks and/or the functionality of two or more blocks of the flowcharts and/or block diagrams may be at least partially integrated. Finally, other blocks may be added/inserted between the blocks that are illustrated. Moreover, although some ofthe diagrams include arrows on communication paths to show a primary direction of communication, it is to be 5 understood that communication may occur in the opposite direction to the depicted arrows.

Many different embodiments hâve been disclosed herein, in connection with the above description and the drawings. It will be understood that it would be unduly répétitions and obfuscating to literally describe and illustrate every combination and subcombination of these embodiments. Accordingly, the présent spécification, including the drawings, shall be construed 10 to constitute a complété written description of various example combinations and subcombinations of embodiments and of the manner and process of making and using them, and shall support claims to any such combination or subcombination.

Many variations and modifications can be made to the embodiments without substantially departing from the principles of the présent invention. Ail such variations and 15 modifications are intended to be included herein within the scope of the présent invention.

Claims (22)

1. Claim 1. A method by a transmitting user equipment, UE, for controlling radio resources used for a data transmission, the method comprising:

   determining transmission bandwidth for the data transmission;

   determining an allocated bandwidth; and transmitting toward a receiving UE a scheduling assignment that indicates a number or a set of subchannels within the allocated bandwidth;

   wherein determining the transmission bandwidth comprises determining a largest number of resource blocks for a supported Discrète Fourier Transform size such that the allocated bandwidth is greater or equal to the transmission bandwidth.
2. Claim 2. The method of Claim 1, wherein:

   determining the allocated bandwidth is performed before determining the transmission bandwidth.
3. Claim 3. The method of Claim 1, wherein:

   determining the allocated bandwidth comprises a network node signalling the allocated

   15 bandwidth to the transmitting UE.
4. Claim 4. The method of any of the Claims 1 to 3, wherein:

   supported Discrète Fourier Transform sizes are products of powers of 2, 3, 5.
5. Claim 5. A user equipment, UE, for controlling radio resources used for a data transmission, the UE configured to perform

   2® determining a transmission bandwidth for the data transmission;

   determining an allocated bandwidth; and transmitting toward a receiving UE a scheduling assignment that indicates a number or a set of subchannels within the allocated bandwidth:

   wherein determining the transmission bandwidth comprises determining a largest number of resource blocks for a supported Discrète Fourier Transform size such that the allocated bandwidth is greater or equal to the transmission bandwidth.

   ' 2«
6. Claim 6. The UE of Claim 5, wherein:

   determining the allocated bandwidth is performed before determining the transmission bandwidth.
7. Claim 7. The UE of Claim 5 wherein:

   5 determining the allocated bandwidth comprises a network node signalling the allocated bandwidth to the transmitting UE.
8. Claim 8. The UE of any of the Claims 5 to 7 wherein:

   supported Discrète Fourier Transform sizes are products of powers of 2, 3, 5.
9. Claim 9. A method by a receiving user equipment, UE, for receiving a data

   Ί @ transmission using radio resources, the method comprising:

   determining allocated bandwidth for a data transmission based on control signaling that is received by the receiving UE;

   determining transmission bandwidth associated with the allocated bandwidth; and

   15 decoding a signal based on the parameters of the transmission bandwidth;

   wherein determining the transmission bandwidth comprises determining a largest number of resource blocks for a supported Discrète Fourier Transform size such that the allocated bandwidth is greater than or equal to the transmission bandwidth.
10. Claim 10. The method of Claim 9, wherein determining the transmission

    2® bandwidth associated with the allocated bandwidth is based on a rule that is used by a transmitting UE.
11. Claim 11. The method of Claim 9 or 10, wherein the allocated bandwidth for the data transmission is determined based on a decoding content of a scheduling assignment that is received from a transmitting UE and which indicates a number or a 25 set of subchannels within the allocated bandwidth.
12. Claim 12. The method of any of the Claims 9 to 11, wherein determining the allocated bandwidth is performed before determining the transmission bandwidth
13. Claim 13. The method of any of Claims 9 to 12, wherein the decoding uses the transmission bandwidth to constrain what radio frequency resources are searched for 5 the signal that is to be decoded.
14. Claim 14. A user equipment, UE, for receiving a data transmission using radio resources, the UE configured to perform determining allocated bandwidth for a data transmission based on control signaling that is received by the receiving UE;

    determining transmission bandwidth associated with the allocated bandwidth; and decoding a signal from the data transmission based on parameters of the transmission bandwidth;

    wherein determining the transmission bandwidth comprises determining a largest number of resource blocks for a supported Discrète Fourier Transform size such that the allocated bandwidth is greater than or equal to the transmission bandwidth.
15. Claim 15. The UE of Claim 14, wherein determining transmission bandwidth associated with the allocated bandwidth is based on a rule that is used by a transmitting UE.

    2®
16. Claim 16. The UE of Claim 14 or 15, wherein the allocated bandwidth for the data transmission is determined based on a decoding content of a scheduling assignment that is received from a transmitting UE and which indicates a number or a set of subchannels within the allocated bandwidth.
17. Claim 17. The UE of any of the Claims 14 to 16, wherein determining the

    25 allocated bandwidth is performed before determining the transmission bandwidth.
18. Claim 18. The UE of any of Claims 14 to 17, wherein the decoding uses the transmission bandwidth to constrain what radio frequency resources are searched for the signal that is to be decoded.
19. Claim 19. A computer program comprising instructions to be executed by at least one processor of a user equipment, UE, for controlling radio resources used for a data transmission, whereby execution of the program code causes the UE to perform a method according to any one of claims 1 to 4.
20. Claim 20. The computer program of claim 19, wherein the computer program is stored on a computer readable medium.
21. Claim 21. A computer program comprising instructions to be executed by at least one processor of a user equipment, UE, for receiving a data transmission using radio resources, whereby execution of the program code causes the UE to perform a method according to any one of claims 9 to 13.
22. Claim 22. The computer program of claim 21, wherein the computer program is η 5 stored on a computer readable medium.