CN109391976B

CN109391976B - Resource allocation method and user equipment

Info

Publication number: CN109391976B
Application number: CN201810864506.5A
Authority: CN
Inventors: 王轶; 张世昌; 李迎阳
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-08-10
Filing date: 2018-08-01
Publication date: 2024-09-10
Anticipated expiration: 2038-08-01
Also published as: CN109391976A

Abstract

The invention provides a resource allocation method and user equipment, wherein the resource allocation method comprises the following steps: one or more resource pools are configured, and the UE carries out perception detection on each configured resource pool to obtain a detection result; selecting a single time unit resource from a set consisting of the remaining single time unit resources of each resource pool contained in the detection result as a transmission resource; transmitting the data packet to be transmitted carried by the transmission resource through the transmission resource; the single time unit resource is a time-frequency resource formed by N time units and M PRBs and used for transmitting the same data packet, N is more than 1, and M is more than or equal to 1. The invention realizes the high efficiency of resource allocation, thereby improving the transmission performance of the UE.

Description

Resource allocation method and user equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for allocating resources and a user equipment.

Background

In a Long Term Evolution (LTE) system of the 3GPP standardization organization, not only communication (called cellular communication) of a UE terminal with a base station is supported, but also V2X (Vehicle to Vehicle/PEDESTRAIN/Infrastructure/Network) communication is supported by the LTE system. In the V2X system, the UE transmits Scheduling Allocation (SA), time-frequency resources occupied by a data channel, coding modulation scheme (MCS) and other information; and, the UE transmits data on the SA-scheduled data channel. For LTE D2D (Device-to-Device)/V2X systems, the above SA is also called a physical bypass control channel (PSCCH), and the data channel is also called a physical bypass shared channel (PSSCH). The set of PSCCH resources is referred to as a PSCCH resource pool and the set of PSSCH resources is referred to as a PSSCH resource pool.

On one carrier of the V2X system, the subframes occupied by the V2X synchronization channel are removed, and some reserved subframes are removed so that the number of the remaining subframes in one System Frame Number (SFN) period is an integer multiple of the bit mapping length L _bitmap of the configuration resource pool, the TDD (Time Division Duplexing, time division duplex) system also needs to remove all downlink subframes, and the remaining subframe set is recorded as Is the logical number of the remaining subframes. At the collectionOn bit map for length L _bitmap To define a resource pool. When b _k' =1 and k' = kmodL _bitmap, the subframeBelonging to the resource pool, as shown in fig. 1. Therefore, the resource pool of V2X is defined based on logical subframes.

As shown in fig. 2, the PSCCH resource pool and the PSSCH resource pool occupy the same set of subframes. The PSCCH may be located in the same subframe as one of its scheduled PSCCHs. One PSCCH is fixedly mapped onto 2 PRBs. The granularity of allocation of frequency resources is a sub-channel (sub-channel), and one sub-channel contains continuous PRBs, and the number of PRBs is configured by using high-layer signaling. The resources of one device may be occupied by one or more consecutive subchannels. The PSCCH and PSSCH may be occupied consecutive PRBs. The two lowest frequency PRBs in one device's resources occupy one or more consecutive sub-channels are used to carry the PSCCH, while the other PRBs are used to carry the PSSCH. The PRBs of the PSCCH and the psch may also be discontinuous. At this time, the starting PRB positions of the PSCCH resource pool and the PSSCH resource pool may be respectively configured. The PSSCH resource pool still allocates resources with sub-channel granularity. For a device, the index of the occupied PSCCH is equal to the minimum subchannel index of the occupied pscsch.

For data transmission of the UE, each data may be repeatedly transmitted K times, and K resources are correspondingly reserved, where K is greater than or equal to 1, so as to avoid that a part of devices cannot receive the data due to limitation of half duplex operation; the UE may periodically reserve the K resources at a certain reservation interval, so that a plurality of data may be transmitted. According to the detection information in one detection window, the UE can select the K resources that it can occupy, and reserve C periods continuously. One method of detecting resources is to obtain the PSSCH scheduled by the PSCCH based on decoding the PSCCH of other UE, so that the received power PSSCH-RSRP of the corresponding UE can be measured, and thus the resource occupation and/or reservation can be judged based on the received power and the reservation interval in the PSCCH. Another method of detecting resources is to determine resource occupancy and/or reservation based on the received energy S-RSSI. By combining the two methods, the device can avoid transmission with the same resources occupied by other devices as much as possible.

The 3GPP standards organization is standardizing fifth generation (5G) mobile communications, including further enhancements to LTE and new access network technologies (NR). Accordingly, V2X performance may be further enhanced in 5G systems. One direction that needs to be enhanced is beam-based transmission and reception. For example, when V2X operates in a higher frequency band, the transmitting and/or receiving range may be increased by beamforming at the transmitting and/or receiving end, and interference to the non-receiving object terminal may be reduced, thereby improving performance of V2X. The terminal of V2X (hereinafter, abbreviated as UE) described above may include vehicles, pedestrians, and Road Side Units (RSUs), etc. The location of the RSU may be fixed while the locations of the vehicle and pedestrians are variable, and the location of the vehicle may be rapidly changing. In a practical system, the beam may be based only on transmission, and a conventional omni-directional antenna may be still used on reception, as shown in fig. 3 (a), or the beam may be based only on reception, and a conventional omni-directional antenna may be still used on transmission, as shown in fig. 3 (b), or the beam may be based on both transmission and reception, as shown in fig. 3 (c), and the beam capability of reception or transmission may be different, for example, the number of beams to be received or transmitted may be different for different UEs. How to perform efficient resource allocation for the UE and how to perform transmission and reception based on beams are urgent problems to be solved.

Disclosure of Invention

The present invention aims to solve at least one of the above technical drawbacks, and in particular, how to achieve efficient resource allocation, thereby improving the transmission performance of UE.

The invention provides a resource allocation method and user equipment, wherein the resource allocation method provided by the invention comprises the following steps:

Sensing and detecting each configured resource pool to obtain a detection result, wherein the detection result comprises a set formed by the residual single time unit resources of each resource pool;

Selecting a single time unit resource from a set of the remaining single time unit resources of each resource pool as a transmission resource;

transmitting the data packet to be transmitted carried by the transmission resource through the transmission resource;

the single time unit resource is a time-frequency resource formed by N time units and M PRBs and used for transmitting the same data packet, N is more than 1, and M is more than or equal to 1.

Preferably, at least two resource pools are respectively configured according to a plurality of signaling indications; the resources in the at least two resource pools of the configuration are independent; or, the predefined relationship is satisfied between at least two resource pools.

Preferably, one of the at least two resource pools is configured according to a signaling indication, and the other of the at least two resource pools is determined according to the one resource pool and a preset relationship.

Preferably, if a plurality of transmission resource pools are configured, a UE having transmission beam capability may transmit data with different transmission beams within the plurality of transmission resource pools. Within the same transmit resource pool, data is transmitted using the same transmit beam.

Preferably, if a plurality of reception resource pools are configured, a UE having reception beam capability may receive data with different reception beams within the plurality of reception resource pools. Within the same receive resource pool, data is received with the same receive beam.

Preferably, the performing sensing detection on each configured resource pool to obtain a detection result includes:

Receiving a physical bypass control channel PSCCH transmitted by other UE in a perception detection window of a transmission resource pool, and determining time-frequency resources and priorities of a physical bypass shared channel PSSCH according to the PSCCH;

PSSCH-RSRP measurement is carried out on the PSSCH based on the time-frequency resource, and whether the RSRP measurement of each PSSCH is higher than a predefined threshold is determined according to the priority of each PSSCH;

If the RSRP measured value of the PSSCH is higher than a predefined threshold and the corresponding time-frequency resource is located in a resource selection window of the sending resource pool, eliminating the time-frequency resource; if the number of the remaining single time unit resources except the time frequency resources is smaller than a preset threshold, the predefined threshold is increased, and the time frequency resources are removed again until the number of the remaining single time unit resources meets the preset threshold.

Preferably, the excluded time-frequency resources are granularity on each resource pool, and a single time unit resource formed by the N time units and M PRBs for transmitting the same data packet is used.

Preferably, the excluded time-frequency resources are granularity of time-frequency domain resources formed by M PRBs of one time unit in each resource pool.

Preferably, if the remaining time-frequency resources include time-frequency resources that cannot form a single time unit resource granularity, the time-frequency resources are removed.

Preferably, the selecting a single time unit resource from the set of single time unit resources in each resource pool as the transmission resource includes:

calculating the average received energy S-RSSI of the single time unit resources remained in each sending resource pool;

Selecting a preset number of single time unit resources according to the sequence from small to large of each S-RSSI value;

and selecting a single time unit resource from the preset number of single time unit resources as a transmission resource.

Preferably, N time units in the single time unit resource have a predefined pattern relationship.

Preferably, the time difference between the first and the last time units in the N time units in the single time unit resource does not exceed a preset time threshold.

Preferably, the method further comprises:

receiving the PSCCH and/or PSSCH in a receiving resource pool;

N time units in a single time unit resource carrying the PSCCH and/or PSSCH are acquired.

Preferably, the frequency domain relationship of each of the N time units is determined in any of the following cases:

the N time units adopt the same frequency domain resource;

The N time units adopt different frequency domain resources, and the position relationship of each frequency domain resource corresponding to the N time units is preconfigured;

The N time units meet the predefined pattern relation.

Preferably, when the N time units employ different frequency domain resources, the method further comprises:

detecting the frequency domain resource position of each time unit in the N time units;

and determining the position of the PSCCH in each time unit according to the frequency domain resource position.

Preferably, when the predefined pattern relation is not satisfied among the N time units, the method further includes:

Receiving PSCCH and/or PSSCH in at least one time unit in the N time units;

And acquiring indication information of time and/or frequency domain of PSCCH and/or PSSCH of at least one other time unit carried in the PSCCH.

Preferably, the data packets are transmitted by at least one of the following processes;

determining transmission parameters in each resource pool according to the channel busy proportion CBR of the time units in each resource pool;

calculating the resource occupation proportion CR and/or the maximum value of the resource occupation proportion CR in each resource pool respectively;

determining reserved resources for data packet transmission in each resource pool;

And determining whether to discard the reserved resources according to the channel busy proportion CBR and the priority of each resource pool.

Preferably, the data packets to be transmitted are sent and/or received based on the beam.

Preferably, the method comprises the steps of,

The beam directions sent by the group of UE in the corresponding sending resource pools accord with the same rule; or alternatively, the first and second heat exchangers may be,

And a group of UEs, wherein the beam directions received in the corresponding receiving resource pools follow the same rule.

Preferably, any one of the following processes is determined according to the service type:

Configuring a resource pool;

Determining a single time unit resource;

selecting a transmission resource based on the perceptual detection;

the transmit and/or receive beam direction is determined.

The invention also provides a user equipment, comprising:

The first processing unit is used for performing sensing detection on each configured resource pool to obtain a detection result, wherein the detection result comprises a set formed by the residual single time unit resources of each resource pool;

A second processing unit, configured to select a single time unit resource from a set consisting of remaining single time unit resources in each resource pool as a transmission resource;

A sending unit, configured to send a data packet to be transmitted, which is carried by the sending unit, through the sending resource;

The invention realizes the high efficiency of resource allocation, thereby improving the transmission performance of the UE.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic illustration of a resource pool indication mode of LTE V2X in the prior art;

fig. 2 is a schematic diagram of resources of a PSSCH/PSCCH of LTE V2X in the prior art;

fig. 3a is a schematic diagram of transmission and reception of a beam-based V2X UE in the prior art;

Fig. 3b is a schematic diagram of transmission and reception of a beam-based V2X UE according to the prior art;

Fig. 3c is a diagram illustrating transmission and reception of a beam-based V2X UE according to the prior art;

FIG. 4 is a schematic flow chart of a method for resource allocation according to the present invention;

fig. 5 is a schematic diagram of a resource pool configuration of a beam-based V2X UE according to the present invention;

fig. 6 is a second schematic diagram of resource pool configuration of a beam-based V2X UE according to the present invention;

fig. 7 is a schematic diagram of a sensing detection process of a beam-based V2X UE according to the present invention;

fig. 8 is a schematic diagram of a sensing detection process of a beam-based V2X UE according to the present invention;

FIG. 9 is a flow chart of resource selection in the present invention;

FIG. 10 is a schematic diagram of resource selection in accordance with the present invention;

Fig. 11 is a schematic diagram of PSSCH and/or PSCCH combining in accordance with the present invention;

Fig. 12 is a schematic diagram of beam directions of a transmitting UE and a receiving UE in the present invention;

Fig. 13 is a schematic structural diagram of a ue in the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. 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 the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, a "terminal" or "terminal device" includes both a device of a wireless signal receiver having no transmitting capability and a device of receiving and transmitting hardware having receiving and transmitting hardware capable of bi-directional communication over a bi-directional communication link, as will be appreciated by those skilled in the art. Such a device may include: a cellular or other communication device having a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (PerSonal CommunicationS Service, personal communications System) that may combine voice, data processing, facsimile and/or data communications capabilities; a PDA (PerSonal DIGITAL ASSISTANT ) that may include a radio frequency receiver, pager, internet/intranet access, web browser, notepad, calendar and/or GPS (Global PoSitioning SyStem ) receiver; a conventional laptop and/or palmtop computer or other appliance that has and/or includes a radio frequency receiver. As used herein, "terminal," "terminal device" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or adapted and/or configured to operate locally and/or in a distributed fashion, to operate at any other location(s) on earth and/or in space. The "terminal" and "terminal device" used herein may also be a communication terminal, a network access terminal, and a music/video playing terminal, for example, may be a PDA, a MID (Mobile INTERNET DEVICE ) and/or a Mobile phone with a music/video playing function, and may also be a smart tv, a set top box, and other devices.

In the invention, by providing a resource allocation method and user equipment, the UE is provided to more efficiently execute resource selection and perform data transmission and reception under the condition of sending and/or receiving based on wave beams, so as to ensure that the sending UE can cover all expected directions, the receiving UE can correctly receive in the expected directions, and collision among the UEs is further reduced, thereby improving the transmission performance of the UE.

Specifically, in the present invention, a method for allocating resources is provided, as shown in fig. 4, including the following steps:

and step 401, performing sensing detection on each configured resource pool and/or each set of resources to obtain a detection result.

Wherein the detection result comprises a set of remaining single time unit resources of each resource pool.

In this step, when configuring each resource pool, the following three configuration modes are included:

1) Respectively configuring at least two resource pools according to a plurality of signaling indications; the resources in the at least two resource pools of the configuration are independent; or, the predefined relationship is satisfied between at least two resource pools.

2) And configuring one of the at least two resource pools according to a signaling instruction, and determining the other resource pools of the at least two resource pools according to the one resource pool and a preset relation.

3) Configuring at least one resource pool according to one or more signaling indications; a predefined relationship is satisfied between a plurality of resources in at least one resource pool of the configuration.

Specifically, sensing and detecting each configured resource pool and/or each set of resources to obtain a detection result, including:

PSSCH-RSRP measurement is carried out on PSSCH based on time-frequency resources, and whether the RSRP measurement value of each PSSCH is higher than a predefined threshold is determined according to the priority of each PSSCH;

In excluding time-frequency resources, the method comprises the following steps according to the following granularity:

The excluded time-frequency resources are in granularity on each resource pool and/or each group of resources by using a single time unit resource which is formed by the N time units and M PRBs and is used for transmitting the same data packet; or alternatively, the first and second heat exchangers may be,

The excluded time-frequency resources are in granularity by using time-frequency domain resources formed by M PRBs of a time unit in each resource pool and/or each group of resources; or alternatively, the first and second heat exchangers may be,

And if the remaining time-frequency resources contain time-frequency resources which cannot form the granularity of the single time unit resource, removing the time-frequency resources.

Step 402, selecting a single time unit resource from a set of remaining single time unit resources of each resource pool and/or each group of resources as a transmission resource.

The single time unit resource is a time-frequency resource formed by N time units and M PRBs and used for transmitting the same data packet, N is more than 1, and M is more than or equal to 1. The time difference between the first time unit and the last time unit in the N time units does not exceed a preset time threshold; or, the time units in the N time units have a predefined pattern relation; in a preferred embodiment, the predefined pattern relationship is that adjacent time units in the N time units have the same time interval, and of course, the predefined pattern relationship is not limited thereto.

Specifically, selecting a single time unit resource from a set of single time unit resources in each resource pool as a transmission resource includes:

Calculating average received energy S-RSSI of single time unit resources remained in each sending resource pool and/or each group of resources;

Step 403, the data packet to be transmitted carried by the data packet is sent via the sending resource.

Further, in the method provided by the invention, the method further comprises the following steps:

receiving the PSCCH and/or PSSCH in a receiving resource pool; wherein the PSCCH and/or PSSCH are carried over N time units in a single time unit resource.

Further, the frequency domain relationship of each of the N time units is determined in any of the following cases:

1) The N time units employ the same frequency domain resources,

Receiving a PSCCH and/or PSSCH on any one of N time units;

2) The N time units adopt different frequency domain resources, the position relationship of each frequency domain resource corresponding to the N time units is preconfigured,

Receiving a PSCCH and/or PSSCH on any one of N time units;

3) The predefined pattern relationship is satisfied between the N time units,

Receiving a PSCCH and/or PSSCH on any one of N time units;

4) The N time units employ different frequency domain resources,

Detecting the frequency domain resource position of each time unit in N time units;

the location of the PSCCH within each time cell is determined from the frequency domain resource locations.

5) The predefined pattern relationship is not satisfied between the N time units,

Receiving PSCCH and/or PSSCH in at least one time unit in N time units;

Further, in order to maintain stability of the transmission data packet at the time of transmitting the data packet, at least one of the following processes may be adopted;

determining transmission parameters in each resource pool according to the channel busy proportion CBR of time units in each resource pool and/or each group of resources;

Calculating the resource occupation proportion CR and/or the maximum value of the resource occupation proportion CR in each resource pool and/or each group of resources respectively;

Determining reserved resources for data packet transmission in each resource pool and/or each group of resources;

And determining whether to discard the reserved resources according to the channel busy proportion CBR and the priority of each resource pool and/or each group of resources.

The resource allocation method provided by the invention is particularly suitable for beam-based transmission when the transmission and receiving processes are carried out on the data packet to be transmitted through the transmission resource.

For a group of UEs, e.g., UEs within the same area, when a beam is transmitted within a transmit resource pool and/or a resource group and/or received within a receive resource pool,

The group of UE conforms to the same rule in the beam direction sent in the corresponding sending resource pools and/or resource groups; and/or the number of the groups of groups,

The beam directions received by the group of UEs within the corresponding respective receive resource pools and/or resource groups follow the same rules.

Wherein, based on the transmitting direction and/or receiving direction of beam transmission, it can be determined according to the service type; likewise, the configuration of the resource pool, the determination of the single time unit resources, and the selection of the transmission resources based on the perceived detection may all be determined based on the traffic type.

The above-described step division in the embodiments of the present invention is merely an example of the embodiments of the present invention, and the step division for realizing the resource allocation method may not be limited thereto.

The following description will be made with respect to the processing of beam-based transmission, beam-based reception, and beam-based transmission and reception, respectively, in connection with specific practical matters. In the following explanation of the present invention, the designation of a transmitting UE is merely for indicating that the transmitting UE is processing with the transmitting beam capability in the current processing, and the designation of a receiving UE is also merely for indicating that the receiving UE is processing with the receiving beam capability in the current processing.

When the transmission of the UE is a beam-based transmission, the transmitting UE needs to repeatedly transmit one data transmission in a plurality of directions N times for a traffic transmission having a broadcast or multicast property or for a unicast transmission where the location of the receiving UE is not determined. As described above, in the existing LTE system, in order to solve the half duplex problem, each data may be repeatedly transmitted K times. In the present invention, for data transmission of UE, each data may be repeatedly transmitted k×n ₁ times. Correspondingly, the transmitting UE needs to reserve k×n ₁ resources, K is greater than or equal to 1, N ₁ is greater than or equal to 1; the UE may periodically reserve the above k×n ₁ resources at a certain reservation interval, so that multiple data may be transmitted. According to the detection information in one detection window, the UE may select the k×n ₁ resources that it may occupy, and continuously reserve C periods.

When the reception of the UE is beam-based reception, the receiving UE needs to try to receive data in a plurality of directions for an uncertainty of an incoming wave direction of a received signal, for example, an uncertainty of a direction of a transmitting UE, or an uncertainty of a transmitting beam direction of the transmitting UE. Accordingly, in order to ensure correct reception by the receiving UE, the transmitting UE needs to repeatedly transmit N ₂ times in the same transmission direction. Then each data may be repeated K x N ₂ times.

When both transmission and reception of the UE are beam-based, for the direction of the UE that does not determine the reception signal, the transmitting UE needs to repeat transmission N ₂ times in the same direction and transmit in multiple directions, denoted as N ₁ times. Then each data may be repeated K x N ₁*N₂ times.

In an actual system, each UE may have different transmit beam capabilities, as well as receive beam capabilities. For example, some UEs may transmit different beams in different time units in the form of time division, with a total number of beams of 4. Or some UEs may form different reception beams in different time units in a time division manner, and the total number of the reception beams is 8. The UE may report its own beam capabilities to the control node or to the potential receiving UE.

Accordingly, in a specific implementation, there may be various ways how the number of repeated transmissions N ₁,N₂ is determined. For example, for broadcast or multicast transmitted traffic, N ₂ may be determined based on the maximum value of the receive beams of the potential individual receiving UEs. For unicast transmitted traffic, N ₂ may be determined based on the number of receive beams of the unique receiving UE. For another example, in order to maintain the consistency of the transmitting UEs of the whole network, the number of repeated transmissions may be set to be the same, but within the number of repeated transmissions, how many transmissions are of the same transmission beam, different UEs may be different, or the same. For example, when the number of repeated transmissions is set to 4, for a UE having only 2 transmission beam capabilities, one data may be transmitted 2 times on each beam, 2 beams may be sequentially transmitted, for a UE having 4 transmission beam capabilities, 4 beams may be sequentially transmitted 1 time on each beam, for a UE having 8 transmission beam capabilities, 4 beam directions may be selected first, one data may be transmitted 1 time on each beam, 4 beams may be sequentially transmitted, and so on.

The number of repeated transmissions N ₁,N₂ may be a central control node of V2X communication, for example, a base station of a cellular network, or other V2X central control node, and according to practical situations, configures N ₁,N₂ for UEs under its coverage area. The value of N ₁,N₂ may also be predefined by the system, for example, a predefined value may be used for a UE that is not covered by the central control node. Or the sending UE determines the message by itself and directly or indirectly informs the receiving UE.

In the present invention, the description will be mainly made with respect to the design related to N ₁,N₂ or N ₁*N₂ repeated transmissions. The processing of K retransmission transmissions is considered to be the same as the prior art unless otherwise specified, or it is understood that for each of K transmissions, corresponding to N transmissions (e.g., N ₁,N₂, or N ₁*N₂) in the present embodiment, the relationship between K transmissions can be determined in accordance with the prior art and will not be described again. For convenience of description, in this embodiment, k=1 is described, but K may not be greater than 1.

The present invention provides the following four specific embodiments to describe in detail the procedure of the resource allocation method of the V2X UE of the present invention for beam-based transmission and/or reception. Including a resource pool allocation method, a sensing (sensing) method, a method of transmitting/receiving a beam-based V2X signal, and a congestion control method.

Example 1

When the V2X system needs to provide services for the UE based on beam reception, or the transmitting UE is based on beam transmission, the transmitting UE needs to repeatedly transmit N times (k×n times, but for convenience of description, k=1) for one data, for example, n=n ₁, or N ₂, or N ₁*N₂, the resource for transmitting the data may be configured, or preconfigured.

The configuration/pre-configuration of the transmission resource pool may be achieved by:

(1) At the collection On each of which a bit map of length L _bitmap,i is usedTo define Np resource pools. When b _k',i =1 and k' =kmod L _bitmap,i, time Unit (TU)Belonging to the # i resource pool. Herein, a TU may refer to a subframe, a slot, a mini-slot, a symbol, or a concatenated plurality of slots/mini-slots, etc. One slot is a slot containing a certain number of OFDM symbols, one mini-slot shorter than the slot, may contain one or more OFDM symbols. For example, TUs in an LTE V2X system are subframes, containing 14 OFDM symbols.

In one implementation, the configuration of the Np resource pools is independent. For example, the TU locations of the Np resource pools are not limited to correspondence. The length of each resource pool can be different or the same.

In another implementation, the configuration of the Np resource pools is associated. For example, one resource pool is defined, while the other Np-1 resource pools can be uniquely determined according to a predefined relationship. The length of each resource pool is the same.

The configuration of the Np resource pools is indicated by a plurality of signaling, for example, each signaling individually indicates the position of one resource pool, and the Np signaling indicates the resource pools with no constraint relationship. As shown in fig. 5, where np=2. As another example, each signaling individually indicates the location of one resource pool, but the N signaled resource pools need to satisfy a predefined relationship, such as being adjacent.

(2) The configuration of the Np resource pools may be indicated by a signaling. The Np resource pools may share the same set of bit indications and be further differentiated by other methods or parameters.

For example by mapping with bits of length L _bitmap To define a first resource pool and to indicate or pre-specify an offset of the 2,3, … Np resource pools relative to the first resource pool. For example, for the first resource pool, when b _k' =1 and k' =k mod L _bitmap, time Unit (TU)Belonging to the 1 st resource pool, then, in the aggregateAnd (3) offsetting X time units relative to the time units by the time units of the 2 nd resource pool, offsetting X time units relative to the time units of the 2 nd resource pool by the time units of the 3 rd resource pool, and so on. In a special case, x=1, i.e. the time units corresponding to the respective resource pools are immediately adjacent logical time units.

Also for example, in a collectionOn with bit mapping of length L _bitmap To define Np resource pools. Time Unit (TU) when b _k' =1 and k=k mod L _bitmap Belonging to the # i resource pool. The time unit here corresponds to the time resources of Np resource pools. For example, np=4, time unitThe corresponding time granularity is a slot, assuming a length of 7 OFDM symbols. Then, according to a predefined rule, np time resources contained in this time unit are determined, which correspond to Np resource pools. For example, as shown in fig. 6, the 1 st, 2 nd, and last symbol of the 7 symbols are predefined to be vacated, and then the 3 rd, 4 th, 5 th, and 6 th symbols are time units of the 1 st, 2 nd, 3 rd, and 4 th resource pools, respectively. Or further configured, in the 7 symbols, the location information of Np time resources, for example indicated by 7 bits, which 4 symbols correspond to the time units of the 1 st, 2 nd, 3 rd and 4 th resource pools, respectively.

(3) At the collectionOn top of that, nq bits with length L _bitmap,i are mappedTo define Nq resource pools. When b _k',i =1 and k' =kmod L _bitmap,i, time Unit (TU)Belonging to the # i resource pool. Herein, a TU may refer to a subframe, a slot, a mini-slot, a symbol, or a concatenated plurality of slots/mini-slots, etc. One slot is a slot containing a certain number of OFDM symbols, one mini-slot shorter than the slot, may contain one or more OFDM symbols. For example, TUs in an LTE V2X system are subframes, containing 14 OFDM symbols.

Within one resource pool, np sets of resources are allocated according to a predefined pattern, or according to a configured pattern.

For example, for a resource pool, by mapping with bits of length L _bitmap A first set of resources within the one resource pool is defined and an offset of the 2,3, … Np set of resources relative to the first set of resources is indicated or predefined. For example, for a first set of resources, when b _k' =1 and k' =k mod L _bitmap, time Unit (TU)Belonging to group 1 resources, then, in aggregateAnd (3) offsetting X time units from the time units by the time units of the 2 nd group of resources, offsetting X time units from the time units of the 2 nd group of resources by the time units of the 3 rd group of resources, and so on. In a specific example, x=1, i.e. in one resource pool, the time units corresponding to each group of resources are immediately adjacent logical time units.

Also for example, in a collectionOn with bit mapping of length L _bitmap To define Np sets of resources within a resource pool. When b _k' =1 and k' = kmod L _bitmap, time Unit (TU)Belonging to this resource pool. One time unit here corresponds to Np time resources in this resource pool. For example, np=4, time unitThe corresponding time granularity is a slot, assuming a length of 7 OFDM symbols. Then, according to a predefined rule, np time resources contained in this time unit are determined, which correspond to Np sets of resources. For example, as shown in fig. 6, the 1 st, 2 nd, and last symbol of the 7 symbols are predefined to be free, and then the 3 rd, 4 th, 5 th, and 6 th symbols are one time unit of the 1 st, 2 nd, 3 rd, and 4 th group resources, respectively. Or further, in the 7 symbols, the location information of Np time resources is indicated, for example, by 7 bits, which 4 symbols correspond to the time units of the 1 st, 2 nd, 3 rd and 4 th groups of resources, respectively.

In the above method, service is provided for the UE based on beam reception, or the transmitting UE is based on beam transmission, np transmission resource pools may be configured for the transmitting UE or Np sets of transmission resources may be configured in the same resource pool, and/or Np reception resource pools may be configured for the receiving UE or Np sets of reception resources may be configured in the same resource pool.

Preferably, the configured receiving resources are in one-to-one correspondence with the sending resource pools and/or sending resource groups, and the number of the configured receiving resource pools and/or receiving resource groups is equal to the number of the sending resource pools and/or sending resource groups.

Preferably, the configuration of the sending resource pool and/or the resource group and the receiving resource pool and/or the resource group are independent, and the number may be unequal. For example, the base station may configure 2 transmission resource pools for the transmitting UE, where the frequency domain resources of the two transmission resource pools are the same and the time resources are different, and may configure one reception resource pool for the receiving UE, where the reception resource pool corresponds to a union of the two transmission resource pools.

Preferably, the signaling design for configuring the receiving resource pool and/or the resource group may refer to the signaling design for configuring the sending resource pool and/or the resource group in this embodiment, which will not be described in detail.

Preferably, the multiple resource pools and/or resource groups are configured independently or jointly, and how to configure the resource pools and/or resource groups is related to the delay of sending a data packet by the UE, the flexibility of sending the data packet by the UE, and the like.

Preferably, if multiple transmit resource pools and/or resource groups are configured, a UE with transmit beam capability may transmit data with different transmit beams within the multiple transmit resource pools and/or resource groups. Data is transmitted in the same transmit resource pool and/or resource group using the same transmit beam.

Preferably, if multiple receive resource pools and/or resource groups are configured, a UE with receive beam capability may receive data with different receive beams within the multiple receive resource pools and/or resource groups. Data is received with the same receive beam within the same receive resource pool and/or resource group.

Preferably, in order to make the behaviors of UEs consistent within a certain range, a group of UEs may be configured with the same Np resource pools and/or resource groups, for example, UEs within the same area.

Preferably, the directions of the transmittable beams of the UEs within a certain range follow the same rule in the corresponding Np transmission resource pools and/or resource groups. For example, all UEs transmit the same data packet in the directions of east, south, west and north in the ith time unit of the nth group resource of 2 nd, 3 rd and … th, respectively, from the ith time unit of one resource pool.

Preferably, the beam directions for reception follow the same rule within a range of UEs within a corresponding N number of reception resource pools and/or resource groups. For example, all UEs receive the same data packet from the ith time unit of the 1 st group of resources in one resource pool in the directions of east, south, west and north in turn at the ith time unit of the 2 nd, 3 rd and … th Np group of resources.

Preferably, the rule of the beam directions sent by each UE may be different in the corresponding Np sending resource pools and/or resource groups. This is especially true in the case where the transmit beam capabilities of the individual UEs are different. For example, one UE may send the same data with Np directional beams in the ith time unit of the Np resource pools, and another UE may send the same data with Np/2 directional beams in the ith time unit of the Np resource pools, that is, may send 2 times in the same direction, and for an omni-directional UE, all Np time units in the Np resource pools omni-directionally send the same data.

Preferably, the rules of the reception beam directions of the respective receiving UEs may be different within the corresponding Np reception resource pools and/or resource groups. This is especially true in the case where the reception beam capabilities of the respective receiving UEs are different. For example, one receiving UE may receive the same data with Np directional beams in the ith time unit of the Np resource pools, and another UE may receive the same data with Np/2 directional beams in the ith time unit of the Np resource pools, that is, may receive 2 times in the same direction, and for an omni-directional receiving UE, all N time units in the Np resource pools omni-directionally receive the same data.

For UEs with a central control node, e.g. under the coverage of a cellular network base station or under the coverage of a central control node of a V2X network, the resource pool and/or resource group is configured by the central node or predefined by the standard. In the absence of coverage by the central control node, the resource pool and/or resource group is standard predefined, or is relayed by or is self-determined by the transmitting UE in the coverage of the central control node, and is signalled to the receiving UE in a predefined form.

The Np resource pools may not overlap with other V2X resource pools, partially overlap or completely overlap.

For different phases in V2X communication, the base station may configure different Np _i resource pools and/or resource groups for the UE. For example, when a connection is switched or RRC is established, one set of resource pools is used, where the set of resource pools includes Np ₁ resource pools, and when RRC connection establishment is completed, another set of resource pools is used, where the set of resource pools includes Np ₂ resource pools. Wherein Np ₁ resource pools and/or Np ₂ resource pools may be determined separately according to the method of the present embodiment. Np ₁＝Np₂, or Np ₁ is not equal to Np ₂. The operations of the sets of resource pools are contradictory and the operations of selecting resources in the respective resource pools are also independent. Other embodiments of the present invention are equally applicable to each set of resource pools.

Preferably, the PSSCH and the PSCCH share the same pool of transmit and/or receive resources and/or resource groups.

Preferably, the PSSCH and PSCCH individually configure a transmit and/or receive resource pool and/or resource group. For example, the method defined in the first embodiment is only used for the resource pool determination of the PSCCH, and the resource pool determination of the PSCCH may be the prior art.

Example two

After determining the resource pool and/or the resource group, the transmitting UE performs sensing (sensing) on the resources in the transmitting resource pool, and selects the resources available for actual transmission based on the sensing result. In this way, collisions between different UEs can be better avoided or reduced. In the V2X system of LTE, the UE performs transmission resource selection according to the following steps (see section 14.1.1.6 in TS 36.213):

Step1: the V2X UE determines the time-frequency resource location and priority of the scheduled PSCCH by receiving PSCCHs transmitted by other UEs within the sensing detection window.

The other UEs may be UEs of the same type or UEs of different types.

Step2: the V2X UE detects the demodulation reference channel received power of the scheduled PSSCH (referred to as a PSSCH-RSRP measurement) and excludes resources within the resource selection window that correspond to PSSCH-RSRP above a certain threshold. As shown in fig. 7, the PSSCH within the sensing detection window performs RSRP measurement, and if RSRP is higher than a specific threshold, the resources corresponding to this PSSCH that may occur within the resource selection window are excluded. If the proportion of the residual resources is less than 20% of the total resources in the resource selection window, the specific threshold is increased by 3dB, and the step is re-executed until the proportion of the residual resources is not less than 20%.

Step3: the V2X UE calculates an average received energy (S-RSSI) of the remaining resources within the resource selection window and randomly selects one resource from among the partial resources having the lowest S-RSSI as a transmission resource. As shown in fig. 8, the remaining resources are sequentially selected from the remaining resources according to the order of from small to large S-RSSI until the proportion of all the selected resources to the total resources in the resource selection window is not less than 20%. And randomly selecting one resource from the selected resources as a transmission resource.

When the UE is beam-based in transmission or beam-based in reception, the above steps are simply repeated, and it cannot be ensured that the UE in all directions can better avoid collision. Also, for a UE based on beam reception, it is necessary to have the transmitting UE consider this problem when selecting transmission resources. To solve the above problem, the UE may perform the sensing detection according to at least one of the following methods:

For convenience of description, the resources in Np (np=1 or np=n) resource pools and/or resource groups for transmitting the same data packet are referred to as one 'single time unit resource' (concept corresponding to existing single-subframe resource of LTE) Si of the ith data packet. The single time unit resource Si includes N time units, and the frequency domain includes M PRBs, that is, m×n PRBs in total. For example, the time domain dimension of the single time unit resource Si is one slot, and the N time units respectively correspond to one OFDM symbol or one mini slot. Or the single time unit resource Si is a plurality of time slots, and N time units respectively correspond to one time slot. For example, the frequency domain dimension of the single time unit resource Si requires that the M PRBs of the N time units satisfy a predefined relationship, e.g. are the same, or satisfy a predefined pattern relationship, or that the frequency domain dimension of the single time unit resource Si does not define the relationship of the M PRBs of the N time units.

Mode one: the UE performs steps 1 to 3 in a plurality (Np > 1) of transmission resource pools and/or resource groups, respectively. The selected N time units and M PRBs form a single time unit resource, and the time difference from the first time unit to the last time unit in the N time units in the time dimension is required to be not more than a predefined time threshold so as to meet the time delay requirement of V2X service.

Preferably, the M PRBs in the N time units need to satisfy a predefined relationship, for example, the M PRBs occupying the same space in the N time units, or are not limited.

If a sufficient number of such single time unit resources cannot be selected in step2 or step3, then the requirements need to be relaxed, e.g., the RSRP threshold is increased in step2 to meet the requirements. In a specific implementation, the number of time units reserved in Np resource pools may not be limited to be the same in step2, and no time delay limitation is made, but when transmission resources are selected randomly in step3, time units that may constitute a single time unit resource need to be limited, and M PRBs of N time units are selected so that a time difference from a first resource to a last resource of N time units does not exceed a predefined time threshold. Or when reserving resources in step2, reserving resources for granularity according to a single time unit resource defined by a time delay. For example, in the resource selection window, the time units where the resources of at least one group of M PRBs do not exceed the RSRP threshold are #1, #2, #3, #4, #5, #10, #15, #16, #21, #26, #27, #32, #51, #52, #53. Let n=4 and the maximum delay cannot exceed 20ms. Then, time units #1, #2, #3, #4, #5, #10, #15, #16, #21, #26, #27, #32 can be reserved for step3, while time units #51, #52, #53 cannot be reserved because these three time units cannot form a single time unit resource with any other time unit so that the time difference is less than 20ms.

Or if only one resource pool and/or resource group is defined, np=1, then the sensing detection is performed in this resource pool, N time units are selected, and M PRBs are used as a single time unit resource. The time difference between the time starting point and the time ending point of the selected N time units is required to be not more than a predefined time threshold so as to meet the time delay requirement of the V2X service. And, the selected N time units are not in the same time unit to support the transceiving of the receiving UE capable of generating only one receiving beam in one time unit or the transmitting UE capable of transmitting only one beam in one time unit. Preferably, the M PRBs in the N time units need to satisfy a predefined relationship, for example, the M PRBs occupying the same space in the N time units, or are not limited.

For example, when only the transmitting UE is considered to support a plurality of transmitting beams, but the receiving UE does not support a plurality of receiving beams, or is not optimized for the receiving beams of the UE, the base station configures N transmission resource pools for the transmitting UE, where N is determined according to the number N ₁ of the transmitting beams of the transmitting UE (n+.n ₁). Then, the UE performs sensing detection in the N transmission resource pools, and selects N resources (single time unit resources of n×m PRBs in total) for transmission.

For example, consider that a transmitting UE supports multiple transmit beams and a receiving UE supports multiple receive beams, a base station configures N transmit resource pools and/or resource groups for the transmitting UE, where N is determined based on the number of transmit beams of the transmitting UE, N ₁, and the base station's assumption of the receive beams of the potential receiving UE (n+.n ₁*N₂). Then, the UE performs a sensing detection in the N transmission resource pools and/or the resource groups, respectively, and selects N resources (single time unit resources of n×m PRBs in total) for transmission.

Mode two: and the transmitting UE performs step 1-step 3 on the Np resource pools and/or resource groups in a plurality of (Np > 1) transmitting resource pools and/or resource groups according to a predefined pattern relation. The predefined pattern relationship is used for defining the same data packet, and the time resource position or the time and frequency domain resource position transmitted in Np resource pools and/or resource groups. For example, the N time units for a set of resources Si are: n time units with an interval X in the resource pool (x=1 indicates adjacency), but the starting point of the set of resources Si is not limited. Or for example, the N time units of a set of resources Si are N time units within a resource pool, spaced by X, and the starting point of the set of resources Si (e.g. the time unit of the first resource pool) meets certain requirements, e.g. is a multiple of N or meets a multiple of N and a predefined offset. The starting point is the logical number, or the physical number, of the time unit.

Preferably, the PRBs occupied by the group of PRBs in the N time units have no constraint relationship. For example, the same PRB is occupied in N time units. It is assumed that 100 groups of PRBs can be divided in each time unit, each group of PRBs being m=10 PRBs. Then, each single time unit resource is 10×n PRBs, and corresponds to a resource formed by combining 10 PRBs of the kth group in all the ith time units in the N time units, where i=1, 2, … N, ki=1, 2, …. It will be appreciated that for a set of N time units, 10N single time unit resources may be defined.

Preferably, the PRBs occupied by the set of PRBs in N time units have a constraint relationship, for example, the same PRBs are occupied in N time units. It is assumed that 100 groups of PRBs can be divided in each time unit, and each group of PRBs is 10 PRBs. Then, each single time unit resource is 10×n PRBs, corresponding to 10 PRBs of the i-th group in the N time units.

As shown in fig. 9, resource selection is performed by three steps:

Step 901: the V2X UE determines the time-frequency resource location and priority of the scheduled PSCCH by receiving PSCCHs transmitted by other UEs within the sensing detection window.

The other UEs may be UEs of the same type or UEs of different types.

Step 902: the V2X UE detects PSSCH-RSRP of the scheduled PSSCH, excludes resources corresponding to the PSSCH-RSRP being higher than a specific threshold in a resource selection window, and reserves resources with single time unit resources as granularity. For example, if the proportion of the remaining single time unit resources to the total single time unit resources in the resource selection window is less than a predefined threshold, the specific threshold is raised by 3dB, and the step is re-executed until the proportion of the remaining single time unit resources is not less than the threshold.

Step 903: the V2X UE calculates the average received energy (S-RSSI) of each remaining single time unit resource within the resource selection window, that is, averages the S-RSSI of m×n PRBs of the single time unit resource Si to obtain the S-RSSI _{i_ave}, sorts all remaining resources in the order from small to large of the average S-RSSI _{i_ave}, and randomly selects one single time unit resource from the lowest part of the single time unit resources of the S-RSSI _{i_ave} as a transmission resource. For example, the method sequentially picks up the remaining resources according to the order of the S-RSSI _{i_ave} from small to large until the proportion of all the picked up resources to the total resources in the resource selection window is not lower than a predefined threshold, and randomly selects one resource from the picked up resources as a transmission resource.

An exemplary flow is given below to achieve the effects of steps 901-903 above:

Step1: the UE respectively tries to detect PSCCH in induction detection windows in Np sending resource pools and/or resource groups, and determines the time-frequency resource position and priority of the PSSCH scheduled in the Np sending resource pools and/or the resource groups; or attempting to detect the PSCCH in only a portion of the sensing detection window of the transmit resource pool and/or resource group and determining a time-frequency resource location and priority of the PSSCH for which the PSSCH schedule was detected, and other time-frequency resource locations and priorities of the PSSCH in the transmit resource pool and/or resource group, by the detected PSCCH.

Step2: the UE detects PSSCH-RSRP of the scheduled PSSCH in Np resource pools and/or resource groups and excludes single time unit resources within the resource selection window corresponding to PSSCH-RSRP above a certain threshold (this single time unit resource exclusion if the sub-channel corresponding to PSSCH-RSRP above the certain threshold overlaps with the single time unit resources). That is, a single time unit resource reservation that will meet the requirements is reserved for step3. If some time-frequency resources are not above the RSRP threshold, but the relationship of these time-frequency resources does not conform to the predefined pattern relationship, they cannot be composed or belong to a single time unit resource. Such resources are also excluded.

In one implementation manner, the UE may perform PSSCH-RSRP measurement on the PSCCH received by step1 in Np transmission resource pools and/or resource groups, and exclude resources corresponding to the PSSCH-RSRP being higher than a specific threshold, to obtain resources respectively available in Np transmission resource pools. The UE reserves only the resources of Np transmission resource pools and/or the resources of the respective corresponding resources in the resource group that satisfy the predefined pattern relation (i.e. the reserved resources are of a single time unit granularity) for step3, i.e. all the resources that do not satisfy the predefined pattern relation are excluded. For example, the predefined pattern relationship for a single time unit resource is N adjacent time units in the time dimension. If n=4 resource pools, in the first resource pool, time units not higher than the RSRP threshold are #1, #5, #21, #49, in the second resource pool, time units not higher than the RSRP threshold are #2, #10, #26, #50, in the third resource pool, time units not higher than the RSRP threshold are #3, #15, #27, #35, #51, and in the fourth resource pool, time units not higher than the RSRP threshold are #4, #16, #32. Then, of the four resource pools, only time units #1, #2, #3, #4 satisfy the predefined pattern relationship, and one single time unit may be composed, and thus be reserved. Or the UE directly eliminates and reserves the time-frequency resources by taking a single time unit as granularity.

Note that in one time unit, multiple groups of PRBs may be contained. If all PRB groups in a time unit exceed the RSRP threshold, all resources for that time unit are considered to be excluded. If only part of the PRB groups exceed the RSRP threshold, only those PRB groups are excluded and the resources of the other PRB groups of this time unit are reserved.

In another implementation, the UE may perform PSSCH-RSRP measurements on PSSCH _i,1 in the first transmit resource pool and/or resource group in sequence according to the PSCCH received by step 1. If PSSCH-RSRP of PSSCH _i,1 is above the threshold, then all other frequency domain resources in the time units in the same single time unit and/or resource group belonging to the same single time unit within the resource selection window corresponding to PSSCH _i,1 need not be RSRP measured, and all time-frequency resources of the single time unit Si are excluded. If PSSCH-RSRP of PSSCH _i,1 is not above the threshold, checking time-frequency resources in a second pool of transmission resources belonging to the same single time unit Si as the PSSCH _i,1, and if PSSCH _i,2 is present, performing PSSCH-RSRP measurement. And so on. If all time-frequency resources of a single time unit Si in Np transmit resource pools and/or resource groups do not exceed the RSRP threshold, this single time unit may be preserved. This single time unit is excluded if at least one of the time units exceeds the RSRP threshold.

The above are all schematic treatments. The invention does not exclude other methods adopted by the UE to achieve the effects described in the invention.

If in step2 the proportion of the remaining single time unit resources to the total single time unit resources in the resource selection window is less than thr_step2, e.g. thr_step2 = 20%, the specific threshold is raised by 3dB and the step is re-performed until the proportion of remaining resources is not less than thr_step2.

Step3: the UE averages the S-RSSIs of each single time unit Si of the rest resources in the resource selection window in Np sending resource pools and/or resource groups, sorts each single time unit according to the order from the average S-RSSI _{i_ave} to the large, and randomly selects one single time unit S _j from the part of single time unit resources with the lowest S-RSSI _{i_ave} as the sending resource.

For the second mode, when there is only one transmission resource pool and/or resource group, np=1, then the sensing is performed in this transmission resource pool, and the selection resource is also based on the granularity of the single time unit resource defined above, and the finally selected single time unit resource satisfies the predefined pattern relationship, or the time of the first and last time units of the single time unit resource does not exceed the preset time threshold. Thus, in step1 described above, detecting the PSCCH in this transmit resource pool determines the PSSCH. In step2, if there are remaining time units in the resource pool, #1, #2, #3, #4, #5, #10, #15, #16, #21, #26, #27, #32, #51, #52, # 53. Then the UE can only select #1, #2, #3, #4 (if the starting point of the single time unit resource can only be 4x+1, x is a positive integer) or #1, #2, #3, #4 and #2, #3, #4, #5 (if the starting point of the single time unit resource can be any time unit in the transmission resource pool) other remaining time units are excluded. Fig. 9 gives an example. For convenience of description and illustration, it is assumed that each single time unit resource includes 4 logically adjacent 4 time units in the transmission resource pool, each single time unit resource starts with 4x+1, each time unit includes M PRBs, the positions of the M PRBs are the same, and the M PRBs of each single time unit resource are not overlapped with each other. It is assumed that each time unit is divisible into 5 groups of M PRBs. As shown in fig. 10, there are time-frequency resources in time units of #1 to #5, #10, #15, #16, #21, #26, #29 to #32, #49 to #52, where RSRP measurement is not performed (PSCCH is not detected) and RSRP threshold is not exceeded. Wherein #1 to #4, and #29 to 32, #49 to 52 may constitute a single time unit resource. In #1 to #4, 4 groups of M PRBs are satisfied, 5 groups of M PRBs in #29 to #32 are satisfied, and 4 groups of M PRBs in #49 to #52 are satisfied, so that 13 single time unit resources can be reserved in step 2. Other time unit resources may be excluded. It is assumed that the total number of single time unit resources required to be reserved is at least 2% of the total number of single time unit resources within the resource selection window (typically this number will not be too small, e.g. 20%. For ease of illustration, here it is assumed to be 2%). The resource selection window length is 100 time units, and the total number is 125 single time unit resources. The resources that need to be reserved contain at least 25 single time unit resources. Therefore, the RSRP threshold needs to be raised, and some resources are selected to meet at least 25 requirements. These 25 resources are then used for step3 RSSI measurements. Taking the first single time unit resource of #1 to #4 as an example, all the RSSI of the 1 st to M th PRBs of #1 to #4 need to be averaged. After step3, the 4m+1 to 5M PRBs with single time unit resources #29 to #32, which are finally randomly selected by the UE, are transmission resources. Note that for ease of illustration, the perception detection window is not presented, only the resource selection window is presented. Those skilled in the art will appreciate that the UE excludes resources in the resource selection window by sensing the detection result in the detection window. Also, although M PRBs of a single time unit resource in fig. 10 are not overlapped, the present invention is also applicable to a case where M PRBs of each single time unit resource are overlapped with each other. if the transmitting UE does not have a receive beam, the sensing by the transmitting UE in Np resource pools or in different time units in one resource pool is omni-directional.

If the transmitting UE is provided with a receive beam, the perceived detection by the transmitting UE at different time units in Np resource pools and/or resource groups may be in different directions. For example, the transmitting UE supports reception of 2 beams, transmission of 4 beams, and n=4. Then the UE uses the same directional receive beam in 2 of the resource pools. The reception of beams in the same direction in the two resource pools can be reserved as the implementation of the UE, or configured by the base station, or preset by the system. Similarly, when the UE actually transmits, if the UE repeatedly transmits 4 times, the base station configuration or the system may be preset, so that the beam of the receiving UE may correspond to, for example, the same transmission beam is adopted every 2 times when transmitting, and the 2 transmissions just correspond to the receiving UE adopting different reception beams.

If the transmit and receive beams of the UE have reciprocity, i.e. the spatial characteristics of the transmit and receive beams are strongly correlated, the direction of perceived detection may be determined from the transmit beam of the UE. In order to reduce the complexity of the UE, it is preferable to make the UE perform the sensing detection only on the direction of each transmission beam and the opposite direction of the transmission beam.

Example III

The first and second embodiments mainly describe a transmitting UE. In order to ensure normal V2X communication, a corresponding constraint needs to be made to the receiving UE.

Preferably, if N time units of the transmission resource (single time unit resource) of the transmitting UE are predefined or configured to use the same frequency domain resource, then for the receiving UE, if this UE receives one PSCCH on one time unit, the receiving UE can infer the frequency domain resource of the other N-1 time units. The frequency domain resource indication information in the other N-1 time units of PSCCH may not be relied upon for display. The frequency domain resource is PSCCH and/or PSSCH.

Preferably, if N time units of transmission resources (single time unit resources) of the transmitting UE are predefined or configured to employ different frequency domain resources, a specific positional relationship of the N frequency domain resources is predefined or configured. Then, for a receiving UE, if this UE receives a PSCCH for one of the time units, it is possible for the receiving UE to infer the frequency domain resources for the other N-1 time units. The displayed frequency domain resource indication information may not be relied upon. The frequency domain resource is PSCCH and/or PSSCH.

Preferably, if N time units of transmission resources (single time unit resources) of the transmitting UE are predefined or configured to employ different frequency domain resources, and the specific positional relationship of the N frequency domain resources is not limited. Then the receiving UE can only attempt to detect all possible frequency domain resource locations for each time unit of a single time unit resource or for each time unit within the resource pool to determine the location of the PSCCH within each time unit.

Preferably, if the predefined pattern relation is satisfied between N time units of the transmission resource (single time unit resource) of the transmitting UE, the receiving UE may infer the time units and/or frequency domain information of other N-1 transmissions after receiving one PSCCH on one time unit, and may not rely on the displayed time unit indication information. For example, the time cell indication information in the other N-1 time cells PSCCH, or the PSCCH does not carry indication information about the N time cells.

Preferably, if the N time units of the transmission resource (single time unit resource) predefined or configured for the transmitting UE do not satisfy the predefined pattern relation, the transmitting UE may include indication information indicating the time and/or frequency domain of at least one other time unit in the PSCCH transmitted in at least one time unit.

Preferably, when the receiving UE receives the signal, if the received PSCCH indicates information available for combining, the receiving UE may combine the received plurality of PSCCHs; otherwise the PSSCH and/or PSCCH of the respective time cell is not combinable.

Preferably, the receiving UE determines a single time unit resource Si according to the predefined pattern relation information when receiving the signal, and the PSSCH and/or PSCCH of the N time units belonging to Si are combinable, as shown in fig. 11. Preferably, the predefined pattern relation information may be configured by a V2X control node or a base station.

Preferably, if the receiving UE receives on a beam basis, the receiving UE needs to determine the location (or pattern) of each possible single time unit resource Si for determining the pace of the receiving beam scanning reception (Rx beam sweep).

Preferably, if the receiving UE receives based on a beam, the transmitting UE transmits based on a beam, and the receiving UE needs to determine a pattern that can be received by beam scanning when receiving a signal, for example, the receiving UE needs to determine a pattern of N ₂ transmissions transmitted by the transmitting UE in the same direction. In a practical system, the capability of each receiving UE to receive beams may be different, e.g., receiving UE ₁ supports 4 receive beams and receiving UE ₂ supports 2 receive beams. It is then necessary for the receiving UE ₁ to determine the pattern of the transmitting UE ₃ transmitting n=n ₂ =4 beams in the same transmit beam direction, and for the receiving UE ₂, It is only necessary to know the pattern when the transmitting UE ₃ transmits 2 beams in the same transmit beam direction. however, in the broadcast nature of transmission, the transmitting UE cannot be individually optimized for each receiving UE. Thus, N is determined according to a relatively robust assumption. Then, for the receiving UE ₂, it is possible to receive 2 transmissions in one receive beam direction, and combining may be performed. As shown in fig. 12, the transmitting UE ₃ has 2 transmit beams, and the transmitting UE ₃ repeats transmitting one packet n= 4*2 =8 times. the receiving UE may not know the time relationship of the first transmit beam and the second transmit beam of the transmitting UE ₃, but the receiving UE needs to know the pattern that the transmitting UE ₃ transmits in one transmit beam.

Or when receiving a signal, the receiving UE needs to determine a pattern of N ₂ transmissions sent by the sending UE in the same direction, and a set of patterns of length N ₂ for N ₁ transmissions by the sending UE. For example, as also shown in fig. 12, the transmitting UE ₃ has 2 transmit beams, the receiving UE ₁ has 4 receive beams, and the receiving UE ₂ has 2 receive beams. Then, assuming that the transmitting UE ₃ transmits a signal 8 times, the specific pattern of the 8 transmissions is that 4 transmissions in the same transmission direction are immediately adjacent time units, and the transmissions in each different transmission direction are spaced 8 apart, i.e., #0, #1, #2, #3 are transmission beams 1, #8, #9, #10, #11 are transmission beams 2. Then, the receiving UE ₁ and the UE ₂ may each employ different receive beams on #0, #1, #2, #3, and similarly #8, #9, #10, #11.

Preferably, the UE transmits a beam on which the PSCCH is based and a beam on which the pscsch scheduled by the PSCCH is transmitted, the directions satisfying a predefined relationship. For example, are co-directional.

Preferably, the UE receives one PSCCH on a beam basis and the direction of the received beam on which the PSCCH scheduled PSCCH is received is based, satisfies a predefined relationship. For example, are co-directional.

Preferably, the PSCCH may carry beam information of the scheduled PSCCH.

Embodiment four:

In actual V2X system operation, the system load may be relatively large, which may cause interference between UEs to become large, and reduce reliability of communication. To maintain system stability, congestion control needs to be introduced.

Preferably, when the UE has N transmission resource pools and/or resource groups, the UE determines transmission parameters in Np resource pools, for example, the number of sub-channels occupied in each resource pool, the adjustment of the coding adjustment Mode (MCS), the number of times (K) of one data transmission, the occupation period of resources, the transmission power parameter, and the like, according to the Channel Busy Ratio (CBR) of time units in the N transmission resource pools and/or resource groups, respectively.

Preferably, the UE calculates a resource occupancy ratio (CR) and/or a maximum value of CR (CRlimit) for the N transmission resource pools and/or the resource groups, respectively.

Preferably, the UE determines reserved resources for the N sending resource pools and/or resource groups, respectively, and reserves one or more resources according to a reservation interval, and assumes that the reserved resources are used for UE transmission.

Preferably, the UE determines, for the N sending resource pools and/or resource groups, whether to discard some reserved resources according to the measured value and the priority of the CBR, so as to meet the requirement of the CBR.

Fifth embodiment:

In the prior art, on one carrier of the V2X system, the subframes occupied by the V2X synchronization channel are removed, and some reserved subframes are removed so that the number of the remaining subframes in one System Frame Number (SFN) period is an integer multiple of the bit mapping length L _bitmap of the configuration resource pool, and the TDD (Time Division Duplexing, time division duplex) system also needs to remove all downlink subframes, and the remaining subframe set is recorded as Is the logical number of the remaining subframes.

In order to support more flexible system configurations, in some communication systems, such as 5G systems, a base station semi-statically configures uplink timeslots, downlink timeslots, and flexible timeslots. In flexible time slots, the base station may perform cellular downlink transmission, e.g., transmit PDCCH, transmit PDSCH, or other downlink signals. The base station may also schedule the UE for cellular uplink transmission. In such a system, in order to avoid interference between V2X communications and cellular communications, when configuring the resource pool for V2X communications, resources that may cause interference may be removed by at least one or a combination of:

(1) Removing the semi-static configured downlink time slot/downlink symbol;

(2) Removing the semi-static configured downlink time slot/downlink symbol and the flexible time slot/flexible symbol;

(3) Removing the semi-static configured downlink time slot/downlink symbol and the semi-static configured downlink or flexible time slot/symbol for PDCCH transmission;

(4) The semi-statically configured time slots/symbols for a particular downlink signal/channel transmission are removed. The specific downlink signal/channel is: downlink synchronization channels and/or PBCH and/or system information (e.g., SIB 1) and/or specific periodic reference signals, e.g., reference signals for RRM or RLM measurements;

(5) The semi-statically configured slots/symbols for a particular uplink signal/channel transmission are removed. The specific uplink signal/channel is: time slots/symbols for random access PRACH.

Based on the resource allocation method provided by the present invention, the present invention also provides a user equipment, as shown in fig. 13, including:

A first processing unit 1301, configured to perform sensing detection on each configured resource pool and/or each group of resources to obtain a detection result, where the detection result includes a set formed by the remaining single time unit resources of each resource pool;

A second processing unit 1302, configured to select a single time unit resource from the set consisting of the remaining single time unit resources of each resource pool and/or each group of resources as a transmission resource;

A sending unit 1303, configured to send a data packet to be transmitted, which is carried by the sending unit via the sending resource;

For all embodiments of the present invention, when the V2X traffic types that the UE needs to receive or transmit are different, the transmit beam and/or the receive beam may be different from one traffic type to another. For example, in a fleet (platooning) traffic scenario, the vehicles in the fleet may only need to transmit forward and/or backward, and then the UE may only need to employ transmit and/or receive beams forward and/or backward even though the UE has the capability to support multiple transmit beams. Naturally, in various embodiments of the present invention, determining a transmit resource pool, a receive resource pool, selecting a transmit resource by sensing detection, determining a transmit and/or receive beam direction, etc. may all be different from service to service.

Those skilled in the art will appreciate that the present application includes apparatuses related to performing one or more of the operations described herein. These devices may be specially designed and constructed for the required purposes, or may comprise known devices in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium or any type of medium suitable for storing electronic instructions and respectively coupled to a bus, including, but not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROMs (Read-Only memories), RAMs (Random AcceSS Memory, random access memories), EPROMs (EraSable Programmable Read-Only memories), EEPROMs (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only memories), flash memories, magnetic cards, or optical cards. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions can be implemented in a processor of a general purpose computer, special purpose computer, or other programmable data processing method, such that the blocks of the block diagrams and/or flowchart illustration are implemented by the processor of the computer or other programmable data processing method.

Those of skill in the art will appreciate that the various operations, methods, steps in the flow, acts, schemes, and alternatives discussed in the present invention may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed herein may be alternated, altered, rearranged, disassembled, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present invention may also be alternated, altered, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims

1. A method performed by a user equipment in a wireless communication system, comprising the steps of:

removing first time-frequency resources from a configured resource pool to obtain a resource set, wherein the resource set comprises at least one first resource;

Selecting a first resource from the set of resources;

transmitting a data packet to be transmitted on the selected first resource;

Wherein the first resource comprises N continuous time units and M physical resource blocks PRB, N is more than 1, and M is more than or equal to 1;

Wherein the excluding the first time-frequency resource from the configured resource pool includes:

Receiving a physical bypass control channel PSCCH sent by other UE in a perception detection window used for the resource pool, and determining time-frequency resources and priorities of a physical bypass shared channel PSSCH according to the PSCCH;

PSSCH-RSRP measurement is carried out on the PSSCH based on the time-frequency resource, and whether the RSRP measurement value of each PSSCH is higher than a predefined threshold is determined according to the priority of each PSSCH;

if the RSRP measured value of the PSSCH is higher than the predefined threshold and the corresponding first time-frequency resource is located in the resource selection window for the resource pool, excluding the first time-frequency resource;

wherein the first time-frequency resource includes the N continuous time units and M PRBs;

The time difference between the first time unit and the last time unit in the N time units does not exceed a preset time threshold;

the N time units adopt the same frequency domain resource.

2. The method as recited in claim 1, further comprising:

receiving configuration information about the resource pool from a base station;

and determining the resource pool based on the configuration information.

3. The method according to claim 1, wherein if a plurality of resource pools for transmission are configured, a UE having a transmission beam capability can transmit data with different transmission beams within the plurality of resource pools for transmission; within the same pool of resources used for transmission, data is transmitted using the same transmit beam.

4. The method according to claim 1, wherein if a plurality of resource pools for reception are configured, a UE having a capability of receiving a beam, within the plurality of resource pools for reception, data can be received with different reception beams; within the same pool of resources for reception, data is received with the same receive beam.

5. The method of claim 1, further comprising:

If the number of the remaining first resources except the first time-frequency resources in the resource pool is smaller than a threshold value, the predefined threshold value is increased, and the first time-frequency resources are re-removed until the number of the remaining first resources meets the threshold value.

6. The method of claim 1, wherein said selecting a first resource in said set of resources comprises:

calculating average received energy S-RSSI of the first resources remained in the resource pool;

Selecting a preset number of first resources according to the sequence from small to large of each S-RSSI value;

Selecting one first resource from the preset number of first resources.

7. The method according to any one of claims 1-6, further comprising:

Receiving the PSCCH and/or PSSCH in a receiving resource pool; wherein the PSCCH and/or PSSCH is carried on N time units comprised by the first resource.

8. The method according to any one of claims 1-6, further comprising:

Receiving PSCCH and/or PSSCH in each time unit in the N time units;

And acquiring the indication information of the time and/or frequency domain of the PSCCH and/or PSSCH of each other time unit carried in the PSCCH.

9. The method according to any of claims 1-6, characterized in that the data packets to be transmitted are sent and/or received on a beam basis.

10. The method of claim 9, wherein the step of determining the position of the substrate comprises,

A group of UEs, the beam directions transmitted in the corresponding resource pools for transmission follow the same rule; and/or the number of the groups of groups,

A group of UEs, the received beam directions in the corresponding resource pool for reception follow the same rule.

11. An apparatus comprising a memory and a processor;

The memory stores a computer program;

The processor for performing the method of any of claims 1 to 10 when the computer program is run.

12. A computer readable medium, characterized in that the medium has stored therein a computer program which, when run by a processor, performs the method of any of claims 1 to 10.