CN107277922A - Control channel and data channel sending method and equipment in a kind of V2X communications - Google Patents

Control channel and data channel sending method and equipment in a kind of V2X communications Download PDF

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Publication number
CN107277922A
CN107277922A CN201610643989.7A CN201610643989A CN107277922A CN 107277922 A CN107277922 A CN 107277922A CN 201610643989 A CN201610643989 A CN 201610643989A CN 107277922 A CN107277922 A CN 107277922A
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China
Prior art keywords
pscch
pssch
resource
resources
resource pool
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CN201610643989.7A
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CN107277922B (en
Inventor
张世昌
李迎阳
王轶
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Priority to CN202410665492.XA priority Critical patent/CN118510034A/en
Priority to PCT/KR2017/003641 priority patent/WO2017171519A1/en
Priority to US16/080,209 priority patent/US11290918B2/en
Publication of CN107277922A publication Critical patent/CN107277922A/en
Application granted granted Critical
Publication of CN107277922B publication Critical patent/CN107277922B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]

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

Abstract

Present applicant proposes control channel and data channel sending method in a kind of V2X communications, including：UE determines PSCCH and PSSCH resource pool configuration first, and above-mentioned incidence relation between the two, then UE in PSCCH resource pools or PSCCH resource pool subset in determine the one or many transmissions of PSCCH needed for PSCCH resources, and further in the PSSCH resource pools associated with PSCCH resource pools or with the subset of the PSSCH of the subset associations of PSCCH resource pools resource pool in determine send PSSCH time-frequency domain resources, last UE it is determined that PSCCH and PSSCH resources on send corresponding information.By the present processes, the requirement of V2X business low time delays is disclosure satisfy that, while UE implementation complexity can be controlled effectively.

Description

Method and equipment for transmitting control channel and data channel in V2X communication
Technical Field
The present application relates to the field of mobile communication technologies, and in particular, to a method and an apparatus for transmitting a control channel and a data channel in V2X communication.
Background
Currently, Device-to-Device (D2D) communication technology has been accepted by 3GPP standards by virtue of its great potential value In the public safety field and the general civil communication field, and realizes standardization of Partial functions In 3GPP Rel-12, including mutual discovery of D2D terminals In a cell Coverage scenario and broadcast communication between D2D terminals In a cell Coverage (IC) scenario, a Partial Coverage (PC) scenario and an Out of Coverage (OC) scenario.
The current 3GPP Rel-12 standard defines two modes of D2D broadcast communication, referred to as Mode 1(Mode 1) and Mode 2(Mode 2). Where Mode1 requires that the UE sending the D2D broadcast communication must be a UE (icue) located under the coverage of the cellular network. The method comprises the steps that UE (user equipment) acquires configuration information of a Resource pool of a bypass Control CHannel (PSCCH) of Mode1 by receiving a system broadcast signaling sent by eNB, wherein the configuration information comprises a period of the PSCCH, a subframe position used for sending the PSCCH in each period and a Physical Resource Block (PRB) position used for sending the PSCCH in each subframe, and when the UE supporting Mode1 broadcast communication has data, the UE applies for a special Mode1 communication Resource to the eNB through a specific Buffer Status Report (BSR); then, the UE detects the eNB's bypass scheduling (Sidelink Grant) before each PSCCH period, and obtains the resource location of the PSCCH and the bypass data CHannel (PSCCH) transmitted in the PSCCH period. In the Mode1, resource collision between different UEs can be avoided through centralized control of the eNB.
The UE sending D2D broadcast communication through Mode 2 may be an ICUE, or may be an out-of-coverage UE (ocee) of a cellular network. The ICUE acquires a PSCCH resource pool of Mode 2 and associated PSSCH resource pool configuration by receiving eNB system broadcast signaling, wherein the PSSCH resource pool comprises a subframe position used for PSSCH transmission in an associated PSCCH period and a physical resource block position used for PSSCH transmission in each subframe, and transmission resources of the PSCCH and the associated PSSCH are randomly selected in each PSCCH period; OCUE determines the PSCCH resource pool of Mode 2 and the configuration of the associated PSSCH resource pool through the pre-configuration information, and the resource selection Mode is the same as that of ICUE. In the PC scenario, the Mode 2 resource pool configuration preconfigured by the ocee is related to the carrier frequency, the system bandwidth and/or the TDD configuration of the cell in which the ICUE participating in D2D broadcast communication is located.
In the two D2D broadcast communication modes, the PSCCH resource pool and the PSCCH resource pool or the PSCCH resources are bound one by one, and in each PSCCH period, the PSCCH resource pool is located before the PSCCH resource pool or the PSCCH resource associated with the PSCCH resource pool or the PSCCH resource, and there is no overlap between the two resources. In addition, the D2D terminals all operate in half-duplex mode, which results in the simultaneous transmitting terminals not being able to receive the signals transmitted by the other party. In Rel-12, the half-duplex limitation is solved by means of resource hopping.
In each PSCCH period, each PSCCH is transmitted twice, and the first time-frequency domain resource is:
the resources for the second transmission are:
wherein s is a PSCCH resource index, a PSCCH resource refers to one or more PRBs for a PSCCH transmission, and N istNumber of sub-frames, N, contained in PSCCH resource poolfNumber of PRBs, N, contained for PSCCH resource pools＝Nt-1. By the resource hopping mode, the PSCCH transmitted on the same subframe for the first time, the offset generated by the subframe position of the resource transmitted for the second time, and the amplitude of the offset are related to the frequency domain position of the resource transmitted for the first time, so that the positions of the subframes retransmitted by the PSCCH transmitted on the same subframe for the first time are different. In addition, the reliability of PSCCH reception can be guaranteed by two transmissions.
For PSSCH scheduled by PSCCH, subframe positions of four transmissions are determined by a Time domain Resource Pattern (TRP), indexes of TRP adopted by PSSCH transmission are indicated by PSCCH, and a receiving terminal determines a mapping relation between the TRP indexes and the TRP through receiving cell signaling or pre-configuration. TRP is formed by length NTRPIndicates if the set of sub-frames used for PSSCH transmission in a PSCCH period is as followsAnd the TRP pattern related to the TRP index indicated in the PSCCH at this time isThen if it isThen subframe ljPSCCH transmission for PSCCH scheduling. Because of different TRP associationsThe positions of the sub-frames are not completely the same, so that terminals adopting different TRPs to transmit PSSCH have the opportunity to receive PSSCH of the other party. In addition, similar to the PSCCH, four transmissions ensure that the receiving end receives the bit error rate of the PSCCH.
As can be seen from the above description, because of the requirements for addressing half-duplex restrictions and ensuring reception reliability, the transmission resources of the PSCCH and the transmission resources of the PSCCH do not overlap, the transmission resources of the PSCCH precede the scheduled transmission resources of the PSCCH, and the resource hopping scheme used is also different from PSCCH transmission. Such a design is beneficial to simplify the receiving complexity of the receiving end, but also increases the PSSCH transmission delay.
Since the standardized D2D communication in 3GPP Rel-12 mainly aims at low-speed terminals and services with low requirements on delay sensitivity and reception reliability, the implemented D2D function is far from meeting the user requirements, and in the subsequent 3GPP versions, the functional framework for further enhancing D2D is a widespread consensus among various communication terminal manufacturers and communication network equipment manufacturers at present. Among them, based on the current D2D broadcast communication mechanism, it supports direct low-latency high-reliability communication between high-speed devices, between a high-speed device and a low-speed device, and between a high-speed device and a stationary device, that is, V2X (Vehicle to Vehicle/legacy/Infrastructure/Network), is one of the functions that require preferential standardization.
Compared with the existing D2D communication, the biggest difference of V2X communication lies in higher delay and reliability requirements, and 3GPP explicitly provides that the minimum delay requirement of V2X is 20ms and explicitly provides a requirement of high reliability, and these two requirements are not considered as main factors in the design process of the existing D2D. For example, in the existing D2D communication mechanism, the absolute time length occupied by the resource pool of the PSCCH may reach 400ms at most, and since the position of the data resource is always behind the PSCCH resource pool, the transmission delay of data in the existing D2D communication is difficult to guarantee; in addition, the number of times of sending the PSCCH is two at present, and for a plurality of terminals sending the PSCCH, if the terminals send the PSCCH for the first time or send the PSCCH for the second time in the same subframe, the probability that the terminals receive the PSCCH of the other side is at most once, which seriously affects the receiving reliability of the PSCCH; furthermore, since the PSCCH may currently schedule multiple PSCCH transmissions per PSCCH period, the reliability of PSCCH reception may be further reduced relative to the reliability of PSCCH reception.
Through the above analysis, it can be seen that the existing D2D communication mechanism has great defects in data transmission delay and data transmission reliability, and completely fails to meet the requirements of low delay and high reliability in V2X communication. However, there is no ideal technical solution to solve the above problems.
Disclosure of Invention
The present application aims to solve at least one of the above technical drawbacks, and in particular provides a method and apparatus for transmitting PSCCH and PSCCH in V2X communication, including:
the UE firstly determines a resource set which can be used for transmitting the PSCCH and a PSSCH resource set associated with the resource set;
the UE determines a PSCCH resource required by PSCCH transmission in a PSCCH resource set;
the UE determines the time-frequency domain resource for sending the PSSCH in a PSSCH resource set associated with the PSCCH resource set;
and the UE transmits corresponding information on the determined PSCCH and PSSCH resources.
Preferably, determining the set of PSCCH transmission resources and the set of PSCCH transmission resources associated therewith comprises: the resource set for transmitting the PSCCH is all the resources of the PSCCH resource pool, and the resource set for transmitting the PSSCH is all the resources of the PSSCH resource pool. Or,
the resource set for sending the PSCCH is a subset of a PSCCH resource pool, and the resource set for sending the PSSCH is the subset of the PSSCH resource pool; the PSCCH resource pool subset and the PSSCH resource pool subset comprise completely same subframes, and PRB positions are not overlapped.
Preferably, the UE determines the PSCCH resource set associated with the UE according to a plurality of PSCCH resource pools having a binding relationship with a current PSCCH resource pool, where the plurality of PSCCH resource pools having a binding relationship are associated with the same PSCCH resource pool, and a subframe set of the PSCCH resource pool is a union of subframe sets of the plurality of PSCCH resource pools associated with the PSCCH resource pool.
Preferably, the set of subframes of the resource pool is uniquely determined by a bitmap and an offset value, wherein the offset value represents an offset of the start of the set of subframes relative to the start of the V2X system frame.
Preferably, the bitmap of bits associated with the subframes available for V2X communication that are consecutive after the offset value, the first bit of the bitmap of bits associated with the beginning of the set of subframes should be repeated a number of times until it occupies one V2X system frame period, and if the length of the V2X system frame period is not an integer multiple of the length of the bitmap, the portion of the bitmap of bits that was repeated last beyond one V2X system frame period should be truncated.
Preferably, the UE may use two transmission methods:
the PSCCH and the scheduled PSSCH can be transmitted in the same subframe and are marked as a first transmission mode;
alternatively, the PSCCH is transmitted before the scheduled PSCCH, which is denoted as transmission mode two.
Preferably, if there is a bonding relationship between PSCCH resource pool C1 and another PSCCH resource pool C2, and C2 and its associated PSCCH resource pool S2 support transmission mode one, the set of subframes of PSCCH resource pool S1 associated with C1 may be the union of the set of subframes of C1 and the set of subframes of C2; also, the PRB set of S1 should be a superset of the PRB set of S2.
Preferably, the UE determines whether there are multiple available PSCCH resources in the current transmission period, and if so, the UE may randomly select a PSCCH resource from the multiple available PSCCH resources, or preferentially select a PSCCH resource with a closest time position from the multiple available PSCCH resources, or preferentially select a PSCCH resource with a lowest interference level from the multiple available PSCCH resources;
wherein, the set of resources for transmitting the PSCCH is all resources of a PSCCH resource pool, if the subframe n belongs to the PSCCH resource pool selected by the UE and the interval between the subframe n and the generation time of the data pre-transmitted by the UE is less than the maximum tolerated time delay of the data, the UE determines the PSCCH resource Sc of the subframe n as an available PSCCH resource when the PSCCH resource Sc of the subframe n meets one of the following conditions,
the UE sends PSCCH in PSCCH resources Sc of the subframe n-P;
the UE detects that the energy mean value of a PSCCH resource Sc on a subframe n-iP is smaller than a preset threshold, wherein i belongs to (0, a);
the service sent by the UE belongs to a specific priority;
where P is the transmission period of the UE and a is a specific value. Preferably, the resource set for transmitting the PSSCH is all the resources of the PSSCH resource pool;
if a set Sd composed of one or more PRBs in a PSSCH resource pool where the subframe m is located meets one of the following conditions, the UE regards Sd as an available PSCCH resource:
the UE sends PSSCH on resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; moreover, one or more PRBs within the set Sd are not occupied by other UEs transmitting data above a certain priority;
the UE has not sent the PSSCH on the resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; moreover, the UE detects that the energy mean value of the PSCCH resources Sd on the subframe m-lP is smaller than a preset threshold, wherein l belongs to (0, b);
the UE has not sent the PSSCH on the resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; moreover, when some or all PRBs in Sd are scheduled by PSCCHs transmitted by other UEs, the UE detects that a mean value of powers of one or more PSCCHs scheduling the PRBs is less than a booking threshold;
the UE detects that the energy mean value of PSSCH resources Sd on a subframe m-lP is smaller than a preset threshold, wherein l belongs to (0, b);
if the UE finds that the available PSSCH resources exist in a plurality of sub-frames in the current transmission period and the available PSCCH resources are enough to bear the data packets transmitted by the UE, the UE randomly selects the PSSCH resources from the available PSSCH resources or preferentially selects the PSSCH resources with the closest time position.
Wherein b is a specific value.
Preferably, if the data transmitted by the UE is higher than the predetermined priority, the time interval between the PSCCH time-frequency domain resource determined by the UE for transmitting the PSCCH and the PSCCH time-frequency domain resource for transmitting the PSCCH scheduled by the PSCCH should be greater than a predetermined value.
Preferably, the UE selecting PSCCH and PSCCH resources further comprises the UE selecting a transmission resource for PSCCH only among resources in the PSCCH resource pool other than the subset of the PSCCH resource pool if the power at which the UE currently transmits the PSCCH exceeds Pr _ max _ C.
Preferably, for transmission mode one and transmission mode two, the PSCCH is transmitted four times, and the subframe position where the four times are transmitted is determined according to the index value I in the TRP set defined in Rel-12/13TRP＝nPSCCH3_1Or nPSCCH3_2For any of the four subframes, the index of the PSCCH resource used to transmit the PSCCH is according to ITRPDetermining relative position in a set S, wherein the set S is N of TRP set taking current subframe as transmission subframeTRPA set of TRPs.
Preferably, the UE selecting the psch resource includes: if the current UE is in the first transmission mode, the PSSCH transmission times of the UE are the same as the PSCCH transmission times, and the PSSCH and the PSCCH for scheduling the PSSCH are transmitted in the same subframe.
Preferably, the PSCCH and PSCCH transmission modes include: for the first transmission mode, the PRB position for sending the PSSCH may be indicated by the eNB configuration signaling or the pre-configuration information;
for the second transmission mode, the information carried by the PSCCH at least comprisesThe bits are used to indicate the subframe position of each scheduled PSSCH transmission, and the PRB position occupied within each subframe, where T denotes the number of PSSCH transmissions, NPRBIndicating the number of PRBs per subframe within the psch resource pool.
Preferably, the PSCCH and PSCCH transmission modes further include: if the UE currently adopts the first transmission mode, the UE should adopt the first PSCCH format, and if the UE currently adopts the second transmission mode, the UE should adopt the second PSCCH format.
Preferably, the difference between the PSCCH format one and the PSCCH format two includes: the bit number contained in the PSCCH format one is the same as that of the PSCCH format two, and the UE adopting the transmission mode one needs to set the specific domain in the PSCCH to be a fixed value.
Preferably, the UE setting the PSCCH content includes:
and the UE adopting the first transmission mode sets the bit field used for the PSSCH to transmit the sub-frame position indication at each time in the PSCCH to be 0 or 1. And the UE adopting the first transmission mode sets all bit fields used for PSSCH time-frequency resource indication in the PSCCH to be 0 or 1.
Preferably, if the PRB index i of the PSCCH is transmittedSAN for scheduled PSSCH transmission less than the index of all PRBs in the PSSCH resource pool PRB set with which it is associatedPSSCHEach PRB index is iSA+1，iSA+2,…,iSA+NPSSCH(ii) a If PRB index i of PSCCH is transmittedSAGreater than the index of all PRBs in the PSSCH resource pool PRB set with which it is associated, N for scheduled PSSCH transmissionPSSCHEach PRB index is iSA-1，iSA-2,…,iSA-NPSSCH。
According to the technical scheme provided by the application, the UE firstly determines the resource pool configuration of the PSCCH and the PSSCH and the incidence relation between the PSCCH and the PSSCH, then the UE determines the PSCCH resources required by one-time or multiple-time transmission of the PSCCH in the PSCCH resource pool or the subset of the PSCCH resource pool, further determines the time-frequency domain resources for transmitting the PSSCH in the PSSCH resource pool associated with the PSCCH resource pool or the subset of the PSSCH resource pool associated with the subset of the PSCCH resource pool, and finally the UE transmits corresponding information on the determined PSCCH and PSSCH resources. By the method, the requirement of low time delay of the V2X service can be met, and the complexity of the UE can be effectively controlled.
Drawings
FIG. 1 is a flow chart of the operation of a sending UE of the present application;
fig. 2 is a schematic diagram of PSCCH and PSCCH resource subset configurations of the present application;
fig. 3 is a schematic diagram illustrating a correspondence relationship between a PSCCH resource pool and a PSCCH resource pool according to the present application;
FIG. 4 is a schematic diagram of a configuration method of a subframe set according to the present application;
fig. 5 is a schematic diagram illustrating a corresponding relationship between one psch resource pool and two psch resource pools according to the present application;
fig. 6 is a schematic diagram of relative positions of a PSCCH resource pool and a PRB set of a PSCCH resource pool associated with the PSCCH resource pool supporting a first transmission mode in the present application;
fig. 7 is a schematic diagram of the structure of a preferred apparatus of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
In V2X communication, compared with the current D2D communication, there are higher requirements for data transmission delay and data transmission reliability, and the current D2D communication mechanism has disadvantages in the resource allocation and hopping of PSCCH and PSCCH, and cannot meet the requirements for low delay and high reliability of V2X communication in many cases. To this end, the present application proposes a PSCCH resource allocation method, for a transmitting UE, as shown in fig. 1, the PSCCH and PSCCH channels are transmitted according to the following steps:
step 110: the UE determines the resource pools of PSCCH and PSCCH.
In this application, the UE may determine the configuration of the two resource pools by receiving signaling of the eNB or by pre-configuration. From the perspective of the whole system, the PSCCH resource pool and the PSCCH resource pool occupy the same subframe, and the PRB positions occupied by the PSCCH resource pool and the PSCCH resource pool are not completely the same in the same subframe.
Step 120: the UE determines the PSCCH resources required for one or more transmissions of the PSCCH within the PSCCH resource pool or a subset of the PSCCH resource pool.
In the application, a PSCCH resource refers to the number of PRBs used for one PSCCH transmission, and the same PSCCH may be transmitted one or more times, and if the number of the PRBs is multiple times, the resources occupied by multiple PSCCH transmissions are completely independent, or the resources occupied by multiple PSCCH transmissions are determined by a certain predefined or preconfigured resource pattern, and each resource pattern is associated with a unique index value.
The UE determines a subset of the resource pool, which may be associated with one or more PSCCH resources, or with one or more PSCCH patterns, by receiving eNB signaling or by pre-configuration.
In this application, the PSCCH and the scheduled PSCCH may be transmitted within the same subframe, or the PSCCH may always be transmitted before the scheduled PSCCH, the former being referred to as transmission mode one and the latter being referred to as transmission mode two in this application.
Under the condition of configuring or pre-configuring the PSCCH resource pool subset, the UE may determine a transmission mode and select a location of the PSCCH resource according to the traffic type, for example, if the data sent by the UE belongs to the first traffic type, the UE adopts the first transmission mode, and the UE selects the PSCCH resource in the PSCCH resource pool subset, and if the data sent by the UE belongs to the second traffic type, the UE adopts the second transmission mode, and the PSCCH resource is selected in the PSCCH resource pool. The first and second traffic types are defined by a standard. Specifically, the implementation is realized in the UE, the service type can be judged by the service layer of the UE, and a corresponding indication is given to the UE access layer, and the UE access layer selects the PSCCH resources in a corresponding set (in a PSCCH resource pool or a subset of the PSCCH resource pool) according to the indication (service type one or service type two) of the service layer.
In addition, in the present application, the UE may always transmit the PSCCH and PSCCH in transmission-one or always in transmission-two.
Step 130: the UE determines the time-frequency domain resource on which to transmit the PSCCH within a PSCCH resource pool associated with the PSCCH resource pool or within a subset of the resource pool of the PSCCH associated with a subset of the PSCCH resource pool.
The PSSCH resource pool associated with the PSCCH resource pool is the PSSCH resource pool in the PSCCH period or the PSSCH resource pool in the next PSCCH period. The PSCCH resource pool subset comprises exactly the same sub-frames as the associated PSCCH resource pool subset.
In the application, the same PSSCH may be transmitted one or more times, and if the PSSCH is transmitted multiple times, resources occupied by multiple PSSCH transmission are completely independent, or the resources occupied by multiple PSSCH transmission are determined by a certain predefined or preconfigured time domain resource pattern and frequency hopping pattern, and each time domain resource pattern is associated with a unique index value.
The UE determines the subset of the psch resource pool by receiving eNB signaling or by pre-configuration.
Step 140: the UE sends the PSCCH and the PSSCH on the determined resources;
in the application, the PSCCH sent by the UE should at least include a time-frequency resource indication of the PSCCH, and the PSCCH should include a transmission mode (a first transmission mode or a second transmission mode) that can indicate the PSCCH association under the condition that the PSCCH and PSCCH resource pool subsets are configured or preconfigured.
It should be specifically noted that the present application does not limit the execution sequence of the above steps.
In order to facilitate understanding of the present application, the following further explains the above technical solution of the present application in an inter-device interaction mode by combining specific application cases as follows:
the first embodiment is as follows:
in this embodiment, the UE determines the PSCCH and PSCCH resource pools by receiving eNB signaling or by pre-configuration, and in all cases, the UE always transmits the PSCCH and PSCCH according to a transmission mode. And the specific implementation steps are as follows:
step 210: the UE determines the PSCCH resource pool and the PSCCH resource pool associated therewith.
In this embodiment, the subframe positions of the PSCCH and PSCCH resource pools may be indicated by the same bitmap, and the PRB positions of the PSCCH and PSCCH resource pools do not overlap on each subframe. The PSCCH resource pool is associated with a PSCCH resource pool at the same subframe location.
Step 220: the UE determines the PSCCH resources required by multiple times of PSCCH transmission in the PSCCH resource pool.
In this embodiment, the number of transmissions of each PSCCH may be two or four, and the PSCCH resources on which the PSCCH transmissions are performed may be completely independent from each other or may be determined by a predefined resource pattern.
The UE autonomously selects a PSCCH resource for multiple PSCCH transmissions within a PSCCH resource pool (if there is complete independence between PSCCH resources over which multiple PSCCH transmissions are sent) or selects a resource pattern index n associated with a PSCCH resource for multiple PSCCH transmissionsPSCCH1. The UE can perform autonomous selection according to one or more of the methods of the resource detection result, the position of the UE, a random resource selection mechanism and the like, and the method for autonomously selecting the PSCCH resources by the UE is not limited in the application and the same as the following steps.
If the PSSCH is transmitted twice, the mode that the UE determines the positions of PSCCH resources for the first transmission and the second transmission of the PSCCH through the resource pattern index is the same as the PSCCH transmission resource determination mode defined in Rel-12/13.
If the PSCCH is transmitted four times, the subframe positions of the four transmissions are determined according to the index value I in the TRP set defined in Rel-12/13TRP＝nPSCCH1For any of the four subframes, the index of the PSCCH resource used to transmit the PSCCH is determined according to:
1. determining N in the TRP set by taking the current subframe as a transmission subframeTRPA set S of TRPs;
2. determining I by arranging TRPs in the set S according to the ascending or descending order of indexes of TRPsTRPRelative order within the set S
3. Determining a PSCCH resource index n for transmitting a PSCCHTRPComprises the following steps:
where Ns is a standard definition or a determination of the configuration of the central control node, Ns may be NTRP/4；fhop(i) Determining the frequency-hopping factor, f, for a standard definition or configuration of a central control nodehop(i) Can be as follows:
wherein c (k) is a standard defined pseudo-random sequence.
Step 230: the UE determines the time-frequency domain resource on which to transmit the PSCCH within a PSCCH resource pool associated with the PSCCH resource pool.
The PSSCH transmission frequency of the UE is the same as the PSCCH transmission frequency, and the ith PSSCH and the ith PSCCH are located in the same subframe.
If the number of PSSCH transmissions is two, the starting PRB position a1 at which the PSSCH is transmitted for the first time is autonomously selected by the UE in the first associated PSCCH transmission subframe, and the starting PRB position a2 at which the PSSCH is transmitted for the second time can still be autonomously selected by the UE in the second associated PSCCH transmission subframe, or determined by the following formula:
wherein M isPSSCHIndicating the number of PRBs contained in the PSSCH resource pool in each subframe.
If the PSSCH is transmitted for four times, the starting PRB position b1 where the PSSCH is transmitted for the first time is obtained through eNB configuration signaling or pre-configuration signaling; the starting PRB position where the psch is transmitted three subsequent times may also be selected autonomously by the UE in the corresponding subframe, or determined by the following formula:
wherein i is more than or equal to 2 and less than or equal to 4.
Step 240: the UE transmits the PSCCH and PSCCH on the resources determined in steps 220 and 230;
the information carried by the PSCCH at least comprises the starting PRB position and the number of PRBs where the PSSCH is transmitted at this time, and in addition, if the multiple transmission resources of the PSCCH are completely independent, the information carried by the PSCCH comprises the indication information which is currently transmitted for the second time of the PSCCH.
This embodiment ends by this. By the method of the embodiment, the PSCCH and the scheduled PSSCH can be transmitted in the same subframe, and the receiving UE can decode the PSCCH and the PSSCH simultaneously in one subframe under an ideal condition, which is beneficial to reducing the transmission delay of data. However, in case of receiving PSCCH reception depending on a plurality of times and then decoding PSCCH by soft combining to guarantee reliability, a receiving UE needs to buffer soft bit information of all PSCCHs within a corresponding subframe before successfully decoding PSCCH, thereby causing an increase in implementation complexity and cost of the UE.
Example two:
in this embodiment, the UE determines the PSCCH and PSCCH resource pools by receiving eNB signaling or by pre-configuration, and in all cases, the UE always transmits PSCCH and PSCCH according to transmission mode two. And the specific implementation steps are as follows:
step 310: the UE determines the PSCCH resource pool and the PSCCH resource pool associated therewith.
In this embodiment, the subframe positions of the PSCCH and PSCCH resource pools may be indicated by the same bitmap, and the PRB positions of the PSCCH and PSCCH resource pools do not overlap on each subframe. In the time domain, the nth PSCCH resource pool is associated with the (n + 1) th PSCCH resource pool.
Preferably, the time length of the PSCCH and PSCCH resource pools should be less than 50 ms.
Step 320: the UE determines the PSCCH resources required by multiple times of PSCCH transmission in the PSCCH resource pool.
In this embodiment, the number of transmissions of each PSCCH may be two or four, and the PSCCH resources on which the PSCCH transmissions are performed may be completely independent from each other or may be determined by a predefined resource pattern.
UE autonomously selects a PSCCH resource for multiple PSCCH transmissions or selects a resource pattern index n associated with the PSCCH resource for multiple PSCCH transmissions in a PSCCH resource poolPSCCH2。
If the PSSCH is transmitted twice, the mode that the UE determines the positions of PSCCH resources for the first transmission and the second transmission of the PSCCH through the resource pattern index is the same as the PSCCH transmission resource determination mode defined in Rel-12/13.
If the PSCCH is transmitted four times, the subframe positions of the four transmissions are determined according to the index value I in the TRP set defined in Rel-12/13TRP＝nPSCCH2For any of the four subframes, the index of the PSCCH resource used to transmit the PSCCH is determined in the same manner as in step 220.
Step 330: the UE determines the time-frequency domain resource on which to transmit the PSCCH within a PSCCH resource pool associated with the PSCCH resource pool.
In this embodiment, the UE autonomously selects a time-frequency domain resource for psch transmission in an associated psch resource pool.
Step 340: the UE transmits the PSCCH and PSCCH on the resources determined in steps 220 and 230;
the information carried by the PSCCH at least includes the subframe position of each transmission of the scheduled PSCCH and the PRB position occupied in each subframe, and the bit number occupied by the two indications is:bit, wherein NPRBT is equal to 2 or 4, which indicates the number of PRBs included in the current V2X communication bandwidth, and indicates the total number of transmission of the pschs.
This embodiment ends by this. By the method of the embodiment, the PSCCH is always sent earlier than the scheduled PSSCH, the receiving UE can receive the PSSCH according to the scheduling information indicated by the PSCCH after decoding the PSCCH, the UE does not need to buffer all soft bits of the PSSCH, and the realization complexity of the UE is favorably reduced. However, the transmission delay of data is large in this method.
Example three:
in this embodiment, the UE determines the PSCCH and PSCCH resource pools, and the subsets within the PSCCH and/or PSCCH resource pools, either by receiving eNB signaling or by pre-configuration. And the UE determines the transmission resource of the PSCCH in the PSCCH resource pool or the subset of the PSCCH resource pool according to the service type. And the specific implementation steps are as follows:
step 410: the UE determines a PSCCH resource pool and its associated PSCCH resource pool, and a subset of the PSCCH resource pool and its associated PSCCH resource pool subset.
In this embodiment, the subframe positions of the PSCCH and PSCCH resource pools may be indicated by the same bitmap, and the PRB positions of the PSCCH and PSCCH resource pools do not overlap on each subframe. In time domain, the PSCCH resource pool indicated by the current bitmap is associated with the PSSCH associated resource pool indicated by the next bitmap.
In this embodiment, the subset of the PSCCH resource pool comprises one or more PSCCH patterns, wherein a PSCCH pattern is defined by a standard. The PSCCH resource pool subsets associated with PSCCH resource pool subsets contain exactly the same subframes, and the PRB locations do not overlap, as shown in fig. 2.
The PSCCH resource pool subset may be associated with an eNB configured or preconfigured parameter Pr _ max _ C, and the UE determines that resources within the PSCCH resource pool subset can be selected according to the eNB configured or preconfigured parameter Pr _ max _ C and the current transmit power. The psch resource pool subset may be associated with an eNB configured or preconfigured parameter Pr _ max _ S, and the UE determines that resources within the psch resource pool subset can be selected based on the eNB configured or preconfigured parameter Pr _ max _ S and the current transmit power. .
Step 420: the UE determines the PSCCH resources required for one or more transmissions of the PSCCH within the PSCCH resource pool or a subset of the PSCCH resource pool.
If the data sent by the UE belongs to the traffic type one, the UE adopts the transmission mode one (namely the PSCCH and the scheduled PSSCH are sent in the same subframe), and the UE selects the PSCCH sending resource in the PSCCH resource pool subset. If the PSCCH resource pool subset contains only one PSCCH resource pattern, the UE selects the resource associated with that pattern as a PSCCH transmission resource. If the PSCCH resource pool subset contains a plurality of PSCCH resource pool patterns, the UE can randomly select one PSCCH resource pattern from the PSCCH resource pool subset, and the index of the resource pattern is nPSCCH3_1。
If the data sent by the UE belongs to the service type two, the UE adopts a transmission mode two (and the PSCCH is always sent before the scheduled PSSCH), and if the power of the PSCCH currently sent by the UE does not exceed Pr _ max _ C, the UE can select the PSCCH resource in the PSCCH resource pool; if the power of the current transmission of the PSCCH by the UE exceeds Pr _ max _ C, the UE can only select transmission resources of the PSCCH among the PSCCH resource pool, except for the PSCCH resource pool subset resources, in the PSCCH resource pool. The UE may determine the transmission power of the PSCCH through an open-loop power control parameter configured by the eNB or its own absolute speed, and the like. The UE can select the index n of the PSCCH transmission resource associated resource pattern according to one or more of the idle resource detection result, the self position and the random resource selectionPSCCH3_2。
In the present application, the PSCCH may be transmitted twice, and at this time, the method for determining the positions of PSCCH first transmission and PSCCH second transmission resources by the UE through the resource pattern index is the same as the PSCCH transmission resource determination method defined in Rel-12/13.
In addition, the PSCCH in the present application may be transmitted four times, and in this case, the subframe positions of the four transmissions are according to the index value I in the TRP set defined in Rel-12/13TRP＝nPSCCH3_1Or nPSCCH3_2For any of the four subframes described aboveIndex of PSCCH resource for transmitting PSCCH according to ITRPDetermining relative position in a set S, wherein the set S is N of TRP set taking current subframe as transmission subframeTRPA set of TRPs.
The specific UE is determined in the following manner:
1. determining N in the TRP set by taking the current subframe as a transmission subframeTRPA set S of TRPs;
2. determining I by arranging TRPs in the set S according to the ascending or descending order of indexes of TRPsTRPRelative order within the set S
3. Based onDetermining a PSCCH resource index n for transmitting the PSCCH according to a determined frequency hopping factor defined by a standard or configured by a central control nodeTRPComprises the following steps:
where Ns is a standard definition or a determination of the configuration of the central control node, Ns may be NTRP/4；fhop(i) Determining the frequency-hopping factor, f, for a standard definition or configuration of a central control nodehop(i) Can be as follows:
wherein c (k) is a standard defined pseudo-random sequence.
Step 430: the UE determines the time-frequency domain resource on which to transmit the PSCCH within a PSCCH resource pool associated with the PSCCH resource pool or within a subset of the resource pool of the PSCCH associated with a subset of the PSCCH resource pool.
If the current UE is in the first transmission mode, the PSSCH transmission times of the UE are the same as the PSCCH transmission times, and the PSSCH and the PSCCH which schedules the PSSCH are transmitted in the same subframe.
If the PSSCH is transmitted twice, the initial PRB position a1 where the PSSCH is transmitted for the first time is obtained through eNB configuration signaling or pre-configuration signaling; the starting PRB position a2 where the psch is transmitted for the second time is determined by the following equation:
wherein M isPSSCHIndicating the number of PRBs contained in the PSSCH resource pool in each subframe.
If the PSSCH is transmitted for four times, the initial PRB position a1 where the PSSCH is transmitted for the first time is obtained through eNB configuration signaling or pre-configuration signaling; the starting PRB position where the psch is transmitted three subsequent times is determined by the following equation:
wherein i is more than or equal to 2 and less than or equal to 4.
If the current UE is in the second transmission mode, the UE autonomously selects PSSCH resources in a PSSCH resource pool associated with the PSCCH resource pool, and the UE can select the PSSCH resources according to one or more of the resource detection result, the position of the UE, a random resource selection mechanism and the like.
Step 440: the UE sends the PSCCH and the PSSCH on the determined resources;
in this embodiment, for the first transmission mode, the PRB location for transmitting the psch may be indicated by eNB configuration signaling or pre-configuration information.
If the UE currently adopts the first transmission mode, the UE should adopt the first PSCCH format, and if the UE currently adopts the second transmission mode, the UE should adopt the second PSCCH format.
The information that should be included in PSCCH format two is the same as in step 340 in embodiment two.
According to an implementation manner of the present application, the number of bits included in the PSCCH format one may be the same as that of the PSCCH format two, and at this time, the UE using the transmission mode one needs to set a specific field in the PSCCH to a fixed value, for example, set bit fields used for position indication of subframes transmitted by the PSCCH each time to 0 or 1, or, if the PRB position of the PSCCH may be indicated by eNB configuration signaling or pre-configuration information, set all bit fields used for PSSCH time-frequency resource indication in the PSCCH to 0 or 1.
Alternatively, the PSCCH format one may include a different number of bits than the PSCCH format two, e.g., the PRB locations of the PSCCH may be indicated by eNB configuration signaling or pre-configuration information, and in this case, the PSCCH may not include a bit field indicating the PRB locations for PSCCH transmission.
This embodiment ends by this. The present embodiment has the advantages of both the first embodiment and the second embodiment, and data transmission can be performed through the first transmission mode for the service with higher delay requirement, because the probability of the service generation is smaller in the actual V2X communication environment, the implementation complexity of the receiving UE will not be increased significantly. For the service with lower time delay requirement, data transmission can be carried out through the second transmission mode.
Example four:
in this embodiment, the UE determines the PSCCH and PSCCH resource pools by receiving eNB signaling or by pre-configuration. Each PSCCH resource pool is associated with a unique one of the PSCCH resource pools, and one PSCCH resource pool may be associated with one or more PSCCH resource pools. And the UE selects the PSSCH resource in the corresponding PSCCH resource pool according to one or more of the information of the sending period, the channel detection result, the priority of the transmission service and the like, and selects the PSSCH resource in the PSSCH resource pool associated with the PSCCH resource pool according to the channel detection result. The specific implementation steps are as follows:
step 510: the UE determines the PSCCH resource pool and the PSCCH resource pool associated therewith.
According to one implementation of the present application (resource pool association), any PSCCH resource pool is uniquely associated with a PSCCH resource pool, and vice versa. The subframe locations of the PSCCH and PSCCH resource pools may be indicated by the same bitmap, with the PRB locations of the PSCCH and PSCCH resource pools not overlapping on each subframe, as shown in fig. 3.
Preferably, the subframe set may be uniquely determined by a bitmap and an offset value, wherein the offset value represents an offset of a starting point of the subframe set with respect to a starting point of the V2X system frame, the UE determines a starting position of the V2X system frame through the synchronization source, the bitmap is associated with subframes available for V2X communication which are consecutive after the offset value, a first bit (or a lowest bit) of the bitmap is associated with the starting point of the subframe set, the bitmap should be repeated a plurality of times until occupying one V2X system frame period, and if a length of the V2X system frame period is not an integer multiple of a bitmap length, a portion of the last repeated bitmap exceeding one V2X system frame period should be truncated as shown in fig. 4.
According to another implementation method (resource pool association mode two) of the present application, a plurality of PSCCH resource pools have a binding relationship therebetween, the plurality of PSCCH resource pools having the binding relationship are associated with the same PSCCH resource pool, and the number of PSCCH resource pools having the binding relationship may be 2 or greater than 2. For each PSCCH resource pool, its set of subframes may be configured by the method described above. In this case, the set of subframes of the PSCCH resource pool is the union of the sets of subframes of the PSCCH resource pools with which it is associated, as shown in fig. 5.
Step 520: the UE determines PSCCH resources required for one or more transmissions of the PSCCH within a corresponding PSCCH resource pool.
For the first resource pool association method, the UE directly selects the PSCCH resource pool determined in step 510. For the second resource pool association mode, the UE selects the corresponding PSCCH resource pool according to the priority of the service to be transmitted, for example, if the pre-transmitted service is higher than a certain specific priority, the PSCCH resource pool a is selected, otherwise, the PSCCH resource pool B is selected, wherein the UE may determine the correspondence between the service priority and the PSCCH resource pool through standard definition or eNB configuration.
In the selected PSCCH resource pool, the UE takes P as a transmission period and occupies the same PSCCH resources in a semi-static manner.
Preferably, if the subframe n belongs to the PSCCH resource pool selected by the UE and the interval between the subframe n and the generation time of the data pre-transmitted by the UE is less than the maximum tolerated delay of the data, the UE regards the PSCCH resource Sc of the subframe n as an available PSCCH resource when one of the conditions below the PSCCH resource Sc of the subframe n,
the UE sends PSCCH in PSCCH resources Sc of the subframe n-P; or,
the UE detects that the mean of the energies of the PSCCH resources Sc over the subframe n-iP is below a certain threshold, where i e (0, a ], the value of a is defined by the standard, e.g. a-2, or,
the traffic sent by the UE belongs to a certain priority, which is defined by the standard. For example, if the traffic transmitted by the UE belongs to the highest priority, the UE may select any PSCCH resource.
Preferably, if the service priority corresponding to the PSCCH resource pool to which the subframe n belongs is higher than the service priority pre-transmitted by the UE, and the interval between the subframe n and the generation time of the data pre-transmitted by the UE is less than the maximum tolerated delay of the data, the UE regards the PSCCH resource Sc of the subframe n as an available PSCCH resource when the PSCCH resource Sc of the subframe n satisfies the following condition:
the UE detects that the energy mean of the PSCCH resource Sc on subframe n-iP is smaller than a certain threshold, where i ∈ (0, a ], and the value of a is defined by a standard, for example, a ═ 2, and the UE transmission power is smaller than a threshold defined by a certain standard.
Preferably, if the service priority corresponding to the PSCCH resource pool to which the subframe n belongs is lower than the service priority pre-transmitted by the UE, and the interval between the subframe n and the data pre-transmitted by the UE is less than the maximum tolerated delay of the data, the UE may regard all PSCCH resources Sc of the subframe n as available PSCCH resources.
If the UE finds multiple available PSCCH resources in the current transmission period, the UE may randomly select a PSCCH resource from the PSCCH resources, or preferentially select a PSCCH resource with the closest time position, or preferentially select a PSCCH resource with the lowest interference level.
Preferably, the length of the transmission period is an integer multiple of the length of the bitmap used for resource pool subframe set configuration in step 510.
Step 530: the UE determines the time-frequency domain resource on which to transmit the PSCCH within a PSCCH resource pool associated with the PSCCH resource pool.
In this embodiment, the UE semi-statically occupies the same pscch resource with P as a transmission period. Preferably, if a set Sd of one or more PRBs in the PSCCH resource pool in which the subframe m is located satisfies one of the following conditions, the UE regards Sd as an available PSCCH resource:
the UE sends PSSCH on resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data;
or:
the UE has not sent the PSSCH on the resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; furthermore, the UE detects that the energy mean of PSCCH resources Sd on subframe m-lP is smaller than a certain threshold, where l ∈ (0, b ], and the value of b is defined by a standard, e.g., b ═ 2;
or:
the UE has not sent the PSSCH on the resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; moreover, when some or all PRBs in Sd are scheduled by PSCCHs transmitted by other UEs, the UE detects that a power average of one or more PSCCHs scheduling the PRBs is less than a certain threshold;
or:
the UE detects that the energy mean of the psch resource Sd over the subframe m-lP is below a certain threshold, where the value of l ∈ (0, b ], b is defined by the standard, e.g., b ═ 2.
If the UE finds that the available PSSCH resources exist in a plurality of sub-frames in the current transmission period and the available PSCCH resources are enough to bear the data packets transmitted by the UE, the UE randomly selects the PSSCH resources from the available PSSCH resources or preferentially selects the PSSCH resources with the closest time position.
In addition, if the UE transmits data above the priority defined by a certain standard, in order to provide sufficient time for the UE transmitting low priority traffic to decode the PSCCH transmitted by the UE, the time interval between the PSCCH transmitted by the UE and the scheduled PSCCH should be greater than a certain value defined by a certain standard, for example greater than 2.
Step 540: the UE sends the PSCCH and the PSSCH on the determined resources;
one or more of the following information fields should be included in the PSCCH:
1. a subframe position of the scheduled PSSCH;
2. the PRB position occupied by the scheduled PSSCH;
3. a modulation coding mode of the scheduled PSSCH;
4. sending the ID of the UE;
5. transmitting an index of the TB;
6. the number of transmissions of the current TB;
7, priority of bearing service in PSSCH;
the subframe position of the scheduled PSSCH can be in the same subframe or different subframes as the PSCCH, if the subframe position is the former subframe, the transmission mode is the first transmission mode, and otherwise, the transmission mode is the second transmission mode. The index of the transmission TB is used to distinguish different transmission TBs, and the number of transmissions of the current TB is used to indicate that the psch scheduled this time is the number of transmissions of the current TB.
This embodiment ends by this. In this embodiment, the services with different priorities may share the same PSCCH resource pool to avoid waste of PSCCH resources, or the service with high priority occupies a separate PSCCH resource pool to avoid the influence of the service with low priority on the service with high priority. And the services with different priorities share the same PSSCH resource pool, the UE sending the high-priority service indicates the occupied PSSCH position through the PSSCH, and the UE sending the low-priority service should avoid selecting the PSSCH resource scheduled by the PSSCH after detecting the PSSCH. The method can avoid the resource waste in the PSCCH resource pool and the PSSCH resource pool, and can protect the transmission of high-priority services.
Example five:
in this embodiment, the PSCCH and the scheduled PSCCH may be transmitted in the same subframe, and at this time, the frequency domain resources of the PSCCH and the scheduled PSCCH must be continuous, which is referred to as a first transmission mode. The PSCCH and the scheduled PSCCH may also be transmitted in different subframes, which is referred to as transmission mode two. The UE determines PSCCH and PSSCH resource pools by receiving eNB signaling or pre-configuration, each PSCCH resource pool is associated with a unique PSSCH resource pool, and the UE needs to further determine the transmission modes supported by the current PSCCH resource pool and the PSSCH resource pool associated with the current PSCCH resource pool. And one PSCCH resource pool may be associated with one or more PSCCH resource pools. And the UE selects the PSSCH resource in the corresponding PSCCH resource pool according to one or more of the information of the sending period, the channel detection result, the priority of the transmission service and the like, and selects the PSSCH resource in the PSSCH resource pool associated with the PSCCH resource pool according to the channel detection result. The specific implementation steps are as follows:
step 610: the UE determines the PSCCH resource pool and the PSCCH resource pool associated therewith.
In this embodiment, a plurality of PSCCH resource pools have a binding relationship therebetween, the plurality of PSCCH resource pools having the binding relationship are associated with the same PSCCH resource pool, and the number of PSCCH resource pools having the binding relationship may be 2 or greater than 2. For each PSCCH resource pool and the PSCCH resource pool associated therewith, if the first transmission mode is supported, the PSCCH resource pool and the PSCCH resource pool associated therewith have the same subframe set, and may be configured by the subframe set configuration method of the first resource pool association mode in the fourth embodiment. The PRBs included in the PRB sets of the two resource pools are consecutive in the frequency domain, and the union of the two PRB sets may include two consecutive PRBs, where each N with the highest index value and the lowest index valueSA(i.e. N at both endsSA) PRBs belong to the PSCCH resource pool, where NSANumber of PRBs for one SA Transmission defined for Standard, e.g. NSA2 as shown in fig. 6.
If there is a bonding relationship between PSCCH resource pool C1 and another PSCCH resource pool C2 and C2 and its associated PSCCH resource pool S2 support transmission mode one, the set of subframes of PSCCH resource pool S1 associated with C1 may be the union of the set of subframes of C1 and the set of subframes of C2. Also, the PRB set of S1 should be a superset of the PRB set of S2.
Step 620: the UE determines PSCCH resources required for one or more transmissions of the PSCCH within a corresponding PSCCH resource pool.
In this embodiment, the UE may select the PSCCH resource from the PSCCH resource pool randomly according to the channel detection result, or the position of the selected PSCCH resource (step 630 should be performed first).
Step 630: the UE determines the time-frequency domain resource on which to transmit the PSCCH within a PSCCH resource pool associated with the PSCCH resource pool.
In this embodiment, the method for selecting the PSSCH resource by the UE is the same as step 530 in the fourth embodiment.
Step 640: the UE sends the PSCCH and the PSSCH on the determined resources;
if the current PSCCH and the PSCCH associated therewith support transmission mode one, the PSCCH should include one or more of the following information fields:
1. number N of PRBs occupied by scheduled PSSCHPSSCH；
2. A modulation coding mode of the scheduled PSSCH;
3. sending the ID of the UE;
4. transmitting an index of the TB;
5. the number of transmissions of the current TB;
6, priority of load service in PSSCH;
if PRB index i of PSCCH is transmittedSAN for scheduled PSSCH transmission less than the index of all PRBs in the PSSCH resource pool PRB set with which it is associatedPSSCHEach PRB index is iSA+1，iSA+2,…,iSA+NPSSCH. Otherwise, if PRB index i of PSCCH is transmittedSAGreater than the index of all PRBs in the PSSCH resource pool PRB set with which it is associated, N for scheduled PSSCH transmissionPSSCHEach PRB index is iSA-1，iSA-2,…,iSA-NPSSCH。
If the current PSCCH and the PSCCH associated therewith support transmission mode two, the PSCCH should include one or more of the following information fields:
1. a subframe position of the scheduled PSSCH;
2. the PRB position occupied by the scheduled PSSCH;
3. a modulation coding mode of the scheduled PSSCH;
4. sending the ID of the UE;
5. transmitting an index of the TB;
6. the number of transmissions of the current TB;
priority of bearer service in PSSCH;
this embodiment ends by this. In this embodiment, if the PSCCH and the associated PSCCH resource pool support the first transmission mode, the PRB used for transmitting the PSCCH and the PRB used for transmitting the PSCCH are required to be contiguous in the frequency domain, which may easily result in fragmentation of frequency domain resources. The PSSCH resource pool is shared with the PSCCH resource pool supporting the second transmission mode, so that the problem can be effectively avoided.
The present application also discloses a V2X control channel and data channel transmission device, whose composition structure is shown in fig. 7, including: resource determining module and information sending module, wherein:
a resource determining module, configured to determine PSCCH transmission resources and associated pschs transmission resources;
and the information sending module is used for sending corresponding information on the determined PSCCH sending resources and the PSSCH sending resources.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (13)

1. A method for transmitting a control channel and a data channel in V2X communication, comprising:
the UE determines a resource set used for transmitting PSCCH and a PSSCH resource set associated with the UE, wherein the PSSCH resource set associated with the UE is the resource set used for transmitting PSSCH;
the UE determines a PSCCH time-frequency domain resource for transmitting the PSCCH in a resource set for transmitting the PSCCH;
the UE determines PSSCH time-frequency domain resources for transmitting the PSSCH within a PSSCH resource set associated with a resource set for transmitting the PSCCH;
and the UE sends corresponding information on the determined PSCCH time-frequency domain resources and PSSCH time-frequency domain resources.
2. The method of claim 1,
the set of resources for transmitting the PSCCH is all resources of a PSCCH resource pool, and the set of PSCCH resources associated therewith is all resources of the PSCCH resource pool associated with the PSCCH resource pool.
3. The method of claim 1,
the set of resources for transmitting the PSCCH is a subset of a PSCCH resource pool, and the set of PSCCH resources associated therewith is a subset of the PSCCH resource pool; the sub-frames contained in the PSCCH resource pool and the sub-frame contained in the PSSCH resource pool are completely the same, and the PRB positions are not overlapped.
4. The method of claim 1, wherein the UE determines the PSCCH resource set associated with the PSCCH resource pool according to a plurality of PSCCH resource pools having a binding relationship with a current PSCCH resource pool, wherein the plurality of PSCCH resource pools having the binding relationship are associated with the same PSCCH resource pool, and wherein the subframe set of the PSCCH resource pool is a union of the subframe sets of the plurality of PSCCH resource pools associated with the PSCCH resource pool.
5. The method of claim 4,
the set of subframes of the resource pool is uniquely determined by a bitmap and an offset value, wherein the offset value represents an offset of the start of the set of subframes relative to the start of the V2X system frame.
6. The method of claim 5, wherein the bitmap is associated with subframes available for V2X communication that are consecutive after the offset value, wherein a first bit of the bitmap is associated with a beginning of the set of subframes, and wherein the bitmap is repeated a plurality of times until it occupies a V2X system frame period, and wherein if the length of the V2X system frame period is not an integer multiple of the bitmap length, the portion of the bitmap that is repeated last beyond a V2X system frame period is truncated.
7. The method of claim 1,
if a binding relationship exists between the PSCCH resource pool C1 and another PSCCH resource pool C2, and C2 and the PSCCH resource pool S2 associated therewith support transmission mode one, the subframe set of the PSCCH resource pool S1 associated with C1 is the union of the subframe set of C1 and the subframe set of C2; also, the PRB set of S1 should be a superset of the PRB set of S2.
8. The method of claim 1, wherein the UE transmits corresponding information on the determined PSCCH time-frequency domain resource and PSCCH time-frequency domain resource, comprising:
the UE sends the PSCCH and the PSSCH scheduled by the PSCCH in the same subframe;
alternatively, the UE transmits the PSCCH scheduled by the PSCCH before transmitting the PSCCH.
9. The method of claim 1, wherein the UE determines PSCCH time-frequency domain resources required for transmitting the PSCCH within a set of resources used for transmitting the PSCCH, comprising:
the UE judges whether a plurality of available PSCCH resources exist in the current transmission period, if so, the UE can randomly select the PSCCH resources from the available PSCCH resources, preferentially select the PSCCH resources with the nearest time position from the available PSCCH resources, or preferentially select the PSCCH resources with the lowest interference level from the available PSCCH resources;
wherein, the set of resources for transmitting the PSCCH is all resources of a PSCCH resource pool, if the subframe n belongs to the PSCCH resource pool selected by the UE and the interval between the subframe n and the generation time of the data pre-transmitted by the UE is less than the maximum tolerated time delay of the data, the UE determines the PSCCH resource Sc of the subframe n as an available PSCCH resource when the PSCCH resource Sc of the subframe n meets one of the following conditions,
the UE sends PSCCH in PSCCH resources Sc of the subframe n-P;
the UE detects that the energy mean value of a PSCCH resource Sc on a subframe n-iP is smaller than a preset threshold, wherein i belongs to (0, a);
the service sent by the UE belongs to a specific priority;
where P is the transmission period of the UE and a is a specific value.
10. The method of claim 1, wherein the UE determines PSSCH time-frequency domain resources for transmitting PSSCH within a set of PSSCH resources associated with a set of resources for transmitting PSCCH, comprising:
the resource set for sending the PSSCH is all resources of a PSSCH resource pool;
if a set Sd composed of one or more PRBs in a PSSCH resource pool where the subframe m is located meets one of the following conditions, the UE regards Sd as an available PSCCH resource:
the UE sends PSSCH on resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; moreover, one or more PRBs within the set Sd are not occupied by other UEs transmitting data above a certain priority;
the UE has not sent the PSSCH on the resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; moreover, the UE detects that the energy mean value of the PSCCH resources Sd on the subframe m-lP is smaller than a preset threshold, wherein l belongs to (0, b);
the UE has not sent the PSSCH on the resource Sd in the PSSCH resource pool of the sub-frame m-P; moreover, the interval between the subframe m and the generation time of the data pre-sent by the UE is less than the maximum tolerant delay of the data; furthermore, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; moreover, when some or all PRBs in Sd are scheduled by PSCCHs transmitted by other UEs, the UE detects that a mean value of powers of one or more PSCCHs scheduling the PRBs is less than a booking threshold;
the UE detects that the energy mean value of PSSCH resources Sd on a subframe m-lP is smaller than a preset threshold, wherein l belongs to (0, b);
if the UE finds that the available PSSCH resources exist in a plurality of sub-frames in the current transmission period and the available PSCCH resources are enough to bear the data packets transmitted by the UE, the UE randomly selects the PSSCH resources from the available PSSCH resources or preferentially selects the PSSCH resources with the closest time position.
Wherein b is a specific value.
11. The method of claim 1, wherein if the UE transmits data above a predetermined priority, the UE determines that the time interval between the PSCCH time-frequency domain resource used to transmit the PSCCH and the PSCCH time-frequency domain resource used to transmit the PSCCH scheduled by the PSCCH should be greater than a predetermined value.
12. The method of claim 1,
if PRB index i of PSCCH is transmittedSAN for scheduled PSSCH transmission less than the index of all PRBs in the PSSCH resource pool PRB set with which it is associatedPSSCHEach PRB index is iSA+1，iSA+2,…,iSA+NPSSCH(ii) a If PRB index i of PSCCH is transmittedSAGreater than the index of all PRBs in the PSSCH resource pool PRB set with which it is associated, N for scheduled PSSCH transmissionPSSCHEach PRB index is iSA-1，iSA-2,…,iSA-NPSSCH。
13. A V2X control channel and data channel transmission device, comprising: the system comprises a resource determining module and an information sending module;
the resource determining module is used for determining PSCCH (serving primary control channel) sending resources and associated PSSCH sending resources;
and the information sending module is used for sending corresponding information on the determined PSCCH sending resources and PSSCH sending resources.
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