CN113259052A

CN113259052A - Method performed by user equipment and user equipment

Info

Publication number: CN113259052A
Application number: CN202010089658.XA
Authority: CN
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2020-02-12
Filing date: 2020-02-12
Publication date: 2021-08-13
Also published as: WO2021160034A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: receiving configuration information sent by a base station gNB; determining a number N of REs allocated for PDSCH transmission in one PRB within a CSI reference resource_RE'; according to said N_RE' determining a transport block bit number, TBS, within the CSI reference resource; and deducing a CQI value according to the TBS in the CSI reference resource.

Description

Method performed by user equipment and user equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method performed by a user equipment and a corresponding user equipment.

Background

In the Rel-15 NR, a Channel information feedback mechanism is supported, which is called Channel State Indicator Reporting, CSI Reporting or CSI Reporting for short. The CSI report comprises a Channel Quality Indicator (CQI), a channel Rank (RI) and a channel matrix (PMI). The scheme of the patent mainly aims at the reporting of the channel quality CQI in the CSI reporting, and the RI and the PMI are not repeated.

In Rel-15 NR, periodic (periodic), semi-persistent (SP) and aperiodic (aperiodic) CSI reporting are supported, and the reported content (CQI in this patent) may be fed back on a PUCCH channel or a PUSCH channel. In the specification of this patent, the scheme of aperiodic CSI reporting is included, but not limited. In Rel-15 NR, aperiodic CSI reporting is configured and triggered by combining MAC CE with DCI, and is reported based on PUSCH. The RRC configures a plurality of CSI trigger states, each CSI trigger state can correspond to one or a plurality of reporting feedback settings, and one reporting feedback setting is triggered by a CSI request field (CSI request field) in the DCI. The size of the CSI request field in DCI format 0_1 may be configured by RRC signaling to 0-6 bits, and thus may indicate 64 CSI trigger states at most. When the RRC configured CSI trigger state exceeds 64, mapping 64 CSI trigger states to a CSI request domain by MAC CE signaling.

The scheme of the patent includes a method for User Equipment (UE) to derive (derive) a CQI value (CQI index) according to a certain assumption.

In a conventional cellular network, all communications must pass through the base station. In contrast, D2D communication (Device-to-Device communication, direct Device-to-Device communication) refers to a communication method in which two user devices communicate directly without forwarding through a base station or a core network. The research topic on the realization of the D2D-adjacent communication service by LTE devices was approved at RAN #63 of 3rd Generation Partnership Project (3 GPP) in 2014 (see non-patent document 1). Functions introduced by LTE Release 12D 2D include:

1) discovery function (Discovery) between adjacent devices in an LTE network coverage scenario;

2) a direct Broadcast communication (Broadcast) function between neighboring devices;

3) the higher layer supports Unicast (Unicast) and multicast (Groupcast) communication functions.

On the 3GPP RAN #66 congress of 12 months in 2014, the research project of enhanced LTE eD2D (enhanced D2D) was approved (see non-patent document 2). The main functions introduced by LTE Release 13 eD2D include:

1) D2D discovery of no-network coverage scenarios and partial-network coverage scenarios;

2) priority handling mechanism for D2D communications.

Based on the design of the D2D communication mechanism, the V2X feasibility study topic based on D2D communication was approved at the RAN #68 time congress of 3GPP at 6 months 2015. V2X shows that Vehicle to evolution is expected to realize the interaction between Vehicle and all entity information that may affect the Vehicle, in order to reduce accident, slow down traffic jam, reduce environmental pollution and provide other information services. The application scenario of V2X mainly includes 4 aspects:

1) V2V, Vehicle to Vehicle, i.e. Vehicle-to-Vehicle communication;

2) V2P, Vehicle to peer, i.e. the Vehicle sends a warning to pedestrians or non-motor vehicles;

3) V2N, Vehicle to Network, i.e. Vehicle connected mobile Network;

4) V2I, Vehicle to Infrastructure, i.e. the Vehicle communicates with road Infrastructure etc.

The 3GPP has divided the research and standardization work of V2X into 3 stages. The first phase was completed in 2016 and 9 months, mainly focusing on V2V, and was formulated based on LTE Release 12 and Release 13D 2D (also called sidelink communication), i.e., proximity communication technology (see non-patent document 3). V2X stage 1 introduced a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used to solve cellular internet of vehicles communication problems in high speed (up to 250 km/h) and high node density environments. The vehicles can interact with information such as position, speed and direction through the PC5 interface, i.e., the vehicles can communicate directly with each other through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14V 2X mainly include:

1) higher density DMRS to support high speed scenarios;

2) introducing a sub-channel (sub-channel) to enhance a resource allocation mode;

3) a user equipment aware (sensing) mechanism with semi-persistent scheduling (semi-persistent) is introduced.

The second stage of the research topic of V2X belongs to the research category of LTE Release 15 (see non-patent document 4), and the introduced main characteristics include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and feasibility research of transmit diversity.

At the 3GPP RAN #80 congress of 6 months in 2018, the corresponding third stage was approved based on the V2X feasibility study topic of 5G NR network technology (see non-patent document 5).

Documents of the prior art

Non-patent document

Non-patent document 1: RP-140518, Work item deployment on LTE Device to Device Proximity Services

Non-patent document 2: RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services

Non-patent document 3: RP-152293, New WI propofol: support for V2V services based on LTE sidelink

Non-patent document 4: RP-170798, New WID on 3GPP V2X Phase 2

Non-patent document 5: RP-181480, New SID Proposal: study on NR V2X

Disclosure of Invention

To address at least some of the above issues, the present invention provides a method performed by a user equipment and a user equipment.

According to a first aspect of the present invention, there is provided a method performed by a user equipment, comprising: receiving configuration information sent by a base station gNB; and the configuration information configures the CQI value reported by the user equipment.

In the above method, further comprising: determining a number N of REs allocated for PDSCH transmission in one PRB within a CSI reference resource_RE′。

In the above method, the number of subcarriers included in one PRB may be

And/or the user equipment assumes the number of symbols allocated for PDSCH and DMRS

And/or the user equipment assumes a number of REs for DMRS transmission within each PRB

In the above method, it may be that the user equipment assumes a number of REs within each PRB including, but not limited to, control signaling overhead

In the above method, it may be that the user equipment determines the

In the above method, further comprising: according to the number N of REs allocated for PDSCH transmission in one PRB in the CSI reference resource_RE' determining a transport block bit number, TBS, within the CSI reference resource.

In the above method, the ue may include but is not limited to the N_RE' determining a transport block bit number, TBS, within the CSI reference resource.

In the above method, further comprising: and deducing a CQI value according to the TBS in the CSI reference resource.

In the above method, the user equipment may derive a CQI value according to a TBS included in, but not limited to, the CSI reference resource.

According to a second aspect of the present invention, there is provided a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the above method.

Drawings

The above and other features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications.

Fig. 2 is a diagram illustrating a resource allocation scheme of LTE V2X.

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment in the first embodiment of the invention.

Fig. 4 is a block diagram illustrating a user equipment according to an embodiment of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted to prevent confusion of understanding of the present invention.

Embodiments according to the present invention are described in detail below with a 5G mobile communication system and its subsequent evolution as an example application environment. However, it is to be noted that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as a communication system after 5G and a 4G mobile communication system before 5G, and the like.

Some terms to which the present invention relates will be described below, and the terms to which the present invention relates are defined herein, unless otherwise specified. The terms given in the invention may adopt different naming manners in LTE, LTE-Advanced Pro, NR and the following communication systems, but the unified terms adopted in the invention can be replaced by the terms adopted in the corresponding systems when being applied to the specific systems.

3 GPP: 3rd Generation partnershift Project, third Generation Partnership Project

LTE: long Term Evolution, Long Term Evolution technology

NR: new Radio, New Wireless, New air interface

PDCCH: physical Downlink Control Channel, Physical Downlink Control Channel

DCI: downlink Control Information, Downlink Control Information

PDSCH: physical Downlink Shared Channel (pdcch)

UE: user Equipment, User Equipment

eNB: evolved NodeB, evolved node B

And g NB: NR base station

TTI: transmission Time Interval, Transmission Time Interval

OFDM: orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing

C-RNTI: cell Radio Network Temporary Identifier

CSI: channel State Indicator, Channel State Indicator

HARQ: hybrid Automatic Repeat Request (HARQ)

CSI-RS: CSI-Reference Signal, channel State measurement Reference Signal

CRS: cell Reference Signal, Cell specific Reference Signal

PUCCH: physical Uplink Control Channel, Physical Uplink Control Channel

PUSCH: physical Uplink Shared Channel, Physical Uplink Shared Channel

UL-SCH: uplink Shared Channel, Uplink Shared Channel

CG: configured Grant, configuring scheduling Grant

Sidelink: sidelink communications

SCI: sidelink Control Information, Sidelink communication Control Information

PSCCH: physical Sidelink Control Channel, Physical Sidelink communication Control Channel

MCS: modulation and Coding Scheme, Modulation and Coding Scheme

RB: resource Block, Resource Block

CRB: common Resource Block, Common Resource Block

And (3) CP: cyclic Prefix, Cyclic Prefix

PRB: physical Resource Block, Physical Resource Block

PSSCH: physical Sidelink Shared Channel, a Physical Sidelink communication Shared Channel

FDM: frequency Division Multiplexing, Frequency Division Multiplexing

RRC: radio Resource Control, Radio Resource Control

RSRP: reference Signal Receiving Power, Reference Signal Receiving Power

SRS: sounding Reference Signal

DMRS: demodulation Reference Signal

CRC: cyclic Redundancy Check (crc)

PSDCH: physical Sidelink Discovery Channel

PSBCH: physical Sidelink Broadcast Channel, Physical Sidelink communication Broadcast Channel

SFI: slot Format Indication

TDD: time Division Duplexing

FDD: frequency Division Duplexing

SIB 1: system Information Block Type 1, System Information Block Type 1

SLSS: sidelink synchronization Signal, a side-line communication synchronization Signal

PSSS: primary Sidelink Synchronization Signal, sideline communication Primary Synchronization Signal

SSSS: secondary Sidelink Synchronization Signal, sideline communication auxiliary Synchronization Signal

PCI: physical Cell ID, Physical Cell identity

PSS: primary Synchronization Signal, Primary Synchronization Signal

SSS: secondary Synchronization Signal, Secondary Synchronization Signal

BWP: bandwidth Part, BandWidth fragment/portion

GNSS: global Navigation Satellite positioning System (GNSS)

SFN: system Frame Number, System (radio) Frame Number

DFN: direct Frame Number, Direct Frame Number

IE: information Element, Information Element

And (3) SSB: synchronization Signal Block, synchronous System information Block

EN-DC: EUTRA-NR Dual Connection, LTE-NR Dual connectivity

MCG (calcium carbonate): master Cell Group, Master Cell Group

SCG: secondary Cell Group, Secondary Cell Group

PCell: primary Cell, Primary Cell

SCell: secondary Cell, Secondary Cell

PSFCH: physical Sidelink Feedback Channel, Physical Sidelink communication Feedback Channel

SPS: semi-persistent Scheduling, Semi-persistent Scheduling

TA: timing Advance, uplink Timing Advance

RBG: resource Block Group, Resource Block Group

MSB: most Significant Bit, the highest Bit

LSB: least Significant Bit of the

MAC: medium Access Control, Medium Access Control (layer/protocol)

MAC CE: MAC Control Element, MAC Control unit

QAM: quadrature Amplitude Modulation

QPSK: quadrature Phase Shift Keying (QPSK) modulation

The following is a description of the prior art associated with the inventive arrangements. Unless otherwise specified, the meanings of the same terms in the specific examples are the same as those in the prior art.

It is to be noted that V2X referred to in the description of the present invention has the same meaning as sidelink. V2X herein may also represent sidelink; similarly, sidelink herein may also refer to V2X, and is not specifically distinguished or limited hereinafter.

In the description of the present invention, the resource allocation method of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication may be replaced by equivalent methods. The resource allocation pattern referred to in the specification may indicate a transmission mode, and the transmission mode referred to may indicate a resource allocation pattern.

The resource block RB, the common resource block CRB, and the physical resource block PRB referred to in the description of the present invention all represent 12 consecutive subcarriers in the frequency domain. For example, for subcarrier spacing of 15kHz, the RBs, CRBs, PRBs occupy 180kHz in the frequency domain.

QPSK referred to in the description of the present invention represents quadrature shift keying modulation, which is a 2-order modulation scheme, i.e., one modulated symbol contains 2 bits; similarly, 16QAM, 64QAM, and 256QAM represent quadrature amplitude modulations with modulation orders of 4, 6, and 8, respectively, that is, one modulated symbol includes 4 bits, 6 bits, and 8 bits, respectively. The code rate indicates a channel coding rate or a channel coding efficiency. The number of bits of one transport block TB (containing the number of bits denoted as a) after channel coding (LDPC, etc.) is b, then the code rate is equal to a/b. Considering the added CRC parity (the number of bits included is denoted as c) before channel coding, the effective code rate (effective coding rate) referred to in the description of the present invention is equal to (a + c)/b, or the meaning of the effective code rate is the ratio of the number of bits of downlink information bits (the bits including the CRC parity) to the number of physical bits transmitted on the PDSCH. The spectral efficiency (or, efficiency) is equal to the product of the code rate and the modulation order. For example, taking 64QAM as an example, the code rate is 0.93, and then the spectral efficiency is equal to 0.93 × 6 — 5.58 (bps/Hz).

The CQI value referred to in the description of the present invention indicates a CQI index or a CQI value, and the meanings of the two may be equivalently replaced.

Parameter sets (numeroloay) in NR (including NR sidelink) and in NR (including NR) sidelink) of Slot slot

Parameter set numerology includes both subcarrier spacing and cyclic prefix CP length implications. Where NR supports 5 subcarrier spacings, 15k, 30k, 60k, 120k, 240kHz (corresponding to μ ═ 0, 1, 2, 3, 4), and table 4.2-1 shows the set of supported transmission parameters, as shown below.

TABLE 4.2-1 NR supported subcarrier spacing

μ	Δf＝2^μ·15[kHz]	CP (Cyclic prefix)
			0	15	Is normal
1	30	Is normal
			2	60	Normal, extended
3	120	Is normal
			4	240	Is normal

Extended (Extended) CP is supported only when μ ═ 2, i.e., in the case of 60kHz subcarrier spacing, and only normal CP is supported in the case of other subcarrier spacing. For Normal (Normal) CP, each slot (slot) contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For a sub-carrier spacing of 15kHz, 0, 1 slot 1 ms; mu is 1, namely 30kHz subcarrier interval, and 1 time slot is 0.5 ms; mu is 2, i.e. 60kHz subcarrier spacing, 1 slot is 0.25ms, and so on.

NR and LTE have the same definition for a subframe (subframe), indicating 1 ms. For subcarrier spacing configuration μ, the slot number within 1 subframe (1ms) may be expressed as

In the range of 0 to

The slot number within 1 system frame (frame, duration 10ms) can be expressed as

In the range of 0 to

Wherein the content of the first and second substances,

and

the definition of the case at different subcarrier spacings μ is shown in the table below.

Table 4.3.2-1: the number of symbols contained in each slot, the number of slots contained in each system frame and the number of slots contained in each subframe during normal CP

Table 4.3.2-2: when CP is expanded (60kHz), the number of symbols contained in each slot, the number of slots contained in each system frame, and the number of slots contained in each subframe

On the NR carriers, the numbered SFN of the system frame (or simply frame) ranges from 0 to 1023. The concept of a direct system frame number DFN is introduced in the sidelink communication, again with a number ranging from 0 to 1023, and the above statements on the relation between system frames and numerology are equally applicable to direct system frames, e.g. a direct system frame having a duration equal to 10ms, a direct system frame comprising 10 slot slots for a subcarrier spacing of 15kHz, etc. DFN is applied for timing on sidelink carriers.

Bandwidth fragment (BWP)

In NR, one or more bandwidth segments may be defined for each parameter set numerology. Each BWP contains one or more consecutive CRBs. Assuming that the number of a BWP is i, its starting point

(alternatively, use

To express) and length

(alternatively, use

To represent) must satisfy the following relationships simultaneously:

that is, the CRB included in the BWP must be located within the corresponding numerology resource grid.

The distance from the lowest-numbered CRB of the BWP to point a is represented in RB units using the CRB number.

Resource blocks within a BWP are referred to as Physical Resource Blocks (PRBs), which are numbered as

Wherein physical resource block 0 corresponds to the lowest numbered CRB of the BWP, i.e., CRB

For a certain serving cell, the gNB configures a certain BWP with the following high-level parameters:

1) a subcarrier spacing;

2) CP length;

3) the high level parameter locationandBandwidth indicates the BWP relative to the resource grid starting CRB

Offset value of (RB)_start) And the number L of consecutive CRBs in the BWP frequency domain_RBSatisfy the following requirements

Wherein O is_carrierDenotes offset ToCarrier; wherein the parameter locationandBandwidth indicates an RIV (Resource Indication Value). RIV about L_RBAnd RB_startThe calculation relationship is as follows: if it is not

Then

If not, then,

wherein the content of the first and second substances,

and the number of the first and second electrodes,

4) the BWP number;

5) BWP common and BWP specific parameter configuration, such as the configuration of PDCCH and PDSCH of downlink BWP.

Indication and determination method of NR TDD configuration information

This section describes the slot structure of the higher layer configuration in the specification, i.e. whether a certain slot of the higher layer configuration contains a downlink symbol or a flexible symbol.

The NR base station gNB configures the TDD configuration information of the cell level through 7DD-UL-DL-ConfigCommon in SIB1, which includes:

● reference subcarrier spacing mu_ref；

● high-level parameters pattern1 (the information element is optional and represents TDD configuration style 1, the same below), which includes the following high-level parameters:

■ configuration period P (ms);

■ number of downstream time slots d_slotsThe downlink time slot only contains downlink OFDM symbols (which can be called DL-only time slot);

■ number of downlink OFDM symbols d_sym；

■ number u of upstream time slots_slotsThe uplink time slot only contains uplink OFDM symbols (which may be called UL-only time slot);

■ number u of uplink OFDM symbols_sym。

The period of the configuration information is P ms, corresponding to continuous

And a time slot. In S time slots, d is first_slotsA downlink time slot u_slotsThe uplink slots are located at the end of the S slots. d_symOne downlink OFDM symbol is located at d_slotsAfter one downlink time slot, u_symOne uplink OFDM symbol is located at u_slotsBefore one uplink time slot, the rest

Each OFDM symbol is an X symbol (X denotes a flexible symbol). The X symbol may be a downlink symbol, an uplink symbol, or a guard interval symbol between downlink and uplink in different application scenarios. Wherein, for normal CP (normal CP),

for extended cp (extended cp),

the TDD-UL-DL-ConfigCommon in SIB1 may contain a higher layer parameter pattern2 (this information element is Optional and indicates TDD configuration pattern2, the same below). The pattern2 and the pattern1 have the same configuration information (the parameters of the pattern2 include the periods P2, d_slots，2，u_slots，2，d_sym，2，u_sym，2) The corresponding parameters are the same as the corresponding pattern1 parameters. Reference subcarrier spacing mu_refIs the same as pattern1, so the reference subcarrier spacing μ is not repeatedly configured for pattern2_ref. The period of the configuration information is P2 ms, corresponding to continuous

And a time slot. In S2 time slots, d is first_slots，2A downlink time slot u_slots，2The uplink time slots are located at the end of the S2 time slots. d_sym，2After a downlink OFDM symbol is located in a downlink time slot, u_sym，2One uplink OFDM symbol is located before the uplink time slot, and the rest

Each OFDM symbol is an X symbol (X denotes a flexible symbol). The X symbol may be a downlink symbol in different application scenariosThe number is either an uplink symbol or a guard interval symbol between downlink and uplink. Wherein, for normal CP (normal CP),

for extended cp (extended cp),

when the TDD-UL-DL-ConfigCommon includes both pattern1 and pattern2, the TDD configuration information has a configuration period of (P + P2) ms, which includes the above-mentioned S and S2 time slots (S in time domain first, and S2 second).

The periods P and P2 in the configuration information satisfy the following conditions:

1) p is a divisor of 20, i.e. P can be divided by 20, and the first time domain symbol of every 20/P periods is the first symbol of an even frame;

2) p + P2 is a divisor of 20, i.e., P + P2 is divisible by 20, while it is required that the first time domain symbol every 20/(P + P2) cycles is the first symbol of an even frame.

Preferable ranges of P and P2 include {0.5, 0.625, 1, 1.25, 2, 2.5, 5, 10} ms. The values of P and P2 also include 3ms and 4ms, as represented by IE: dl-UL-Transmission permission-v 1530. When the base station configures dl-UL-Transmission permission-v 1530 in pattern1/2, the UE ignores the dl-UL-Transmission permission corresponding to pattern 1/2.

CQI value (CQI index)

In Rel-15 NR, taking the case of containing 256QAM as an example, the CQI values and the corresponding meanings are shown in Table 5.2.2.1-3.

TABLE 5.2.2.1-3: CQI numerical table including 256QAM

Modulation mode and transport block bit number TBS corresponding to one CQI value (CQI index)

As shown in table 5.2.2.1-3, each CQI value corresponds to (correlation to) a set of (a combination of) modulation schemes and code rates. In Rel-15 NR, one set of modulation scheme (modulation scheme) and transport block bit number TBS corresponds to one CQI value (0 to 15 in table 5.2.2.1-3) when the following three conditions are satisfied simultaneously.

1) The set of modulation schemes and the TBS determined according to the PDSCH TBS determination method may be transmitted through a signaling indication (MCS indication field) in DCI and on a PDSCH occupying a CSI reference resource (CSI reference resource);

2) the modulation scheme is indicated by the modulation scheme indicated by the CQI value in table 5.2.2.1-3;

3) the effective code rate of the PDSCH transmitted on the CSI reference resource in the above condition 1) is closest to the code rate indicated by the (close to) CQI value (see table 5.2.2.1-3).

CSI reference resource (CSI reference resource)

The CSI reference resource of one serving cell (serving cell) is defined as follows:

1) for frequency domain resources, the CSI reference resource represents a set of derived (derived) CSI-related (related) downlink PRBs;

2) for the time domain resource, assuming that CSI reporting is performed in the uplink timeslot n', the time domain resource of the CSI reference resource is a downlink timeslot, denoted as n-n_{CSI_ref}Wherein, in the step (A),

μ_DLand mu_ULRespectively showing the configuration of the downlink and uplink subcarrier spacing.

For n in Rel-15 NR_{CSI_ref}The definition of (taking aperiodic CSI reporting as an example):

■ for aperiodic CSI reporting, if a CSI request field (CSI request field) in the DCI indicates that CSI reporting and CSI request are in the same time slot, then n_{CSI_ref}The value of (2) makes the CSI reference resource and the corresponding CSI request be the same effective downlink slot (valid downlink slot). Otherwise, n_{CSI_ref}Is not less than the delay requirement (d)elay requirement in time slot) and satisfies n-n_{CSI_ref}Corresponding to an effective downlink timeslot.

Effective downlink time slot (valid downlink slot)

In a serving cell, an effective downlink timeslot is determined when one timeslot slot satisfies the following two conditions.

1) The time slot at least comprises a downlink symbol configured by a high layer or a flexible symbol;

2) for the UE, the timeslot does not fall within the measurement gap (measurement gap) range.

Method for determining PDSCH TBS

In Rel-15 NR, the method for determining PDSCH TBS includes 4 steps, and the scheme of the present invention mainly aims at the assumption condition for determining TBS in the CQI value derivation process, so only the first step related thereto is described, and steps 2 to 4 are not repeated herein.

The first step of the TBS determination method can be summarized as determining the number N of resource elements RE used for PDSCH transmission in one slot_RE。

■ UE first determines the number N of REs allocated for PDSCH transmission in one PRB_RE′。

Wherein the content of the first and second substances,

represents the number of subcarriers contained in one PRB;

represents the number of symbols of the PDSCH transmission allocated in one slot;

means for indicating a number of REs used for DMRS transmission within each PRB;

a value representing the RRC cell xOverhead (in the case where xOverhead is configured), if xOverhead is default (absent or not present), then

Is 0.

■ the UE then determines the number of REs N used for PDSCH transmission in one slot_RE. Wherein N is_RE＝min(156，N＇_RE)×n_PRBWherein n is_PRBIndicating the number of PRBs allocated for PDSCH transmission.

Framework (framework) of CQI numerical derivation (derivative) method

It should be noted that the UE determines the TBS according to a modulation scheme and a target code rate (target code rate) corresponding to the MCS index (MCS index), determines an effective code rate of the TB by combining CSI reference resources, and then determines a code rate indicated by the closest CQI index, that is, may determine the CQI index.

The UE derives a CQI value (CQI value) reported in the uplink slot n as a maximum CQI value (CQI index) satisfying the following condition.

■ corresponds to a PDSCH transport block TB that is indicated by a group of modulation modes and transport block bit numbers TBS of a CQI index, the transmitted time-frequency resource is a CSI reference resource, can be received by the UE, and the block error rate (transport block error probability) does not exceed 0.1 or 0.00001. Corresponding to table 5.2.2.1-3, this value is 0.1.

In summary, in Rel-15 NR, the framework of the method for UE to derive the reported CQI value is as follows:

1) the UE determines a CSI reference resource;

2) the UE determines TBS of PDSCH on the CSI reference resource according to one or more assumed conditions and judges whether the block error rate exceeds 0.1 or 0.00001;

3) if the block error rate does not exceed 0.1 or 0.00001, the UE determines the effective code rate of the PDSCH TB transmission and determines the corresponding CQI value;

4) the UE continuously increases the MCS index and determines that the block error rate does not exceed the maximum CQI value corresponding to 0.1 or 0.00001, i.e. as the derived CQI value.

The scheme of the invention mainly aims at a determination method of an assumed condition when the UE determines the TBS of the PDSCH on the CSI reference resource.

Scenarios for Sidelink communications

1) Out-of-Coverage (Out-of-Coverage) sidelink communication: neither UE performing sidelink communication has network coverage (e.g., the UE does not detect any cell satisfying the "cell selection criterion" on the frequency on which the sidelink communication is required, indicating that the UE has no network coverage).

2) Network Coverage (In-Coverage) side communication: both UEs performing sidelink communications have network coverage (e.g., the UE detects at least one cell satisfying the "cell selection criteria" on the frequency on which the sidelink communications are desired, indicating that the UE has network coverage).

3) Partial-Coverage (Partial-Coverage) sidelink communications: one of the UEs performing sidelink communication has no network coverage, and the other UE has network coverage.

From the UE side, the UE has only two scenarios, namely, network coverage and non-network coverage. Partial network coverage is described from the perspective of sidelink communications.

Basic procedure for LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications. First, the UE1 transmits sidelink communications control information (SCI format 1), carried by the physical layer channel PSCCH, to the UE 2. SCI format 1 includes scheduling information of the pscch, such as frequency domain resources of the pscch. Second, UE1 transmits sidelink communications data to UE2, carried by the physical layer channel PSSCH. The PSCCH and the corresponding PSCCH are frequency division multiplexed, that is, the PSCCH and the corresponding PSCCH are located on the same subframe in the time domain and are located on different PRBs in the frequency domain. The specific design modes of the PSCCH and the PSSCH are as follows:

1) the PSCCH occupies one subframe in the time domain and two consecutive PRBs in the frequency domain. The initialization of the scrambling sequence takes a predefined value 510. The PSCCH may carry SCI format 1, where SCI format 1 at least includes frequency domain resource information of the PSCCH. For example, for the frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the pschs corresponding to the PSCCH.

2) The PSCCH occupies one subframe in the time domain, and the corresponding PSCCH employs Frequency Division Multiplexing (FDM). The PSSCH occupies one or more continuous sub-channels in the frequency domain, and the sub-channels represent n in the frequency domain_subCHsizeA plurality of consecutive PRBs, n_subCHsizeConfigured by RRC parameters, the number of starting sub-channels and consecutive sub-channels is indicated by the frequency domain resource indication field of SCI format 1.

LTE V2X resource allocation Mode Transmission 3/4

Fig. 2 shows two resource allocation manners of LTE V2X, which are respectively referred to as resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (sensing) (Transmission Mode 4). In LTE V2X, when there is eNB network coverage, a base station may configure a resource allocation manner of a UE, or referred to as a transmission mode of the UE, through UE-level proprietary RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, specifically:

1) resource allocation scheme based on base station scheduling (Transmission Mode 3): the resource allocation method based on base station scheduling represents that the frequency domain resources used by sidelink communication are scheduled by the base station. The transmission mode 3 includes two scheduling modes, namely dynamic scheduling and semi-persistent scheduling (SPS). For dynamic scheduling, the UL grant (DCI format 5A) includes frequency domain resources of the pscch, and the CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by the SL-V-RNTI. For SPS semi-persistent scheduling, the base station passes IE: the SPS-ConfigSL-r14 configures one or more (up to 8) configured scheduling grants (configured grant), each configured scheduling grant containing a scheduling grant number (index) and a resource period of the scheduling grant. The UL grant (DCI format 5A) includes frequency domain resources of the psch, and indication information (3bits) of a scheduling grant number and indication information of SPS activation (activation) or release (release or deactivation). The CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by SL-SPS-V-RNTI.

Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it indicates that the UE is configured to a transmission mode based on base station scheduling. The base station configures SL-V-RNTI or SL-SPS-V-RNTI through RRC signaling, and sends uplink scheduling permission UL grant to the UE through PDCCH or EPDCCH (DCI format 5A, CRC adopts SL-V-RNTI scrambling or adopts SL-SPS-V-RNTI scrambling). The uplink scheduling grant UL grant at least includes scheduling information of psch frequency domain resources in sidelink communication. And when the UE successfully monitors PDCCH or EPDCCH scrambled by SL-V-RNTI or SL-SPS-V-RNTI, taking a PSSCH frequency domain resource indication domain in an uplink scheduling grant UL grant (DCI format 5A) as indication information of a PSSCH frequency domain resource in the PSCCH (SCI format 1), and sending the PSCCH (SCI format 1) and the corresponding PSSCH.

For semi-persistent scheduling SPS in transmission mode 3, the UE receives DCI format 5A scrambled by SL-SPS-V-RNTI on downlink subframe n. If the DCI format 5A contains indication information of SPS activation, the UE determines frequency domain resources of the PSSCH according to the indication information in the DCI format 5A, and determines time domain resources of the PSSCH (transmission sub-frame of the PSSCH) according to information such as sub-frame n and the like.

2) Resource allocation method based on UE sensing (sensing) (Transmission Mode 4): the UE sensing-based resource allocation mode represents a sensing (sensing) process of a UE-based candidate available resource set for sidelink communication. The RRC signaling SL-V2X-ConfigDedicated when set to UE-Selected-r14 indicates that the UE is configured to transmit mode based on UE sending. In the UE sensing-based transmission mode, the base station configures an available transmission resource pool, and the UE determines a sidelink transmission resource of the PSCCH in the transmission resource pool (resource pool) according to a certain rule (for a detailed description of the procedure, see LTE V2X UE sensing procedure part), and transmits the PSCCH (SCI format 1) and the corresponding PSCCH.

Specific examples, embodiments, and the like according to the present invention will be described in detail below. As described above, the examples and embodiments described in the present disclosure are illustrative for easy understanding of the present invention, and do not limit the present invention.

[ example one ]

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a first embodiment of the present invention.

The method executed by the ue according to the first embodiment of the present invention is described in detail below with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in a first embodiment of the present invention, the steps performed by the user equipment include:

in step S101, the ue receives configuration information sent by the base station gNB.

Optionally, the configuration information configures a CQI value (CQI index) reported by the ue, or the configuration information includes configuration information configuring the CQI index reported by the ue.

In step S102, the user equipment determines the number N of REs allocated for PDSCH transmission in one PRB in the CSI reference resource_RE′。

Optionally, the number of subcarriers contained in one PRB

Optionally, the user equipment assumes (or, assumes) that the number of symbols allocated for the PDSCH and the DMRS is equal to or greater than a predetermined number

Optionally, the user equipment assumes (or, alternatively, assumes) that the symbols for PDSCH transmission (PDSCH symbols) do not include DMRS,

alternatively, the first and second electrodes may be,

optionally, the user equipment assumes (or, assumes) the number of REs used for DMRS transmission within each PRB

Optionally, the user equipment assumes (or, assume) (within each PRB) the number of REs including, but not limited to, control signaling overhead

Optionally, the user equipment determines the

In step S103, the ue allocates the number N of REs for PDSCH transmission in one PRB in the CSI reference resource_RE' determining a transport block bit number, TBS, within the CSI reference resource.

Optionally, the user equipment is according to including but not limited to the N_RE' determining a transport block bit number, TBS, within the CSI reference resource.

In step S104, optionally, the user equipment derives a CQI value (CQI index) according to the TBS in the CSI reference resource.

Optionally, the user equipment derives a CQI value (CQI index) from the TBS within the CSI reference resource, including but not limited to.

[ example two ]

Fig. 3 is a diagram showing a basic procedure of a method performed by a user equipment according to a second embodiment of the present invention.

Next, the method executed by the user equipment according to the second embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in the second embodiment of the present invention, the steps performed by the user equipment include:

Alternatively,number of subcarriers included in one PRB

alternatively, the first and second electrodes may be,

Alternatively, if the PDSCH reception (PDSCH reception) CP length is configured as extended CP (ecp), then the user equipment assumes (or, assume) (within each PRB) the number of REs including, but not limited to, control signaling overhead

Optionally, the user equipment determines the

[ third example ]

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a third embodiment of the present invention.

Next, the method executed by the user equipment according to the third embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in the third embodiment of the present invention, the steps performed by the user equipment include:

Optionally, the number of subcarriers contained in one PRB

alternatively, the first and second electrodes may be,

Alternatively, a value equal to the higher level configuration is assumed.

Alternatively, if the PDSCH reception (PDSCH reception) CP length is configured as normal CP (ncp), then the user equipment assumes (or, assume) (within each PRB) the number of REs including, but not limited to, control signaling overhead

Equal to the value of the higher level configuration, or, assuming

Optionally, the user equipment determines the

Fig. 4 is a block diagram showing a user equipment UE according to the present invention. As shown in fig. 4, the user equipment UE80 includes a processor 801 and a memory 802. The processor 801 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 802 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 802 has stored thereon program instructions. Which when executed by the processor 801 may perform the above-described method performed by the user equipment as described in detail herein.

The method of the invention and the apparatus involved have been described above in connection with preferred embodiments. It will be appreciated by those skilled in the art that the above illustrated approaches are exemplary only, and that the various embodiments described above can be combined with each other without conflict. The method of the present invention is not limited to the steps or sequence shown above. The network nodes and user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future, which may be available to a base station, MME, or UE, etc. The various identifiers shown above are exemplary only and not limiting, and the invention is not limited to the specific information elements that are examples of these identifiers. Many variations and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.

It should be understood that the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, various components within the base station and the user equipment in the above embodiments may be implemented by various means, including but not limited to: analog circuit devices, Digital Signal Processing (DSP) circuits, programmable processors, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), programmable logic devices (CPLDs), and the like.

In this application, a "base station" may refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, and includes functions of resource allocation scheduling, data receiving and transmitting, and the like. "user equipment" may refer to a user mobile terminal, including, for example, a mobile phone, a notebook, etc., which may wirelessly communicate with a base station or a micro base station.

Furthermore, embodiments of the invention disclosed in this document can be implemented on a computer program product. More specifically, the computer program product is one of the following: there is a computer readable medium having computer program logic encoded thereon that, when executed on a computing device, provides related operations for implementing the above-described aspects of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in embodiments of the present invention. Such arrangements of the invention are typically provided as downloadable software images, shared databases, etc. arranged or encoded in software, code and/or other data structures on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy or hard disk or other medium such as firmware or microcode on one or more ROM or RAM or PROM chips or in one or more modules. The software or firmware or such configurations may be installed on a computing device to cause one or more processors in the computing device to perform the techniques described in embodiments of the present invention.

Further, each functional block or respective feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. Further, when advanced technology capable of replacing the current integrated circuit is developed due to the advancement of semiconductor technology, the present invention can also use the integrated circuit obtained by the advanced technology.

Although the present invention has been described in conjunction with the preferred embodiments thereof, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention. Accordingly, the present invention should not be limited by the above-described embodiments, but should be defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment, comprising:

receiving configuration information sent by a base station gNB;

and the configuration information configures the CQI value reported by the user equipment.

2. The method of claim 1, further comprising:

determining a number N of REs allocated for PDSCH transmission in one PRB within a CSI reference resource_RE′。

3. The method of claim 2,

number of subcarriers included in one PRB

And/or

The user equipment assumes allocation of the number of symbols for the PDSCH and the DMRS

And/or

The user equipment assumes the number of REs used for DMRS transmission within each PRB

4. The method of claim 2,

the user equipment assumes that the number of REs including but not limited to control signaling overhead within each PRB

5. The method of claim 2,

the user equipment determines the

6. The method of claim 2, further comprising:

according to the number N of REs allocated for PDSCH transmission in one PRB in the CSI reference resource_RE' determining a transport block bit number, TBS, within the CSI reference resource.

7. The method of claim 6,

the user equipment according to the method including but not limited to the N_RE' determining a transport block bit number, TBS, within the CSI reference resource.

8. The method of claim 6, further comprising:

and deducing a CQI value according to the TBS in the CSI reference resource.

9. The method of claim 8,

the user equipment derives CQI values from TBS including but not limited to the CSI reference resources.

10. A user equipment, comprising:

a processor; and

a memory storing instructions;

wherein the instructions, when executed by the processor, perform the method of any of claims 1 to 9.