Transmission and reception method and equipment in V2X communication

A receiving method and a technology of sending resources, which are applied in wireless communication, vehicle wireless communication service, transportation and packaging, etc., and can solve the problem that the power relationship is not optimal

Pending Publication Date: 2018-10-09
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In LTE Rel-15 or subsequent versions, with the increase of PSSCH modulation and coding rate, in order to achieve the same reception performance of PSSCH and PSCCH, the existing power relationship is not optimal and needs to be improved

Method used

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  • Transmission and reception method and equipment in V2X communication
  • Transmission and reception method and equipment in V2X communication
  • Transmission and reception method and equipment in V2X communication

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Experimental program
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Embodiment 1

[0074] In order to increase the transmission rate of the second type of V2X UE, a higher modulation method, 64QAM, is introduced. In order to support the coexistence of the first type of V2X UE and the second type of V2X UE, it is necessary for the first type of V2X UE to consider resources that may be occupied by the second type of V2X UE when selecting transmission resources. One resource includes one or more continuous sub-channels, and one sub-channel includes N consecutive physical resource blocks (PRBs), where N is configured or pre-configured by high-layer signaling. The existing transmission resource selection method includes the following steps (see section 14.1.1.6 in TS 36.213):

[0075] Step1: The first type of V2X UE determines the time-frequency resource position and priority of the scheduled PSSCH by receiving the PSCCH sent by other UEs.

[0076] The other UEs may be UEs of the same type, or UEs of different types.

[0077] Step 2: The first type of V2X UE de...

Embodiment 2

[0124] Generally, when a data packet is initially transmitted, if the coding rate exceeds 0.93, the UE may not be able to demodulate the data packet correctly, so the UE may not demodulate the data packet. In the LTE Rel-8 system, when defining the transport block size (Table 7.1.7.2.1-1~7.1.7.2.5-1 in 3GPP TS36.213), I TBS = 0 to 25, it is assumed that the number of resources mapped by TB is 120 resources (RE) in each PRB, S I BT = 26, it is assumed that each PRB contains 136 resources (REs) for the number of resources mapped by the TB, so the effective coding rate determined according to the TBS in the table and the number of physical resources mapped by the TB does not exceed 0.93. However, in the V2X communication in LTE Rel-14 / 15, since among the 14 symbols in a subframe, the first symbol is used as AGC adjustment, the 3rd, 6th, 9th, and 12th symbols are mapped to the demodulation reference signal (DM -RS), the last symbol is used as a gap (Gap), so the symbols that can...

Embodiment 3

[0147] Embodiment 3: In V2X communication in LTE Rel-14 / 15, since among the 14 symbols in a subframe, the first symbol is adjusted as AGC, the 3rd, 6th, 9th, and 12th symbols are mapped and demodulated Reference signal (DM-RS), the last symbol is used as a gap (Gap), so the symbols that can actually be used for effective data transmission are 8 symbols, that is, the number of resources mapped by TB is only 96 resources (RE) in each PRB . Therefore, if the MCS table (Table 2) and TBS table (Table 7.1.7.2.1-1 in 3GPP TS36.213) of LTE Rel-8 are reused, part I MCS The case where the effective code rate exceeds 0.932. In order to avoid the effective coding rate exceeding 0.932, only the remaining I MCS , making the flexibility of supportable TBS compromised. Especially after supporting 64QAM, for example in Table 2, I MCS All I's >23 MCS are unavailable. In the same way, in V2X communication in LTE Rel-14 / 15 or NR, a V2X transmission can occupy shorter time resources, for exa...

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Abstract

An embodiment of the invention provides a transmission and reception method in vehicle-to-everything (V2X) communication. The transmission and reception method comprises the steps that a first type ofUE detects a PSCCH in the format of SCI X transmitted by other UE, determines whether to further measure PSSCH-RSRP of a PSSCH scheduled by means of SCI X and whether to further demodulate the PSSCHscheduled by means of the SCI X according to the SCI X. The transmission and reception method further comprises the steps that a second type of UE detects the PSCCH in the format of SCI X transmittedby other UE, and determines a TBS of the PSSCH scheduled by means of SCI X according to a modulation coding bit field in the SCI X and a predefined TBS mapping norm. The transmission and reception method further comprises the steps that the second type of UE determines transmission power of the PSCCH in the format of SCI X and the PSSCH scheduled by means of the SCI X according to a modulation mode. By adopting the transmission and reception method, the coexistence of the first type of V2X UE and the second type of V 2X UE can be better realized, and the transmission efficiency of the second type of V 2X UE is improved.

Description

technical field [0001] The present application relates to the field of communication technology, specifically, the present invention relates to a method for sending and receiving sidelink control information SCI (Sidelink control information) carried on PSCCH in vehicle-to-external (V2X) communication, and a method for scheduling based on SCI. PSSCH measurement and demodulation method. Background technique [0002] In the 3GPP standard, the direct communication link between the device and the device is called a sidelink (Sidelink). Similar to the uplink and downlink, there are also control channels and data channels on the sidelink, and the former is called a sidelink control channel. (English full name: Physical Sidelink Control CHannel, English abbreviation: PSCCH), the latter is called a bypass data channel (English full name: Physical Sidelink Shared CHannel, English abbreviation: PSSCH). The PSCCH is used to indicate the time-frequency domain resource position of the P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/40H04W72/08H04W72/12H04W72/14
CPCH04W72/542H04W72/541H04W72/23
Inventor 王轶李迎阳张世昌
Owner BEIJING SAMSUNG TELECOM R&D CENT
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