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EP-3925360-B1 - METHOD AND APPARATUS FOR COMMUNICATING TWO STAGE SIDELINK CONTROL INFORMATION

EP3925360B1EP 3925360 B1EP3925360 B1EP 3925360B1EP-3925360-B1

Inventors

  • GANESAN, KARTHIKEYAN
  • BASU MALLICK, PRATEEK
  • Löhr, Joachim
  • GOLITSCHEK EDLER VON ELBWART, ALEXANDER JOHANN MARIA
  • NANGIA, VIJAY

Dates

Publication Date
20260506
Application Date
20200208

Claims (15)

  1. A method (1400) comprising: determining (1410), at a user equipment, UE, first stage sidelink control information, SCI, the first stage SCI including information indicating whether or not a second stage SCI is being transmitted; periodically transmitting (1420), by the UE, the first stage SCI; determining (1430) the second stage SCI; and transmitting (1440) the second stage SCI, characterized by that the second stage SCI is transmitted less often than the first stage SCI.
  2. The method (1400) according to claim 1, wherein the information in the first stage SCI indicates a periodicity of the second stage SCI.
  3. The method (1400) according to claim 1, wherein the information in the first stage SCI comprises a presence indicator bit that indicates at least one selected from whether or not the second stage SCI is being transmitted and whether or not to decode the second stage SCI by at least one receiving UE.
  4. The method (1400) according to claim 1, wherein the information in the first stage SCI comprises an invalid resource assignment, where the invalid resource assignment indicates the second stage SCI is not being transmitted.
  5. The method (1400) according to claim 1, further comprising receiving a negative acknowledgement in a sidelink feedback channel when a receiving device does not decode the second stage SCI.
  6. The method (1400) according to claim 1, further comprising reusing second stage SCI time-frequency resources for data transmission when the second stage SCI is not being transmitted on the second stage SCI time-frequency resources.
  7. An apparatus (1600) for wireless communication, comprising: at least one memory (1650); and at least one processor (1620) coupled with the at least one memory (1650) and configured to cause the apparatus (1600) to: determine first stage sidelink control information, SCI, the first stage SCI including information indicating whether or not a second stage SCI is being transmitted, and determine the second stage SCI; and periodically transmit the first stage SCI, and transmit the second stage SCI; characterized by that the second stage SCI is transmitted less often than the first stage SCI.
  8. The apparatus (1600) according to claim 7, wherein the information in the first stage SCI indicates the periodicity of the second stage SCI.
  9. The apparatus (1600) according to claim 7, wherein the information in the first stage SCI comprises a presence indicator bit that indicates at least one selected from whether or not the second stage SCI is being transmitted and whether or not the second stage SCI should be decoded by at least one receiving UE.
  10. The apparatus (1600) according to claim 7, wherein the information in the first stage SCI comprises an invalid resource assignment, where the invalid resource assignment indicates the second stage SCI is not being transmitted.
  11. The apparatus (1600) according to claim 7, wherein the at least one processor (1620) is further configured to cause the apparatus (1600) to reuse time-frequency resources allocated for second stage SCI for data transmission when the second stage SCI is not being transmitted on the second stage SCI time-frequency resources.
  12. The apparatus (1600) according to claim 7, wherein the second stage SCI comprises first second stage SCI, wherein the at least one processor (1620) is further configured to cause the apparatus (1600) to: receive a request to transmit updated scheduling information; and transmit updated scheduling information in a second second stage SCI in response to receiving the request to transmit updated scheduling information.
  13. The apparatus according to claim 7, wherein the first stage SCI includes a modification period of the second stage SCI, and wherein the at least one processor (1620) is further configured to cause the apparatus (1600) to transmit data on a physical sidelink shared channel based on the second stage SCI until the modification period expires.
  14. The apparatus according to claim 7, wherein the at least one processor (1620) is further configured to cause the apparatus (1600) to: periodically transmit the first stage SCI by groupcasting the first stage SCI to a group of UEs, receive a communication from a UE that is new to the group of UEs after transmitting the second stage SCI, and retransmit the second stage SCI in response to receiving the communication.
  15. A processor for wireless communication, comprising: at least one controller coupled with at least one memory and configured to cause the processor to: determine (1410) first stage sidelink control information, SCI, the first stage SCI including information indicating whether or not a second stage SCI is being transmitted; periodically transmit (1420) the first stage SCI; determine (1430) the second stage SCI; transmit (1440) the second stage SCI; and characterized by that the second stage SCI is transmitted less often than the first stage SCI.

Description

BACKGROUND 1. Field The present disclosure is directed to a method and apparatus for communicating two stage Sidelink Control Information (SCI). In particular, there is described herein an apparatus, a method and a processor. 2. Introduction Presently, wireless communication devices, such as User Equipment (UE), communicate with other communication devices using wireless signals. Control channel structure and procedure enhancement can be used in New Radio (NR) Vehicle to Everything (V2x) to support different SCI formats and different aggregation levels and still maintain the same decoding complexity as that of Long Term Evolution (LTE) V2x. In LTE Vehicle-to-everything (V2x), Physical Sidelink Control Channel (PSCCH) is defined to carry a Scheduling Assignment (SA), which is required by UE to properly detect and decode the corresponding Physical Sidelink Shared Channel (PSSCH). For example, Sidelink Control Information (SCI) is transmitted over the PSCCH, which carries the information related to the transmission of data over the PSSCH. R1-1813648 is a 3GPP discussion document titled "On 2-stage PSCCH design" submitted by Ericsson at TSG-RAN WG1 Meeting #95 in Spokane, WA, USA on 12 November 2018 and describes details related to the PSCCH which mainly carries scheduling related control information. R1-1813226 is a 3GPP discussion document titled "On Physical Layer Structure Design" submitted by InterDigital Inc. also at TSG-RAN WG1 Meeting #95 in Spokane, WA, USA on 12 November 2018 and describes multiple aspects of physical layer structures design, including waveform, RS design, PSCCH and associated PSSCH multiplexing, resource pool and BWP. SUMMARY The invention is defined by the appended claims. Claim 1 defines a method, claim 7 defines an apparatus, and claim 15 defines a processor. In the following, any method and/or apparatus referred to as embodiments but nevertheless do not fall within the scope of the appended claims are to be understood as examples helpful in understanding the invention. BRIEF DESCRIPTION OF THE DRAWINGS In order to describe the manner in which advantages and features of the disclosure can be obtained, a description of the disclosure is rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. These drawings depict only example embodiments of the disclosure and are not therefore to be considered to be limiting of its scope. The drawings may have been simplified for clarity and are not necessarily drawn to scale. FIG. 1 is an example block diagram of a system according to a possible embodiment;FIG. 2 is an example component illustration of two stage SCI according to a possible embodiment;FIG. 3 is an example illustration of sidelink Radio Resource Control (RRC) configuration according to a possible embodiment;FIG. 4 is an example illustration of two stage SCI with scheduling in the same Transmit Time Interval (TTI) according to a possible embodiment;FIG. 5 is an example illustration of two stage SCI with scheduling in different Bandwidth Parts (BWPs) according to a possible embodiment;FIG. 6 is an example illustration of two stage SCI with scheduling in different numerology according to a possible embodiment;FIG. 7 is an example illustration of two stage SCI where the first stage indicates the presence or absence of the second stage according to a possible embodiment;FIG. 8 is an example illustration of a transmitting UE in the first stage specifying the modification periodicity of the second stage SCI according to a possible embodiment;FIG. 9 is an example illustration of a receiving UE explicitly requesting a transmitting UE to send the second stage SCI according to a possible embodiment;FIG. 10 is an example illustration of a UE joining a group using groupcast transmission according to a possible embodiment;FIG. 11 is an example illustration of a new UE announcing itself to a group according to a possible embodiment;FIG. 12 is an example illustration of discovery and second stage SCI transmission for a group according to a possible embodiment;FIG. 13 is an example illustration of group specific signaling according to a possible embodiment;FIG. 14 is an example flowchart outlining the operation of a wireless communication device according to a possible embodiment;FIG. 15 is an example flowchart outlining operation of a wireless communication device according to a possible embodiment; andFIG. 16 is an example block diagram of an apparatus according to a possible embodiment. DETAILED DESCRIPTION According to a possible embodiment, first stage SCI can be determined. The first stage SCI can include information indicating whether or not a second stage SCI is being transmitted. The first stage SCI can be periodically transmitted. The second stage SCI can be determined. The second stage SCI can be transmitted. At least some embodiments can provide a procedure for multi-stage SCI design for NR V2x. At least some embodiments can provide informati