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EP-4064762-B1 - DISCOVERY BURST TRANSMISSION WINDOW DESIGN

EP4064762B1EP 4064762 B1EP4064762 B1EP 4064762B1EP-4064762-B1

Inventors

  • HU, LIANG
  • BAE, JUNG HYUN
  • CHENG, Yuan-sheng
  • SARTORI, Philippe Jean Marc Michel

Dates

Publication Date
20260506
Application Date
20220317

Claims (11)

  1. A method, comprising: receiving, by a User Equipment, UE (905), a first Signal Synchronization Block, SSB; decoding a first Physical Broadcast Channel, PBCH (115) from the first SSB; determining, from a Master Information Block, MIB, of the first PBCH, a first beam value, where a beam value is a maximum value of a number of SSBs in an SSB burst set; determining, from the first PBCH, a first candidate Synchronization Signal/Physical Broadcast Channel, SS/PBCH, block index; calculating a first SS/PBCH block index as A mod Q, wherein A is the first candidate SS/PBCH block index and Q is the first beam value; receiving, by the UE (905), a second SSB; decoding a second PBCH from the second SSB; determining, from a MIB of the second PBCH, a second beam value; and determining, from the second beam value, whether a discovery burst transmission window, DBTW, is being employed.
  2. The method of claim 1, comprising: determining that the second beam value is equal to a predetermined value, and determining, based on the second beam value being equal to the predetermined value, that a DBTW is not being employed.
  3. The method of claim 1, comprising: determining that the second beam value is not equal to a predetermined value, determining, based on the second beam value not being equal to the predetermined value, that a DBTW is being employed, and determining, from the second beam value, a number of beams in the DBTW.
  4. The method of any one of claims 1 to 3, further comprising obtaining system information, wherein the obtaining is performed based on the determination of whether a DBTW is being employed.
  5. The method of any one of claims 1 to 4, further comprising: determining, from the second PBCH, a second candidate SS/PBCH block index; and determining a second SS/PBCH block index, based on the second candidate SS/PBCH block index and based on the second beam value.
  6. The method of claim 5, wherein the determining of the second SS/PBCH block index comprises inferring the second SS/PBCH block index based on the order of candidate SS/PBCH block index values being reversed within a second DBTW, the second DBTW being associated with, and following, a first DBTW.
  7. The method of any one of claims 1 to 6, further comprising receiving a DBTW-identifying bit associated with the first SSB, the DBTW-identifying bit specifying whether the first SSB is within a first DBTW or a second DBTW of two associated DBTWs.
  8. The method of claim 7, wherein the DBTW-identifying bit is a bit of the MIB.
  9. The method of claim 7, wherein the DBTW-identifying bit is subCarrierSpacingCommon.
  10. The method of any one of claims 1 to 9, wherein: the first beam value is greater than 32, and the method comprises: receiving a first plurality of SSBs in a first DBTW; and receiving a second plurality of SSBs in a second DBTW.
  11. A User Equipment, UE (905), comprising: a radio (915); and a processing circuit (920), the processing circuit (920) being configured to perform the method according to any one of claims 1 to 10.

Description

FIELD One or more aspects of embodiments according to the present disclosure relate to wireless communication, and more particularly to a system and method for managing a Discovery Burst Transmission Window in a wireless communication system. BACKGROUND In some regions, Listen Before Talk is mandated in unlicensed portions of the radio spectrum. When Listen Before Talk is required, a network node (gNB) may forego transmitting one or more Signal Synchronization Blocks (SSBs) in complying with Listen Before Talk. In such a situation, the gNB may employ a Discovery Burst Transmission Window (DBTW), within which the foregone SSBs may be transmitted later. A User Equipment UE may then receive one or more of such later-transmitted SSBs. It is with respect to this general technical environment that aspects of the present disclosure are related. "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for control (Release 16)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 38.213, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE: 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, vol. RAN WG1, no. V16.4.0 8 January 2021 (2021-01-08), pages 1-181, XP051999687 discusses physical layer procedures for control. SUMMARY Embodiments of the present invention are set out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS In the following the embodiments of the invention are disclosed in parts of the description relating to Figs. 2-4, 19 and 20, while the other embodiments/examples of the disclosure are provided for illustrative purposes to support a better understanding of the invention. These and other features and advantages of the present disclosure will be appreciated and understood with reference to the specification, claims, and appended drawings wherein: FIG. 1 is a resource diagram for a Signal Synchronization Block (SSB);FIG. 2 is an illustration of an SSB burst set structure, according to an embodiment of the present disclosure;FIG. 3 is an illustration of a Discovery Burst Transmission Window (DBTW), according to an embodiment of the present disclosure;FIG. 4 is a flowchart, according to an embodiment of the present disclosure;FIG. 5 is a DBTW timing diagram;FIG. 6 is a table of NSSBQCL;FIG. 7 is a DBTW timing diagram;FIG. 8 is a DBTW timing diagram;FIG. 9 is a DBTW timing diagram;FIG. 10 is a DBTW timing diagram;FIG. 11 is a DBTW timing diagram;FIG. 12 is a DBTW timing diagram;FIG. 13 is a DBTW timing diagram;FIG. 14 is a table of Global Synchronization Channel Number (GSCN);FIG. 15 is a table of Global Synchronization Channel Number (GSCN);FIG. 16 is a flow chart;FIG. 17 is a table of options for defining UE capability;FIG. 18 is a table of System Information Block 2 (SIB2) parameters;FIG. 19 is a flowchart, according to an embodiment of the present disclosure; andFIG. 20 is a block diagram of a system for wireless communications, according to an embodiment of the present disclosure. DETAILED DESCRIPTION The detailed description set forth below in connection with the appended drawings is intended as a description of exemplary embodiments of a system and method for managing a Discovery Burst Transmission Window in a wireless communication system provided in accordance with the present disclosure and is not intended to represent the only forms in which the present disclosure may be constructed or utilized. The description sets forth the features of the present disclosure in connection with the illustrated embodiments. As denoted elsewhere herein, like element numbers are intended to indicate like elements or features. When a New Radio-Unlicensed (NR-U) User Equipment (UE) operates in the 5/6 GHz band, it knows that the access is always unlicensed. For the band at 52 GHz (B52 GHz), the situation is not as simple, and it may be advantageous for the UE to determine whether it is a licensed or shared carrier. When operating in a licensed band, or in an unlicensed band without listen before talk (LBT), the Discovery Burst Transmission Window (DBTW) may be disabled. Also, it may be advantageous to define the UE behavior and the assumptions the UE may make regarding the window before the UE knows whether it is operating in a licensed or unlicensed part or whether LBT is on or off in regions where LBT is not mandated. A User Equipment (UE) may be a user device, such as a mobile telephone, a WiFi hotspot, or a laptop computer equipped with a mobile broadband adapter. FIG. 1 shows the structure of a Synchronization Signal Block (SSB, or SS block), in some embodiments. In the licensed portions of the spectrum, synchronization and initial access are based on the definition of the SS block. The SSB is a self-contained block that enables the UE to acquire synchronization and initial information. The SSB contains the following: (i) a Primary Synchronization Signal (PSS) 105, which is used to coarsely synchronize in frequency