Schemes for type0 pdcch
Patent Information
- Application Number
- PCT/CN2025/085110
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025085110_01102026_PF_FP_ABST
Abstract
Description
SCHEMES FOR TYPE0 PDCCHFIELD
[0001] This disclosure relates generally to wireless communications, and, more particularly, to methods and apparatus about procedures for schemes for configuration information for the PDCCH that indicates SIB1 (RMSI) .BACKGROUND
[0002] In communication systems, due to the limited information that can be carried in the MIB, important system messages are carried through SIB1. The MIB includes configuration information for the PDCCH that indicates SIB1 (RMSI) .
[0003] The patent proposes solutions for RMSI to reduce CORESET detection delay and blind detection complexity, and to simplify the indication and procedures to determine RMSI CORESET occasions.SUMMARY
[0004] In communication systems, considering the limited information that can be carried in the MIB (Master Information Block) , more important system messages are carried through SIB1 (System Information Block 1) . The MIB carries configuration information indicating the PDCCH (Physical Downlink Control Channel) for SIB1 (RMSI -Remaining Minimum System Information) . The patent proposes several solutions for RMSI, such as reducing RMSI CORESET detection delay and blind detection complexity and providing simplified indications and procedures to determine the RMSI CORESET occasions.
[0005] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives RMSI CORESET configuration. The UE determines the RMSI CORESET configuration based on the RMSI CORESET configuration.
[0006] To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 is a diagram illustrating an example of the RMSI CORESET detection delay for with TDM scenario and without TDM scenario.
[0008] Figure 2 is a diagram illustrating an example of the Relationship of RMSI CORESET and Beam_SSB (TDM wi FDM wo SDM) .
[0009] Figure 3 is a diagram illustrating an example of the Relationship of RMSI CORESET and Beam_SSB (TDM wi FDM and wi SDM) .
[0010] Figure 4 is a diagram illustrating an example of the procedure to Determine PDCCH monitoring occasions of option 1.
[0011] Figure 5 is a diagram illustrating an example of the procedure to Determine PDCCH monitoring occasions of option 2.
[0012] Figure 6 is a diagram illustrating an example of the procedure to Determine PDCCH monitoring occasions of option 3.DETAILED DESCRIPTION
[0013] The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
[0014] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0015] In communication systems, considering the limited information that can be carried in the Master Information Block (MIB) , more critical system messages are typically conveyed through the System Information Block 1 (SIB1) , also known as the Remaining Minimum System Information (RMSI) . The MIB includes configuration information that indicates the Physical Downlink Control Channel (PDCCH) settings for SIB1. This patent addresses several strategies for RMSI, aiming to achieve the following objectives: · Reduce RMSI CORESET Detection Delay and Blind Detection Complexity: the goal is to minimize the time and computational resources required for the User Equipment (UE) to detect the Control Resource Set (CORESET) associated with RMSI. By optimizing the detection process, the UE can quickly and efficiently locate the necessary control information, thereby improving overall system performance and user experience. · Simplified Indication and Procedures to Determine the RMSI CORESET Occasions: this involves streamlining the signaling and procedural steps that the UE must follow to identify the occasions when the RMSI CORESET is transmitted. Simplified indications can reduce the complexity of the UE's operations, making it easier and faster to determine when and where to look for RMSI CORESET. This can lead to more efficient use of network resources and quicker access to essential system information.
[0016] By implementing these strategies, the communication system can enhance the efficiency and reliability of delivering critical system information to the UE. This ensures that the UE can quickly synchronize with the network and access necessary configuration details, leading to improved connectivity and user satisfaction. More specifically, we propose to consider the following proposals:Proposal#1: Relationship of RMSI CORESET and Beam_SSB To Reduce RMSI CORESET detection delay and blind detection complexity, predefined or configured time domain offset between RMSI CORESET and Beam_SSB can be utilized, where the time domain resource for RMSI CORESET should be after the time domain resource utilized to transmit Beam_SSB. Besides, to improve flexibility of network for wideband and multi-beam systems, Optional FDM / SDM can be utilized as in Fig 2, 3. Minimize RMSI CORESET detection delay RMSI CORESET detection should be later than PBCH detection, where the time domain resource for RMSI CORESET for Beam #N should be after the time domain resource utilized to transmit Beam_SSB for Beam #M (M can be equal or not equal to N) one-to-one association between a Beam_SSB and an RMSI CORESET as in Fig. 1 without TDM: Beam_SSB periodicity + duration of RMSI CORESET + processing delay with TDM: duration of Beam_SSB + offset + duration of RMSI CORESET + processing delay with TDM is better to reduce RMSI CORESET detection delay Optional FDM / SDM Improve flexibility of network for wideband and multi-beam systems with multi-beam systems: the RMSI CORESET for Beam #N can be configured in the time and / or frequency domain resource that is utilized to transmit Beam_SSB for Beam #M (M≠N) with wideband systems: the RMSI CORESET for Beam #N can be configured in the frequency domain resource that is different from the frequency resource utilized to transmit Beam_SSB for Beam #M (M can be equal or not equal to N) .Proposal#2: RMSI CORESET (CORSET #0) start symbol indication CORSET #0 SFN and X , where X indicates the SFN offset between CORSET #0 (RMSI CORESET) and the SFN of start or the end of beam_SSB Option 1: same as Beam_SSB SFN (in case Beam_SSB span two SFN, CORSET #0 SFN is the start SFN of Beam_SSB Or the end of Beam_SSB) Option 2: X1 is the offset to the end of Beam_SSB SFN CORSET #0 Slot / Subframe and Y, where Y indicates the subframe / slot offset between CORSET #0 (RMSI CORESET) and the subframe / slot of start or the end of Beam_SSB Option 1: same as Beam_SSB Slot / Subframe (in case Beam_SSB span two Slots / Subframes, CORSET #0 Slot / Subframe is the start Slot / Subframe of Beam_SSB? Or the end Slot / Subframe of Beam_SSB? ) Option 2: Y1 is the offset to the end of SSB subunit #max Option 3: Y2 is the offset to each of SSB subunit CORSET #0 Symbol and Z, where Z indicates the symbol offset between CORSET #0 (RMSI CORESET) and the start or the end of Beam_SSB or Z indicates the start symbol index of CORSET #0 (RMSI CORESET) Option 1: Z1 is the offset to the end of SSB subunit #max Option 2: Z2 is the offset to each of SSB subunit NOTE: ·X1, Y1, Y2, Z1, Z2 can be predefined values or configured values or values can be calculated based on repetition number of Beam_SSB and / or Beam_SSB index ·Repetition number of CORSET #0 can be same repetition number of Beam_SSB or specific repetition factor multiply repetition number of Beam_SSB, where specific repetition factor can be predefined values or can be configured by MIB. ·Different multiplexing pattern number can have different combination of values for time domain offset to Beam_SSB ·Different Beam_SSB repetition can have different CORSET #0 (RMSI CORESET) position configuration table. ·Different Beam_SSB repetition and different BW and SCS of Beam_SSB can have different resource allocation for CORSET #0 (RMSI CORESET) table.Proposal 3---Option 1: Resource allocation and configuration of RMSI CORESET Step 1: UE does PSS blind search and PBCH decoding to obtain Beam_SSB SCS, repetition number of Beam_SSB and Resource allocation configuration index, search space configuration index in PDCCH-ConfigSIB1 and subCarrierSpacingCommon in MIB. Step 2: Determine Number of RBs of RMSI CORESET, Number of Symbols of RMSI CORESET based on Beam_SSB SCS, Resource allocation configuration index, subCarrierSpacingCommon Step 3: Determine RMSI CORESET search space configuration (including at least one of Frequency offset, Time offset, Repetition factor and configuration) based on repetition number of Beam_SSB , search space configuration index, Number of RBs of RMSI CORESET. Table 1: Resource allocation when SS SCS, CORESET SCS = 15, 15KHz Table 2: search space configuration when PRB and R=1 for Beam_SSB pdcch-ConfigSIB1 (6 / 7 / 8bits) in MIB Determines a common ControlResourceSet (CORESET) , a common search space and necessary PDCCH parameters. ·Resource allocation configuration index (3 / 4bits) , indicates the Number of RBs of RMSI CORESET, Number of Symbols for CORSET #0 (RMSI CORESET) , where different tables can be utilized for different combinations of Beam_SSB SCS SCS and RMSI CORESET SCS and / or different minimum channel bandwidth for the band of Beam_SSB. ·search space configuration index (2 / 3 / 4bits) , indicates the time domain offset between CORSET #0 (RMSI CORESET) and the start or the end of Beam_SSB, and the frequency domain offset between CORSET #0 (RMSI CORESET) and the start PRB of Beam_SSB, where different tables can be utilized for different Beam_SSB repetitions and / or different Number of RBs of RMSI CORESET, the Number of RBs of RMSI CORESET is obtained based on Resource allocation configuration index. With / without the repetition numbers of CORSET #0 (RMSI CORESET) = Repetition factor *Beam_SSB repetition NUMBER. With / without the repetition configuration of CORSET #0 (RMSI CORESET) to configure different repetition alternatives for CORSET #0 (RMSI CORESET) repetitions. subCarrierSpacingCommon 1bits Subcarrier spacing for SIB1, Msg. 2 / 4 and MsgB for initial access, paging and broadcast SI-messages. If the UE acquires this on a carrier frequency X, ·Case 1: if thr_1<X<thr_2, the value 0 corresponds to 15 kHz and the value 1 corresponds to 30 kHz; ·Case 2: if thr_3<X<thr_4, the value 0 corresponds to 30 kHz and the value 1 corresponds to 60 kHz; ·Case 3: if thr_5<X<thr_6, the value 0 corresponds to 60 kHz and the value 1 corresponds to 120 kHz; ·Case 4: if thr_7<X<thr_8, the value 0 corresponds to 30 kHz and the value 1 corresponds to 120 kHz; ·Case 5: if thr_9<X<thr_10, the value 0 corresponds to 120 kHz and the value 1 corresponds to 240 kHz; ·Case 6: if thr_11<X<thr_12, the value 0 corresponds to 240 kHz and the value 1 corresponds to 480 kHz. ·Case 7: For operation when thr_13<X<thr_14, the subcarrier spacing for SIB1, Msg. 2 / 4 and MsgB for initial access, paging and broadcast SI-messages is same as that for the corresponding SSB. Note: ·the thr_1, thr_2, thr_3, thr_4, thr_5, thr_6, thr_7, thr_8, thr_9, thr_10, thr_11, thr_12, thr_13, thr_14 are predefined values according to RAN4 operation bands settings. ·At least one of the cases in subCarrierSpacingCommon should be utilized.Proposal 3---Option 2: Resource allocation and configuration of RMSI CORESET Step 1: UE does PSS blind search and PBCH decoding to Obtain Beam_SSB SCS, repetition number of Beam_SSB and Obtain frequency configuration index , time configuration index in PDCCH-ConfigSIB1 and subCarrierSpacingCommon in MIB Step 2: Determine Number of RBs frequency offset based on Beam_SSB SCS, frequency configuration index , subCarrierSpacingCommon Step 3: Determine Number of Symbols RMSI CORESET position based on repetition number of Table 3: Frequency configuration when SS SCS, CORESET SCS = 15, 15KHz Table 4: Time configuration when PRB and R=1 for Beam_SSB pdcch-ConfigSIB1 (6 / 7 / 8bits) in MIB Determines a common ControlResourceSet (CORESET) , a common search space and necessary PDCCH parameters. ·Frequency configuration index (3 / 4bits) , indicates the Number of RBs for CORSET #0 (RMSI CORESET) and the frequency domain offset between CORSET #0 (RMSI CORESET) and the start PRB of Beam_SSB, where different tables can be utilized for different combinations of SS SCS and CORESET SCS and / or different minimum channel bandwidth for the band of Beam_SSB. ·Time configuration index (2 / 3 / 4bits) , indicates the time domain offset between CORSET #0 (RMSI CORESET) and the start or the end of Beam_SSB, and Number of Symbols for CORSET #0 (RMSI CORESET) , where different tables can be utilized for different beam_SSB repetitions and / or different Number of RBs for CORSET #0 (RMSI CORESET) , the Number of RBs for CORSET #0 (RMSI CORESET) is obtained based on Frequency configuration index . With / without the repetition numbers of CORSET #0 (RMSI CORESET) = Repetition factor *beam_SSB repetition. With / without the repetition configuration of CORSET #0 (RMSI CORESET) to configure different repetition alternatives for CORSET #0 (RMSI CORESET) repetitions. subCarrierSpacingCommon 1bits Subcarrier spacing for SIB1, Msg. 2 / 4 and MsgB for initial access, paging and broadcast SI-messages. If the UE acquires this on a carrier frequency X, ·Case 1: if thr_1<X<thr_2, the value 0 corresponds to 15 kHz and the value 1 corresponds to 30 kHz; ·Case 2: if thr_3<X<thr_4, the value 0 corresponds to 30 kHz and the value 1 corresponds to 60 kHz; ·Case 3: if thr_5<X<thr_6, the value 0 corresponds to 60 kHz and the value 1 corresponds to 120 kHz; ·Case 4: if thr_7<X<thr_8, the value 0 corresponds to 30 kHz and the value 1 corresponds to 120 kHz; ·Case 5: if thr_9<X<thr_10, the value 0 corresponds to 120 kHz and the value 1 corresponds to 240 kHz; ·Case 6: if thr_11<X<thr_12, the value 0 corresponds to 240 kHz and the value 1 corresponds to 480 kHz. ·Case 7: For operation when thr_13<X<thr_14, the subcarrier spacing for SIB1, Msg. 2 / 4 and MsgB for initial access, paging and broadcast SI-messages is same as that for the corresponding SSB. Note: ·the thr_1, thr_2, thr_3, thr_4, thr_5, thr_6, thr_7, thr_8, thr_9, thr_10, thr_11, thr_12, thr_13, thr_14 are predefined values according to RAN4 operation bands settings. ·At least one of the cases in subCarrierSpacingCommon should be utilized.Proposal 3---Option 3: Resource allocation and configuration of RMSI CORESET Step 1: UE does PSS blind search and PBCH decoding to Obtain Beam_SSB SCS and Band number based on the GSCN predefined, and Obtain Resource allocation configuration index , time configuration index in PDCCH-ConfigSIB1 and subCarrierSpacingCommon in MIB Step 2: Determine minimum UE channel bandwidth based on Band number and subCarrierSpacingCommon, and determine the Table number for Resource allocation configuration from candidate tables based on Beam_SSB SCS, Resource allocation configuration index , subCarrierSpacingCommon, minimum UE channel bandwidth Step 3: Determine Resource allocation and time configuration based on Resource allocation configuration index , time configuration index, ) , the Number of RBs for CORSET #0 Table 5: Resource allocation when SS SCS, CORESET SCS = 15, 15KHz and with minimum channel bandwidth 1.4MHz or 3 MHz and channel bandwidth 1.4MHz or 3 MHz or 5 MHz Table 6: Time configuration when PRB and R=1 for Beam_SSB pdcch-ConfigSIB1 (6 / 7 / 8bits) in MIB Determines a common ControlResourceSet (CORESET) , a common search space and necessary PDCCH parameters. ·Resource allocation configuration index (3 / 4bits) , indicates the Number of RBs and Number of Symbols for CORSET #0 (RMSI CORESET) and the frequency domain offset between CORSET #0 (RMSI CORESET) and the start PRB of Beam_SSB, where different tables can be utilized for different combinations of SS SCS and CORESET SCS and / or different minimum channel bandwidth for the band of Beam_SSB. ·time configuration index (2 / 3 / 4bits) , indicates the time domain offset between CORSET #0 (RMSI CORESET) and the start or the end of Beam_SSB, where different tables can be utilized for different beam_SSB repetitions and / or different Number of RBs for CORSET #0 (RMSI CORESET) , the Number of RBs for CORSET #0 (RMSI CORESET) is obtained based on Resource allocation configuration index. With / without the repetition numbers of CORSET #0 (RMSI CORESET) = Repetition factor *beam_SSB repetition. With / without the repetition configuration of CORSET #0 (RMSI CORESET) to configure different repetition alternatives for CORSET #0 (RMSI CORESET) repetitions. subCarrierSpacingCommon 1bits Subcarrier spacing for SIB1, Msg. 2 / 4 and MsgB for initial access, paging and broadcast SI-messages. If the UE acquires this on a carrier frequency X, ·Case 1: if thr_1<X<thr_2, the value 0 corresponds to 15 kHz and the value 1 corresponds to 30 kHz; ·Case 2: if thr_3<X<thr_4, the value 0 corresponds to 30 kHz and the value 1 corresponds to 60 kHz; ·Case 3: if thr_5<X<thr_6, the value 0 corresponds to 60 kHz and the value 1 corresponds to 120 kHz; ·Case 4: if thr_7<X<thr_8, the value 0 corresponds to 30 kHz and the value 1 corresponds to 120 kHz; ·Case 5: if thr_9<X<thr_10, the value 0 corresponds to 120 kHz and the value 1 corresponds to 240 kHz; ·Case 6: if thr_11<X<thr_12, the value 0 corresponds to 240 kHz and the value 1 corresponds to 480 kHz. ·Case 7: For operation when thr_13<X<thr_14, the subcarrier spacing for SIB1, Msg. 2 / 4 and MsgB for initial access, paging and broadcast SI-messages is same as that for the corresponding SSB. Note: ·the thr_1, thr_2, thr_3, thr_4, thr_5, thr_6, thr_7, thr_8, thr_9, thr_10, thr_11, thr_12, thr_13, thr_14 are predefined values according to RAN4 operation bands settings. ·At least one of the cases in subCarrierSpacingCommon should be utilized.Proposal 4: new reference signal for PDCCH Utilize Z4 or ZC or m sequence as the reference signal for PDCCH, different root or cyclic shift or different sign (-1 / +1) of the sequence can be utilized to transmits part of payload information and to Reduce DCI payload size in the PDCCH data parts
[0017] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” The word “exemplary” is used herein to mean “serving as an example, instance, or illustration. ” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and / or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ”
Claims
1.A method comprising a RMSI CORESET configuration to reduce RMSI CORESET detection delay and blind detection complexity.2.The method of Claim 1, wherein the time domain resource for RMSI CORESET should be after the time domain resource utilized to transmit Beam_SSB.3.The method of Claim 1, wherein to improve flexibility of network for wideband and multi-beam systems, Optional FDM / SDM can be utilized.4.The method of Claim 2, wherein for CORSET #0 SFN, X cab be utilized to indicate the SFN offset between CORSET #0 (RMSI CORESET) and the SFN of start or the end of beam_SSB:Option 1: same as Beam_SSB SFN (in case Beam_SSB span two SFN, CORSET #0 SFN is the start SFN of Beam_SSB Or the end of Beam_SSB) , andOption 2: X1 is the offset to the end of Beam_SSB SFN.5.The method of Claim 2, wherein for CORSET #0 Slot / Subframe, Y can be utilized to indicate the subframe / slot offset between CORSET #0 (RMSI CORESET) and the subframe / slot of start or the end of Beam_SSB:Option 1: same as Beam_SSB Slot / Subframe (in case Beam_SSB span two Slots / Subframes, CORSET #0 Slot / Subframe is the start Slot / Subframe of Beam_SSB? Or the end Slot / Subframe of Beam_SSB) ;Option 2: Y1 is the offset to the end of SSB subunit #max; andOption 3: Y2 is the offset to each of SSB subunit.6.The method of Claim 2, wherein for CORSET #0 Symbol, Z can be utilized to indicate the symbol offset between CORSET #0 (RMSI CORESET) and the start or the end of Beam_SSB or Z indicates the start symbol index of CORSET #0 (RMSI CORESET) :Option 1: Z1 is the offset to the end of SSB subunit #max, andOption 2: Z2 is the offset to each of SSB subunit Flexible CP configuration can be configured with MIB / SIB / RRC / MAC CE / DCI.7.The method of Claim 1, wherein the following step can be utilized for RMSI CORESET resource allocation:Step 1: UE does PSS blind search and PBCH decoding to obtain Beam_SSB SCS, repetition number of Beam_SSB and Resource allocation configuration index, search space configuration index in PDCCH-ConfigSIB1 and subCarrierSpacingCommon in MIB;Step 2: Determine Number of RBsof RMSI CORESET, Number of Symbolsof RMSI CORESET based on Beam_SSB SCS, Resource allocation configuration index, subCarrierSpacingCommon; andStep 3: Determine RMSI CORESET search space configuration (including at least one of Frequency offset, Time offset, Repetition factor and configuration) based on repetition number of Beam_SSB , search space configuration index, Number of RBsof RMSI CORESET.8.The method of Claim 1, wherein the following step can be utilized for RMSI CORESET resource allocation:Step 1: UE does PSS blind search and PBCH decoding to Obtain Beam_SSB SCS, repetition number of Beam_SSB and Obtain frequency configuration index , time configuration index in PDCCH-ConfigSIB1 and subCarrierSpacingCommon in MIB;Step 2: Determine Number of RBsfrequency offset based on Beam_SSB SCS, frequency configuration index , subCarrierSpacingCommon; andStep 3: Determine Number of SymbolsRMSI CORESET position based on repetition number of Beam_SSB , time configuration index in PDCCH-ConfigSIB1, Number of RBs9.The method of Claim 1, wherein for one transmission, there can be one or more sets for aggregated CP configuration within one repetition for the transmission.10.A method comprising Utilizing Z4 or ZC or m sequence as the reference signal for PDCCH, different root or cyclic shift or different sign (-1 / +1) of the sequence can be utilized to transmits part of payload information and to Reduce DCI payload size in the PDCCH data parts.