SIB transmission indication method, user equipment and base station

Abstract

The invention provides an SIB transmission indication method, user equipment (UE) and a base station, the UE searches a synchronization signal and a physical broadcast channel block (SSB) when accessing a network, selects the SSB of the strongest cell, decodes the physical broadcast channel block (PBCH for short) in the SSB, and transmits the decoded PBCH to the base station. Wherein a physical downlink control channel SIB1 configuration information (PDCCH-Config SIB1) field indicates that a terminal receives the SIB1 in a specific time-frequency domain, and the specific time domain position of the SIB1 is determined by a Search Space Zero, the invention aims to provide an SIB1 transmission indication method, the time domain position of the terminal for searching the SIB1 is adjusted by searching a new field of a Search Space Offset, and the purpose is to adjust the time domain position of the terminal for searching the SIB1 in the Search Space Offset when the Search Space Offset is kept in the Search Space Offset. On the premise that the MIB has the characteristic of simplicity, the time domain position for placing the SIB1 is more flexible, and the method is suitable for more scenes.

Description

Technical Field

[0001] The present application belongs to the technical field of Mesh products, and in particular to a SIB transmission indication method, user equipment and base station. Background Art

[0002] After receiving the SSB, the UE will calculate the time domain position of detecting SIB1 based on the currently received SSB index. For bandwidth without shared spectrum channel access and SSB and control resource set (Control Resource Set, referred to as CORESET) multiplexing mode 1, the UE will 0 The PDCCH in the Type-PDCCH CSS set is monitored in two consecutive slots starting from the first slot.

[0003] For the starting position n 0 , 3GPP protocol definition:

[0004]

[0005] Among them, O and M are the offsets of the starting slot, which are obtained according to the SearchSpaceZero configuration (Appendix Table 13-11, Table 13-12);

[0006] μ∈{0,1,2,3} is based on the subcarrier spacing of the Physical Downlink Control Channel (PDCCH) received at the CORESET; i is the index of the current SSB detected; The subcarrier spacing in a system frame is 2 μ The number of slots, such as when μ = 3,

[0007] According to the above formula, the starting position n is calculated 0 After that, it is necessary to determine whether to detect the starting position n0 of the even frame or the odd frame through the following judgment.

[0008] when SFN C Need to meet SFN C mod2=0(even frame)

[0009] when SFN C Need to meet SFN C mod2=1(odd frame)

[0010] like Figure 1As shown in Table 1 and Table 2. After receiving the SSB, the UE calculates the time domain position for detecting SIB1 according to the currently received SSB index. According to the above formula for detecting the starting position of SIB1, the starting position n 0 It is mainly determined by O, M, and SSBindex. O and M are obtained by configuring SearchSpaceZero mapping, and SSB index is indicated by adding additional coded information bits during PBCH physical layer processing. However, due to the small number of bits used, there are few selectable positions in the time domain for SSB corresponding to SIB1, and flexible configuration is not possible, resulting in restrictions on the implementation of some scenarios, such as millimeter wave multi-beam scenarios.

[0011] For millimeter-wave multi-beam scenarios, SSB cannot be sent in the uplink time slot due to different frame structure configurations. The frame structure configuration in the following example is DDDSUDDDSU, the subcarrier spacing is 120kHz, and the inOneGroup configuration is 00111111. For this configuration, since SIB1 cannot be sent down in the uplink time slot, the base station side needs to skip the uplink time slot when designing the solution. And because the 3GPP protocol stipulates that the UE can monitor the PDCCH in two consecutive time slots starting from the calculated time domain starting position, the base station side can shift the downlink SIB1 by one time slot, but this cannot guarantee that each time slot corresponds to only one SIB1, as shown in the red part. Therefore, the millimeter-wave multi-beam scenario is restricted. The specific implementation restrictions are as follows: Figure 2 shown. Summary of the invention

[0012] In response to the technical problems raised by the background technology, the present invention proposes a SIB transmission indication method, user equipment and base station. After the UE searches for the SSB, the UE will calculate the starting time domain position of the UE search for SIB1 according to the SearchSpaceZero configured by the high-level and the SSB index corresponding to the SSB. However, since the starting time domain position has only two configurable parameters, SearchSpaceZero and SSBindex, the time domain position of the SSB and its corresponding SIB1 will be greatly limited, which is not conducive to the subsequent adaptation of different NR usage scenarios. It aims to enhance the configurability and flexibility of the starting position of the SIB1 time domain. In the first aspect, the present application provides a SIB transmission indication method, which specifically includes the following steps:

[0013] After determining the SIB1 corresponding to the SSB index, the base station can offset the time domain position of SIB1 according to different application scenarios, and send the high-level configuration to the UE. The specific method is as follows:

[0014] Step 1: After the UE is turned on, it scans the frequency on the receiving antenna according to the synchronization grid to search for SSB;

[0015] Step 2: After searching for the SSB, select the SSB of the strongest cell for access;

[0016] Step 3: Decode the physical broadcast channel in the SSB, including the SearchSpaceZero field in PDCCH-SIB1; Step 4: The UE calculates the time domain position indicating the UE to search SIB1 through a formula based on the searched SSB index and the SearchSpaceZero field;

[0017] Step 5: The UE performs a time domain offset on the time domain position of the UE receiving SIB1 calculated in step 4 according to the SearchSpaceOffset field configured by the high-level signaling on the base station side, and the UE monitors the physical downlink control channel for two consecutive time slots at the calculated final time domain position;

[0018] Step 6: The base station side calculates and sends SIB1 in a specific time domain according to the SSB index, SearchSpaceZero and SearchSpaceOffset fields configured by the high-level signaling, thereby ensuring consistency with the UE.

[0019] Preferably, the UE obtains the values ​​of O and M according to the value mapping of SearchSpaceZero, the value of i is the index corresponding to the SSB, and Search Space Offset is a parameter configured by the cell high layer;

[0020]

[0021] In a second aspect, the present application further provides a user equipment, comprising the method described in the first aspect.

[0022] In a third aspect, the present application also provides a base station, including the method as described in the first aspect.

[0023] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0024] 1) A method for optimizing the calculation of the time domain position of SSB and its corresponding SIB1. When the UE searches for SSB when entering the network, it decodes to obtain Search Space Zero. The Search Space Zero field and SSB index are calculated using the formula defined by the 3GPP protocol to obtain the time domain position of the UE searching for SIB1 in two specific consecutive time slots. Finally, this patent proposes a new field Search Space Offset to adjust the time domain position of searching SIB1 to achieve time synchronization between the UE and the base station. By adjusting the time domain position of the base station transmitting SIB1 through the SearchSpaceOffset field, the base station can more flexibly adjust the transmit beam in the millimeter wave multi-beam scenario.

[0025] 2) The SIB1 transmission indication method adjusts the time domain position of the terminal searching for SIB1 by adding a new field called Search Space Offset. Under the premise of keeping the simplicity of the Master Information Block (MIB), the time domain position of SIB1 placement can be made more flexible and applicable to more scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a flow chart of UE accessing the network and monitoring SIB1 provided in Example 1 of the present application;

[0028] Figure 2 It is a timing diagram of the association relationship between SSB and SIB1 in a millimeter wave multi-beam scenario provided by the background technology of this application;

[0029] Figure 3 This is a timing diagram of the Search Space Offset implementation provided in Example 2 of the present application;

[0030] Figure 4 This is the beam adaptation characteristic SIB1 and Search Space Offset timing diagram provided in Example 3 of the present application. DETAILED DESCRIPTION

[0031] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0032] Embodiment 1: Adjustment of the time domain position for searching SIB1 on the UE side

[0033] After the UE searches for the SSB when entering the network, it decodes the SSB of the strongest cell and obtains the time domain location field SearchSpaceZero indicating the reception of SIB1. Then, the specific time domain location n of the SIB1 sent by the receiving base station is calculated based on the SSB index and SearchSpaceZero. 0 , UE in n 0 The UE monitors SIB1 in two consecutive time slots after the time slot. If the SearchSpaceOffset configured by the higher layer is received during this process, the UE needs to calculate the n 0 An offset is performed to achieve synchronization with the SIB1 time domain position sent down by the base station side, thereby realizing monitoring of SIB1.

[0034] Step 1: UE accesses the network and searches for SSB, and decodes it to obtain Search Space Zero;

[0035] Step 2: The UE obtains the values ​​of O and M according to the value mapping of Search Space Zero. The value of i is the index corresponding to the SSB, and Search Space Offset is a parameter configured by the cell high layer.

[0036]

[0037] Step 3: UE calculates n 0 After calculating the result n 0 The SIB1 sent by the base station is monitored in two consecutive time slots in the time slot.

[0038] Embodiment 2: The base station side adjusts the SIB1 time domain position by configuring and sending the SIB1 offset value

[0039] Assuming that in a multi-beam scenario, the base station can send a maximum of 48 beams, the subcarrier spacing is 120kHz, and the frame structure is DDDSUDDDSU. The base station calculates the time domain position where SIB1 needs to be transmitted based on the transmitted SSB index and the configured Search Space Zero. Finally, by configuring the sending SIB1 offset value Search Space Offset, the time domain position of SIB1 transmission is adjusted according to the base station's beam transmission strategy, so that in the millimeter wave multi-beam scenario, the transmission direction of the SIB1 beam can be allocated and adjusted according to the transmission direction of different SSB beams. The specific schematic diagram is shown below, where the yellow square represents the SIB1 corresponding to the SSBindex, and the blue square represents the sending SIB1 offset value SearchSpaceOffset that needs to be configured for the time domain position of the sent SIB1. Figure 3 shown.

[0040] Embodiment 3: Placing a time slot with adaptively adjustable beam direction between different time slots for transmitting SIB1

[0041] Assuming that in a multi-beam scenario, the base station can send a maximum of 32 beams, the subcarrier spacing is 120kHz, and the frame structure is DDDSUDDDSU. The base station side adjusts the time domain position of the transmitted SIB1 by configuring SearchSpaceOffset, so that there is at least one time slot between the transmission of SIB1. The role of this interval time slot is to make the time slot a beam adaptive time slot, which can be adaptively adjusted according to the direction of other accessed terminals. Even if the base station occupies certain time domain positions due to SIB1, there can be beam adaptive time slots between the transmission of SIB1 to quickly respond to UE services. The specific schematic diagram is shown below. There is at least one time slot between all SIB1s transmitted by the base station, and the transmitted SIB1s are placed in special time slots as much as possible. Figure 4 shown.

[0042] MIB: Master Information Block;

[0043] SIB1: System Information Block 1 System Information Block 1;

[0044] UE:User Equipment;

[0045] SSB: SS / PBCH block synchronization signal and physical broadcast channel block;

[0046] CORESET: Control Resource Set;

[0047] PDCCH: Physical Downlink Control Channel physical downlink control channel.

[0048] Table 1: PDCCH monitoring opportunity parameters for Type 0-PDCCH CSS set - SS / PBCH block and CORESET multiplexing mode 1 and FR1

[0049]

[0050] Table 2: PDCCH monitoring opportunity parameters for Type 0-PDCCH CSS set - SS / PBCH block and CORESET multiplexing mode 1 and FR2

[0051]

[0052] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0053] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A SIB transmission indication method, characterized in that: The specific steps include: After determining the SIB1 corresponding to the SSB index, the base station can offset the time domain position of SIB1 according to different application scenarios, and send the high-level configuration to the UE. The specific method is as follows: Step 1: After the UE is turned on, it scans the frequency on the receiving antenna according to the synchronization grid to search for SSB; Step 2: After searching for the SSB, select the SSB of the strongest cell for access; Step 3: Decode the physical broadcast channel in the SSB, including the SearchSpaceZero field in PDCCH-SIB1; Step 4: The UE calculates the time domain position indicating the UE to search SIB1 according to the searched SSB index and the SearchSpaceZero field through a formula; Step 5: The UE performs a time domain offset on the time domain position of the UE receiving SIB1 calculated in step 4 according to the SearchSpaceOffset field configured by the high-level signaling on the base station side, and the UE monitors the physical downlink control channel for two consecutive time slots at the calculated final time domain position; Step 6: The base station side calculates and sends SIB1 in a specific time domain according to the SSB index, SearchSpaceZero and SearchSpaceOffset fields configured by the high-level signaling, thereby ensuring consistency with the UE.

2. A SIB transmission indication method according to claim 1, characterized in that: The UE obtains the values ​​of O and M according to the value mapping of SearchSpaceZero. The value of i is the index corresponding to the SSB, and SearchSpaceOffset is a parameter configured by the cell high layer.

3. A user equipment, characterized in that It includes a SIB transmission indication method as claimed in claim 1.

4. A base station, characterized in that It includes a SIB transmission indication method as claimed in claim 1.

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