CN110474729B - Method and device for sending and receiving synchronization signal block group in unlicensed spectrum, storage medium, base station and user equipment - Google Patents
Method and device for sending and receiving synchronization signal block group in unlicensed spectrum, storage medium, base station and user equipment Download PDFInfo
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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Abstract
A method and device for sending and receiving a synchronization signal block group in an unlicensed spectrum, a storage medium, a base station and user equipment are provided, wherein the sending method comprises the following steps: monitoring before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window, wherein the sending window comprises a plurality of inter-group positions, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is at least the time length occupied by the synchronization signal block group; if the monitored channel is in an idle state, sending a synchronization signal block group at an inter-group position corresponding to the first inter-group index; and sending the first inter-group index or the first inter-group index and the intra-group index to user equipment. The technical scheme of the invention solves the problem of how to transmit and receive the synchronous signal block group under the condition that the synchronous signal block group in the unauthorized frequency spectrum has a plurality of predefined inter-group positions.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting and receiving a synchronization signal block group in an unlicensed spectrum, a storage medium, a base station, and a user equipment.
Background
In a fifth Generation mobile communication technology (5th-Generation,5G) system, a synchronization signal, a broadcast channel, is transmitted in a synchronization signal block, and a beam sweeping function is introduced. Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Physical Broadcast Channel (PBCH) are in a Synchronization Signal block (SS/PBCH block). Each synchronization signal block can be regarded as a resource of one beam (analog domain) in a beam sweeping (beam sweeping) process. A plurality of blocks of Synchronization signals form a burst of Synchronization signals (SS-burst). The synchronization signal burst can be viewed as a block of resources in a relative set that contains multiple beams. The plurality of synchronization signal bursts form a set of synchronization signal bursts (SS-burst-set). The synchronization signal block is repeatedly transmitted on different beams, which is a beam scanning process, and through the training of beam scanning, the user equipment can sense on which beam the received signal is strongest. The time domain positions of the L synchronization signal blocks within a 5ms window are fixed and the indices of the L synchronization signal blocks are arranged consecutively from 0 to L-1 in time domain positions. The transmission time instant of a synchronization signal block within this 5ms window is fixed and the index is also fixed.
A Discovery Reference Signal (DRS) is defined in Long Term Evolution (LTE) and is used for synchronization (time-frequency tracking) and measurement of a Secondary Cell (SCell) by a user equipment, which may be referred to as a "Discovery" function of the Secondary Cell. The DRS has the advantage that the DRS is a long-period signal, and the long-period signal has small interference on the whole network. The DRS is composed of PSS/SSS/Cell Reference Signal (CRS), wherein CRS is a Cell-specific Reference Signal. For Frequency Division duplex (Frequency Division Duplexing) FDD systems, DRS Duration (Duration) is 1 to 5 consecutive subframes (subframes); for Time Division Duplex (TDD) systems, the DRS duration is 2 to 5 consecutive subframes. The transmission Timing of DRS is defined by Discovery Measurement Timing Configuration (DMTC), and the user equipment assumes that DRS occurs once in each DMTC period.
In Licensed Assisted Access (LAA) of LTE, DRS can be used for the discovery function of SCell on unlicensed spectrum, and because of its long-period characteristic, interference to LAA system and heterogeneous system (e.g., Wifi system) sharing unlicensed spectrum can be reduced. The duration of the LAA DRS is 12 OFDM symbols within one non-empty subframe to further reduce interference to LAA systems and inter-systems. LAA DRS also includes PSS/SSS/CRS.
On the unlicensed spectrum of a New Radio (NR), DRSs also need to be defined to enable discovery of cells on the unlicensed spectrum. DRSs on NR unlicensed spectrum need to contain synchronization signal blocks in order for user equipment to be able to detect NR unlicensed spectrum cells in a cell search. In the NR unlicensed spectrum, a base station needs to perform Listen Before Transmission (LBT) Before transmitting a DRS or a synchronization signal block group, and only when it is monitored that a signal is idle, the DRS or the synchronization signal block is transmitted, otherwise, after a certain period of time, the base station performs LBT again. The transmission of the DRS or the synchronization signal block is performed within a certain transmission window agreed by the base station and the user equipment.
However, since LBT needs to be performed, the sync signal block needs to defer transmission when it is sensed that the channel status is busy. To support the synchronization signal block deferral feature over the unlicensed spectrum, the synchronization signal block needs to have many predefined locations. How to design multiple predefined locations of a synchronization signal block on an unlicensed spectrum is an urgent problem to be solved.
Disclosure of Invention
The technical problem solved by the invention is how to transmit and receive the synchronous signal block under the condition that the synchronous signal block has a plurality of predefined positions in the unlicensed spectrum, and the purposes of simplifying system design and reducing signaling overhead are achieved by adopting a mode of delaying transmission of the synchronous signal block group (SS/PBCH block group) or the whole synchronous signal burst and indicating the position between groups.
In order to solve the above technical problem, an embodiment of the present invention provides a method for sending a synchronization signal block group in an unlicensed spectrum, where the method for sending a synchronization signal block group in an unlicensed spectrum includes:
monitoring before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window, wherein the sending window comprises a plurality of inter-group positions, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is at least the time length occupied by the synchronization signal block group; if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the first inter-group index; sending the first inter-group index or the first inter-group index and an intra-group index to user equipment, wherein the intra-group index indicates an intra-group position, and the inter-group position comprises the intra-group position.
Optionally, the time length of the preset time interval is the time length of one subframe or 1 millisecond.
Optionally, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups.
Optionally, the single synchronization signal block group includes synchronization signal blocks in two time slots.
Optionally, the single synchronization signal block group includes synchronization signal blocks within a single time slot.
Optionally, the time length of the preset time interval is at least one time slot.
Optionally, the sending method further includes: if the channel of the inter-group position corresponding to the first inter-group index is monitored to be in a busy state, determining to transmit the synchronization signal block group at the inter-group position corresponding to the inter-group index next to the first inter-group index; monitoring before sending at the position between the groups corresponding to the next group index; if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the next inter-group index; and sending the next inter-group index or the next inter-group index and the intra-group index to user equipment.
Optionally, the synchronization signal block group is included in a discovery reference signal.
The embodiment of the invention also discloses a method for receiving the synchronous signal block group in the unauthorized frequency spectrum, which comprises the following steps: blind detection is carried out on the synchronous signal block group in the sending window; if detect synchronous signal block group, then confirm through sequence detection or the mode of decoding the intergroup index or intergroup index and the intragroup index of the intergroup position that synchronous signal block group is located for confirm timing information, including a plurality of intergroup positions in the sending window, intergroup position and intergroup index one-to-one, the intergroup index sequence that a plurality of intergroup positions correspond is arranged, possesses preset time interval between per two intergroup positions, preset time interval's time length does at least the shared time length of synchronous signal block group, the intragroup index indicates the intragroup position, the intergroup position includes the intragroup position.
Optionally, the time length of the preset time interval is the time length of one subframe or 1 millisecond.
Optionally, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups.
Optionally, the single synchronization signal block group includes synchronization signal blocks in two time slots.
Optionally, the single synchronization signal block group includes synchronization signal blocks within a single time slot.
Optionally, the time length of the preset time interval is at least one time slot.
Optionally, the intra-group index corresponds to an intra-group position, where the intra-group position is a position of a synchronization signal block in the synchronization signal block group.
In order to solve the above technical problem, an embodiment of the present invention further discloses a device for transmitting a synchronization signal block group in an unlicensed spectrum, where the device includes: the first monitoring module is suitable for monitoring before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window, the sending window comprises a plurality of inter-group positions, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is at least the time length occupied by the synchronization signal block group; a first synchronization signal block group sending module, adapted to send the synchronization signal block group at an inter-group position corresponding to the first inter-group index when a channel is monitored to be in an idle state; a first inter-group index sending module adapted to send the first inter-group index or the first inter-group index and an intra-group index to a user equipment, the intra-group index indicating an intra-group location, the inter-group location including the intra-group location.
Optionally, the time length of the preset time interval is the time length of one subframe or 1 millisecond.
Optionally, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups.
Optionally, the single synchronization signal block group includes synchronization signal blocks in two time slots.
Optionally, the single synchronization signal block group includes synchronization signal blocks within a single time slot.
Optionally, the time length of the preset time interval is at least one time slot.
Optionally, the sending apparatus further includes: a determining module, adapted to determine, when it is monitored that a channel is in a busy state, to transmit the synchronization signal block group at an inter-group position corresponding to an inter-group index next to the first inter-group index; a second monitoring module, adapted to perform pre-transmission monitoring before transmitting the synchronization signal block group at an inter-group position corresponding to the next inter-group index; a second synchronization signal block group sending module, adapted to send the synchronization signal block group at an inter-group position corresponding to the next inter-group index when it is monitored that the channel is in an idle state; and the second inter-group index sending module is suitable for sending the next inter-group index or the next inter-group index and the intra-group index to the user equipment.
Optionally, the synchronization signal block group is included in a discovery reference signal.
In order to solve the above problem, an embodiment of the present invention further discloses a receiving apparatus for a synchronization signal block group in an unlicensed spectrum, where the receiving apparatus for a synchronization signal block group in an unlicensed spectrum includes: the blind detection module is suitable for carrying out blind detection on the synchronous signal block group in the sending window; the inter-group index determining module is suitable for detecting when the synchronization signal block group, the mode through sequence detection or decoding is confirmed the inter-group index or the inter-group index and the inter-group index of the inter-group position that the synchronization signal block group is located for confirm timing information, including a plurality of inter-group positions in the sending window, inter-group position and inter-group index one-to-one, the inter-group index order that a plurality of inter-group positions correspond is arranged, possesses preset time interval between per two inter-group positions, preset time interval's time length does at least the shared time length of synchronization signal block group, the inter-group index indicates the inter-group position, the inter-group position includes the inter-group position.
Optionally, the time length of the preset time interval is the time length of one subframe or 1 millisecond.
Optionally, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups.
Optionally, the single synchronization signal block group includes synchronization signal blocks in two time slots.
Optionally, the single synchronization signal block group includes synchronization signal blocks within a single time slot.
Optionally, the time length of the preset time interval is at least one time slot.
In order to solve the above problem, an embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, where the computer instructions execute, when running, the steps of the method for sending the synchronization signal block group in the unlicensed spectrum, or the steps of the method for receiving the synchronization signal block group in the unlicensed spectrum.
In order to solve the above problem, an embodiment of the present invention further discloses a base station, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the step of sending the synchronization signal block group in the unlicensed spectrum when executing the computer instructions.
In order to solve the above problem, an embodiment of the present invention further discloses a user equipment, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the steps of the method for receiving the synchronization signal block group in the unlicensed spectrum when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the base station of the technical scheme of the invention monitors before sending the synchronization signal block group at the inter-group position corresponding to the first inter-group index in the sending window, wherein the sending window comprises a plurality of inter-group positions, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is at least the time length occupied by the synchronization signal block group; if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the first inter-group index; sending the first inter-group index or the first inter-group index and an intra-group index to user equipment, wherein the intra-group index indicates an intra-group position, and the inter-group position comprises the intra-group position. In the technical scheme of the invention, a plurality of inter-group positions are available for sending the synchronous signal block groups in a sending window by a base station; under the condition that the time length of the sending window is fixed, the preset time intervals are different, the number of the positions among the groups in the sending window and the intervals among the positions among the groups are different, so that signaling overhead can be saved when the preset time intervals are larger, and a base station can have more sending opportunities of synchronous signal blocks when the preset time intervals are smaller, so that the communication quality is improved; in addition, by indicating the combination of the inter-group position and the intra-group position, the ue only needs to detect a certain sync block in the group to obtain the timing information, and does not need to detect the entire set of sync blocks.
Further, the time length of the preset time interval is the time length of one subframe or 1 millisecond. In the technical scheme of the invention, the time length of the preset time interval is longer, and under the condition, the quantity of the positions among the groups in the sending window is less, so that when the base station sends the first offset to the user equipment, the base station can use less bit number, and the signaling overhead is saved.
Further, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups. In the technical scheme of the invention, the time length occupied by the synchronous signal block group is shorter, and under the condition, the number of the positions among the groups in the sending window is larger, so that the base station can have more opportunities for monitoring before sending in the sending window, and further the base station can have more opportunities for sending the synchronous signal block in the sending window, thereby improving the sending success rate of the synchronous signal block.
Further, the time length of the preset time interval is at least one time slot. In the technical scheme of the invention, the time length of the preset time interval is in a time slot unit; the time slot is a basic scheduling unit or a calculation unit of the base station and the user equipment, so that the scheduling and calculation of the base station and the user equipment are simpler and more convenient, and the communication efficiency is further improved.
Drawings
Fig. 1 is a flowchart of a method for transmitting a synchronization signal block group in an unlicensed spectrum according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for transmitting a synchronization signal block group in an unlicensed spectrum according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for receiving a synchronization signal block group in an unlicensed spectrum according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for transmitting a synchronization signal block group in an unlicensed spectrum according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a receiving apparatus for a synchronization signal block group in an unlicensed spectrum according to an embodiment of the present invention.
Detailed Description
As described in the background, in the prior art, since LBT is required, the synchronization signal block needs to be transmitted late for a certain time. In order to support the property of deferred transmission of synchronization signal blocks over unlicensed spectrum, the synchronization signal blocks need to have multiple predefined locations. How to design multiple predefined locations of a synchronization signal block on an unlicensed spectrum is an urgent problem to be solved.
In the technical scheme of the invention, a plurality of inter-group positions are available for sending the synchronous signal block groups in a sending window by a base station; under the condition that the time length of the sending window is fixed, the preset time intervals are different, the number of the positions among the groups in the sending window and the intervals among the positions among the groups are different, so that signaling overhead can be saved when the preset time intervals are larger, the base station can have more sending opportunities of the synchronous signal blocks when the preset time intervals are smaller, and the communication quality is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a method for transmitting a synchronization signal block group in an unlicensed spectrum according to an embodiment of the present invention.
The transmission method shown in fig. 1 may be used on the base station side. The transmission method may include the steps of:
step S101: monitoring before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window, wherein the sending window comprises a plurality of inter-group positions, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is at least the time length occupied by the synchronization signal block group;
step S102: if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the first inter-group index;
step S103: sending the first inter-group index or the first inter-group index and an intra-group index to user equipment, wherein the intra-group index indicates an intra-group position, and the inter-group position comprises the intra-group position.
In this embodiment, the synchronization signal block group may be a set of synchronization signal blocks, including one or more synchronization signal blocks. Specifically, the synchronization signal burst may be, or may be a set of synchronization signal bursts. The Synchronization Signal block may include a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
Accordingly, the inter-group position is the overall position of the synchronization signal block group, i.e. the overall time domain position of the synchronization signal block group in the time domain. When the synchronization signal block group is a synchronization signal burst, the inter-group position may be an overall time domain position of the synchronization signal burst. When the synchronization signal block group is a synchronization signal burst set, the inter-group position may be an overall time domain position of the synchronization burst set.
Further, the inter-group position includes an intra-group position. The intra-group position is the position of the sync block within the set of sync block groups. The intra-group positions correspond to intra-group indices one-to-one. The intra-group index may also be carried within the synchronization signal block in a sequential or coded manner.
In a specific implementation, the base station may transmit the synchronization signal block group at an inter-group position within the transmission window. Specifically, the transmission window may be a position in a time domain with a fixed time length, and the length of the transmission window may be configured by a Discovery Measurement Timing Configuration (DMTC) or a Synchronization Measurement Timing Configuration (SMTC), and may be, for example, 5 milliseconds (ms) or 6 ms.
In this embodiment, in the unlicensed spectrum, Before the base station sends the synchronization signal block group, listen Before sending (LBT) needs to be performed, so that a plurality of inter-group positions capable of sending the synchronization signal block group need to be set. In other words, a plurality of inter-group positions can be included in one transmission window, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are sequentially arranged, a preset time interval is provided between every two inter-group positions, and the time length of the preset time interval is at least the time length occupied by the synchronization signal block group. For example, the emission window includes an inter-group position 1, an inter-group position 2, an inter-group position 3, and an inter-group position 4.
In the specific implementation of step S101, the base station is about to transmit the synchronization signal block group at the inter-group position corresponding to the first inter-group index, and the base station may monitor before transmitting. That is, the base station needs to listen whether the second channel is in an idle state.
In the specific implementation of step S102, if the base station monitors that the channel at the inter-group position corresponding to the first inter-group index is in an idle state, it indicates that the channel at the inter-group position corresponding to the first inter-group index is not occupied, and the base station may use the channel to transmit the synchronization signal block group. Thus, the base station transmits the synchronization signal block group at an inter-group position corresponding to the first inter-group index.
In addition, in the implementation of step S103, the base station may further transmit the first inter-group index to the user equipment. That is, the base station may also transmit an inter-group index (i.e., a first inter-group index) of an inter-group position where the transmitted synchronization signal block group is located to the user equipment. In a subsequent step, the user equipment may determine synchronization information from the inter-group index.
Specifically, the base station may directly send the first inter-group index to the user equipment; the base station may also transmit an offset of the first inter-group index with respect to a preset inter-group index to the user equipment. The preset inter-group index may be preset, and the base station and the ue may know the preset inter-group index in advance. For example, the preset inter-group index may be a set of predefined inter-group indices within the transmission window.
It should be noted that the preset inter-group index may also be any other implementable inter-group index, which is not limited in this embodiment of the present invention.
Further, the inter-group index may be carried in a sequence or encoded manner within the synchronization signal block group and transmitted together by the base station to the user equipment.
In the embodiment of the invention, a plurality of inter-group positions are available for a base station to send a synchronization signal block group in a sending window; under the condition that the time length of the sending window is fixed, the preset time intervals are different, the number of the positions among the groups in the sending window and the intervals among the positions among the groups are different, so that signaling overhead can be saved when the preset time intervals are larger, the base station can have more sending opportunities of the synchronous signal blocks when the preset time intervals are smaller, and the communication quality is improved. In addition, the signaling overhead can be further reduced by combining the inter-group index and the intra-group index.
In an embodiment of the present invention, the synchronization Signal block group is included in a Discovery Reference Signal (DRS). That is, the DRS may include a synchronization signal block group. Thus, each step in the transmission method of the synchronization signal block group in the unlicensed spectrum shown in fig. 1 may also be directed to the DRS.
In other words, the method for transmitting the DRS in the unlicensed spectrum may include the following steps: monitoring before transmission before transmitting DRS at an inter-group position corresponding to a first inter-group index in a transmission window; if the monitored channel is in an idle state, transmitting a DRS at an inter-group position corresponding to the first inter-group index; and sending the first inter-group index to user equipment.
In a preferred embodiment of the present invention, the time length of the preset time interval is the time length of one subframe or 1 millisecond.
In the embodiment of the invention, the time length of the preset time interval is longer, and under the condition, the quantity of the positions among the groups in the sending window is less, so that the base station can use less bit number when sending the first offset to the user equipment, and the signaling overhead is saved.
In another preferred embodiment of the present invention, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups.
In the embodiment of the invention, the time length occupied by the synchronous signal block group is shorter, and under the condition, the number of the positions among the groups in the sending window is larger, so that the base station can have more opportunities for monitoring before sending in the sending window, and further the base station can have more opportunities for sending the synchronous signal block in the sending window, thereby improving the sending success rate of the synchronous signal block.
In one embodiment of the invention, a single set of synchronization signal blocks comprises synchronization signal blocks in two time slots.
That is to say, the time length of the preset time interval in this embodiment is the time length occupied by the synchronization signal block in X time slots, and X is an integer greater than or equal to 1.
In a specific application scenario of the embodiment of the present invention, the synchronization signal block may occupy 4 Orthogonal Frequency Division Multiplexing (OFDM) symbols (symbol), and when one time slot may occupy 14 OFDM symbols, there may be 6 synchronization signal blocks in two time slots. That is, the synchronization signal block group includes 6 synchronization signal blocks, and occupies 6 × 4 ═ 24 OFDM symbols. The time length of the preset time interval is 24 × M OFDM symbols, and M is an integer greater than or equal to 1. Furthermore, the remaining 4 symbols of the two slots may be at the beginning of the two slots or at the end of the two slots at the same time, or 2 symbols at the beginning of the two slots and the other 2 symbols at the end of the two slots.
In another specific application scenario of the embodiment of the present invention, when a synchronization signal block may occupy 3 symbols and a time slot may occupy 14 symbols, 8 synchronization signal blocks may be present in two time slots. That is, the synchronization signal block group includes 8 synchronization signal blocks, and occupies 8 × 3 ═ 24 symbols. The time length of the preset time interval is 24 × M symbols, and M is an integer greater than or equal to 1. Furthermore, the remaining 4 symbols of the two slots may be at the beginning of the two slots or at the end of the two slots at the same time, or 2 symbols at the beginning of the two slots and the other 2 symbols at the end of the two slots.
In another specific application scenario of the embodiment of the present invention, when a synchronization signal block may occupy 2 symbols and a time slot may occupy 14 symbols, there are 8 synchronization signal blocks in two time slots. That is, the synchronization signal block group includes 8 synchronization signal blocks, and occupies 8 × 2 ═ 16 symbols. The time length of the preset time interval is 16 × N symbols, and N is an integer greater than or equal to 1. Furthermore, the remaining 12 symbols of the two slots may be at the beginning of the two slots or at the end of the two slots at the same time, or 6 symbols at the beginning of the two slots and 6 symbols at the end of the two slots.
Those skilled in the art will appreciate that the above-described embodiments may be varied into other embodiments, which are not described in detail herein, and are not intended to limit the embodiments of the present invention.
In one embodiment of the invention, the single set of synchronization signal blocks comprises synchronization signal blocks within a single time slot.
The time slot is the basic scheduling unit or the calculation unit of the base station and the user equipment, and the embodiment of the invention can simplify the design by planning the synchronization signal block group by taking one time slot as a unit.
In a specific application scenario of the embodiment of the present invention, when a synchronization signal block occupies 4 symbols and a time slot can occupy 14 symbols, there may be 3 synchronization signal blocks in a time slot. That is, the synchronization signal block group includes 3 synchronization signal blocks, and occupies 3 × 4 ═ 12 symbols. The time length of the preset time interval is 12 × N symbols, and N is an integer greater than or equal to 1. Furthermore, the remaining two symbols of a slot may be at the beginning or the end of the slot at the same time, or 1 symbol at the beginning and 1 symbol at the end of the slot.
In another specific application scenario of the embodiment of the present invention, when a synchronization signal block may occupy 3 symbols and a time slot may occupy 14 symbols, there are 4 synchronization signal blocks in a time slot. That is, the synchronization signal block group includes 3 synchronization signal blocks, and occupies 4 × 3 ═ 12 symbols. The time length of the preset time interval is 12 × N symbols, and N is an integer greater than or equal to 1. Furthermore, the remaining two symbols of a slot may be at the beginning or the end of the slot at the same time, or 1 symbol at the beginning and 1 symbol at the end of the slot.
In another specific application scenario of the embodiment of the present invention, when a synchronization signal block may occupy 2 symbols and a time slot may occupy 14 symbols, there are 6 synchronization signal blocks in a time slot. That is, the synchronization signal block group includes 6 synchronization signal blocks, and occupies 6 × 2 ═ 12 symbols. The time length of the preset time interval is 12 × N symbols, and N is an integer greater than or equal to 1. Furthermore, the remaining two symbols of a slot may be at the beginning of the slot or at the end of the slot at the same time.
Those skilled in the art will appreciate that the above-described embodiments may be varied into other embodiments, which are not described in detail herein, and are not intended to limit the embodiments of the present invention.
In another preferred embodiment of the present invention, the time length of the preset time interval is at least one time slot.
In the embodiment of the invention, the time length of the preset time interval is in a time slot unit; the time slot is a basic scheduling unit or a calculation unit of the base station and the user equipment, so that the scheduling and calculation of the base station and the user equipment are simpler and more convenient, and the communication efficiency is further improved.
In a variation of the present invention, referring to fig. 2, the transmission method shown in fig. 1 may further include the following steps:
step S201: if the monitored channel is in a busy state, determining to transmit the synchronization signal block group at an inter-group position corresponding to an inter-group index next to the first inter-group index;
step S202: monitoring before sending at the position between the groups corresponding to the next group index;
step S203: if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the next inter-group index;
step S204: and sending the next inter-group index or the next inter-group index and the intra-group index to user equipment.
In this embodiment, if the base station monitors that the channel is in a busy state, which indicates that the channel is occupied, the base station cannot transmit the synchronization signal block group at the inter-group position corresponding to the first inter-group index. In this case, the base station may sequentially determine a next inter-group index of the first inter-group indexes within the transmission window, for example, if the first inter-group index is n, then the next inter-group index is n + 1. And determining to transmit the synchronization signal block group at an inter-group position corresponding to an inter-group index next to the first inter-group index.
Similar to the foregoing embodiment, the base station also needs to perform pre-transmission listening to the inter-group position corresponding to the next inter-group index before transmitting the synchronization signal block group at the inter-group position corresponding to the next inter-group index.
In the implementation of step S203 and step S204, if the base station monitors that the channel at the inter-group position corresponding to the next inter-group index is in an idle state, which indicates that the channel is not occupied, the base station may send the synchronization signal block group at the inter-group position corresponding to the next inter-group index. The base station transmits the synchronization signal block group at an inter-group position corresponding to the next inter-group index. In addition, the base station may further transmit the next inter-group index or the next inter-group index and the intra-group index to the user equipment. For the user equipment to determine the positioning information by using the inter-group index in the subsequent step.
Referring to fig. 3, the method for receiving the synchronization signal block group in the unlicensed spectrum may be applied to the user equipment side. The method for receiving the synchronization signal block group in the unlicensed spectrum shown in fig. 3 may include the following steps:
step S301: blind detection is carried out on the synchronous signal block group in the sending window;
step S302: if detect synchronous signal block group, then confirm through sequence detection or the mode of decoding the intergroup index or intergroup index and the intragroup index of the intergroup position that synchronous signal block group is located for confirm timing information, including a plurality of intergroup positions in the sending window, intergroup position and intergroup index one-to-one, the intergroup index sequence that a plurality of intergroup positions correspond arranges, possesses preset time interval between per two intergroup positions, preset time interval's time length does at least the shared time length of synchronous signal block group.
Wherein the intra-group index indicates an intra-group position, the inter-group position including the intra-group position.
In the specific implementation of step S301, since a User Equipment (UE) cannot know a specific location of a synchronization signal block group transmitted by a base station, the UE needs to perform blind detection in a transmission window.
Those skilled in the art will understand that the UE may perform blind detection in any practical manner, and the embodiment of the present invention is not limited thereto.
In the specific implementation of step S302, if the ue detects the synchronization signal block group through blind detection, the ue may determine an inter-group index of an inter-group position where the synchronization signal block group is located through sequence detection or decoding, so as to determine the timing information.
Specifically, the base station may encode the inter-group index and signal it to the user equipment. After the inter-group index is decoded and determined, the user equipment can determine timing information such as a frame boundary, a time slot boundary and the like according to the inter-group index, so that the user equipment can access a network where the unlicensed spectrum is located by using the timing information.
For the principle and more detailed implementation of the receiving method of the synchronization signal block group in the unlicensed spectrum, please refer to the foregoing embodiments, which are not described herein again.
Referring to fig. 4, the apparatus 40 for transmitting synchronization signal block groups in unlicensed spectrum may be used at the base station side, and the apparatus 40 for transmitting synchronization signal block groups in unlicensed spectrum may include a first monitoring module 401, a first synchronization signal block group transmitting module 402, and a first inter-group index transmitting module 403
The first monitoring module 401 is adapted to monitor before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window before sending the synchronization signal block group, where the sending window includes a plurality of inter-group positions, the inter-group positions are in one-to-one correspondence with the inter-group indexes, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is provided between every two inter-group positions, and a time length of the preset time interval is at least a time length occupied by the synchronization signal block group; the first synchronization signal block group sending module 402 is adapted to send the synchronization signal block group at an inter-group position corresponding to the first inter-group index when it is monitored that the channel is in an idle state; the first inter-group index sending module 403 is adapted to send the first inter-group index or the first inter-group index and an intra-group index to the user equipment, the intra-group index indicating an intra-group location, the inter-group location comprising the intra-group location.
In this embodiment, there are a plurality of inter-group positions available for the base station to send a synchronization signal block group in the sending window; under the condition that the time length of the sending window is fixed, the preset time intervals are different, the number of the positions among the groups in the sending window and the intervals among the positions among the groups are different, so that signaling overhead can be saved when the preset time intervals are larger, the base station can have more sending opportunities of the synchronous signal blocks when the preset time intervals are smaller, and the communication quality is improved.
In a preferred embodiment of the present invention, the time length of the preset time interval is the time length of one subframe or 1 millisecond.
In the embodiment of the invention, the time length of the preset time interval is longer, and under the condition, the quantity of the positions among the groups in the sending window is less, so that the base station can use less bit number when sending the first offset to the user equipment, and the signaling overhead is saved.
In another preferred embodiment of the present invention, the time length of the preset time interval is a time length occupied by one or more synchronization signal block groups.
In the embodiment of the invention, the time length occupied by the synchronous signal block group is shorter, and under the condition, the number of the positions among the groups in the sending window is larger, so that the base station can have more opportunities for monitoring before sending in the sending window, and further the base station can have more opportunities for sending the synchronous signal block in the sending window, thereby improving the sending success rate of the synchronous signal block group.
In one embodiment of the invention, a single set of synchronization signal blocks comprises synchronization signal blocks in two time slots.
That is to say, the time length of the preset time interval in this embodiment is the time length occupied by the synchronization signal block in X time slots, and X is an integer greater than or equal to 1.
In one embodiment of the invention, the single set of synchronization signal blocks comprises synchronization signal blocks within a single time slot.
In another preferred embodiment of the present invention, the time length of the preset time interval is at least one time slot.
In the embodiment of the invention, the time length of the preset time interval is in a time slot unit; the time slot is a basic scheduling unit or a calculation unit of the base station and the user equipment, so that the scheduling and calculation of the base station and the user equipment are simpler and more convenient, and the communication efficiency is further improved.
In an embodiment of the present invention, the apparatus 40 for sending a synchronization signal block group in an unlicensed spectrum may further include a determining module (not shown) adapted to determine, when a channel is monitored to be in a busy state, to send the synchronization signal block group at an inter-group position corresponding to an inter-group index next to the first inter-group index; a second monitoring module (not shown) adapted to perform listen before transmission on the inter-group position corresponding to the next inter-group index before the inter-group position corresponding to the next inter-group index transmits the synchronization signal block group; a second synchronization signal block group sending module (not shown) adapted to send the synchronization signal block group at an inter-group position corresponding to the next inter-group index when the channel is monitored to be in an idle state; a second inter-group index sending module (not shown) adapted to send the next inter-group index or the next inter-group index and the intra-group index to the user equipment.
For more contents of the operation principle and the operation mode of the sending apparatus 40 for a synchronization signal block group in the unlicensed spectrum, reference may be made to the relevant descriptions in fig. 1 to fig. 3, and details are not described here again.
Referring to fig. 5, the apparatus 50 for receiving a synchronization signal block group in an unlicensed spectrum may include a blind detection module 501 and an inter-group index determination module 502.
The blind detection module 501 is adapted to perform blind detection on the synchronization signal block group in the transmission window; the inter-group index determining module 502 is adapted to detect the synchronization signal block group, determine the inter-group index of the inter-group position where the synchronization signal block group is located or the inter-group index and the intra-group index in a sequence detecting or decoding manner for determining the timing information, the sending window includes a plurality of inter-group positions, the inter-group positions and the inter-group index one-to-one correspondence, the inter-group index sequence arrangement corresponding to the plurality of inter-group positions is provided with a preset time interval between every two inter-group positions, the time length of the preset time interval is at least the time length occupied by the synchronization signal block group.
For more contents of the operation principle and the operation mode of the receiving apparatus 50 for synchronization signal block groups in the unlicensed spectrum, reference may be made to the relevant descriptions in fig. 1 to fig. 3, and details are not described here again.
The embodiment of the invention also discloses a storage medium, which stores computer instructions, and the computer instructions can execute the steps of the method shown in the figure 1 or the figure 3 when running. The storage medium may include ROM, RAM, magnetic or optical disks, etc. The storage medium may further include a non-volatile memory (non-volatile) or a non-transitory memory (non-transient), and the like.
The embodiment of the invention also discloses a base station which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 1 or fig. 2. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.
The embodiment of the invention also discloses user equipment which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 3. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (23)
1. A method for transmitting synchronization signal block groups in an unlicensed spectrum, comprising:
monitoring before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window, wherein the sending window comprises a plurality of inter-group positions, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is the time length occupied by one or more synchronization signal block groups;
if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the first inter-group index;
and sending the first inter-group index to user equipment.
2. The transmission method of claim 1, wherein a single synchronization signal block group comprises synchronization signal blocks in two time slots.
3. The transmission method of claim 1, wherein a single set of synchronization signal blocks comprises synchronization signal blocks within a single time slot.
4. The transmission method according to claim 1, wherein the predetermined time interval has a time length of at least one time slot.
5. The transmission method of claim 1, further comprising:
if the monitored channel is in a busy state, determining to transmit the synchronization signal block group at an inter-group position corresponding to an inter-group index next to the first inter-group index;
monitoring before sending at the position between the groups corresponding to the next group index;
if the monitored channel is in an idle state, transmitting the synchronization signal block group at an inter-group position corresponding to the next inter-group index;
and sending the next inter-group index or the next inter-group index and the intra-group index to user equipment.
6. The transmission method according to claim 1, wherein the synchronization signal block group is included in a discovery reference signal.
7. A method for receiving a synchronization signal block group in an unlicensed spectrum, comprising:
blind detection is carried out on the synchronous signal block group in the sending window;
if detect synchronous signal block group, then confirm through sequence detection or the mode of decoding the intergroup index of the intergroup position that synchronous signal block group is located for confirm timing information, including a plurality of intergroup positions in the sending window, intergroup position and intergroup index one-to-one, the intergroup index sequence that a plurality of intergroup positions correspond is arranged, possesses preset time interval between per two intergroup positions, preset time interval's time length is the shared time length of one or more synchronous signal block groups.
8. The receiving method according to claim 7, characterized in that the single synchronization signal block group comprises synchronization signal blocks within two time slots.
9. The receiving method of claim 7, wherein a single set of synchronization signal blocks comprises synchronization signal blocks within a single time slot.
10. The receiving method according to claim 7, wherein the preset time interval has a time length of at least one time slot.
11. An apparatus for transmitting a synchronization signal block group in an unlicensed spectrum, comprising:
the first monitoring module is suitable for monitoring before sending a synchronization signal block group at an inter-group position corresponding to a first inter-group index in a sending window, the sending window comprises a plurality of inter-group positions, the inter-group positions correspond to the inter-group indexes one by one, the inter-group indexes corresponding to the plurality of inter-group positions are arranged in sequence, a preset time interval is arranged between every two inter-group positions, and the time length of the preset time interval is the time length occupied by one or more synchronization signal block groups;
a first synchronization signal block group sending module, adapted to send the synchronization signal block group at an inter-group position corresponding to the first inter-group index when a channel is monitored to be in an idle state;
and the first inter-group index sending module is suitable for sending the first inter-group index to the user equipment.
12. The transmitting device of claim 11, wherein a single set of synchronization signal blocks comprises synchronization signal blocks in two time slots.
13. The transmitting device of claim 11, wherein a single set of synchronization signal blocks comprises synchronization signal blocks in a single time slot.
14. The transmitting device of claim 11, wherein the predetermined time interval has a time length of at least one time slot.
15. The transmission apparatus according to claim 11, further comprising:
a determining module, adapted to determine, when it is monitored that a channel is in a busy state, to transmit the synchronization signal block group at an inter-group position corresponding to an inter-group index next to the first inter-group index;
a second monitoring module, adapted to perform pre-transmission monitoring before transmitting the synchronization signal block group at an inter-group position corresponding to the next inter-group index;
a second synchronization signal block group sending module, adapted to send the synchronization signal block group at an inter-group position corresponding to the next inter-group index when it is monitored that the channel is in an idle state;
and the second inter-group index sending module is suitable for sending the next inter-group index or the next inter-group index and the intra-group index to the user equipment.
16. The transmitting apparatus of claim 11, wherein the synchronization signal block group is included in a discovery reference signal.
17. An apparatus for receiving a set of synchronization blocks in an unlicensed spectrum, comprising:
the blind detection module is suitable for carrying out blind detection on the synchronous signal block group in the sending window;
the inter-group index determining module is suitable for detecting when the synchronizing signal block group, the inter-group index of the inter-group position where the synchronizing signal block group is located is determined through sequence detection or decoding mode for determining timing information, a plurality of inter-group positions are included in the sending window, the inter-group positions correspond to the inter-group index one to one, the inter-group index sequences corresponding to the plurality of inter-group positions are arranged, a preset time interval is provided between every two inter-group positions, and the time length of the preset time interval is the time length occupied by one or more synchronizing signal block groups.
18. The receiving device of claim 17, wherein the single set of synchronization signal blocks comprises synchronization signal blocks in two time slots.
19. The receiving device of claim 17, wherein a single set of synchronization signal blocks comprises synchronization signal blocks in a single time slot.
20. The receiving apparatus of claim 17, wherein the predetermined time interval has a time length of at least one time slot.
21. A storage medium having stored thereon computer instructions, wherein the computer instructions are operable to perform the steps of the method for transmitting a set of synchronization blocks in unlicensed spectrum according to any one of claims 1 to 6, or to perform the steps of the method for receiving a set of synchronization blocks in unlicensed spectrum according to any one of claims 7 to 10.
22. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the method for transmitting a set of synchronization signal blocks in unlicensed spectrum according to any one of claims 1 to 6.
23. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the method for receiving a set of synchronization signal blocks in an unlicensed spectrum according to any one of claims 7 to 10.
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| CN111130716B (en) * | 2019-12-12 | 2022-04-22 | 展讯通信（上海）有限公司 | Method and device for processing candidate synchronous signal block |
| JP7498279B2 (en) * | 2020-01-07 | 2024-06-11 | 中興通訊股▲ふん▼有限公司 | Systems and methods for transmitting data - Patents.com |
| WO2022082767A1 (en) * | 2020-10-23 | 2022-04-28 | 华为技术有限公司 | Communication method and related device |
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