CN104796367B - A kind of sending method of synchronizing information, detection method and user equipment - Google Patents
A kind of sending method of synchronizing information, detection method and user equipment Download PDFInfo
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Abstract
The invention discloses a kind of sending method of synchronizing information, detection method and user equipmenies.The sending method of its synchronizing information includes：User equipment sends synchronizing signal in synchronizing signal resource；According to the correspondence of synchronizing signal resource and synchronizing channel resource, a synchronizing channel resource is selected from the corresponding multiple synchronizing channel resources of the synchronizing signal resource；Synchronizing channel is sent in the synchronizing channel resource of selection.Technical solution provided in an embodiment of the present invention, synchronizing signal resource corresponds to multiple synchronizing channel resources, UE therefrom selects a synchronizing channel resource to send synchronizing channel so that different UE can send synchronizing channel in different synchronizing channel resources, so as to avoid interfering with each other between synchronizing channel.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method for sending synchronization information, a method for detecting synchronization information, and a user equipment.
Background
Device-to-Device (D2D), a terminal direct technology, refers to a User Equipment (UE) in the vicinity that can perform data transmission through a direct link within a short distance without forwarding through a central node (i.e., a base station).
The Long Term Evolution (LTE) D2D technology refers to a discovery and communication process of a LTE network-controlled D2D operating in an LTE licensed frequency band. On one hand, the advantages of the D2D technology can be fully utilized, and meanwhile, the control of the LTE network can also overcome some problems of the conventional D2D technology, such as uncontrollable interference and the like. The introduction of LTE D2D features will move the LTE technology from pure wireless mobile cellular communication technology towards "Universal connectivity technology".
The UE first synchronizes before performing D2D transmission (D2D discovery or D2D communication). The UE obtains a synchronization reference for transmitting the D2D signal according to the synchronization signal transmitted by the reference synchronization source. When the UE transmits the D2D signal, it may also simultaneously transmit a synchronization signal to provide a synchronization reference for other UEs. Meanwhile, the UE may also send a synchronization channel when sending the synchronization signal, where the synchronization channel carries information such as resource configuration information or synchronization source information.
Several typical D2D transmission scenarios are included in fig. 1: intra-cell, inter-cell, partial network coverage, and no network coverage D2D transmissions.
For the intra-cell D2D transmission case, the UEs all acquire synchronization with the network side (the reference synchronization source is an evolved node B (eNB, a base station in the LTE system)), and then the UEs may acquire mutual synchronization according to the respective synchronization with the network side to perform D2D transmission on the synchronized discovery resource, and the used D2D resource configuration may also be acquired from the network side.
For the case of D2D transmission between cells, since two cells may not be synchronized, if they are synchronized with the network side, two UEs may not be synchronized, and D2D discovery or D2D communication cannot be performed directly, and the UEs may not know the discovery resources used by the neighboring cells. At this time, the UE needs to obtain the timing reference of the neighboring cell from the eNB or UE of the neighboring cell through the synchronization signal transmitted by the neighboring cell, so as to perform the inter-cell D2D communication. In addition, the UE may also obtain resource configuration information of the neighboring cell from the UE of the neighboring cell through a synchronization channel.
For a scenario with partial network coverage, UEs in the vicinity of the coverage area are not synchronized with UEs in the coverage area, and may cause serious mutual interference. At this time, the UE in the coverage area may forward the synchronization signal and the synchronization channel to the UE outside the coverage area, where the synchronization channel carries the D2D resource configuration information in the coverage area, so that the UE near the coverage area can also transmit with the UE in the coverage area based on the synchronization signal and the D2D resource configuration in the coverage area, thereby reducing interference caused by out-of-synchronization.
For a scene without network coverage, both communication parties do not have access to a network, and in order to ensure synchronization between the two communication parties, respective synchronization signals and synchronization channels can be transmitted, wherein the synchronization channels carry synchronization source information.
During the actual D2D transmission, the reference synchronization sources of different D2D UEs may be the same or synchronized with each other. Then, the synchronization signals transmitted by different D2D UEs are the same, but the information carried by the synchronization channels transmitted by the D2D UEs may be different, and the synchronization channels of the synchronization transmissions may interfere with each other. For example, the forwarded synchronization channels of D2D UEs from different synchronized cells are different from each other (different D2D resource configuration information); and the out-of-coverage UE may also need to send the synchronization channel at the same time to carry the synchronization source information. At this time, there are multiple synchronous channels, causing mutual interference between the synchronous channels.
Disclosure of Invention
The invention aims to provide a sending method and a detection method of synchronous information and user equipment, so as to solve the problem that synchronous channels of synchronous transmission may interfere with each other.
The purpose of the invention is realized by the following technical scheme:
a method for sending synchronization information comprises the following steps:
the UE sends a synchronous signal on a synchronous signal resource;
the UE selects a synchronous channel resource from a plurality of synchronous channel resources corresponding to the synchronous signal resource according to the corresponding relation between the synchronous signal resource and the synchronous channel resource;
the UE transmits a synchronization channel on the selected synchronization channel resource.
The inventor finds that in the process of implementing the present invention, there are multiple different synchronization channels that are synchronized at the same time because the synchronized UEs transmit the synchronization channels on the same physical resource corresponding to the synchronization signal. According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, and the UE selects one synchronous channel resource from the synchronous channel resources to send the synchronous channel, so that different UEs can send the synchronous channel on different synchronous channel resources, and mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
In the embodiment of the present invention, the synchronization signal resource, that is, the physical resource occupied by the synchronization signal, may be a pre-agreed physical resource, may also be a physical resource determined according to the physical resource used by the reference synchronization source to send the synchronization signal, and may also be a physical resource determined by other manners.
The synchronized UEs may transmit synchronization signals using the same synchronization signal resource.
There are various ways to determine the synchronization signal resource according to the physical resource used by the reference synchronization source to transmit the synchronization signal. For example, the UE determines a physical resource used by the reference synchronization source to subsequently transmit the synchronization signal as a synchronization signal resource; the UE can also determine the time domain resource starting position of the synchronization signal resource according to the time domain resource starting position of the physical resource used for sending the synchronization signal by the reference synchronization source, and determine that the period of the synchronization signal resource is the same as the period of sending the synchronization signal by the reference synchronization source.
And the UE transmits a synchronization signal according to the determined synchronization reference. And the synchronization reference is determined based on the detected synchronization signal of the synchronization signal source. Thus, a "successor" in the synchronization reference element subsequent transmission synchronization signals is relative to the synchronization signal of the synchronization signal source from which the UE transmits the synchronization signal.
There are various ways to select one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource. Based on any of the above method embodiments, a preferred implementation manner is to select one synchronization channel resource according to interference information on each synchronization channel resource obtained by measurement. Another preferred implementation is to randomly select one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource.
Based on any of the above method embodiments, preferably, the correspondence between the synchronization signal resource and the synchronization channel resource includes:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
A method for detecting synchronization information comprises the following steps:
the UE detects a synchronous signal on a synchronous signal resource;
after detecting the synchronization signal, the UE detects a synchronization channel on each synchronization channel resource corresponding to the synchronization signal resource according to the correspondence between the synchronization signal resource and the synchronization channel resource.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, each sending end UE can send the synchronous channels on different synchronous channel resources, and the receiving end UE detects the synchronous channels sent by different sending end UEs on different synchronous channel resources, so that mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Preferably, after detecting the synchronization channel, the UE further obtains the D2D resource allocation information from the synchronization channel, and sends or receives the D2D signal according to the D2D resource allocation information.
Preferably, after detecting the synchronization channel, the UE further obtains synchronization source information from the synchronization channel, and determines a synchronization reference according to the synchronization source information.
Based on any of the above receiving end method embodiments, preferably, the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by the reference synchronization source to transmit the synchronization signal.
The method for determining the synchronization signal resource according to the physical resource used by the reference synchronization source to transmit the synchronization signal may include, but is not limited to:
the UE determines physical resources used for subsequently sending the synchronization signals by the reference synchronization source as synchronization signal resources; or,
and the UE determines the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used for sending the synchronous signal by the reference synchronous source, and determines that the period of the synchronous signal resource is the same as the period of sending the synchronous signal by the reference synchronous source.
Based on any of the above receiving end method embodiments, preferably, the correspondence relationship between the synchronization signal resource and the synchronization channel resource may include, but is not limited to:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
Based on the same inventive concept as the method, an embodiment of the present invention provides a UE, including:
a synchronization signal transmitting unit for transmitting a synchronization signal on a synchronization signal resource;
a synchronization channel resource determining unit, configured to select one synchronization channel resource from multiple synchronization channel resources corresponding to the synchronization signal resource according to a correspondence between the synchronization signal resource and the synchronization channel resource;
and a synchronization channel transmitting unit for transmitting the synchronization channel on the selected synchronization channel resource.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, and the UE selects one synchronous channel resource from the synchronous channel resources to send the synchronous channel, so that different UEs can send the synchronous channel on different synchronous channel resources, and mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Preferably, the synchronization signal resource is a physical resource agreed in advance; or, the synchronization signal resource is a physical resource determined according to a physical resource used by the reference synchronization source to transmit the synchronization signal.
On this basis, the UE provided in the embodiment of the present invention may further include a synchronization signal resource determining unit, configured to:
determining physical resources used by a reference synchronization source for subsequently sending a synchronization signal as synchronization signal resources; or,
and determining the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used for sending the synchronous signal by the reference synchronous source, and determining that the period of the synchronous signal resource is the same as the period of sending the synchronous signal by the reference synchronous source.
Based on any of the above UE embodiments, preferably, the synchronization channel resource determining unit is specifically configured to:
selecting a synchronous channel resource according to the interference information on each synchronous channel resource obtained by measurement; or,
one synchronization channel resource is randomly selected from a plurality of synchronization channel resources corresponding to the synchronization signal resource.
Based on any of the above UE embodiments, preferably, the correspondence between the synchronization signal resource and the synchronization channel resource includes:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
Based on the same inventive concept as the method, an embodiment of the present invention further provides a UE, including a processor and a radio frequency unit:
the radio frequency unit is configured to transmit a synchronization signal on a synchronization signal resource;
the processor is configured to select one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource according to a corresponding relationship between the synchronization signal resource and the synchronization channel resource;
the radio frequency unit is further configured to transmit a synchronization channel on the selected synchronization channel resource.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, and the UE selects one synchronous channel resource from the synchronous channel resources to send the synchronous channel, so that different UEs can send the synchronous channel on different synchronous channel resources, and mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Based on the same inventive concept as the method, an embodiment of the present invention provides a user equipment, including:
a synchronization signal detection unit for detecting a synchronization signal on a synchronization signal resource;
and the synchronous channel detection unit is used for detecting a synchronous channel on each synchronous channel resource corresponding to the synchronous signal resource according to the corresponding relation between the synchronous signal resource and the synchronous channel resource after the synchronous signal detection unit detects the synchronous signal.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, each sending end UE can send the synchronous channels on different synchronous channel resources, and the receiving end UE detects the synchronous channels sent by different sending end UEs on different synchronous channel resources, so that mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Preferably, the UE provided in the embodiment of the present invention further includes a D2D signal transmission unit, configured to acquire the D2D resource allocation information from the synchronization channel after the synchronization channel detection unit detects the synchronization channel, and send or receive a D2D signal according to the D2D resource allocation information.
Preferably, the UE provided in the embodiment of the present invention further includes a synchronization reference determining unit, configured to obtain synchronization source information from the synchronization channel after the synchronization channel detecting unit detects the synchronization channel, and determine a synchronization reference according to the synchronization source information.
Based on any of the above method embodiments, preferably, the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by the reference synchronization source to transmit the synchronization signal.
On this basis, the UE provided in the embodiment of the present invention further includes a synchronization signal resource determining unit, configured to:
determining physical resources used by a reference synchronization source for subsequently sending a synchronization signal as synchronization signal resources; or,
and determining the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used for sending the synchronous signal by the reference synchronous source, and determining that the period of the synchronous signal resource is the same as the period of sending the synchronous signal by the reference synchronous source.
Based on any of the above UE embodiments, preferably, the correspondence between the synchronization signal resource and the synchronization channel resource includes:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
Based on the same inventive concept as the method, the embodiment of the invention also provides the user equipment, which comprises the radio frequency unit and the processor.
The processor is configured to control the radio frequency unit to detect a synchronization signal on a synchronization signal resource; and after the radio frequency unit detects the synchronous signals, controlling the radio frequency unit to detect the synchronous channels on each synchronous channel resource corresponding to the synchronous signal resources according to the corresponding relation between the synchronous signal resources and the synchronous channel resources.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, each sending end UE can send the synchronous channels on different synchronous channel resources, and the receiving end UE detects the synchronous channels sent by different sending end UEs on different synchronous channel resources, so that mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Drawings
Fig. 1 is a schematic diagram of a D2D transmission scenario;
fig. 2 is a flowchart of a method for sending synchronization information according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting synchronization information according to an embodiment of the present invention;
fig. 4 is a schematic view of an application scenario of an embodiment provided in the present invention;
fig. 5 is a schematic diagram illustrating a mapping relationship between synchronization signal resources and synchronization channel resources according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a ue according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another ue according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a sending method and a detection method of synchronous information and corresponding embodiments. Wherein the synchronization information includes a synchronization signal and a synchronization channel. The synchronization signal is sent on the synchronization signal resource, the synchronization signal resource corresponds to a plurality of synchronization channel resources, different UE or different types of synchronization channels can occupy different synchronization channel resources, and the interference between different synchronization channels in the synchronization transmission is reduced with small resource overhead while the reliability of the synchronization signal is ensured.
The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 shows a method for sending synchronization information according to an embodiment of the present invention, which specifically includes the following operations:
step 200, the UE sends the synchronization signal on the synchronization signal resource.
Step 210, the UE selects a synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource according to the corresponding relationship between the synchronization signal resource and the synchronization channel resource.
Wherein, the corresponding relation between the synchronization signal resource and the synchronization channel resource is predetermined. Specifically, the configuration may be predetermined, or may be configured by the network side device through high-layer signaling.
The synchronization channel resources are physical resources carrying the synchronization channel, and a plurality of synchronization channel resources corresponding to the synchronization signal resources may occupy different time domain and/or frequency domain resources. For example, different synchronization channel resources occupy different OFDM symbols of the same subframe, or occupy different Physical Resource Blocks (PRBs) within the same subframe
Preferably, there are a plurality of corresponding relationships between the synchronization signal resource and the synchronization channel resource, which are listed as the following:
corresponding relation 1, the synchronization signal resource and the synchronization channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe. For example, the synchronization signal resource occupies the first 1 or 2 OFDM symbols of a subframe, and the synchronization channel resource occupies other OFDM symbols of the subframe.
And the corresponding relation 2 is that the synchronous signal resources and the synchronous channel resources occupy the same bandwidth, and the subframes occupied by the physical resources of the synchronous signals and the subframes occupied by the synchronous channel resources have a fixed corresponding relation. For example, the synchronization channel resources occupy several subframes after the subframe in which the synchronization signal resource is located.
And the corresponding relation 3, the synchronous signal resource and the synchronous channel resource occupy the same subframe but occupy different bandwidths. For example, the synchronization channel resource occupies the entire bandwidth of the subframe in which the synchronization signal resource is located.
Step 220, the UE transmits the synchronization channel on the selected synchronization channel resource.
The inventor finds that in the process of implementing the present invention, there are multiple different synchronization channels that are synchronized at the same time because the synchronized UEs transmit the synchronization channels on the same physical resource corresponding to the synchronization signal. According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, and the UE selects one synchronous channel resource from the synchronous channel resources to send the synchronous channel, so that different UEs can send the synchronous channel on different synchronous channel resources, and mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
In the embodiment of the present invention, the synchronization signal resource, that is, the physical resource occupied by the synchronization signal, may be a pre-appointed physical resource (for example, the time domain occupies the first two OFDM symbols of a certain appointed subframe, and the frequency domain occupies 72 subcarriers in the middle of the bandwidth, where the appointed subframe may be referred to as a synchronization subframe), may also be a physical resource determined according to the physical resource used by the reference synchronization source to send the synchronization signal, and may also be a physical resource determined in other manners.
The synchronized UEs may transmit synchronization signals using the same synchronization signal resource.
There are various ways to determine the synchronization signal resource according to the physical resource used by the reference synchronization source to transmit the synchronization signal. For example, the UE determines a physical resource used by the reference synchronization source to subsequently transmit the synchronization signal as a synchronization signal resource; the UE can also determine the time domain resource starting position of the synchronization signal resource according to the time domain resource starting position of the physical resource used for sending the synchronization signal by the reference synchronization source, and determine that the period of the synchronization signal resource is the same as the period of sending the synchronization signal by the reference synchronization source. Of course, part of the physical resources used by the reference synchronization source for subsequently transmitting the synchronization signal may also be determined as the synchronization signal resources. The integral multiple of the period of the reference synchronization source for subsequently transmitting the synchronization signal can also be used as the period of the synchronization signal resource. The synchronization signal can be started to be sent as the initial position of the time domain resource of the synchronization signal resource after a certain time delay according to the detected physical resource where the synchronization signal of the reference synchronization source is located, and the period which is the same as that of the synchronization signal of the reference synchronization source is adopted. Wherein the certain time may be a half of a period of the synchronization signal.
And the UE transmits a synchronization signal according to the determined synchronization reference. And the synchronization reference is determined based on the detected synchronization signal of the synchronization signal source. Thus, a "successor" in the synchronization reference element subsequent transmission synchronization signals is relative to the synchronization signal of the synchronization signal source from which the UE transmits the synchronization signal.
There are various ways to select one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource. Based on any of the above method embodiments, a preferred implementation is that, according to interference information on each synchronization channel resource obtained by measurement, one synchronization channel resource is selected; for example, the synchronization channel resource with the least interference is selected. Another preferred implementation is to randomly select one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource.
Fig. 3 shows a method for detecting synchronization information according to an embodiment of the present invention, which specifically includes:
step 300, the UE detects the synchronization signal on the synchronization signal resource.
Step 310, after detecting the synchronization signal, the UE detects a synchronization channel on each synchronization channel resource corresponding to the synchronization signal resource according to the corresponding relationship between the synchronization signal resource and the synchronization channel resource.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, each sending end UE can send the synchronous channels on different synchronous channel resources, and the receiving end UE detects the synchronous channels sent by different sending end UEs on different synchronous channel resources, so that mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Preferably, after detecting the synchronization channel, the UE further obtains the D2D resource allocation information from the synchronization channel, and sends or receives the D2D signal according to the D2D resource allocation information.
Preferably, after detecting the synchronization channel, the UE further obtains synchronization source information from the synchronization channel, and determines a synchronization reference according to the synchronization source information.
Based on any of the above receiving end method embodiments, preferably, the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by the reference synchronization source to transmit the synchronization signal.
The method for determining the synchronization signal resource according to the physical resource used by the reference synchronization source to transmit the synchronization signal may include, but is not limited to:
the UE determines physical resources used for subsequently sending the synchronization signals by the reference synchronization source as synchronization signal resources; or,
and the UE determines the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used for sending the synchronous signal by the reference synchronous source, and determines that the period of the synchronous signal resource is the same as the period of sending the synchronous signal by the reference synchronous source.
Based on any of the above receiving end method embodiments, preferably, the correspondence relationship between the synchronization signal resource and the synchronization channel resource may include, but is not limited to:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
The following describes the technical solution provided by the embodiment of the present invention by taking a specific application scenario as an example.
Assume that both UE1 and UE2 are within network coverage and belong to different cells that are synchronized; UE3, UE4 are outside network coverage. Among them, UE1, UE2, and UE3 transmit and UE4 receives synchronization signals and synchronization channels, as shown in fig. 4.
Each UE sending the synchronization signal determines a reference synchronization source and obtains a synchronization reference from the reference synchronization source. The reference synchronization source of the UE1 is cell 1, the reference synchronization source of the UE2 is cell 2, and the reference synchronization source of the UE3 is also cell 1, and is obtained by forwarding through the UE 1. Since cell 1 and cell 2 are synchronized, the three UEs are also actually synchronized.
Taking UE1 as an example, the implementation manner of determining a reference synchronization source and obtaining a synchronization reference is as follows: the UE1 determines the reference synchronization source as cell 1 according to the detected synchronization signal of cell 1, and obtains a synchronization reference from the synchronization signal of the reference synchronization source (which may also be combined with a synchronization channel). The synchronization reference at least comprises time domain synchronization timing and can also comprise frequency domain synchronization reference frequency points.
Wherein if the UE does not detect any synchronization signal or synchronization channel of the reference synchronization source, determining itself as the reference synchronization source. Then, the synchronization channel transmitted by the UE carries information of the reference synchronization source.
The UE1-UE3 respectively transmit synchronization signals on the agreed synchronization signal resources according to the synchronization reference obtained from the reference synchronization source. Specifically, the UE1 and the UE2 obtain synchronization references from downlink synchronization signals of the cell 1 and the cell 2, respectively, and send synchronization signals on predetermined synchronization signal resources, as shown in fig. 5, the synchronization signal resources occupy the first two OFDM symbols of a synchronization subframe in the time domain, and the frequency domain occupies 72 subcarriers (i.e., 6 PRBs) in the middle of the bandwidth; the UE3 determines, according to a synchronization reference obtained from the synchronization signal of the UE1 and in combination with an agreed period of the synchronization signal, a physical resource for the UE1 to subsequently transmit the synchronization signal as a synchronization signal resource for itself to transmit the synchronization signal; since the reference synchronization sources of the three UEs are the same or synchronized, the resource locations of the UEs 1-3 transmitting the synchronization signals coincide.
The UE with the same reference synchronization source or the synchronization with the reference synchronization source sends the same synchronization signal on the appointed synchronization signal resource, so that the receiving power of the synchronization signal can be enhanced, the coverage range of the synchronization signal is expanded, and the synchronization precision is improved.
The UE1-UE3 transmits the synchronization channel on the synchronization channel resource corresponding to the synchronization signal resource. The corresponding relationship between the synchronization signal resources and the synchronization channel resources is shown in fig. 5, where the synchronization signal of each UE occupies 2 OFDM symbols, and corresponds to 6 synchronization channel resources (occupying other OFDM symbols of the same subframe), and each synchronization channel resource occupies 1 PRB. Each UE randomly selects a synchronization channel resource from the multiple synchronization channel resources for transmitting a synchronization channel, and it is assumed that three UEs select the 2 nd, 3 rd and 4 th synchronization channel resources, respectively.
The UE4 detects the synchronization signal on 72 subcarriers in the middle of the bandwidth, and after detecting the synchronization signal, the UE4 detects the synchronization channel on other OFDM symbols of the subframe where the synchronization signal is located except the OFDM symbol where the synchronization signal is located. Each synchronization signal corresponds to 6 synchronization channel resources, and the UE4 needs to detect whether there is a synchronization channel on each synchronization channel resource (occupying 1 PRB) according to the information length of the agreed synchronization channel.
The technical scheme provided by the embodiment of the invention is suitable for various D2D scenes.
Based on the same inventive concept as the method, an embodiment of the present invention provides a UE, as shown in fig. 6, including:
a synchronization signal transmitting unit 601, configured to transmit a synchronization signal on a synchronization signal resource;
a synchronization channel resource determining unit 602, configured to select one synchronization channel resource from multiple synchronization channel resources corresponding to a synchronization signal resource according to a correspondence between the synchronization signal resource and the synchronization channel resource;
a synchronization channel transmitting unit 603, configured to transmit a synchronization channel on the selected synchronization channel resource.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, and the UE selects one synchronous channel resource from the synchronous channel resources to send the synchronous channel, so that different UEs can send the synchronous channel on different synchronous channel resources, and mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Preferably, the synchronization signal resource is a physical resource agreed in advance; or, the synchronization signal resource is a physical resource determined according to a physical resource used by the reference synchronization source to transmit the synchronization signal.
On this basis, the UE provided in the embodiment of the present invention may further include a synchronization signal resource determining unit 602, configured to:
determining physical resources used by a reference synchronization source for subsequently sending a synchronization signal as synchronization signal resources; or,
and determining the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used for sending the synchronous signal by the reference synchronous source, and determining that the period of the synchronous signal resource is the same as the period of sending the synchronous signal by the reference synchronous source.
Based on any of the above UE embodiments, preferably, the synchronization channel resource determining unit 602 is specifically configured to:
selecting a synchronous channel resource according to the interference information on each synchronous channel resource obtained by measurement; or,
one synchronization channel resource is randomly selected from a plurality of synchronization channel resources corresponding to the synchronization signal resource.
Based on any of the above UE embodiments, preferably, the correspondence between the synchronization signal resource and the synchronization channel resource includes:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
Based on the same inventive concept as the method, an embodiment of the present invention further provides a UE, including a processor and a radio frequency unit:
the radio frequency unit is configured to transmit a synchronization signal on a synchronization signal resource;
the processor is configured to select one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource according to a corresponding relationship between the synchronization signal resource and the synchronization channel resource;
the radio frequency unit is further configured to transmit a synchronization channel on the selected synchronization channel resource.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, and the UE selects one synchronous channel resource from the synchronous channel resources to send the synchronous channel, so that different UEs can send the synchronous channel on different synchronous channel resources, and mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Based on the same inventive concept as the method, an embodiment of the present invention provides a user equipment, as shown in fig. 7, including:
a synchronization signal detection unit 701 configured to detect a synchronization signal on a synchronization signal resource;
a synchronization channel detecting unit 702, configured to detect a synchronization channel on each synchronization channel resource corresponding to the synchronization signal resource according to the correspondence between the synchronization signal resource and the synchronization channel resource after the synchronization signal detecting unit detects the synchronization signal.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, each sending end UE can send the synchronous channels on different synchronous channel resources, and the receiving end UE detects the synchronous channels sent by different sending end UEs on different synchronous channel resources, so that mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
Preferably, the UE provided in the embodiment of the present invention further includes a D2D signal transmission unit, configured to acquire the D2D resource allocation information from the synchronization channel after the synchronization channel detection unit detects the synchronization channel, and send or receive a D2D signal according to the D2D resource allocation information.
Preferably, the UE provided in the embodiment of the present invention further includes a synchronization reference determining unit, configured to obtain synchronization source information from the synchronization channel after the synchronization channel detecting unit detects the synchronization channel, and determine a synchronization reference according to the synchronization source information.
Based on any of the above method embodiments, preferably, the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by the reference synchronization source to transmit the synchronization signal.
On this basis, the UE provided in the embodiment of the present invention further includes a synchronization signal resource determining unit, configured to:
determining physical resources used by a reference synchronization source for subsequently sending a synchronization signal as synchronization signal resources; or,
and determining the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used for sending the synchronous signal by the reference synchronous source, and determining that the period of the synchronous signal resource is the same as the period of sending the synchronous signal by the reference synchronous source.
Based on any of the above UE embodiments, preferably, the correspondence between the synchronization signal resource and the synchronization channel resource includes:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
Based on the same inventive concept as the method, the embodiment of the invention also provides the user equipment, which comprises the radio frequency unit and the processor.
The processor is configured to control the radio frequency unit to detect a synchronization signal on a synchronization signal resource; and after the radio frequency unit detects the synchronous signals, controlling the radio frequency unit to detect the synchronous channels on each synchronous channel resource corresponding to the synchronous signal resources according to the corresponding relation between the synchronous signal resources and the synchronous channel resources.
According to the technical scheme provided by the embodiment of the invention, the synchronous signal resources correspond to a plurality of synchronous channel resources, each sending end UE can send the synchronous channels on different synchronous channel resources, and the receiving end UE detects the synchronous channels sent by different sending end UEs on different synchronous channel resources, so that mutual interference among the synchronous channels is avoided. In addition, in the embodiment of the invention, the corresponding relation between the synchronous signal resource and the synchronous channel resource is predetermined, so that the aim of reducing the interference between different synchronous channels of synchronous transmission can be achieved with small resource overhead while the reliability of the synchronous signal is ensured.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (20)
1. A method for transmitting synchronization information, comprising:
the user equipment sends a synchronous signal on a synchronous signal resource;
the user equipment selects a synchronous channel resource from a plurality of synchronous channel resources corresponding to the synchronous signal resource according to the corresponding relation between the synchronous signal resource and the synchronous channel resource;
the user equipment transmits a synchronization channel on the selected synchronization channel resource.
2. The method of claim 1, wherein the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by a reference synchronization source for transmitting a synchronization signal.
3. The method of claim 2, wherein determining the synchronization signal resources based on the physical resources used by the reference synchronization source to transmit the synchronization signal comprises:
the user equipment determines the physical resource used by the reference synchronization source for subsequently sending the synchronization signal as the synchronization signal resource; or,
and the user equipment determines the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used by the reference synchronous source for sending the synchronous signal, and determines that the period of the synchronous signal resource is the same as the period of the reference synchronous source for sending the synchronous signal.
4. The method according to any of claims 1 to 3, wherein selecting one synchronization channel resource from a plurality of synchronization channel resources corresponding to the synchronization signal resource comprises:
selecting a synchronous channel resource according to the interference information on each synchronous channel resource obtained by measurement; or,
and randomly selecting one synchronous channel resource from a plurality of synchronous channel resources corresponding to the synchronous signal resource.
5. The method according to any one of claims 1 to 3, wherein the correspondence between the synchronization signal resource and the synchronization channel resource comprises:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
6. A method for detecting synchronization information, comprising:
the user equipment detects a synchronous signal on a synchronous signal resource;
after detecting the synchronization signal, the user equipment detects the synchronization channel on each synchronization channel resource corresponding to the synchronization signal resource according to the corresponding relation between the synchronization signal resource and the synchronization channel resource.
7. The method of claim 6, wherein after detecting the synchronization channel, the method further comprises:
acquiring D2D resource configuration information from the synchronous channel, and sending or receiving a D2D signal according to the D2D resource configuration information; or,
and acquiring synchronous source information from the synchronous channel, and determining a synchronous reference according to the synchronous source information.
8. The method of claim 6, wherein the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by a reference synchronization source for transmitting a synchronization signal.
9. The method of claim 8, wherein determining the synchronization signal resources based on the physical resources used by the reference synchronization source to transmit the synchronization signal comprises:
the user equipment determines the physical resource used by the reference synchronization source for subsequently sending the synchronization signal as the synchronization signal resource; or,
and the user equipment determines the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used by the reference synchronous source for sending the synchronous signal, and determines that the period of the synchronous signal resource is the same as the period of the reference synchronous source for sending the synchronous signal.
10. The method according to any one of claims 6 to 8, wherein the correspondence between the synchronization signal resource and the synchronization channel resource comprises:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
11. A user device, comprising:
a synchronization signal transmitting unit for transmitting a synchronization signal on a synchronization signal resource;
a synchronization channel resource determining unit, configured to select a synchronization channel resource from multiple synchronization channel resources corresponding to a synchronization signal resource according to a correspondence between the synchronization signal resource and the synchronization channel resource;
and a synchronization channel transmitting unit for transmitting the synchronization channel on the selected synchronization channel resource.
12. The UE of claim 11, wherein the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by a reference synchronization source for transmitting a synchronization signal.
13. The UE of claim 12, further comprising a synchronization signal resource determining unit configured to:
determining the physical resource used by the reference synchronization source for subsequently sending the synchronization signal as the synchronization signal resource; or,
and determining the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used by the reference synchronous source for sending the synchronous signal, and determining that the period of the synchronous signal resource is the same as the period of the reference synchronous source for sending the synchronous signal.
14. The UE of any one of claims 11 to 13, wherein the synchronization channel resource determining unit is specifically configured to:
selecting a synchronous channel resource according to the interference information on each synchronous channel resource obtained by measurement; or,
and randomly selecting one synchronous channel resource from a plurality of synchronous channel resources corresponding to the synchronous signal resource.
15. The UE of any one of claims 11 to 13, wherein the correspondence between the synchronization signal resource and the synchronization channel resource comprises:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
16. A user device, comprising:
a synchronization signal detection unit for detecting a synchronization signal on a synchronization signal resource;
and the synchronous channel detection unit is used for detecting a synchronous channel on each synchronous channel resource corresponding to the synchronous signal resource according to the corresponding relation between the synchronous signal resource and the synchronous channel resource after the synchronous signal detection unit detects the synchronous signal.
17. The UE of claim 16, further comprising a D2D signal transmission unit, configured to obtain D2D resource configuration information from the synchronization channel after the synchronization channel detection unit detects the synchronization channel, and send or receive a D2D signal according to the D2D resource configuration information; or,
the device also comprises a synchronous reference determining unit which is used for acquiring synchronous source information from the synchronous channel after the synchronous channel detecting unit detects the synchronous channel and determining the synchronous reference according to the synchronous source information.
18. The UE of claim 16, wherein the synchronization signal resource is a pre-agreed physical resource; or, the synchronization signal resource is a physical resource determined according to a physical resource used by a reference synchronization source for transmitting a synchronization signal.
19. The UE of claim 18, further comprising a synchronization signal resource determining unit configured to:
determining the physical resource used by the reference synchronization source for subsequently sending the synchronization signal as the synchronization signal resource; or,
and determining the time domain resource starting position of the synchronous signal resource according to the time domain resource starting position of the physical resource used by the reference synchronous source for sending the synchronous signal, and determining that the period of the synchronous signal resource is the same as the period of the reference synchronous source for sending the synchronous signal.
20. The UE of any one of claims 16 to 18, wherein the correspondence between the synchronization signal resource and the synchronization channel resource comprises:
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, but occupy different OFDM symbols of the same subframe; or,
the synchronous signal resource and the synchronous channel resource occupy the same bandwidth, and a subframe occupied by the physical resource of the synchronous signal and a subframe occupied by the synchronous channel resource have a fixed corresponding relation; or,
the synchronization signal resource and the synchronization channel resource occupy the same subframe but occupy different bandwidths.
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| JP6757323B2 (en) * | 2015-09-01 | 2020-09-16 | 株式会社Ｎｔｔドコモ | Terminal and wireless communication method |
| WO2017049602A1 (en) * | 2015-09-25 | 2017-03-30 | 华为技术有限公司 | Sequence configuration method, subframe generating method, network side device, and user equipment |
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| CN108737309B (en) * | 2017-04-20 | 2020-10-16 | 中国移动通信有限公司研究院 | A synchronization method and device applied to a 5G system |
| CN108809551B (en) * | 2017-04-27 | 2021-09-07 | 华为技术有限公司 | Method and device for sending synchronization signal |
| CN111083784B (en) | 2018-10-22 | 2022-07-01 | 上海朗帛通信技术有限公司 | Method and device used in node of wireless communication |
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