CN103997727B - A kind of method for discovering equipment and device - Google Patents
A kind of method for discovering equipment and device Download PDFInfo
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Abstract
The invention discloses a kind of method for discovering equipment, access node receiving device finds first resource configuration, it finds that first resource configuration is generated for the Secondary resource configuration to user equipment (UE) indicating equipment discovery resource according to the equipment, and Secondary resource configuration is sent to UE；The equipment discovery resource carries out the equipment discovery of device-to-device communication for UE；The present invention also discloses a kind of equipment to find device, scheme through the invention, it is not only able to realize the equipment discovery in cell, it can also realize the mutual discovery for residing at different community UE, while the equipment of device-to-device communication is found the problem in solving cellular communication system, the popularity of device-to-device communications applications is significantly improved.
Description
Technical Field
The present invention relates to cellular wireless communication technologies, and in particular, to a device discovery method and apparatus.
Background
Since cellular communication realizes the reuse of limited spectrum resources, wireless communication technology has been developed vigorously. In a cellular communication system, when there is service transmission between two User equipments (UEs, User equipments), service data from the User Equipment 1(UE1) to the User Equipment 2(UE2) is first transmitted to an access Node of a cell in which the UE1 is located over an air interface, where the access Node may be a Base Station (BS), a Node B (NB, Node B), an evolved Node B (eNB, evolved Node B), an enhanced Node B (eNB, enhanced Node B), or the like, where the access Node transmits the User data to the access Node of the cell in which the UE2 is located through a core network, and the access Node of the cell in which the UE2 is located transmits the service data to the UE2 over the air interface. Similar processing flows are adopted for traffic data transmission from UE2 to UE 1.
Obviously, the above communication method is not optimal when two UEs are close to each other. In fact, with the diversification of mobile communication services, for example, the popularization of social networks, electronic payments, and the like in wireless communication systems, the demand for service transmission between close-range users is increasing. Thus, Device-to-Device (D2D) communication modes are of increasing interest. D2D means that the service data is directly transmitted from the source UE to the target UE over the air interface without being forwarded by the access node and the core network. This communication mode is different from that of the conventional cellular system. For users of short-range communication, D2D not only saves wireless spectrum resources, but also reduces data transmission pressure of the core network.
In cellular communication, when two UEs perform communication, the UEs themselves do not generally need to know the location of the other UE, but establish a connection between the two UEs through a network side device, such as an access node or a core network device. For D2D communication, the premise for establishing communication connection is mutual discovery between UEs, which may also be referred to as device-to-device discovery or device discovery, and in an actual network, the location distribution of UEs is random, and UEs with device-to-device communication conditions that are relatively close to each other may reside in the same cell or different cells, such as neighboring cells, and device discovery in D2D communication needs to consider the above situations.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a device discovery method and apparatus, which solve the device discovery problem of device-to-device communication in a cellular communication system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a device discovery method, which comprises the following steps:
the access node receives the first resource configuration of device discovery, generates a second resource configuration used for indicating device discovery resources to the user equipment according to the first resource configuration of device discovery, and sends the second resource configuration to the user equipment;
the device discovery resources are used for device discovery for device-to-device communication by a user equipment.
In the above solution, the receiving, by the access node, a device discovery first resource configuration, and generating, according to the device discovery first resource configuration, a second resource configuration for indicating a device discovery resource to a user equipment includes:
the first resource configuration is sent by an upper layer network entity, the first resource configuration comprises an upper layer configuration parameter of the device discovery resource, and the access node generates a second resource configuration used for indicating the device discovery resource according to the upper layer configuration parameter and a wireless frame and/or a wireless subframe of a subordinate cell at regular time;
or, the first resource configuration is sent by an upper network entity, the first resource configuration includes an upper configuration parameter of the device discovery resource, and the access node generates, according to the upper configuration parameter, a second resource configuration for indicating the device discovery resource.
In the above solution, the receiving, by the access node, a device discovery first resource configuration, and generating, according to the device discovery first resource configuration, a second resource configuration for indicating a device discovery resource to a user equipment UE includes:
the first resource configuration is sent by other access nodes, the first resource configuration comprises device discovery resource configuration parameters of the other access nodes or subordinate cells of the other access nodes, and the access nodes generate second resource configurations for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes and wireless frames and/or wireless subframes of the subordinate cells at regular time;
or the first resource configuration is sent by another access node, the first resource configuration includes a device discovery resource configuration parameter of the another access node, and the access node generates a second resource configuration for indicating a device discovery resource according to the device discovery resource configuration parameter of the another access node.
In the above scheme, the method further comprises:
the second resource configuration is used for indicating the configuration of the device discovery resources of the cells under the control of the other access nodes;
the access node is configured with a third resource configuration for indicating the discovery resources of the self subordinate cell equipment;
and the access node sends the second resource configuration and the third resource configuration to user equipment.
In the above scheme, the device discovery resource is a time domain resource;
the upper layer configuration parameters indicate the time domain resources by indicating the positions of logical frames and/or logical subframes, the access node generates configuration parameters for indicating the time domain resources according to the timing deviation of the logical frames and/or logical subframes and radio frames and/or radio subframes of a subordinate cell, and sends the configuration parameters to user equipment through second resource configuration; or,
the upper layer configuration parameters indicate the time domain resources by indicating the positions of wireless frames and/or wireless subframes, the access node generates configuration parameters for indicating the time domain resources according to the positions of the wireless frames and/or wireless subframes, and sends the configuration parameters to user equipment through second resource configuration.
In the above scheme, the device discovery resource is a time domain resource;
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes; the access node generates a configuration parameter for indicating the time domain resource according to the deviation of the radio frame and/or radio subframe timing of the subordinated cell of the access node and the radio frame and/or radio subframe timing of the subordinated cell of the other access node, and sends the configuration parameter to the user equipment through second resource configuration; or,
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes; and the access node generates a configuration parameter for indicating the time domain resource according to the position of the wireless frame and/or the wireless subframe, and sends the configuration parameter to the user equipment through second resource configuration.
In the foregoing solution, the third resource allocation includes a configuration parameter for indicating a device of the access node subordinate cell to discover a time domain resource, and the configuration parameter indicates the time domain resource by indicating a radio frame and/or a radio subframe position.
In the above scheme, the first resource configuration further includes a frequency domain resource configuration parameter discovered by the device;
the frequency domain resource configuration parameter indicates, by indicating the allocated frequency domain resource block and/or carrier index, a device discovery frequency domain resource, which is used for device discovery of device-to-device communication by the user equipment.
In the foregoing scheme, the third resource configuration includes a frequency domain resource configuration parameter, where the frequency domain resource configuration parameter indicates, by indicating the allocated frequency domain resource block and/or carrier index, that the device discovers the frequency domain resource, and the device discovers the frequency domain resource, where the frequency domain resource is used for device discovery of device-to-device communication performed by the user equipment.
In the foregoing solution, the other access node is an access node having at least one of the following characteristics:
a main access node belonging to a discovery area with the access node;
an access node adjacent to the access node;
an access node having a communication link with the access node;
an access node configured with device discovery resources.
The invention provides a device discovery device, which comprises: the system comprises a first communication module, a wireless resource allocation module and a second communication module; wherein,
the first communication module is configured to receive a device discovery first resource configuration;
the radio resource configuration module is configured to generate a second resource configuration for indicating device discovery resources to a user equipment according to the first resource configuration;
the second communication module is configured to send the second resource configuration generated by the wireless configuration module to the user equipment;
the device discovery resources are used for device discovery for device-to-device communication by a user equipment.
In the foregoing solution, the first communication module is configured to receive a first resource configuration sent by an upper network entity, where the first resource configuration includes an upper configuration parameter of a device discovery resource;
correspondingly, the radio resource configuration module is configured to generate a second resource configuration for indicating the device to discover resources at regular time according to the upper layer configuration parameter and a radio frame and/or a radio subframe of the subordinate cell;
or, the first communication module is configured to receive a first resource configuration sent by an upper network entity, where the first resource configuration includes an upper configuration parameter of a device discovery resource;
correspondingly, the radio resource configuration module is configured to generate a second resource configuration for indicating the device discovery resource according to the upper layer configuration parameter.
In the foregoing scheme, the first communication module is configured to receive a first resource configuration sent by another access node, where the first resource configuration includes a device discovery resource configuration parameter of the other access node;
correspondingly, the radio resource configuration module is configured to generate a second resource configuration for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes and the radio frame and/or radio subframe timing of the subordinate cell;
or, the first communication module is configured to receive a first resource configuration sent by another access node, where the first resource configuration includes a device discovery resource configuration parameter of the other access node;
correspondingly, the radio resource configuration module is configured to generate a second resource configuration for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes.
In the foregoing solution, the second resource configuration is configured to indicate configuration of a device discovery resource of a cell subordinate to the other access node;
the radio resource configuration module is further configured to configure a third resource configuration for indicating a discovery resource of a device in a subordinate cell of the radio resource configuration module;
the second communication module is configured to send the second resource configuration and the third resource configuration to a user equipment.
In the above scheme, the device discovery resource is a time domain resource;
the upper layer configuration parameter indicates the time domain resource by indicating the position of a logical frame and/or a logical subframe;
the radio resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the timing deviation of the logic frame and/or the logic subframe and a radio frame and/or a radio subframe of a subordinate cell;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration;
or,
the upper layer configuration parameters indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the wireless resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the wireless frame and/or wireless subframe position;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration.
In the above scheme, the device discovery resource is a time domain resource;
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the wireless resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the deviation of the wireless frame and/or wireless subframe timing of the subordinated cell of the wireless resource configuration module and the wireless frame and/or wireless subframe timing of the subordinated cells of other access nodes;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration;
or,
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the wireless resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the wireless frame and/or wireless subframe position;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration.
The invention also provides a device discovery device, which comprises: a first resource configuration module and a third communication module; wherein,
the first resource configuration module to configure a device discovery resource and generate a first resource configuration indicating the device discovery resource;
the third communication module is configured to send the first resource configuration configured by the first resource configuration module to an access node.
In the foregoing solution, the first resource allocation module is configured to generate a first resource allocation including an upper layer configuration parameter of a device discovery resource; or for generating a first resource configuration comprising device discovery resource configuration parameters of other access nodes.
The invention provides a device discovery method and a device, wherein an access node receives a first resource configuration discovered by a device, generates a second resource configuration used for indicating the device discovery resource to UE according to the first resource configuration discovered by the device, and sends the second resource configuration to the UE; the device discovery resource is for device discovery of a UE for device-to-device communication; thus, not only can the discovery of the devices in the cell be realized, but also the mutual discovery of the UEs residing in different cells can be realized, and the device discovery problem of the device-to-device communication in the cellular communication system is solved, and meanwhile, the universality of the device-to-device communication application is obviously improved.
Drawings
FIG. 1 is a diagram illustrating a structure of a wireless frame in the prior art;
FIG. 2 is a diagram illustrating a structure of a frequency domain resource in the prior art;
fig. 3 is a schematic diagram of a network deployment of a cellular wireless communication system in the prior art;
fig. 4 is a schematic diagram of a ue with D2D communication capability camping in different cells;
fig. 5 is a schematic flowchart of a device discovery method provided in the present invention;
fig. 6 is a schematic diagram of a network deployment with an upper network entity according to the present invention;
fig. 7 is a schematic diagram of network deployment for implementing device discovery between access nodes according to the present invention;
FIG. 8 is a schematic diagram of a time domain resource allocation provided by the present invention;
fig. 9 is a schematic structural diagram of a first device discovery apparatus provided in the present invention;
fig. 10 is a schematic structural diagram of a second device discovery apparatus provided in the present invention.
Detailed Description
Common cellular wireless communication systems may be based on Code Division Multiple Access (CDMA) technology, Frequency Division Multiple Access (FDMA) technology, Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), etc., for example, 3GPP (3rd Generation Partnership Project) Long Term Evolution (LTE, Long Term Evolution)/Long Term Evolution-Advanced (LTE-a, LTE-Advanced) cellular communication system downlink (or referred to as forward link) is based on OFDMA technology, and uplink (or referred to as reverse link) is based on SC-FDMA technology.
In a system based on OFDMA/SC-FDMA technique, a Radio Resource (Radio Resource) for communication is in a form of two dimensions of time-frequency. For example, for the LTE/LTE-a system, the communication resources of the uplink and downlink are divided in units of radio frames (radio frames) in the time direction, as shown in fig. 1, each radio frame is 10ms long and includes 10 subframes (sub-frames) with a length of 1ms, and each subframe includes two slots (slots) with a length of 0.5 ms. Each slot may include 6 or 7 OFDM or SC-FDM symbols depending on the configuration of a Cyclic Prefix (CP).
In the frequency direction, resources are divided in units of subcarriers (subcarriers). In specific communication, the minimum unit of frequency domain Resource allocation is a Resource Block (RB) corresponding to one Physical Resource Block (PRB) of a Physical Resource, and as shown in fig. 2, one PRB includes 12 sub-carriers in the frequency domain and corresponds to one slot in the time domain. The resource corresponding to one subcarrier on each OFDM/SC-FDM symbol is called a Resource Element (RE).
In LTE/LTE-a cellular communication, a UE discovers an LTE/LTE-a network by detecting a Synchronization Signal (SS), and acquires downlink frequency and time Synchronization with an access node. Moreover, since the synchronization signal carries a Physical Cell Identity (PCID), detecting the synchronization signal also means that the UE finds the LTE/LTE-a Cell.
For the uplink, when there is uplink data transmission for the UE, it needs to initiate Random Access (RA) for uplink synchronization, and initiate establishment of Radio Resource Control (RRC) connection to the network side, that is, enter an RRC Connected (Connected) state from an RRC Idle (Idle) state. When random access is performed, the UE needs to send a random access preamble (preamble), and the network side detects the random access preamble in a specific time-frequency resource to implement UE identification and uplink synchronization.
Fig. 3 is a schematic diagram of a network deployment of a cellular wireless communication system, and the cellular wireless communication system shown in fig. 3 may be a 3GPP LTE/LTE-a system or a system based on other cellular wireless communication technologies. In an access network of a cellular wireless communication system, a network device generally includes a certain number of base stations (referred to as Node bs, evolved Node bs, enbs, or enhanced Node bs, enbs), and other network entities (network entities). In the 3GPP system, it can also be referred to as Evolved Universal Terrestrial Radio access network (E-UTRAN). Here, the base station also includes a Low Power Node (LPN) in an access network, for example, a femto cell or a home base station, such as pico, or Relay, or femto, or henb (home enb), etc. For simplicity of description and to avoid ambiguity, the base station and the low power node described above are collectively referred to herein as an access node.
Fig. 3 only shows 3 access nodes, each access node provides a certain wireless signal coverage, a UE in the coverage can perform wireless communication with the access node, a wireless signal coverage area of one access node may be divided into one or more cells (cells) or sectors (sectors) based on a set criterion, for example, three cells, and the wireless communication of each cell may be processed by an independent subsystem, for example, an independent radio frequency unit; for a cell covered by a low power node, since the coverage area is much smaller than that of a cell covered by a conventional access node, the cell covered by the low power node may also be referred to as a small cell (small cell).
When the device discovery for D2D communication in the cellular communication system uses the wireless resources of the cellular network, the device discovery process needs network-side assistance, the device discovery is managed by the network-side assistance, the device discovery is prevented from interfering with the cellular communication, and the efficiency of the device discovery can be improved by the network-side assistance. For example, the base station may allocate radio resources for device discovery, and the UE communicating with D2D may perform device discovery in the allocated radio resources. However, in the LTE/LTE-a system, the radio resources of the subordinate cells of different access nodes may be unsynchronized, and such unsynchronization may cause the devices of the subordinate cells of different access nodes to discover different radio resources, so that when the UEs belong to the subordinate cells of the different access nodes, even if the UEs are close to each other, device discovery may not be achieved, such as UE1 and UE2 shown in fig. 4. In other words, the above network-assisted device discovery method can only implement device discovery for user equipment in a cell or in a cell subordinate to the same access node, that is, the device discovery will be limited by the coverage of the access node or the cell.
According to the current cellular network development, small cells (small cells) may become a common direction for the development of LTE/LTE-a networks. In small cell scenarios, the coverage of a cell will be very small (hundreds of meters or even tens of meters); thus, if the range or distance discovered by the D2D device is limited by the coverage of the access node or cell, the application of D2D communications will certainly be very limited.
Based on the above consideration, the present invention provides a device discovery method, and the basic idea includes: the access node receives the first resource configuration discovered by the equipment, generates a second resource configuration used for indicating the equipment discovery resource to the UE according to the first resource configuration discovered by the equipment, and sends the second resource configuration to the UE; the device discovery resources are used for device discovery by the UE for device-to-device communication.
The invention is further described in detail below with reference to the figures and the specific embodiments.
The present invention implements a device discovery method, as shown in fig. 5, the method comprising the steps of:
step 101: the access node receives a first resource configuration discovered by equipment;
as shown in fig. 6, the first resource configuration may be sent by an upper network Entity (upperlayer network Entity/Element) in a discovery area, where the first resource configuration includes an upper configuration parameter of a device discovery resource;
in this step, as shown in fig. 7, the first resource configuration may be sent by another access node, that is, the eNB3 serves as another access node to send the first resource configuration to the eNB4, where the first resource configuration includes the device discovery resource configuration parameters of the another access node or a cell subordinate to the another access node;
the device discovery resource may be a time domain resource;
the upper layer configuration parameter indicates the time domain resource by indicating a logical frame and/or logical subframe position, and the "logical" is used herein only for distinguishing from a radio frame or subframe number, which means that the frame or subframe number indicated by the upper layer configuration parameter is not a radio frame or subframe number; or,
the upper layer configuration parameter indicates the time domain resource by indicating a radio frame and/or a radio subframe position.
The equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
there may be N access nodes in the discovery area, where N is an integer greater than or equal to 1;
the other access node is an access node having at least one of the following characteristics:
the access node comprises a main access node which belongs to the same discovery area with the access node, an access node adjacent to the access node, an access node with a communication link between the access node and the main access node, and an access node configured with equipment discovery resources; the communication link may be wireless communication, or communication of an X2 port communication, or communication of an optical fiber connection.
The upper layer configuration parameter indicates the time domain resource by indicating a logical frame and/or a logical subframe position, or the upper layer configuration parameter indicates the time domain resource by indicating a radio frame and/or a radio subframe position, specifically:
determining the location of the time domain resource by indicating a combination of a System Frame Number and a subframe Number, for example, setting an allocation Period (Period) and an allocation Offset (Offset) of a device discovery logical Frame or a radio Frame, when the System Frame Number (SFN, System Frame Number) of the logical Frame or the radio Frame satisfies SFN mod Period ═ Offset, indicating that the logical Frame or the radio Frame is configured as a device discovery logical Frame or a radio Frame, that is, there is a time domain resource in the logical Frame or the radio Frame, and indicating a logical subframe or a radio subframe in which the time domain resource is located in the logical Frame or the radio Frame in a bitmap form; here, the allocation period may be configurable, such as configurable to be 1, or 2, or 4, or 8, or 16, or 32, or 64, etc., and the allocation offset may be configurable, such as configurable to be 0, or 1, or 2, or 3, or 4, or 5, or 6, or 7, etc.; alternatively, the allocation period may be agreed, such as about 16, or 32, the allocation offset may be agreed, such as about 0-16, or 0-32, etc.; the values of the distribution period and the distribution offset can be any integer value within the system frame number range;
in the logical frame or the radio frame, a logical subframe or a radio subframe in which the time domain resource is located is represented in a bitmap form, for example, a subframe in which the time domain resource is located in one radio frame can be represented in an m-bit bitmap, and m is the maximum subframe number of the subframe in which the time domain resource can be configured in one radio frame, for example, the value is 6 or 10; or, a plurality of radio frames may be used as a basic unit to configure the subframe where the time domain resource is located, for example, 2, 4, 8, or 32 radio frames are used as a basic unit, so that the size of the bitmap corresponds to 2m, 4m, 8m, or 32m bits, respectively, and m is as defined above. It should also be noted that, here, 2, 4, 8, and 32 are all examples and are not limiting;
alternatively, the location of the time domain resource may be determined by indicating only a Subframe Number, for example, an allocation Period and a Subframe allocation Offset of the device discovery Subframe may be set, and when a Subframe Number (SN, Subframe Number) of a logical Subframe or a radio Subframe satisfies (SFN × 10+ SN) mod periodic ═ Offset, it indicates that the logical Subframe or the radio Subframe is configured as the device discovery Subframe, that is, the Subframe includes the device discovery time domain resource;
or, the position of the time domain resource can be determined by only indicating the system frame number;
the setting of the allocation period and the allocation offset of the device discovery radio frame may be:
setting the allocation period and allocation offset of a device discovery radio frame according to the deviation of the number of air interface radio frames/subframes of each access node or a cell to which each access node belongs, so that the device discovery time domain resources configured by the cells to which different access nodes belong are synchronous at the air interface; for example, taking fig. 6 as an example, the upper network entity knows that the number Offset (Offset) of the air interface frames of eNB1 and eNB2 is 1 radio frame +4 subframe, as shown in fig. 8, the time domain resource that the upper network entity needs to configure is 1 subframe for device discovery every 4 radio frames, the upper network entity sets the allocation Period of the device discovery radio frame of eNB1 to 4, the allocation Offset of the device discovery radio frame to 2, the bitmap is a 10-bit bitmap whose value is 1000000000, the allocation Period of the device discovery radio frame of eNB2 to 4, the allocation Offset of the device discovery radio frame to 0, and the bitmap to 10-bit bitmap whose value is 0000000001;
the setting of the allocation period and the allocation offset of the device discovery logical frame may be:
the allocation period and allocation offset of the device discovery logical frame may be set only, and the allocation period and allocation offset of the device discovery logical frame are represented by logical frame/logical subframe numbers, and the logical frame/logical subframe numbers may be the numbers of air interface radio frames/subframes of any access node in a discovery region, or may be self-defined logical frame/logical subframe numbers; for example, the upper network entity in fig. 6 uses the air interface radio frame/subframe number of the cell to which eNB2 belongs as the logical frame/logical subframe number, and sets the allocation period and allocation offset of the device discovery radio frame of the subordinate eNB according to the air interface radio frame/subframe number, such as: the time domain resource to be configured is that 1 subframe is used for device discovery in every 4 wireless frames, then the allocation Period of the device discovery logical frame is set to be 4, the allocation Offset of the device discovery logical frame is 0, and the bitmap is a 10-bit bitmap whose value is 0000000001;
in this step, the first resource configuration may further include a frequency domain resource configuration parameter discovered by the device;
the frequency domain resource configuration parameter indicates, by indicating a frequency domain resource block and/or a Carrier (Carrier, or Component Carrier) index, a device discovery frequency domain resource, where the device discovery frequency domain resource is used for device discovery of device-to-device communication performed by a UE;
the determining, by means of indicating the frequency domain resource block, that the device finds the frequency domain resource is: the allocated frequency domain resource block can be indicated as a device discovery resource block in a bitmap (bitmap) mode; or, the allocated frequency domain Resource block may be indicated as a device discovery Resource block in a Resource Allocation (RA) manner defined in the LTE cellular system, where the RA manner includes: RA mode 0(type 0), mode 1(type 1), or mode 2(type 2); or, the size of the device discovery resource block, such as 4 resource blocks, or 6 resource blocks, may be predefined, and the allocated frequency domain resource block is indicated as the device discovery resource block by using the upper layer configuration information to indicate the starting position of the device discovery resource block, which may also be represented in a bitmap manner;
the determining of the device discovery frequency domain resource by indicating the frequency domain resource block may further be: indicating allocated frequency domain resource blocks as device discovery resource blocks by way of an index indicating a frequency domain resource configuration, e.g., predefined forThe frequency domain resource allocation of device discovery, each frequency domain resource allocation corresponding to an index, when the device discovery frequency domain resource is configured, the device discovery resource block is indicated by the index indicating the allocated frequency domain resource allocation, e.g. about N RBs are taken as the basic configuration unit of the frequency domain resource of device discovery, and assuming that the size of the system bandwidth or the available resource block of device discovery or the available bandwidth of device discovery is N resource blocks, the basic configuration unit of the available device discovery has N/N rounded-down (i.e. N/N is rounded down)) Can pass throughThe index corresponding to the basic configuration unit indicates the equipment to find the resource block, or passes thisThe bitmap corresponding to each basic configuration unit indicates the device to find the resource block.
The indicating, by indicating the carrier index, the device discovery frequency domain resource may be: pre-allocating carrier indexes of the device discovery carriers, which can be agreed, such as: appointing the carrier with the lowest frequency as a device discovery carrier or appointing frequency domain resource allocation to be suitable for each carrier or cell;
configuration information of discovery signal resources for device discovery may also be included in the first resource configuration, where the discovery signal resources may be a sequence, and the sequence may be a reference signal sequence, or a synchronization signal sequence, or a preamble sequence, for example: predefining a set of discovery signal resources for device discovery in the system, and allocating a part of the discovery signal resources in the set to a device discovery area for use;
the discovery signal resources for device discovery may be agreed upon, such as: a set of discovery signal resources for device discovery is predefined in the system and it is agreed that device discovery signals in the set are all available for device discovery for D2D communication, i.e. the device discovery signals do not need to be reconfigured.
Step 102: the access node generates a second resource configuration used for indicating the equipment discovery resource to the UE according to the first resource configuration of the equipment discovery;
in this step, the access node may generate a second resource configuration for indicating the device discovery resource at regular time according to the upper layer configuration parameter and the radio frame and/or radio subframe of the subordinate cell;
or the access node directly generates a second resource configuration for indicating the device discovery resource according to the upper layer configuration parameter.
In this step, the access node may periodically generate a second resource configuration for indicating the device discovery resource according to the device discovery resource configuration parameters of other access nodes and the radio frame and/or radio subframe of the subordinate cell;
or the access node directly generates a second resource configuration for indicating the device discovery resource according to the device discovery resource configuration parameters of other access nodes;
here, in this step, the second resource configuration may be only used to indicate the configuration of the device discovery resource of the cell subordinate to the other access node; the access node is also configured with a third resource configuration used for indicating the discovery resources of the self subordinate cell equipment;
the third resource configuration may include a configuration parameter for indicating a device of the access node subordinate cell to discover a time domain resource, where the configuration parameter indicates the time domain resource by indicating a radio frame and/or a radio subframe position.
When the upper layer configuration parameter indicates the time domain resource by indicating a position of a logical frame and/or a logical subframe, the access node generates a configuration parameter for indicating the time domain resource according to a timing offset (offset) between the logical frame and/or the logical subframe and a radio frame and/or a radio subframe of a subordinate cell, and sends the configuration parameter to the UE through second resource configuration; or,
when the upper layer configuration parameters indicate the time domain resources in a mode of indicating the positions of radio frames and/or radio subframes, the access node generates configuration parameters for indicating the time domain resources according to the positions of the radio frames and/or radio subframes, and sends the configuration parameters to UE through second resource configuration.
When the device discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of radio frames and/or radio subframes, the access nodes generate configuration parameters for indicating the time domain resources according to the deviation (offset) between the timing of the radio frames and/or radio subframes of the subordinated cells of the access nodes and the timing of the radio frames and/or radio subframes of the subordinated cells of the other access nodes, and send the configuration parameters to the UE through second resource configuration; or,
when the device discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of radio frames and/or radio subframes, the access nodes generate configuration parameters for indicating the time domain resources according to the positions of the radio frames and/or radio subframes, and send the configuration parameters to the UE through second resource configuration.
For example, when the upper layer configuration parameter indicates the time domain resource by indicating the position of the logical frame and/or the logical subframe, the access node obtains the position of the radio frame and/or the radio subframe indicating the new time domain resource according to the deviation between the number of the air interface radio frame and/or the radio subframe of the subordinated cell of the access node and the number of the logical frame and/or the logical subframe of the upper layer network entity, that is, generates the configuration parameter for indicating the time domain radio resource, such as the configuration parameter indicating the position of the radio frame and/or the radio subframe, according to the upper layer configuration parameter. For example, in fig. 6, the upper network entity uses the air interface radio frame and/or subframe number of the subordinate cell of eNB2 as a logical frame and/or a logical subframe number, and sets an allocation Period of the device discovery logical frame to the subordinate eNB by using the air interface radio frame and/or subframe number as 4, an allocation Offset is 0, and a device discovery logical subframe bitmap is a 10-bit bitmap whose value is 0000000001; since the number of the air interface radio frame/subframe of the eNB2 is the same as the number of the logical frame/logical subframe configured by the upper layer network entity, after obtaining the upper layer configuration parameter, the eNB2 generates an air interface configuration parameter having the same value as the upper layer configuration parameter; because the deviation between the air interface radio frame/subframe number of the eNB1 and the logical frame/logical subframe number of the upper network entity is 1 radio frame +4 subframe, the eNB1 generates a configuration parameter for indicating a time domain radio resource, such as a radio frame and/or a radio subframe position, according to the upper layer configuration parameter and the deviation, in this example, an allocation Period in the generated time domain radio resource configuration parameter is Period 4, an allocation Offset is Offset 2, and a bitmap value is 0001000000; here, the deviation between the eNB air interface radio frame/subframe number and the logical frame/subframe number of the upper network entity may be sent to the eNB by the upper network entity, for example: bias indicated to eNB1 is 1 radio frame +4 subframes, bias indicated to eNB2 is 0; alternatively, the bias may be obtained by the eNB in other ways, for example, by the eNB synchronizing with the upper network entities.
In this step, the third resource allocation may also include a frequency domain resource allocation parameter, where the frequency domain resource allocation parameter indicates, by indicating the allocated frequency domain resource block and/or the carrier index, that the device discovers the frequency domain resource, and the device discovers the frequency domain resource, where the frequency domain resource is used for device discovery of device-to-device communication performed by the UE.
Step 103: the access node sends the second resource allocation to the UE;
in this way, the UE obtains the radio resource configuration for device discovery through the second resource configuration.
The method also comprises the following steps: the second resource configuration is only used for indicating the configuration of the device discovery resource of the cell subordinate to the other access node, so that the access node sends the second resource configuration and the third resource configuration to the UE, and the UE obtains the device discovery radio resource configuration of the other cell and the device discovery radio resource configuration of the camped cell respectively through the second resource configuration and the third resource configuration.
In order to implement the above method, the present invention further provides an apparatus for discovering devices, as shown in fig. 9, the apparatus including: a first communication module 21, a radio resource allocation module 22, and a second communication module 23; wherein,
the first communication module 21 is configured to receive a device discovery first resource configuration;
the radio resource configuration module 22 is configured to generate a second resource configuration for indicating device discovery resources to the UE according to the first resource configuration;
the second communication module 23 is configured to send the second resource configuration generated by the radio configuration module 22 to the UE;
the device discovery resources are used for device discovery by the UE for device-to-device communication.
The first communication module 21 is configured to receive a first resource configuration sent by an upper network entity, where the first resource configuration includes an upper configuration parameter of a device discovery resource;
correspondingly, the radio resource configuration module 22 is configured to generate a second resource configuration for indicating the device discovery resource according to the upper layer configuration parameter and the radio frame and/or radio subframe timing of the subordinate cell;
or, the first communication module 21 is configured to receive a first resource configuration sent by an upper network entity, where the first resource configuration includes an upper configuration parameter of a device discovery resource;
correspondingly, the radio resource configuration module 22 is configured to generate a second resource configuration for indicating device discovery resources according to the upper layer configuration parameter.
The first communication module 21 is configured to receive a first resource configuration sent by another access node, where the first resource configuration includes a device discovery resource configuration parameter of the other access node;
correspondingly, the radio resource configuration module 22 is configured to generate a second resource configuration for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes and the radio frame and/or radio subframe timing of the subordinate cell;
or, the first communication module 21 is configured to receive a first resource configuration sent by another access node, where the first resource configuration includes a device discovery resource configuration parameter of the other access node;
correspondingly, the radio resource configuration module 22 is configured to generate a second resource configuration for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes.
The second resource configuration is used for indicating the configuration of the device discovery resources of the cells under the control of the other access nodes;
the radio resource configuration module 22 is configured to configure a third resource configuration for indicating the discovery resource of the device in the subordinate cell;
the second communication module 23 is configured to send the second resource configuration and the third resource configuration to the UE.
The device discovery resource is a time domain resource;
the upper layer configuration parameter indicates the time domain resource by indicating the position of a logical frame and/or a logical subframe;
the radio resource configuration module 22 is configured to generate a configuration parameter for indicating the time domain resource according to a timing offset between the logical frame and/or the logical subframe and a radio frame and/or a radio subframe of a subordinate cell;
correspondingly, the second communication module 23 is configured to send the configuration parameter to the UE through a second resource configuration; or,
the upper layer configuration parameters indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the radio resource configuration module 22 is configured to generate a configuration parameter for indicating the time domain resource according to the radio frame and/or the radio subframe position;
correspondingly, the second communication module 23 is configured to send the configuration parameter to the UE through the second resource configuration.
The equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the radio resource configuration module 22 is configured to generate a configuration parameter for indicating the time domain resource according to a deviation between a radio frame and/or a radio subframe timing of a cell subordinate to the radio resource configuration module and a radio frame and/or a radio subframe timing of a cell subordinate to the other access node;
correspondingly, the second communication module 23 is configured to send the configuration parameter to the UE through a second resource configuration; or,
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the radio resource configuration module 22 is configured to generate a configuration parameter for indicating the time domain resource according to the radio frame and/or radio subframe position;
correspondingly, the second communication module 23 is configured to send the configuration parameter to the UE through the second resource configuration.
Based on the foregoing apparatus, the present invention further provides an apparatus for device discovery, where the apparatus may be disposed in an upper network entity or an access node according to the present invention or another access node, as shown in fig. 10, and the apparatus includes: a first resource configuration module 24 and a third communication module 25; wherein,
the first resource configuration module 24 is configured to configure a device discovery resource and generate a first resource configuration indicating the device discovery resource;
the third communication module 25 is configured to send the first resource configuration configured by the first resource configuration module 24 to an access node;
the first resource configuration module 24 is configured to generate a first resource configuration including upper-layer configuration parameters of device discovery resources; or for generating a first resource configuration comprising device discovery resource configuration parameters of other access nodes.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present application is not limited to any specific form of hardware or software combination.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A method for device discovery, the method comprising:
the access node receives the first resource configuration of device discovery, generates a second resource configuration used for indicating device discovery resources to the user equipment according to the first resource configuration of device discovery, and sends the second resource configuration to the user equipment;
the device discovery resource is used for device discovery of device-to-device communication by the user equipment;
the access node receiving a device discovery first resource configuration, generating a second resource configuration for indicating device discovery resources to a user equipment according to the device discovery first resource configuration, comprising:
the first resource configuration is sent by other access nodes, the first resource configuration comprises device discovery resource configuration parameters of the other access nodes or subordinate cells of the other access nodes, and the access nodes generate second resource configurations for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes and wireless frames and/or wireless subframes of the subordinate cells at regular time;
or the first resource configuration is sent by another access node, the first resource configuration includes a device discovery resource configuration parameter of the another access node, and the access node generates a second resource configuration for indicating a device discovery resource according to the device discovery resource configuration parameter of the another access node.
2. The device discovery method of claim 1, wherein the access node receives a device discovery first resource configuration, and wherein generating a second resource configuration for indicating device discovery resources to user devices based on the device discovery first resource configuration comprises:
the first resource configuration is sent by an upper layer network entity, the first resource configuration comprises an upper layer configuration parameter of the device discovery resource, and the access node generates a second resource configuration used for indicating the device discovery resource according to the upper layer configuration parameter and a wireless frame and/or a wireless subframe of a subordinate cell at regular time;
or, the first resource configuration is sent by an upper network entity, the first resource configuration includes an upper configuration parameter of the device discovery resource, and the access node generates, according to the upper configuration parameter, a second resource configuration for indicating the device discovery resource.
3. The device discovery method of claim 2, further comprising:
the second resource configuration is used for indicating the configuration of the device discovery resources of the cells under the control of the other access nodes;
the access node is configured with a third resource configuration for indicating the discovery resources of the self subordinate cell equipment;
and the access node sends the second resource configuration and the third resource configuration to user equipment.
4. The device discovery method of claim 2,
the device discovery resource is a time domain resource;
the upper layer configuration parameters indicate the time domain resources by indicating the positions of logical frames and/or logical subframes, the access node generates configuration parameters for indicating the time domain resources according to the timing deviation of the logical frames and/or logical subframes and radio frames and/or radio subframes of a subordinate cell, and sends the configuration parameters to user equipment through second resource configuration; or,
the upper layer configuration parameters indicate the time domain resources by indicating the positions of wireless frames and/or wireless subframes, the access node generates configuration parameters for indicating the time domain resources according to the positions of the wireless frames and/or wireless subframes, and sends the configuration parameters to user equipment through second resource configuration.
5. The device discovery method of claim 1 or 3,
the device discovery resource is a time domain resource;
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes; the access node generates a configuration parameter for indicating the time domain resource according to the deviation of the radio frame and/or radio subframe timing of the subordinated cell of the access node and the radio frame and/or radio subframe timing of the subordinated cell of the other access node, and sends the configuration parameter to the user equipment through second resource configuration; or,
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes; and the access node generates a configuration parameter for indicating the time domain resource according to the position of the wireless frame and/or the wireless subframe, and sends the configuration parameter to the user equipment through second resource configuration.
6. The device discovery method of claim 3,
the third resource allocation comprises an allocation parameter used for indicating equipment of the access node subordinate cell to discover the time domain resource, and the allocation parameter indicates the time domain resource by indicating a wireless frame and/or a wireless subframe position.
7. The device discovery method of any of claims 1 to 4 or 6, wherein the first resource configuration further comprises frequency domain resource configuration parameters for device discovery;
the frequency domain resource configuration parameter indicates, by indicating the allocated frequency domain resource block and/or carrier index, a device discovery frequency domain resource, which is used for device discovery of device-to-device communication by the user equipment.
8. The device discovery method of claim 3 or 6, wherein said third resource configuration comprises a frequency domain resource configuration parameter indicating device discovery frequency domain resources for device discovery of user equipment for device-to-device communication by indicating allocated frequency domain resource blocks and/or carrier indices.
9. The device discovery method of claim 1 or 2, wherein said other access nodes are access nodes having at least one of the following characteristics:
a main access node belonging to a discovery area with the access node;
an access node adjacent to the access node;
an access node having a communication link with the access node;
an access node configured with device discovery resources.
10. An apparatus for device discovery, the apparatus comprising: the system comprises a first communication module, a wireless resource allocation module and a second communication module; wherein,
the first communication module is configured to receive a device discovery first resource configuration;
the radio resource configuration module is configured to generate a second resource configuration for indicating device discovery resources to a user equipment according to the first resource configuration;
the second communication module is configured to send the second resource configuration generated by the wireless configuration module to the user equipment;
the device discovery resource is used for device discovery of device-to-device communication by the user equipment;
the first communication module is further configured to receive a first resource configuration sent by another access node, where the first resource configuration includes a device discovery resource configuration parameter of the other access node;
correspondingly, the radio resource configuration module is further configured to generate a second resource configuration for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes and the radio frame and/or radio subframe timing of the subordinate cell;
or, the first communication module is further configured to receive a first resource configuration sent by another access node, where the first resource configuration includes a device discovery resource configuration parameter of the other access node;
correspondingly, the radio resource configuration module is further configured to generate a second resource configuration for indicating device discovery resources according to the device discovery resource configuration parameters of the other access nodes.
11. The apparatus of claim 10, wherein the first communication module is configured to receive a first resource configuration sent by an upper network entity, and the first resource configuration comprises an upper configuration parameter of a device discovery resource;
correspondingly, the radio resource configuration module is configured to generate a second resource configuration for indicating the device to discover resources at regular time according to the upper layer configuration parameter and a radio frame and/or a radio subframe of the subordinate cell;
or, the first communication module is configured to receive a first resource configuration sent by an upper network entity, where the first resource configuration includes an upper configuration parameter of a device discovery resource;
correspondingly, the radio resource configuration module is configured to generate a second resource configuration for indicating the device discovery resource according to the upper layer configuration parameter.
12. The apparatus discovery apparatus of claim 10, wherein said second resource configuration is used to indicate configuration of device discovery resources of said other access node subordinate cells;
the radio resource configuration module is further configured to configure a third resource configuration for indicating a discovery resource of a device in a subordinate cell of the radio resource configuration module;
the second communication module is configured to send the second resource configuration and the third resource configuration to a user equipment.
13. The device discovery apparatus of claim 11,
the device discovery resource is a time domain resource;
the upper layer configuration parameter indicates the time domain resource by indicating the position of a logical frame and/or a logical subframe;
the radio resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the timing deviation of the logic frame and/or the logic subframe and a radio frame and/or a radio subframe of a subordinate cell;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration;
or,
the upper layer configuration parameters indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the wireless resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the wireless frame and/or wireless subframe position;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration.
14. The device discovery apparatus of claim 10 or 12,
the device discovery resource is a time domain resource;
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the wireless resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the deviation of the wireless frame and/or wireless subframe timing of the subordinated cell of the wireless resource configuration module and the wireless frame and/or wireless subframe timing of the subordinated cells of other access nodes;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration;
or,
the equipment discovery resource configuration parameters of the other access nodes indicate the time domain resources in a mode of indicating the positions of wireless frames and/or wireless subframes;
the wireless resource configuration module is used for generating configuration parameters for indicating the time domain resources according to the wireless frame and/or wireless subframe position;
correspondingly, the second communication module is configured to send the configuration parameter to the user equipment through a second resource configuration.
15. An apparatus for device discovery, the apparatus comprising: a first resource configuration module and a third communication module; wherein,
the first resource configuration module is configured to configure a device discovery resource and generate a first resource configuration indicating the device discovery resource, where the first resource configuration is sent by another access node, and the first resource configuration includes a device discovery resource configuration parameter of the another access node or a cell subordinate to the another access node;
or, the first resource configuration is sent by other access nodes, and the first resource configuration includes device discovery resource configuration parameters of the other access nodes;
the third communication module is configured to send the first resource configuration configured by the first resource configuration module to an access node.
16. The device discovery apparatus of claim 15, wherein the first resource configuration module is configured to generate a first resource configuration comprising upper layer configuration parameters of device discovery resources; or for generating a first resource configuration comprising device discovery resource configuration parameters of other access nodes.
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| CN107409349B (en) * | 2015-04-10 | 2020-06-19 | 富士通株式会社 | Discovery information transmission method, device and communication system |
| CN104852794B (en) * | 2015-04-21 | 2019-01-15 | 四川大学 | The straight-through method and terminal of LTE terminal is realized based on clock |
| US9894698B2 (en) | 2015-05-13 | 2018-02-13 | Industrial Technology Research Institute | Communication system, base station, user equipment, and discovery method for device-to-device communication |
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