CN104918330B - A kind of D2D sends the selection method and D2D transmissions UE of resource pool - Google Patents
A kind of D2D sends the selection method and D2D transmissions UE of resource pool Download PDFInfo
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- CN104918330B CN104918330B CN201410097698.3A CN201410097698A CN104918330B CN 104918330 B CN104918330 B CN 104918330B CN 201410097698 A CN201410097698 A CN 201410097698A CN 104918330 B CN104918330 B CN 104918330B
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Abstract
The selection method of resource pool is sent the invention discloses a kind of D2D and D2D sends UE.Its method includes：D2D sends UE and sends the reference signal strength of the corresponding information source of resource pool and/or the priority of information source, selection target information source according to D2D；The D2D sends the corresponding D2D of UE selection target information sources and sends resource pool.An embodiment of the present invention provides the selection schemes that D2D sends resource pool.It is selected according to the priority etc. of the reference signal strength of information source and/or information source, ensures that D2D sends UE when moving, suitable D2D can be selected to send the transmission that resource pool carries out D2D Discovery/Communication message.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method for selecting a D2D transmission resource pool and a D2D transmission UE.
Background
In a Long Term Evolution (LTE) system, communication is performed in a network centralized control manner, that is, uplink and downlink data of User Equipment (UE) are transmitted and received under the control of a network. The communication between the UE and the UE is forwarded and controlled by the Network, and no direct communication link exists between the UE and the UE, in this way, data transmission between the UE and the Network may be referred to as Device to Network (D2N) transmission.
With the development of communication technology, Device to Device (D2D) proximity services have been proposed.
In the third generation partnership project (3 GPP), D2D proximity services include the following two broad categories:
proximity service Discovery (D2D Discovery): the UE uses E-UTRA to confirm that another UE is in its vicinity. For example, the user may use the service to find nearby taxis, find friends nearby, etc. using the D2D UE.
Proximity services Communication (D2D Communication): by directly establishing a link between two adjacent UEs, the communication link originally transmitted through the network is converted into a local direct communication link, thereby saving a large amount of bandwidth and network efficiency; or two UEs close to each other, can obtain stable, high-speed and low-cost communication services by using direct link communication. Proximity service communication is typically performed under control or assistance of the network side, and an evolved node b (eNB) may dynamically allocate resources even for UEs performing proximity service communication.
For ease of description, two link types may be defined:
D2D link: the device refers to a link for directly carrying out communication between devices;
D2N link: a link for communication between the device and a network node.
Furthermore, UEs participating in D2D Discovery/Communication are divided into two roles:
D2D sends UE: namely the UE sending the D2D Discovery/Communication message;
D2D receives UE: i.e. the UE receiving the D2D sent the D2D Discovery/Communication message sent by the UE.
For D2D Discovery, currently 3GPP defines two resource allocation types:
type1 (Type 1): that is, the D2D sending UE selects one resource from a D2D Discovery sending resource pool by itself to send the D2D Discovery message;
type2 (Type 2): that is, the D2D sending UE sends the D2D Discovery message on the resource allocated by the network. The Type2 can be divided into two resource allocation types of Type2A and Type2B according to whether the D2D Discovery message sending resources allocated by the network are dynamic or semi-static. For Type2A, the network will send UE dynamic allocation D2DDiscovery message transmission used resource for D2D; for Type2B, the network would send a UE for D2D to semi-statically allocate the resources for D2DDiscovery message transmission.
For a UE in a D2N IDLE (IDLE) state, since it does not establish RRC connection with the base station, when the IDLE UE transmits the UE as D2D, its D2D Discovery resource allocation Type can only select Type 1.
For D2D Communication, currently 3GPP also defines two resource allocation types:
mode1 (Mode 1): i.e., the network schedules the resources used by the D2D transmitting UEs for D2D transmissions.
Mode2 (Mode 2): namely, the D2D sending UE selects one resource from the D2D Communication sending resource pool for sending the D2D Communication message.
For a UE in D2N IDLE state, since it does not establish RRC connection with the base station, when an IDLE UE sends a UE as D2D, its D2D Communication resource allocation type can only select Mode 2.
For the UE in RRC connected state, its resource allocation type of D2D Discovery/Communication is network controlled. However, for the UE in the RRC idle state or the off-network UE, the resource allocation Type of D2D Discovery/Communication cannot be controlled by the network, and for the D2D Discovery scenario, the resource allocation Type of the UE sent by D2D can only select Type 1; for the D2D Communication scenario, the resource allocation type of the D2D sending UE can only select Mode 2. For these UEs, it may receive the D2D transmission resource pool of the serving cell and the D2D transmission resource pool of the neighbor cell at the same time, and even receive the D2D transmission resource pool forwarded by the relay (relay) UE. In this case, it is necessary to consider how the D2D transmitting UE performs D2D transmission resource pool selection.
For a D2D Discovery scene, the D2D sending resource pool refers to a D2D Discovery sending resource pool; for the D2D Communication scenario, the D2D sending resource pool refers to the D2D Communication sending resource pool.
Disclosure of Invention
The invention aims to provide a method for selecting a D2D transmission resource pool and a D2D transmission UE, so as to solve the problem of how to select from a plurality of D2D transmission resource pools.
The purpose of the invention is realized by the following technical scheme:
a method for selecting a D2D sending resource pool comprises the following steps:
D2D sends UE to select target information source according to the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source;
the D2D transmitting UE selects the D2D transmitting resource pool corresponding to the target source.
The embodiment of the invention provides a selection scheme of a D2D sending resource pool. And selecting according to the reference signal strength of the information source and/or the priority of the information source, and the like, so as to ensure that when the D2D sending UE moves, a proper D2D sending resource pool can be selected to send the D2D Discovery/Communication message.
In the embodiment of the present invention, the source for the D2D to send the resource pool may be, but is not limited to, the camping cell, the neighboring cell, and the relay for the D2D to send the UE.
The relay may be, but is not limited to, a relay node in a cellular network, and may also be a relay UE.
The priority of the source may be configured in advance, or the camping cell of the D2D transmitting the UE may transmit the camping cell to the D2D transmitting the UE by broadcasting or the like.
In the embodiment of the present invention, several preferred priority ordering situations are as follows:
camping cell > neighbor cell > relay, or,
camping cell = neighbor cell > relay, or,
resident cell = neighbor cell = relay
Taking the priority relationship between the resident cell and the neighboring cell as an example, the resident cell > the neighboring cell means that the priority of the resident cell is greater than that of the neighboring cell, and the resident cell = the neighboring cell means that the priority of the resident cell is the same as that of the neighboring cell.
The reference signal of the source may be a specific signal that can represent the channel quality of the source, such as a Cell Reference Signal (CRS) of a D2N network, and the like.
In the following, a preferred embodiment of selecting a target source is described by taking detectable sources as a camping cell and a neighboring cell as examples.
The first way of selecting the target source is:
D2D sending UE to judge whether the reference signal strength of the adjacent cell meets the first preset condition;
if the reference signal strength of the adjacent cell meets a first preset condition, D2D sends UE to select the adjacent cell as a target information source;
if the reference signal strength of no neighbor cell meets the first predetermined condition, D2D sends the UE to select the camping cell as the target source.
Wherein, satisfying the first predetermined condition means: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the second threshold value is greater than the first time threshold value.
The value of the first time threshold is determined according to the actual application requirement, and in an extreme case, the value of the first time threshold may be 0.
And the value of the second threshold value is determined according to the actual application requirement. Preferably, the second threshold value selects a corresponding signal strength offset value for the D2D resource.
If the reference signal strength of a plurality of adjacent cells meets a first preset condition, the adjacent cell with the maximum reference signal strength can be selected as a target information source, an adjacent cell can be randomly selected as a target information source, and an adjacent cell can be selected as a target information source according to other rules.
And a second method for selecting the target information source:
D2D sending UE to judge whether the reference signal intensity of the resident cell is larger than a first threshold value;
if the strength of the reference signal of the resident cell is greater than a first threshold value, D2D sends UE to select the resident cell as a target information source;
if the strength of the reference signal of the camping cell is not greater than (i.e. less than or equal to) the first threshold value, D2D sends the UE to select the target source in the above-mentioned manner.
And the value of the first threshold value is determined according to the actual application requirement.
And selecting a target information source in a third mode:
D2D sends UE and selects the source with the highest priority as the target source according to the priority of the source corresponding to the D2D sending resource pool.
If there are multiple sources with the highest priority, one source with the highest priority can be randomly selected as a target source, and a source with the highest reference signal strength can also be selected as a target source.
Selecting a target source in a fourth mode:
D2D sending UE to judge whether the priority of resident cell is larger than the priority of adjacent cell;
if the priority of the resident cell is greater than that of the adjacent cell, D2D sends UE to judge whether there is an adjacent cell whose reference signal strength meets the second preset condition, if so, the adjacent cell whose reference signal strength meets the second preset condition is selected as a target information source, otherwise, the resident cell is selected as the target information source;
if the priority of the resident cell is not greater than the priority of the adjacent cell, D2D sends UE to judge whether there is an adjacent cell whose reference signal strength meets the third preset condition, if so, the adjacent cell whose reference signal strength meets the third preset condition is selected as the target information source, otherwise, the resident cell is selected as the target information source.
The meeting of the second predetermined condition means that the reference signal strength is greater than the reference signal strength of the resident cell, and the duration of the difference value greater than the third threshold exceeds the second time threshold.
The meeting of the third predetermined condition means that the reference signal strength is greater than the reference signal strength of the resident cell, and the duration of the difference value greater than the fourth threshold exceeds the third time threshold.
The values of the second time threshold and the third time threshold are determined according to the actual application requirements, in an extreme case, the value of the second time threshold can be 0, and the value of the third time threshold can also be 0.
And the values of the third threshold value and the fourth threshold value are determined according to the actual application requirements.
Preferably, in practical applications, the third threshold may be set to be greater than the fourth threshold.
For the case that the priority of the resident cell is greater than the priorities of the neighboring cells, if the reference signal strengths of a plurality of neighboring cells meet a second predetermined condition, the neighboring cell with the highest reference signal strength can be selected as the target information source, or one neighboring cell can be randomly selected as the target information source, or one neighboring cell can be selected as the target information source according to other rules.
For the case that the priority of the resident cell is not greater than the priority of the neighboring cells, if the reference signal strengths of a plurality of neighboring cells meet a third predetermined condition, the neighboring cell with the highest reference signal strength can be selected as the target information source, or one neighboring cell can be randomly selected as the target information source, or one neighboring cell can be selected as the target information source according to other rules.
And a fifth mode for selecting the target information source:
D2D sending UE to judge whether the reference signal intensity of the resident cell is larger than a first threshold value;
if the strength of the reference signal of the resident cell is greater than a first threshold value, D2D sends UE to select the resident cell as a target information source;
if the strength of the reference signal of the resident cell is not greater than the first threshold value, D2D sends the UE to select the target source in the above manner.
If the detectable information sources are the residential cell and the relay, the implementation manner of selecting the target information source may refer to the selection manner of each target information source, which is not described herein again.
If the detectable information sources are the residential cell, the neighboring cell and the relay, and the priorities of the neighboring cell and the relay are the same, the implementation manner of selecting the target information source may refer to the selection manner of each target information source, which is not described herein again.
And if the detectable information sources are the resident cell, the adjacent cell and the relay, and the priority of the adjacent cell is greater than that of the relay. The above-described modes one to three can be referred to when selecting the target source. When the target information source is selected, the method can also refer to the fourth mode, but when the priority of the resident cell is greater than that of the adjacent cell, if no adjacent cell meets the conditions, whether a relay with the reference signal intensity of the relay greater than a fifth threshold value compared with the reference signal intensity of the resident cell and the duration time of the relay exceeding a fourth time threshold value exists is judged, if yes, the relay is selected as the target information source, and if not, the resident cell is selected as the target information source; and when the priority of the resident cell is not greater than the priority of the adjacent cell, if no adjacent cell meets the conditions, judging whether a relay with the duration time that the reference signal strength of the relay is greater than a sixth threshold value compared with the reference signal strength of the resident cell and exceeds a fifth time threshold value exists, if so, selecting the relay as a target information source, otherwise, selecting the resident cell as the target information source. The method five described above can also be referred to when selecting the target source.
And if the detectable information sources are the resident cell, the adjacent cell and the relay, and the priority of the relay is higher than that of the adjacent cell. The above-described modes one to three can be referred to when selecting the target source. When the target information source is selected, whether the priority of the resident cell is greater than the priority of the relay or not can be judged firstly, when the priority of the resident cell is greater than the priority of the relay, whether the relay and the adjacent cell meet the preset conditions or not is judged in sequence, if the relay meets the preset conditions, the relay is preferentially selected as the target information source, and only when the relay and the adjacent cell do not meet the preset conditions, the resident cell is selected as the target information source; and when the priority of the resident cell is not greater than the priority of the relay, sequentially judging whether the relay and the adjacent cell meet the preset conditions, if yes, preferentially selecting the relay as a target information source, and selecting the resident cell as the target information source only when the relay and the adjacent cell do not meet the preset conditions. Before judging whether the priority of the resident cell is greater than the priority of the relay, whether the strength of the reference signal of the resident cell is greater than a first threshold value or not can be judged, if so, the resident cell is selected as a target information source, otherwise, whether the priority of the resident cell is greater than the priority of the relay or not is judged, and the target information source is selected according to the process.
Based on the same inventive concept as the method, an embodiment of the present invention further provides a D2D UE, including:
the target information source selection module is used for selecting a target information source according to the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source;
and the resource pool selection module is used for selecting the D2D sending resource pool corresponding to the target information source.
The embodiment of the invention provides a selection scheme of a D2D sending resource pool. And selecting according to the reference signal strength of the information source and/or the priority of the information source, and the like, so as to ensure that when the D2D sending UE moves, a proper D2D sending resource pool can be selected to send the D2D Discovery/Communication message.
Preferably, the target source selection module is configured to:
judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition, wherein the meeting of the first preset condition means that: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the second threshold exceeds the first time threshold;
if the reference signal intensity of an adjacent cell or a relay meets a first preset condition, selecting the adjacent cell or the relay as a target information source;
and if the reference signal strength of no adjacent cell or relay meets the first preset condition, selecting the resident cell as a target source.
Preferably, the second threshold value is a signal strength offset value selected for the D2D resource.
Preferably, when determining whether the strength of the reference signal of the neighboring cell or the relay meets a first predetermined condition, the target signal source selection module is configured to:
judging whether the strength of the reference signal of the resident cell is greater than a first threshold value;
if the reference signal intensity of the resident cell is larger than a first threshold value, selecting the resident cell as a target information source;
and if the reference signal strength of the resident cell is less than or equal to a first threshold value, judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition.
Preferably, the target source selection module is configured to:
and according to the priority of the information source corresponding to the D2D transmission resource pool, selecting the information source with the highest priority as the target information source.
Preferably, the source comprises: a camping cell, a neighboring cell, and a relay.
Preferably, the priority of the source is pre-configured or broadcast by the camping cell.
Preferably: the priority of the resident cell is greater than that of the adjacent cell, and the priority of the adjacent cell is greater than that of the relay; or the priority of the resident cell is equal to the priority of the adjacent cell and is greater than the priority of the relay; or the priority of the resident cell, the adjacent cell and the relay is the same.
Preferably, the target source selection module is configured to:
judging whether the priority of the resident cell is greater than the priorities of the adjacent cell and the relay;
if the priority of the resident cell is greater than the priorities of the adjacent cell and the relay, judging whether the adjacent cell or the relay with the reference signal strength meeting a second preset condition exists, if so, selecting the adjacent cell or the relay with the reference signal strength meeting the second preset condition as a target information source, otherwise, selecting the resident cell as the target information source; the satisfaction of the second predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference value greater than the third threshold exceeds the second time threshold.
And if the priority of the resident cell is less than or equal to the priority of the adjacent cell or the relay, judging whether the adjacent cell or the relay with the reference signal strength meeting a third preset condition exists, if so, selecting the adjacent cell or the relay with the reference signal strength meeting the third preset condition as a target information source, and otherwise, selecting the resident cell as the target information source. The third preset condition is met, that is, the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the fourth threshold exceeds the third time threshold.
Preferably, the third threshold is greater than the fourth threshold.
Preferably, when determining whether the priority of the cell to be camped is greater than the priorities of the neighboring cell and the relay, the target information source selection module is configured to:
judging whether the strength of the reference signal of the resident cell is greater than a first threshold value;
if the reference signal intensity of the resident cell is larger than a first threshold value, selecting the resident cell as a target information source;
and if the reference signal strength of the resident cell is less than or equal to a first threshold value, judging whether the priority of the resident cell is greater than the priorities of the adjacent cell and the relay.
Preferably, the reference signal of the source comprises: a cell reference signal.
Based on the same inventive concept as the method, the embodiment of the invention also provides a D2D sending UE, which comprises a processor and a memory.
The processor is configured to execute a computer program having the following functions: selecting a target information source according to the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source; selecting a D2D sending resource pool corresponding to the target information source;
the memory is configured to store the codes of the computer program described above.
The embodiment of the invention provides a selection scheme of a D2D sending resource pool. And selecting according to the reference signal strength of the information source and/or the priority of the information source, and the like, so as to ensure that when the D2D sending UE moves, a proper D2D sending resource pool can be selected to send the D2D Discovery/Communication message.
Drawings
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a D2D sending UE according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another D2D sending UE according to an embodiment of the present invention.
Detailed Description
The core idea of the embodiment of the invention is as follows: in the D2D Discovery scenario or the D2D Communication scenario, the D2D sending UE determines which source to use for sending the D2D sending resource pool according to the reference signal strength of the source and/or the priority of the source corresponding to the multiple D2D sending resource pools that it can detect.
The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The method for selecting the D2D sending resource pool provided by the embodiment of the present invention is shown in fig. 1, and specifically includes the following operations:
and step 100, D2D sending the UE to select the target source according to the reference signal strength of the source corresponding to the D2D sending resource pool and/or the priority of the source.
Step 110, the D2D sending UE selects the D2D sending resource pool corresponding to the target source.
The embodiment of the invention provides a selection scheme of a D2D sending resource pool. And selecting according to the reference signal strength of the information source and/or the priority of the information source, and the like, so as to ensure that when the D2D sending UE moves, a proper D2D sending resource pool can be selected to send the D2D Discovery/Communication message.
In the embodiment of the present invention, the source for the D2D to send the resource pool may be, but is not limited to, the camping cell, the neighboring cell, and the relay for the D2D to send the UE.
The relay may be, but is not limited to, a relay node in a cellular network, and may also be a relay UE.
The priority of the source may be configured in advance, or the camping cell of the D2D transmitting the UE may transmit the camping cell to the D2D transmitting the UE by broadcasting or the like.
In the embodiment of the present invention, several preferred priority ordering situations are as follows:
camping cell > neighbor cell > relay, or,
camping cell = neighbor cell > relay, or,
resident cell = neighbor cell = relay
Taking the priority relationship between the resident cell and the neighboring cell as an example, the resident cell > the neighboring cell means that the priority of the resident cell is greater than that of the neighboring cell, and the resident cell = the neighboring cell means that the priority of the resident cell is the same as that of the neighboring cell.
The Reference Signal of the source may be a specific Signal that can represent the channel quality of the source, such as a Cell-specific Reference Signal (CRS) of a D2N network, and so on.
The Reference Signal strength may refer to, but is not limited to, Reference Signal Receiving Power (RSRP) of the Reference Signal, or Reference Signal Receiving Quality (RSRQ).
In the following, a preferred embodiment of selecting a target source is described by taking detectable sources as a camping cell and a neighboring cell as examples.
The first way of selecting the target source is:
D2D sending UE to judge whether the reference signal strength of the adjacent cell meets the first preset condition; if the reference signal strength of the adjacent cell meets a first preset condition, D2D sends UE to select the adjacent cell as a target information source; if the reference signal strength of no neighbor cell meets the first predetermined condition, D2D sends the UE to select the camping cell as the target source.
The meeting of the first predetermined condition means that the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the second threshold exceeds the first time threshold.
The value of the first time threshold is determined according to the actual application requirement, and in an extreme case, the value of the first time threshold may be 0.
And the value of the second threshold value is determined according to the actual application requirement. Preferably, the second threshold value selects a corresponding signal strength offset value for the D2D resource.
If the reference signal strength of a plurality of adjacent cells meets a first preset condition, the adjacent cell with the maximum reference signal strength can be selected as a target information source, an adjacent cell can be randomly selected as a target information source, and an adjacent cell can be selected as a target information source according to other rules.
In a D2D Discovery scenario, assuming that a D2D sending UE (hereinafter referred to as UE) in a D2N IDLE state resides in a Cell a (Cell a), an implementation manner of selecting a D2D Discovery sending resource pool according to the above manner is as follows:
the UE performs neighbor Cell measurement, and may determine, but is not limited to, that a neighbor Cell, e.g., Cell B, is detected when detecting CRS, synchronization signals, etc. of the neighbor Cell.
Let CRS signal strength of D2N link of Cell A be SServing_cellCRS signal strength S of D2N link of neighboring Cell Cell Bneighbour_cell_BOffset selects the corresponding signal strength offset value for the D2D resource, then once the CRS signal strengths of Cell B and Cell a satisfy: sneighbour_cell_B≥SServing_cell+ offset, and after a certain time (first time threshold), the UE selects the D2D Discovery transmission resource pool corresponding to Cell B, that is, the D2D Discovery transmission resource pool of Cell B is obtained from the system information of Cell B, and selects the resource used for D2D Discovery message transmission from the resource pool.
The method for selecting the D2D sending resource pool in the D2D Communication scenario may refer to the above process, and is not described herein again.
And a second method for selecting the target information source:
D2D sending UE to judge whether the reference signal intensity of the resident cell is larger than a first threshold value;
if the strength of the reference signal of the resident cell is greater than a first threshold value, D2D sends UE to select the resident cell as a target information source;
if the strength of the reference signal of the camping cell is not greater than (i.e. less than or equal to) the first threshold value, D2D sends the UE to select the target source in the above-mentioned manner.
And the value of the first threshold value is determined according to the actual application requirement.
Under the D2D discovery scenario, assuming that a D2D sending UE (hereinafter referred to as UE) in D2N IDLE state resides in Cell a (Cell a), the implementation manner of selecting a D2D discovery sending resource pool twice in the above manner is as follows:
and if the signal strength (RSRP or RSRQ) of the CRS of the D2N link of the Cell A is larger than a first threshold value, the UE does not perform the measurement of the adjacent cells and selects to use the D2D discovery corresponding to the Cell A to send the resource pool. When the D2D discovery message needs to be sent, the UE selects a resource from the D2D discovery sending resource pool broadcasted by Cell a to send.
As the UE moves, when the CRS signal strength of the D2N link of Cell a is less than or equal to the first threshold, the UE performs neighbor Cell measurement, which may be, but is not limited to, determining that a neighbor Cell, e.g., Cell B, is detected when detecting the CRS, synchronization signals, etc. of the neighbor Cell.
Let CRS signal strength of D2N link of Cell A be SServing_cellCRS signal strength S of D2N link of neighboring Cell Cell Bneighbour_cell_BOffset selects the corresponding signal strength offset value for the D2D resource, then once the CRS signal strengths of Cell B and Cell a satisfy: sneighbour_cell_B≥SServing_cell+ offset, and after a certain time (first time threshold), the UE determines that switching of the D2D discovery sending resource pool is required, that is, releasing the D2 discovery sending of Cell a from the cloud, acquiring the D2D discovery sending resource pool of Cell B from the system information of Cell B, and selecting the resource used for sending the D2D discovery message from the resource pool.
The method for selecting the D2D sending resource pool in the D2D Communication scenario may refer to the above process, and is not described herein again.
And selecting a target information source in a third mode:
D2D sends UE and selects the source with the highest priority as the target source according to the priority of the source corresponding to the D2D sending resource pool.
If there are multiple sources with the highest priority, one source with the highest priority can be randomly selected as a target source, and a source with the highest reference signal strength can also be selected as a target source.
Under the D2D discovery scenario, assuming that a D2D sending UE (hereinafter referred to as UE) in D2N IDLE state resides in Cell a (Cell a), the implementation manner of selecting a D2D discovery sending resource pool in the above manner is as follows:
and if the strength of the CRS of the D2N link of the Cell A is higher than a first threshold value, the UE does not execute the measurement of the adjacent Cell, and when the D2DDiscovery message needs to be sent, the UE selects resources from a D2D Discovery sending resource pool broadcasted by the Cell A for sending.
As the UE moves, the UE starts to perform detection of other synchronization signals when the D2N link CRS signal strength of Cell a is lower than a first threshold value. Assume that a synchronization signal of a relay (relay) UE is detected.
If the source priority is as follows: if the resident cell is greater than relay UE, the UE preferentially selects a D2DDiscovery sending resource pool of the resident cell;
if the source priority is as follows: camping cell = relay UE, then the UE may randomly select D2D Discovery transmission resource pool of one of the sources.
The method for selecting the D2D sending resource pool in the D2D Communication scenario may refer to the above process, and is not described herein again.
Selecting a target source in a fourth mode:
D2D sending UE to judge whether the priority of resident cell is larger than the priority of adjacent cell;
if the priority of the resident cell is greater than that of the adjacent cell, D2D sends UE to judge whether there is an adjacent cell whose reference signal strength meets the second preset condition, if so, the adjacent cell whose reference signal strength meets the second preset condition is selected as a target information source, otherwise, the resident cell is selected as the target information source;
if the priority of the resident cell is not greater than the priority of the adjacent cell, D2D sends UE to judge whether there is an adjacent cell whose reference signal strength meets the third preset condition, if so, the adjacent cell whose reference signal strength meets the third preset condition is selected as the target information source, otherwise, the resident cell is selected as the target information source.
The satisfaction of the second predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference value greater than the third threshold exceeds the second time threshold.
The satisfaction of the third predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference value greater than the fourth threshold exceeds the third time threshold.
The values of the second time threshold and the third time threshold are determined according to the actual application requirements, in an extreme case, the value of the second time threshold can be 0, and the value of the third time threshold can also be 0.
And the values of the third threshold value and the fourth threshold value are determined according to the actual application requirements.
When the priority of the resident cell is the highest, it is desirable to preferentially select the resident cell as the target cell. Preferably, in practical applications, the third threshold may be set to be greater than the fourth threshold.
For the case that the priority of the cell to be camped is greater than the priority of the neighboring cells, if the duration that the reference signal strength of a plurality of neighboring cells is greater than the third threshold exceeds the second time threshold, the neighboring cell with the maximum reference signal strength can be selected as the target information source, or one neighboring cell can be randomly selected as the target information source, or one neighboring cell can be selected as the target information source according to other rules.
For the case that the priority of the cell to be camped is not greater than the priority of the neighboring cells, if the duration of the reference signal strength of a plurality of neighboring cells being greater than the fourth threshold exceeds the third time threshold, the neighboring cell with the maximum reference signal strength can be selected as the target information source, or one neighboring cell can be randomly selected as the target information source, or one neighboring cell can be selected as the target information source according to other rules.
In a D2D Discovery scenario, assuming that a D2D sending UE (hereinafter referred to as UE) in a D2N IDLE state resides in a Cell a (Cell a), the implementation manner of four-selecting a D2D Discovery sending resource pool in the above manner is as follows:
the UE performs neighbor Cell measurement, and may determine, but is not limited to, that a neighbor Cell, e.g., Cell B, is detected when detecting CRS, synchronization signals, etc. of the neighbor Cell.
And the UE judges whether the priority of the Cell A is greater than that of the Cell B or not according to the acquired priority information.
And if the priority of the Cell A is higher than that of the Cell B, selecting the D2D Discovery sending resource pool of the Cell B only when the signal strength of the D2N link CRS of the Cell B is higher than a third threshold value compared with the signal strength of the D2N link CRS of the Cell A and the duration time exceeds a second time threshold value, and otherwise, selecting the D2D Discovery sending resource pool of the Cell A.
If the priority of the Cell a is equal to the priority of the Cell B, only the reference signal strength needs to be considered, that is, when the signal strength of the CRS of the D2N link of the Cell B is greater than the fourth threshold value compared with the signal strength of the CRS of the D2N link of the Cell a, and the duration time exceeds the third time threshold value, the D2D Discovery transmission resource pool of the Cell B is selected, and otherwise, the D2 ddidiscovery transmission resource pool of the C ell a is selected.
Preferably, the third threshold is greater than the fourth threshold.
Preferably, the fourth threshold value is the same as the second threshold value, and the third time threshold value is the same as the first time threshold value.
The method for selecting the D2D sending resource pool in the D2D Communication scenario may refer to the above process, and is not described herein again.
And a fifth mode for selecting the target information source:
D2D sending UE to judge whether the reference signal intensity of the resident cell is larger than a first threshold value;
if the strength of the reference signal of the resident cell is greater than a first threshold value, D2D sends UE to select the resident cell as a target information source;
if the strength of the reference signal of the resident cell is not greater than the first threshold value, D2D sends the UE to select the target source in the above manner.
Under the D2D discovery scenario, assuming that a D2D sending UE (hereinafter referred to as UE) in D2N IDLE state resides in Cell a (Cell a), the implementation manner of five-selecting a D2D discovery sending resource pool in the above manner is as follows:
and if the signal strength (RSRP or RSRQ) of the CRS of the D2N link of the Cell A is larger than a first threshold value, the UE does not perform the measurement of the adjacent cells and selects to use the D2D discovery corresponding to the Cell A to send the resource pool. When the D2D discovery message needs to be sent, the UE selects a resource from the D2D discovery sending resource pool broadcasted by Cell a to send.
As the UE moves, when the CRS signal strength of the D2N link of Cell a is less than or equal to the first threshold, the UE performs neighbor Cell measurement, which may be, but is not limited to, determining that a neighbor Cell, e.g., Cell B, is detected when detecting the CRS, synchronization signals, etc. of the neighbor Cell.
And the UE judges whether the priority of the Cell A is greater than that of the Cell B or not according to the acquired priority information.
And if the priority of the Cell A is higher than that of the Cell B, selecting the D2D Discovery sending resource pool of the Cell B only when the signal strength of the D2N link CRS of the Cell B is higher than a third threshold value compared with the signal strength of the D2N link CRS of the Cell A and the duration time exceeds a second time threshold value, and otherwise, selecting the D2D Discovery sending resource pool of the Cell A.
If the priority of the Cell a is equal to the priority of the Cell B, only the reference signal strength needs to be considered, that is, when the signal strength of the CRS of the D2N link of the Cell B is greater than the fourth threshold value compared with the signal strength of the CRS of the D2N link of the Cell a, and the duration time exceeds the third time threshold value, the D2D Discovery transmission resource pool of the Cell B is selected, and otherwise, the D2 ddidiscovery transmission resource pool of the C ell a is selected.
Preferably, the third threshold is greater than the fourth threshold.
Preferably, the fourth threshold value is the same as the second threshold value, and the third time threshold value is the same as the first time threshold value.
The method for selecting the D2D sending resource pool in the D2D Communication scenario may refer to the above process, and is not described herein again.
If the detectable information sources are the residential cell and the relay, the implementation manner of selecting the target information source may refer to the selection manner of each target information source, which is not described herein again.
If the detectable information sources are the residential cell, the neighboring cell and the relay, and the priorities of the neighboring cell and the relay are the same, the implementation manner of selecting the target information source may refer to the selection manner of each target information source, which is not described herein again.
And if the detectable information sources are the resident cell, the adjacent cell and the relay, and the priority of the adjacent cell is greater than that of the relay. The above-described modes one to three can be referred to when selecting the target source. When the target information source is selected, the method can also refer to the fourth mode, but when the priority of the resident cell is greater than that of the adjacent cell, if no adjacent cell meets the conditions, whether a relay with the reference signal intensity of the relay greater than a fifth threshold value compared with the reference signal intensity of the resident cell and the duration time of the relay exceeding a fourth time threshold value exists is judged, if yes, the relay is selected as the target information source, and if not, the resident cell is selected as the target information source; and when the priority of the resident cell is not greater than the priority of the adjacent cell, if no adjacent cell meets the conditions, judging whether a relay with the duration time that the reference signal strength of the relay is greater than a sixth threshold value compared with the reference signal strength of the resident cell and exceeds a fifth time threshold value exists, if so, selecting the relay as a target information source, otherwise, selecting the resident cell as the target information source. The method five described above can also be referred to when selecting the target source.
And if the detectable information sources are the resident cell, the adjacent cell and the relay, and the priority of the relay is higher than that of the adjacent cell. The above-described modes one to three can be referred to when selecting the target source. When the target information source is selected, whether the priority of the resident cell is greater than the priority of the relay or not can be judged firstly, when the priority of the resident cell is greater than the priority of the relay, whether the relay and the adjacent cell meet the preset conditions or not is judged in sequence, if the relay meets the preset conditions, the relay is preferentially selected as the target information source, and only when the relay and the adjacent cell do not meet the preset conditions, the resident cell is selected as the target information source; and when the priority of the resident cell is not greater than the priority of the relay, sequentially judging whether the relay and the adjacent cell meet the preset conditions, if yes, preferentially selecting the relay as a target information source, and selecting the resident cell as the target information source only when the relay and the adjacent cell do not meet the preset conditions. Before judging whether the priority of the resident cell is greater than the priority of the relay, whether the strength of the reference signal of the resident cell is greater than a first threshold value or not can be judged, if so, the resident cell is selected as a target information source, otherwise, whether the priority of the resident cell is greater than the priority of the relay or not is judged, and the target information source is selected according to the process.
Based on the same inventive concept as the method, an embodiment of the present invention further provides a D2D sending UE, as shown in fig. 2, including:
the target information source selection module 201 is configured to select a target information source according to the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source;
and the resource pool selection module 202 is configured to select a D2D sending resource pool corresponding to the target source.
The embodiment of the invention provides a selection scheme of a D2D sending resource pool. And selecting according to the reference signal strength of the information source and/or the priority of the information source, and the like, so as to ensure that when the D2D sending UE moves, a proper D2D sending resource pool can be selected to send the D2D Discovery/Communication message.
Preferably, the target source selection module 201 is configured to:
judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition, wherein the meeting of the first preset condition means that: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the second threshold exceeds the first time threshold;
if the reference signal intensity of an adjacent cell or a relay meets a first preset condition, selecting the adjacent cell or the relay as a target information source;
and if the reference signal strength of no adjacent cell or relay meets the first preset condition, selecting the resident cell as a target source.
Preferably, the second threshold value is a signal strength offset value selected for the D2D resource.
Preferably, when determining whether the strength of the reference signal of the neighboring cell or the relay meets the first predetermined condition, the target source selection module 201 is configured to:
judging whether the strength of the reference signal of the resident cell is greater than a first threshold value;
if the reference signal intensity of the resident cell is larger than a first threshold value, selecting the resident cell as a target information source;
and if the reference signal strength of the resident cell is less than or equal to a first threshold value, judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition.
Preferably, the target source selection module 201 is configured to:
and according to the priority of the information source corresponding to the D2D transmission resource pool, selecting the information source with the highest priority as the target information source.
Preferably, the source comprises: a camping cell, a neighboring cell, and a relay.
Preferably, the priority of the source is pre-configured or broadcast by the camping cell.
Preferably: the priority of the resident cell is greater than that of the adjacent cell, and the priority of the adjacent cell is greater than that of the relay; or the priority of the resident cell is equal to the priority of the adjacent cell and is greater than the priority of the relay; or the priority of the resident cell, the adjacent cell and the relay is the same.
Preferably, the target source selection module 201 is configured to:
judging whether the priority of the resident cell is greater than the priorities of the adjacent cell and the relay;
if the priority of the resident cell is greater than the priorities of the adjacent cell and the relay, judging whether the adjacent cell or the relay with the reference signal strength meeting a second preset condition exists, if so, selecting the adjacent cell or the relay with the reference signal strength meeting the second preset condition as a target information source, otherwise, selecting the resident cell as the target information source; the satisfaction of the second predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference value greater than the third threshold exceeds the second time threshold.
And if the priority of the resident cell is less than or equal to the priority of the adjacent cell or the relay, judging whether the adjacent cell or the relay with the reference signal strength meeting a third preset condition exists, if so, selecting the adjacent cell or the relay with the reference signal strength meeting the third preset condition as a target information source, and otherwise, selecting the resident cell as the target information source. The third preset condition is met, that is, the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the fourth threshold exceeds the third time threshold.
Preferably, the third threshold is greater than the fourth threshold.
Preferably, when determining whether the priority of the cell to camp on is greater than the priorities of the neighboring cell and the relay, the target information source selecting module 201 is configured to:
judging whether the strength of the reference signal of the resident cell is greater than a first threshold value;
if the reference signal intensity of the resident cell is larger than a first threshold value, selecting the resident cell as a target information source;
and if the reference signal strength of the resident cell is less than or equal to a first threshold value, judging whether the priority of the resident cell is greater than the priorities of the adjacent cell and the relay.
Preferably, the reference signal of the source comprises: a cell reference signal.
Based on the same inventive concept as the method, the embodiment of the present invention further provides a D2D sending UE, as shown in fig. 3, including a processor 301 and a memory 302.
The processor 301 is configured to execute a computer program having the following functions: selecting a target information source according to the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source; selecting a D2D sending resource pool corresponding to the target information source;
the memory 302 is configured to store the codes of the computer programs described above.
The embodiment of the invention provides a selection scheme of a D2D sending resource pool. And selecting according to the reference signal strength of the information source and/or the priority of the information source, and the like, so as to ensure that when the D2D sending UE moves, a proper D2D sending resource pool can be selected to send the D2D Discovery/Communication message.
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 (24)
1. A method for selecting a device-to-device D2D transmission resource pool, comprising:
D2D sending the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source by the user equipment, and selecting a target information source;
and the D2D sending user equipment selects a D2D sending resource pool corresponding to the target source.
2. The method of claim 1, wherein the D2D method for selecting the target source according to the reference signal strength of the source corresponding to the D2D transmission resource pool comprises:
the D2D sending user equipment determines whether there is a neighboring cell or relay reference signal strength meeting a first predetermined condition, where meeting the first predetermined condition refers to: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the second threshold exceeds the first time threshold;
if the reference signal strength of a neighbor cell or a relay meets a first preset condition, the D2D sending user equipment selects the neighbor cell or the relay as a target information source;
if no neighbor cell or relay reference signal strength meets the first predetermined condition, the D2D sending user equipment selects the camping cell as the target source.
3. The method of claim 2, wherein the second threshold value selects a corresponding signal strength offset value for the D2D resource.
4. The method according to claim 2 or 3, wherein the D2D sending the ue determines whether the reference signal strength of the neighbor cell or the relay satisfies a first predetermined condition, including:
the D2D sending user equipment firstly judges whether the reference signal strength of the resident cell is greater than a first threshold value before judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition;
if the strength of the reference signal of the resident cell is greater than a first threshold value, the D2D sending a user equipment to select the resident cell as a target information source;
if the strength of the reference signal of the resident cell is less than or equal to the first threshold value, the D2D sending user equipment determines whether the strength of the reference signal of the neighboring cell or the relay meets the first predetermined condition.
5. The method as claimed in claim 1, wherein the D2D method for the ue to select the target source according to the priority of the source corresponding to the D2D transmission resource pool comprises:
and the D2D sending user equipment selects the source with the highest priority as the target source according to the priority of the source corresponding to the D2D sending resource pool.
6. The method as claimed in claim 1, wherein the D2D method for the transmitting user equipment to select the target source according to the reference signal strength of the source corresponding to the D2D transmitting resource pool and the priority of the source comprises:
the D2D sending user equipment judges whether the priority of the resident cell is greater than the priority of the adjacent cell and the relay;
if the priority of the resident cell is greater than the priorities of the neighboring cell and the relay, the D2D sending user equipment judges whether the neighboring cell or the relay with the reference signal strength meeting a second preset condition exists, if so, the neighboring cell or the relay meeting the second preset condition is selected as a target information source, otherwise, the resident cell is selected as the target information source; the satisfaction of the second predetermined condition means: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than a third threshold value exceeds a second time threshold value;
if the priority of the resident cell is less than or equal to the priority of the adjacent cell or the relay, the D2D sending user equipment judges whether the adjacent cell or the relay with the reference signal strength meeting a third preset condition exists, if so, the adjacent cell or the relay meeting the third preset condition is selected as a target information source, otherwise, the resident cell is selected as the target information source; satisfying the third predetermined condition means: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the fourth threshold exceeds the third time threshold.
7. The method of claim 6, wherein the third threshold value is greater than the fourth threshold value.
8. The method according to claim 6 or 7, wherein the D2D sending the ue determining whether the priority of the camped cell is higher than the priorities of the neighbor cell and the relay includes:
the D2D sending user equipment judges whether the reference signal strength of the resident cell is greater than a first threshold value;
if the strength of the reference signal of the resident cell is greater than a first threshold value, the D2D sends the user equipment to select the resident cell as a target information source;
if the reference signal strength of the resident cell is less than or equal to the first threshold value, the D2D sending user equipment determines whether the priority of the resident cell is greater than the priorities of the neighboring cell and the relay.
9. The method according to any one of claims 1 to 3 and 5 to 7, wherein the reference signal of the source comprises: a cell reference signal.
10. The method according to any one of claims 1 to 3 and 5 to 7, wherein the source comprises: a camping cell, a neighboring cell, and a relay.
11. The method of claim 10, wherein the priority of the source is pre-configured or cell-camped.
12. The method of claim 10, wherein:
the priority of the resident cell is greater than that of the adjacent cell, and the priority of the adjacent cell is greater than that of the relay; or,
the priority of the resident cell is equal to the priority of the adjacent cell and is greater than the priority of the relay; or,
the priority of the resident cell, the adjacent cell and the relay is the same.
13. A D2D sending user equipment, comprising:
the target information source selection module is used for selecting a target information source according to the reference signal strength of the information source corresponding to the D2D sending resource pool and/or the priority of the information source;
and the resource pool selection module is used for selecting the D2D sending resource pool corresponding to the target information source.
14. The D2D sending user equipment as claimed in claim 13, wherein the target source selection module is configured to:
judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition, wherein the meeting of the first preset condition means that: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than the second threshold exceeds the first time threshold;
if the reference signal intensity of an adjacent cell or a relay meets a first preset condition, selecting the adjacent cell or the relay as a target information source;
and if the reference signal strength of no adjacent cell or relay meets the first set condition, selecting the resident cell as the target information source.
15. The D2D sending user equipment of claim 14, wherein the second threshold is a signal strength offset value corresponding to D2D resource selection.
16. The D2D sending user equipment according to claim 14 or 15, wherein the target source selection module is configured to, when determining whether there is a neighboring cell or relay reference signal strength meeting a first predetermined condition:
judging whether the strength of the reference signal of the resident cell is greater than a first threshold value;
if the reference signal intensity of the resident cell is larger than a first threshold value, selecting the resident cell as a target information source;
and if the reference signal strength of the resident cell is less than or equal to a first threshold value, judging whether the reference signal strength of the adjacent cell or the relay meets a first preset condition.
17. The D2D sending user equipment as claimed in claim 13, wherein the target source selection module is configured to:
and according to the priority of the information source corresponding to the D2D transmission resource pool, selecting the information source with the highest priority as the target information source.
18. The D2D sending user equipment as claimed in claim 13, wherein the target source selection module is configured to:
judging whether the priority of the resident cell is greater than the priorities of the adjacent cell and the relay;
if the priority of the resident cell is greater than the priorities of the adjacent cell and the relay, judging whether the adjacent cell or the relay with the reference signal strength meeting a second preset condition exists, if so, selecting the adjacent cell or the relay with the reference signal strength meeting the second preset condition as a target information source, otherwise, selecting the resident cell as the target information source; satisfaction of the second predetermined condition indicates: the reference signal strength is greater than that of the resident cell, and the duration of the difference value greater than a third threshold value exceeds a second time threshold value;
if the priority of the resident cell is less than or equal to the priority of the adjacent cell or the relay, judging whether the reference signal strength meets a third preset condition, if so, selecting the adjacent cell or the relay with the reference signal strength meeting the third preset condition as a target information source, otherwise, selecting the resident cell as the target information source; the satisfaction of the third predetermined condition means that the reference signal strength is greater than the camping cell reference signal strength, and the duration of the difference value greater than the fourth threshold exceeds the third time threshold.
19. The D2D sending user equipment as claimed in claim 18, wherein the third threshold is greater than the fourth threshold.
20. The D2D sending user equipment of claim 18 or 19, wherein when determining whether the priority of the camping cell is greater than the priorities of the neighboring cells and the relay, the target source selection module is configured to:
judging whether the strength of the reference signal of the resident cell is greater than a first threshold value;
if the reference signal intensity of the resident cell is larger than a first threshold value, selecting the resident cell as a target information source;
and if the reference signal strength of the resident cell is less than or equal to a first threshold value, judging whether the priority of the resident cell is greater than the priorities of the adjacent cell and the relay.
21. The D2D sending user equipment as claimed in any one of claims 13-15 and 17-19, wherein the reference signal of the source comprises: a cell reference signal.
22. The D2D sending user equipment as claimed in any one of claims 13-15 and 17-19, wherein the source comprises: a camping cell, a neighboring cell, and a relay.
23. The D2D sending user equipment as claimed in claim 22, wherein the priority of the source is pre-configured or cell camping broadcast.
24. The D2D sending user equipment as claimed in claim 22, wherein:
the priority of the resident cell is greater than that of the adjacent cell, and the priority of the adjacent cell is greater than that of the relay; or,
the priority of the resident cell is equal to the priority of the adjacent cell and is greater than the priority of the relay; or,
the priority of the resident cell, the adjacent cell and the relay is the same.
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| PCT/CN2015/073606 WO2015135431A1 (en) | 2014-03-14 | 2015-03-04 | Method for selecting d2d transmission resource pool and d2d transmission ue |
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| CN105307234A (en) * | 2015-11-05 | 2016-02-03 | 东莞酷派软件技术有限公司 | Access control method and device for remote terminal, terminal and base station |
| WO2017117712A1 (en) * | 2016-01-05 | 2017-07-13 | 富士通株式会社 | Information transmission method, apparatus and system |
| CN108781434A (en) * | 2016-04-01 | 2018-11-09 | 富士通株式会社 | Resource allocation methods, device and communication system |
| TWI633803B (en) * | 2016-10-07 | 2018-08-21 | 宏碁股份有限公司 | Method of performing device-to-device communication and related communication system |
| CN111988772A (en) * | 2019-05-23 | 2020-11-24 | 北京邮电大学 | Terminal discovery method and device |
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| CN103037450A (en) * | 2011-09-29 | 2013-04-10 | 华为技术有限公司 | Method and device for communication mode switching |
| CN103037448A (en) * | 2011-09-30 | 2013-04-10 | 华为技术有限公司 | Content publishing method and user device |
| CN102547871A (en) * | 2012-02-07 | 2012-07-04 | 华为技术有限公司 | Method and device for consulting resource in D2D (Device To Device) communication |
| CN103634852A (en) * | 2012-08-28 | 2014-03-12 | 华为技术有限公司 | Resource negotiation method, devices and system of device-to-device (D2D) communication |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015135431A1 (en) | 2015-09-17 |
| CN104918330A (en) | 2015-09-16 |
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