CN106488563B - Resource selection method and device - Google Patents
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- CN106488563B CN106488563B CN201510549328.3A CN201510549328A CN106488563B CN 106488563 B CN106488563 B CN 106488563B CN 201510549328 A CN201510549328 A CN 201510549328A CN 106488563 B CN106488563 B CN 106488563B
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Abstract
The invention discloses a resource selection method and a resource selection device, which are used for selecting two resources when a node selects resources each time, wherein one resource is used for transmitting a service packet, and the other resource is used for indicating the resource for transmitting the service packet, so that other nodes can select different resources to occupy according to the indication when receiving the indication, thereby avoiding resource collision as much as possible, avoiding frequent resource reselection and improving the reliability of a system. The invention provides a resource selection method, which comprises the following steps: determining resources required to be selected for transmitting a service packet; selecting a first resource and a second resource, wherein the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, and the resource is a time slot or a time frequency block.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a resource selection method and apparatus.
Background
In the cellular-assisted distributed resource allocation algorithm, the existing time slot selection mechanism still has higher collision probability, and the system performance is reduced.
A resource allocation algorithm for implicit reservation assisted by a base station in the prior art includes: a resource competition method includes that User Equipment (UE) needs to monitor a channel for one period before sending signals for the first time, if certain logic resource in one period is found not to be used by other UE, competitive occupation can be conducted on the same logic resource position in the next period, once competition is successful, the same logic resource is continuously used in each subsequent period to send information until the resource is collided again, namely, under the condition that no extra service sending requirement exists before the resource is released by collision, other resources do not need to be selected.
The resource conflict detection and alarm scheme comprises the following steps: even if the above resource competition scheme is adopted, since the cart is mobile, even if two UEs that initially use the same logical resource do not affect each other, they may affect each other as the cart moves.
The solution is as follows:
puncturing in Resource Blocks (RBs) for listening. Since there is a redundancy of 2 RBs out of the 11 RBs originally sent by each UE, there is no problem even if 1 whole RB is randomly turned off for listening at a time.
Due to the hidden node problem, a collision detection mechanism needs to be introduced.
The base station or other UE listens, if the energy on a certain logic resource is heard but the solution is not obtained, a reminding signal is sent. The reminder is suggested to be sent out in a special frame (special frame). The special frame is divided into an uplink time slot and a downlink time slot. A fixed one-to-one mapping is established between the device-to-device (D2D) logical resource universe and each resource in the special frame. If a UE finds a collision (with high energy but no decoding) in a D2D logic resource, a collision alarm signal can be sent on the corresponding uplink collision alarm Resource (RE), the Timing Advance (TA) of the collision alarm signal is determined according to the received signal power of the evolved base station (eNb), and the transmission power is inversely proportional to the received signal power of the eNb. The eNb can then determine whether there is a conflict for this logical resource according to the received power on each conflict alert resource, and how many receiving UEs are affected by this conflict.
The eNb can then determine which logical resource the conflict needs to be resolved according to the received conflict alarm signal, and then make an indication in the downlink subframe of the special frame.
However, when a node selects a timeslot, two nodes that monitor simultaneously, or two nodes that are still in the timeslot selection process, do not yet send information on the selected timeslot, and it is easy to select the same timeslot as their own occupied timeslot, which causes resource collision and further frequently performs resource reselection, which affects the reliability of the system.
Disclosure of Invention
The embodiment of the invention provides a resource selection method and a resource selection device, which are used for selecting two resources when a node selects resources each time, wherein one resource is used for transmitting a service packet, and the other resource is used for indicating the resource for transmitting the service packet, so that other nodes can select different resources to occupy according to the indication when receiving the indication, thereby avoiding resource collision as much as possible, avoiding frequent resource reselection and improving the reliability of a system.
The resource selection method provided by the embodiment of the invention comprises the following steps:
determining resources required to be selected for transmitting a service packet;
selecting a first resource and a second resource, wherein the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, and the resource is a time slot or a time frequency block.
Determining the resources required to be selected for transmitting the service packet by the method; the method comprises the steps of selecting a first resource and a second resource, wherein the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, the resource is a time slot or a time frequency block, so that two resources, namely the first resource and the second resource, are selected when a node selects the resource each time, the second resource is used for transmitting the service packet, the first resource is used for indicating the second resource for transmitting the service packet, other nodes can determine that the second resource is occupied according to the indication when receiving the indication of the first resource, the resource different from the second resource is selected for occupation, resource collision is avoided as much as possible, frequent resource reselection is avoided, and the reliability of a system is improved.
Preferably, the method further comprises:
sending indication information for indicating that the second resource transmission service packet needs to be occupied at the first resource;
and sending the service packet at the second resource.
Preferably, only before the service packet is sent after the current resource selection and the second resource is occupied for the first time, the first resource sends the indication information for indicating that the service packet needs to be occupied for transmitting the second resource.
Preferably, after the second resource is occupied for the first time after the current resource selection to send the service packet successfully, the first resource is released.
Another resource selection method provided in the embodiments of the present invention includes:
receiving indication information that an external node needs to occupy a second resource transmission service packet at a first resource;
and in the process of selecting the resources needing to be occupied, selecting or reselecting the resources needing to be occupied by the local node according to the indication information, wherein the resources are time slots or time frequency blocks.
Preferably, the local node needs to occupy a different resource from the second resource.
The resource selection device provided by the embodiment of the invention comprises:
a determining unit, configured to determine that a resource for transmitting a service packet needs to be selected;
the device comprises a selecting unit, a transmitting unit and a receiving unit, wherein the selecting unit is used for selecting a first resource and a second resource, the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, and the resource is a time slot or a time frequency block.
Preferably, the selecting unit is further configured to:
sending indication information for indicating that the second resource transmission service packet needs to be occupied at the first resource;
and sending the service packet at the second resource.
Preferably, the selecting unit sends, in the first resource, indication information for indicating that the second resource needs to be occupied to transmit the service packet only before the second resource is occupied for the first time after the current resource selection to transmit the service packet.
Preferably, the selection unit is further configured to: and after the second resource is occupied for the first time after the resource selection to successfully send the service packet, releasing the first resource.
Another resource selection apparatus provided in an embodiment of the present invention includes:
a receiving unit, configured to receive, at a first resource, indication information that an external node needs to occupy a second resource for transmitting a service packet;
and the selecting unit is used for selecting or reselecting the resource required to be occupied by the local node according to the indication information in the process of selecting the resource required to be occupied, wherein the resource is a time slot or a time frequency block.
Preferably, the local node needs to occupy a different resource from the second resource.
Preferably, the apparatus further includes a determining unit and a selecting unit in the first resource selecting apparatus provided in the embodiment of the present invention.
Drawings
Fig. 1 is a schematic flowchart of a resource selection method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of another resource selection method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a resource selection apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another resource selection apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third resource selection apparatus according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a resource selection method and a resource selection device, which are used for selecting two resources when a node selects resources each time, wherein one resource is used for transmitting a service packet, and the other resource is used for indicating the resource for transmitting the service packet, so that other nodes can select different resources to occupy according to the indication when receiving the indication, thereby avoiding resource collision as much as possible, avoiding frequent resource reselection and improving the reliability of a system.
Referring to fig. 1, a resource selection method provided in an embodiment of the present invention includes:
s101, determining resources required to be selected for transmitting a service packet;
s102, selecting a first resource and a second resource, wherein the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, and the resource is a time slot or a time frequency block.
Preferably, the method further comprises:
sending indication information for indicating that the second resource transmission service packet needs to be occupied at the first resource;
and sending the service packet at the second resource.
Preferably, only before the service packet is sent after the current resource selection and the second resource is occupied for the first time, the first resource sends the indication information for indicating that the service packet needs to be occupied for transmitting the second resource.
Preferably, after the second resource is occupied for the first time after the current resource selection to send the service packet successfully, the first resource is released.
It should be noted that, in the embodiment of the present invention, for each resource selection, before the second resource is occupied for the first time after the resource selection to send the service packet, instead of before the second resource is occupied for the first time after the node is turned on to send the service packet, the first resource sends the indication information for indicating that the second resource needs to be occupied to transmit the service packet. And sending indication information for indicating that the second resource needs to be occupied to transmit the service packet through the first resource before the first resource is occupied to transmit the service packet through the second resource in each resource selection after the resource collision reselection.
From the perspective of the node, once the resource selection is completed and the second resource is successfully sent (which is equivalent to the successful selection of the self-occupied resource of the node), the node does not use the first resource, that is, uses the first resource once.
The time interval between the first resource and the second resource is a preset value. The preset value may be determined according to actual needs, but in terms of time, the distance between the first resource and the second resource may be as far as possible, but there is no requirement that the minimum requirement is decoding processing delay, which is related to the chip, the current good chip does not need delay and can be solved in the current subframe, and the less good chip may need an interval of 1 to 2 time slots.
Referring to fig. 2, another resource selection method provided in the embodiment of the present invention includes:
s201, receiving indication information that an external node needs to occupy a second resource transmission service packet at a first resource;
s202, in the process of selecting the resources needing to be occupied, selecting or reselecting the resources needing to be occupied by the local node according to the indication information, wherein the resources are time slots or time frequency blocks.
Preferably, the local node needs to occupy a different resource from the second resource.
The resource described in the embodiments of the present invention may be, for example, a time slot, where for TDM, a minimum unit of the resource is one entire time slot resource, and for FDM, a plurality of nodes are frequency division multiplexed with one time slot resource, and in this way, the minimum unit of the resource is not a time slot but a time frequency block.
That is, when a slot is specifically explained as the resource:
after receiving the indication information sent by the external node, the node needs to make some internal judgments according to the indication information: if the node has also selected the second time slot selected by the external node as the second time slot of the node, no matter whether the first time slot selected by the node has been sent or not, the resource reselection is performed, that is, the resource of the second time slot is released in advance, if the first time slot has been sent, the node also needs to reselect to resend once again; if the node has not selected the resource, that is, the first time slot and the second time slot have not been selected, the first time slot and the second time slot selected by the node need to be different from the second time slot indicated in the indication information.
In the embodiment of the present invention, when a node selects a timeslot (in a scenario where initial access and timeslot collision occur), 2 timeslots are selected and recorded as a first timeslot and a second timeslot inside respectively: the time slots are divided by the length from the current moment, the time slot closer to the current moment is a first time slot, and the other time slot is a second time slot.
Only information representing the occupation information of the second time slot is sent on the first time slot; and transmitting the service packet on the second time slot. After the time slot selection is completed, the service packet is transmitted only on the second time slot, and the first time slot is not maintained.
In addition, the first time slot is also not characterized from the node reception perspective. When receiving the indication information sent by the first time slot, the default is equivalent to receiving the time slot occupied by the second time slot, namely, the first time slot is treated as a special time slot.
The first slot is not considered as a valid reservation slot, and the default is that the first slot selected each time only occupies 1 time.
In this way, no special control channel is required to be set, and the reliability and flexibility of the time slot selection are obtained with a single overhead. I.e. the probability of a slot collision is reduced when the slot selection (initial access and collision) takes place. The probability of a time slot collision is determined from: selecting one slot for collision reduces to selecting 2 slots for collision.
The technical scheme provided by the embodiment of the invention is effective for optimizing all scenes, and can further specifically comprise the following steps:
the first time slot collides, and the second time slot does not collide; has no influence on the system performance.
The first time slot is not collided, and the second time slot is collided; a slot collision can be found early.
The first time slot and the second time slot are in time slot collision; some problems can be solved. The time slot collision is discovered through differential receiving and feedback of the nodes.
No slot collision occurs for both the first and second slots.
One specific example is as follows.
Assuming node a and node B select a time slot, node C has maintained time slot 7.
The node A selects two time slots, namely a time slot 3 and a time slot 6, wherein the time slot 3 is used as a first time slot, and the time slot 6 is used as a second time slot;
the node B selects two time slots: slot 4 and slot 6, with slot 4 being the first slot and slot 6 being the second slot.
For slot 3:
node a sends an indication message on the first time slot, i.e. time slot 3, indicating that its occupied time slot is time slot 6, and intends to send specific traffic information on the second time slot, i.e. time slot 6.
After receiving the indication information sent by the node a on the time slot 3, the node C updates the time slot 6 to be occupied by the node a. No processing is done for slot 3.
After receiving the message sent by node a, node B knows that node a selects the same timeslot as node a's own timeslot. The time slot collision of the user can be known in advance, so that other time slots can be selected in advance, and the time slot collision is avoided. E.g., reselect slot resources, and transmit a traffic packet on slot 8.
By the next cycle, node a and node B transmit their traffic only in the self-occupied slots, i.e., slot 6 and slot 8, respectively.
For slot 4:
node B sends an indication message in the first time slot, time slot 4, indicating that it will occupy time slot 8.
The node receiving the indication records that the node B occupies the time slot 8.
For slot 6:
node a transmits traffic data on time slot 6.
The receiving node does not update the internal slot occupancy state of slot 6.
For slot 8:
the node B transmits traffic data on time slot 8.
The receiving node does not update the internal slot occupancy state of slot 8.
Corresponding to the above method, referring to fig. 3, a resource selection apparatus provided in an embodiment of the present invention includes:
a determining unit 11, configured to determine that a resource for transmitting a service packet needs to be selected;
a selecting unit 12, configured to select a first resource and a second resource, where the second resource is used to transmit a service packet, and the first resource is used to indicate that the second resource needs to be occupied to transmit the service packet, where the resource is a time slot or a time frequency block.
Preferably, the selecting unit is further configured to:
sending indication information for indicating that the second resource transmission service packet needs to be occupied at the first resource;
and sending the service packet at the second resource.
Preferably, the selecting unit sends, in the first resource, indication information for indicating that the second resource needs to be occupied to transmit the service packet only before the second resource is occupied for the first time after the current resource selection to transmit the service packet.
Preferably, the selection unit is further configured to: and after the second resource is occupied for the first time after the resource selection to successfully send the service packet, releasing the first resource.
Referring to fig. 4, another resource selection apparatus provided in the embodiment of the present invention includes:
a receiving unit 21, configured to receive, at a first resource, indication information that an external node needs to occupy a second resource transmission service packet;
and a selecting unit 22, configured to select or reselect a resource that needs to be occupied by the local node according to the indication information in a process of selecting the resource that needs to be occupied, where the resource is a time slot or a time frequency block.
Preferably, the local node needs to occupy a different resource from the second resource.
Preferably, the apparatus further includes a determining unit 11 and a selecting unit 12 in the first resource selecting apparatus provided in the embodiment of the present invention. That is, the present apparatus may have the function of the first medium resource selecting apparatus.
Referring to fig. 5, a third resource selection apparatus provided in the embodiment of the present invention includes:
the processor 600, which is used to read the program in the memory 620, executes the following processes:
determining resources required to be selected for transmitting a service packet;
selecting a first resource and a second resource, wherein the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, and the resource is a time slot or a time frequency block.
Preferably, the processor 600 is further configured to:
sending, by the transceiver 610, indication information for indicating that the second resource needs to be occupied for transmitting the service packet in the first resource;
the service packet is transmitted on the second resource via transceiver 610.
Preferably, the processor 600 sends, through the transceiver 610, the indication information for indicating that the second resource needs to be occupied to transmit the service packet, on the first resource only before the second resource is occupied for the first time after the current resource selection to send the service packet.
Preferably, the processor 600 is further configured to: and after the second resource is occupied for the first time after the resource selection to successfully send the service packet, releasing the first resource.
Additionally, processor 600 is further configured to:
receiving indication information that an external node needs to occupy a second resource transmission service packet at a first resource through a transceiver 610;
and in the process of selecting the resources needing to be occupied, selecting or reselecting the resources needing to be occupied by the local node according to the indication information, wherein the resources are time slots or time frequency blocks.
Preferably, the local node needs to occupy a different resource from the second resource.
A transceiver 610 for receiving and transmitting data under the control of the processor 600.
Wherein in fig. 5, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 600, and various circuits of memory, represented by memory 620, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 630 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.
In summary, in the embodiments of the present invention, when the node performs slot selection, one more slot is selected to represent the reserved slot of the node, and the temporary slot is used once. Therefore, under the condition of not introducing excessive expenses, the embodiment of the invention enables the node to know whether the time slot collision is about to occur in advance, thereby selecting other resources, avoiding the occurrence of resource collision and improving the system performance.
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, 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.
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 (7)
1. A method for resource selection, the method comprising:
determining resources required to be selected for transmitting a service packet;
selecting a first resource and a second resource, wherein the second resource is used for transmitting a service packet, the first resource is used for indicating that the second resource needs to be occupied to transmit the service packet, and the resource is a time slot or a time frequency block;
the method further comprises the following steps:
sending indication information for indicating that the second resource transmission service packet needs to be occupied at the first resource;
sending a service packet at the second resource;
sending indication information for indicating that a second resource transmission service packet needs to be occupied at the first resource only before the second resource is occupied for the first time after the current resource selection to send the service packet;
the method further comprises the following steps: and after the second resource is occupied for the first time after the resource selection to successfully send the service packet, releasing the first resource.
2. A method for resource selection, the method comprising:
receiving indication information that an external node needs to occupy a second resource transmission service packet at a first resource;
in the process of selecting the resources needing to be occupied, selecting or reselecting the resources needing to be occupied by the local node according to the indication information, wherein the resources are time slots or time frequency blocks;
after the external node sends the indication information, a service packet is sent in the second resource; the external node sends the indication information on the first resource only before occupying a second resource for sending a service packet for the first time after the current resource selection; and after the external node occupies a second resource for the first time after the resource selection and successfully sends the service packet, releasing the first resource.
3. The method of claim 2, wherein the local node needs to occupy a different resource than the second resource.
4. A resource selection apparatus, comprising:
a determining unit, configured to determine that a resource for transmitting a service packet needs to be selected;
a selecting unit, configured to select a first resource and a second resource, where the second resource is used to transmit a service packet, and the first resource is used to indicate that the second resource needs to be occupied to transmit the service packet, where the resource is a time slot or a time frequency block;
the selection unit is further configured to:
sending indication information for indicating that the second resource transmission service packet needs to be occupied at the first resource;
sending a service packet at the second resource;
the selection unit sends indication information for indicating that a second resource transmission service packet needs to be occupied on the first resource only before the second resource transmission service packet is occupied for the first time after the current resource selection;
the selection unit is further configured to: and after the second resource is occupied for the first time after the resource selection to successfully send the service packet, releasing the first resource.
5. A resource selection apparatus, comprising:
a receiving unit, configured to receive, at a first resource, indication information that an external node needs to occupy a second resource for transmitting a service packet;
a selecting unit, configured to select or reselect a resource that needs to be occupied by a local node according to the indication information in a process of selecting the resource that needs to be occupied, where the resource is a time slot or a time frequency block;
after the external node sends the indication information, a service packet is sent in the second resource; the external node sends the indication information on the first resource only before occupying a second resource for sending a service packet for the first time after the current resource selection; and after the external node occupies a second resource for the first time after the resource selection and successfully sends the service packet, releasing the first resource.
6. The apparatus of claim 5, wherein the local node needs to occupy a different resource than the second resource.
7. The device according to claim 5 or 6, characterized in that it further comprises a determining unit and a selecting unit in the device according to claim 4.
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| CN109152008A (en) * | 2017-06-15 | 2019-01-04 | 华为技术有限公司 | A kind of message method and device |
| CN110266449A (en) * | 2018-03-12 | 2019-09-20 | 华为技术有限公司 | A kind of communication means and communication equipment |
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| CN104684092B (en) * | 2013-12-03 | 2018-03-16 | 富士通株式会社 | Slot allocation method, device and time division multiple acess tree network |
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| US20150235269A1 (en) * | 2014-02-14 | 2015-08-20 | Google Inc. | Methods and systems for reserving a particular third-party content slot of an information resource of a content publisher |
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