CN107682930B

CN107682930B - Resource selection method and device

Info

Publication number: CN107682930B
Application number: CN201610624876.2A
Authority: CN
Inventors: 赵毅; 赵锐; 房家奕; 周海军; 林琳
Original assignee: Datang Telecom Technology Industry Holding Co ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-08-02
Filing date: 2016-08-02
Publication date: 2020-10-30
Anticipated expiration: 2036-08-02
Also published as: CN107682930A

Abstract

The invention provides a resource selection method and a device, wherein the resource selection method comprises the following steps: selecting an initial transmission resource and a resource for carrying control information of the initial transmission resource for a first service data packet; before the resource of the control information arrives, detecting whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal; if collision occurs, before the resource of the control information arrives, selecting the initial transmission resource for the first service data packet again and/or the resource used for carrying the control information of the initial transmission resource and detecting whether the newly selected initial transmission resource collides with the transmission resource of the second service data packet of the second terminal; if no collision occurs, before the resource of the control information arrives, the transmission resource of the first service data packet is determined, so that the probability of resource reselection caused by resource collision is reduced, and the electric quantity consumption caused by resource reselection is reduced.

Description

Resource selection method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a resource selection method and apparatus.

Background

Currently, in the LTE-based V2V technology, it is determined to adopt a method based on LTE D2D for improvement, where control information (i.e., scheduling assignment information) and Data information (Data) are transmitted through different channels, and a receiving end first receives the Data information according to the received control information by detecting the SA information carried in the control channel.

In LTE-based V2V technology, there are two modes of resource selection:

the first mode is a mode in which the UE autonomously selects resources, as shown in fig. 1. In a mode of autonomously selecting resources by the UE, the UE needs to sense the occupation of resources to select the resources, and generally speaking, one of the two modes is to obtain data resource information to be occupied by data transmission of other UEs in the future according to received SA information of other UEs, so as to select resources to be transmitted from unoccupied data resources; the other method is to directly detect the energy of the resources for data transmission, if the energy is higher than a certain threshold, the corresponding data resources are considered to be occupied, and on the basis, the situation that the data resources are occupied in the future is determined by combining the time or periodicity occupied by the data transmission, and the unoccupied data resources are selected for data transmission.

The second mode is a base station assisted resource selection mode, where the base station may schedule V2V communications through a downlink control channel (PDCCH/EPDCCH) when the vehicle is within network coverage, as shown in fig. 2. In this case, the base station instructs the transmission vehicle of the resource location of transmitting the SA and data by transmitting a V2V grant message. Briefly, as shown in fig. 3, the UE needs to construct resource occupation situations of N future subframes according to detection or energy detection of the SA and time or period of continuously occupying resources by data transmission, so as to select idle time-frequency domain resources from the N future subframes for transmission. The figure identifies the situation that the UE1, UE2 and UE3 occupy data resources, and the UE4 can select its own transmission resources from the idle resources if data transmission is required. Or further, it may be known by means of energy detection which subframes have the smallest interference, so as to select the subframe with the smallest interference, for example, in fig. 3, the UE4 may select idle frequency domain resources in the first subframe and the last subframe for data transmission; or it is known which subframes have larger power and have idle frequency domain resources, the idle frequency domain resources can be selected from the subframes having larger power and idle frequency domain resources for data transmission.

In direct communication between vehicles through a PC-5 interface in an LTE (Long term evolution) system, a transmission resource selection mode based on perception can improve the transmission performance of data. Currently, when a service data packet arrives and a UE (vehicle) determines that resource selection is required, the number of times of sending the data packet is determined (multiple retransmission is usually adopted to improve the sending performance of the data packet. In general, a certain time (e.g., several subframes (or time slots) may be spaced between the time for selecting resources and the initial transmission resource of the data packet), during which, in order to avoid collision between the initial transmission resource and the retransmission resource selected by the User Equipment (UE) and the initial transmission resource and the retransmission resource selected by another UE (vehicle), the performance of transmitting the data packet needs to be reduced, SA information (information of the initial transmission resource and/or the retransmission resource selected by the UE sent by the SA) sent by another UE (vehicle) needs to be monitored to determine whether the initial transmission resource and the retransmission resource selected by the User Equipment (UE) collide with the initial transmission resource and/or the retransmission resource of another UE, and when collision is found, the initial transmission resource and the retransmission resource need to be selected for the UE again. When the retransmission times of the data packet are large, the probability of detecting resource collision for multiple times before the initial transmission of the data packet of the UE is large, and a large amount of calculation is consumed for resource reselection every time, so that the electric quantity consumption of the UE is increased.

Disclosure of Invention

The invention aims to provide a resource selection method and a resource selection device, which solve the problem that the terminal electric quantity is seriously consumed due to the fact that a large amount of calculation is required to be consumed for resource reselection in the prior art.

In order to achieve the above object, an embodiment of the present invention provides a resource selection method, including:

selecting a first transmission resource and a resource for carrying control information of the first transmission resource for a first service data packet according to information of the first service data packet of a first terminal;

before the resource of the control information arrives, detecting whether the initial transmission resource of the first service data packet collides with the transmission resource of a second service data packet of a second terminal; wherein, the transmission resource of the second service data packet comprises the initial transmission resource and/or the retransmission resource of the second service data packet;

if the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet, before the resource of the control information arrives, the initial transmission resource and/or the resource used for carrying the control information of the initial transmission resource is selected for the first service data packet again, and whether the newly selected initial transmission resource collides with the transmission resource of the second service data packet of the second terminal or not is detected;

if the initial transmission resource of the first service data packet does not collide with the transmission resource of the second service data packet, determining the transmission resource of the first service data packet before the resource of the control information arrives; wherein, the transmission resource of the first service data packet includes an initial transmission resource and/or a retransmission resource of the first service data packet.

The step of selecting an initial transmission resource for a first service data packet according to information of the first service data packet of a first terminal includes:

and selecting initial transmission resources for a first service data packet according to the arrival time of the first service data packet of the first terminal, the transmission delay of the first service data packet and time slot state information maintained by the first terminal.

Before the resource of the control information arrives, the step of detecting whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal includes:

receiving control information of a second terminal sent by the second terminal before the resource of the control information arrives, wherein the control information carries position information of transmission resource of a second service data packet of the second terminal;

and judging whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal according to the position information of the transmission resource of the second service data packet.

Wherein the step of selecting an initial transmission resource for the first service data packet comprises:

selecting a first transmission time domain resource for the first service data packet;

the step of judging whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal according to the position information of the transmission resource of the second service data packet includes:

judging whether the selected initial transmission time domain resources have frequency domain resources required for transmitting the first service data packet or not according to the position information of the transmission resources of the second service data packet;

if the selected initial transmission time domain resources have unoccupied frequency domain resources required for transmitting the first service data packet, determining that the selected initial transmission time domain resources of the first service data packet do not collide with the transmission resources of the second service data packet; otherwise, determining that the selected initial transmission time domain resource of the first service data packet collides with the transmission resource of the second service data packet.

Wherein, if the initial transmission resource of the first service data packet does not collide with the transmission resource of the second service data packet, the step of determining the transmission resource of the first service data packet before the resource of the control information arrives includes:

if the initial transmission time domain resource of the first service data packet does not collide with the transmission resource of the second service data packet, before the resource of the control information arrives, the initial transmission frequency domain resource of the first service data packet and the retransmission time domain resource and the retransmission frequency domain resource of the first service data packet are determined.

selecting an initial transmission time domain resource and an initial transmission frequency domain resource for the first service data packet;

judging whether the positions of the selected initial transmission time domain resources and the initial transmission frequency domain resources are different from the positions of the transmission resources of the second service data packet according to the position information of the transmission resources of the second service data packet;

if the positions of the selected initial transmission time domain resource and the initial transmission frequency domain resource are different from the positions of the transmission resources of the second service data packet, determining that the initial transmission time domain resource and the initial transmission frequency domain resource of the first service data packet do not collide with the transmission resources of the second service data packet; otherwise, determining that the initial transmission time domain resource and the initial transmission frequency domain resource of the first service data packet collide with the transmission resource of the second service data packet.

and if the initial transmission time domain resource and the initial transmission frequency domain resource of the first service data packet do not collide with the transmission resource of the second service data packet, determining the retransmission time domain resource and the retransmission frequency domain resource of the first service data packet before the resource of the control information arrives.

An embodiment of the present invention further provides a resource selection apparatus, including:

the selection module is used for selecting initial transmission resources and resources used for carrying control information of the initial transmission resources for a first service data packet according to information of the first service data packet of a first terminal;

a detection module, configured to detect whether an initial transmission resource of the first service data packet collides with a transmission resource of a second service data packet of a second terminal before a resource of the control information arrives; wherein, the transmission resource of the second service data packet comprises the initial transmission resource and/or the retransmission resource of the second service data packet;

the first processing module is used for selecting the initial transmission resource and/or the resource carrying the control information of the initial transmission resource for the first service data packet again before the resource of the control information arrives and detecting whether the newly selected initial transmission resource collides with the transmission resource of the second service data packet of the second terminal or not if the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal;

the second processing module is used for determining the transmission resource of the first service data packet before the resource of the control information arrives if the initial transmission resource of the first service data packet does not collide with the transmission resource of the second service data packet; wherein, the transmission resource of the first service data packet includes an initial transmission resource and/or a retransmission resource of the first service data packet.

Wherein the selection module comprises:

and the first selection submodule is used for selecting initial transmission resources for the first service data packet according to the arrival time of the first service data packet of the first terminal, the sending delay of the first service data packet and the time slot state information maintained by the first terminal.

Wherein the detection module comprises:

the receiving submodule is used for receiving the control information of the second terminal sent by the second terminal before the resource of the control information arrives, and the control information carries the position information of the transmission resource of the second service data packet of the second terminal;

and the judging submodule is used for judging whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal according to the position information of the transmission resource of the second service data packet.

Wherein the selection module comprises:

a second selection submodule, configured to select an initial transmission time domain resource for the first service data packet;

the judgment sub-module includes:

a first judging unit, configured to judge whether a frequency domain resource required for transmitting the first service data packet exists in the selected initial transmission time domain resource according to the location information of the transmission resource of the second service data packet;

a second determining unit, configured to determine that the selected initial transmission time domain resource of the first service data packet does not collide with a transmission resource of a second service data packet if an unoccupied frequency domain resource required for transmitting the first service data packet exists in the selected initial transmission time domain resource; otherwise, determining that the selected initial transmission time domain resource of the first service data packet collides with the transmission resource of the second service data packet.

Wherein the second processing module comprises:

and the first processing submodule is used for determining the initial transmission frequency domain resource of the first service data packet and the retransmission time domain resource and the retransmission frequency domain resource of the first service data packet before the resource of the control information arrives if the initial transmission time domain resource of the first service data packet does not collide with the transmission resource of the second service data packet.

Wherein the selection module comprises:

and the third selection submodule is used for selecting the initial transmission time domain resource and the initial transmission frequency domain resource for the first service data packet.

The judgment sub-module includes:

a third determining unit, configured to determine, according to the location information of the transmission resource of the second service data packet, whether the selected initial transmission time domain resource and initial transmission frequency domain resource are all different from the location of the transmission resource of the second service data packet;

a fourth determining unit, configured to determine that the initial transmission time domain resource and the initial transmission frequency domain resource of the first service data packet do not collide with the transmission resource of the second service data packet if the positions of the selected initial transmission time domain resource and the initial transmission frequency domain resource are all different from the positions of the transmission resource of the second service data packet; otherwise, determining that the initial transmission time domain resource and the initial transmission frequency domain resource of the first service data packet collide with the transmission resource of the second service data packet.

Wherein the second processing module comprises:

and the second processing submodule is used for determining the retransmission time domain resource and the retransmission frequency domain resource of the first service data packet before the resource of the control information arrives if the initial transmission time domain resource and the initial transmission frequency domain resource of the first service data packet do not collide with the transmission resource of the second service data packet.

The technical scheme of the invention at least has the following beneficial effects:

in the resource selection method and device of the embodiment of the invention, when a first terminal judges that resource selection is needed, initial transmission resources are selected first, whether the selected initial transmission resources collide is judged according to received control information SA of other terminals (second terminals) before the resources carrying control information of the initial transmission resources arrive, and the initial transmission resources are reselected if the initial transmission resources collide; if no collision is detected in the initial transmission resource, determining the retransmission resource before the initial transmission resource arrives; therefore, the probability of resource reselection caused by resource collision is reduced, and the electric quantity consumption caused by resource reselection is further reduced.

Drawings

Fig. 1 is a schematic diagram illustrating a prior art method for a terminal to autonomously select resources;

fig. 2 is a schematic diagram illustrating resource selection performed by a base station assisting terminal in the prior art;

fig. 3 is a diagram illustrating an example of a method for selecting resources by a terminal in the prior art;

FIG. 4 is a flowchart illustrating the basic steps of a resource selection method according to a first embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a first example of a resource selection method according to a first embodiment of the present invention;

fig. 6 is a schematic diagram illustrating selection of initial transmission time domain resources according to a first example and a second example in a resource selection method according to a first embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a second example of the resource selection method according to the first embodiment of the present invention;

fig. 8 is a schematic diagram illustrating a third example of the resource selection method according to the first embodiment of the present invention;

fig. 9 is a schematic diagram illustrating selection of initial transmission time domain resources according to a third example in the resource selection method according to the first embodiment of the present invention;

fig. 10 is a schematic structural diagram of a resource selection apparatus according to a second embodiment of the present invention;

fig. 11 is a schematic structural diagram of a resource selection apparatus according to a third embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

First embodiment

As shown in fig. 4, a first embodiment of the present invention provides a resource selection method, including:

step 401, selecting an initial transmission resource and a resource for carrying control information of the initial transmission resource for a first service data packet according to information of the first service data packet of a first terminal;

step 402, before the resource of the control information arrives, detecting whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal; wherein, the transmission resource of the second service data packet comprises the initial transmission resource and/or the retransmission resource of the second service data packet;

step 403, if the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet, before the resource of the control information arrives, reselecting the initial transmission resource and/or the resource for carrying the control information of the initial transmission resource for the first service data packet and detecting whether the reselected initial transmission resource collides with the transmission resource of the second service data packet of the second terminal;

step 404, if the initial transmission resource of the first service data packet does not collide with the transmission resource of the second service data packet, before the resource of the control information arrives, determining the transmission resource of the first service data packet; wherein, the transmission resource of the first service data packet includes an initial transmission resource and/or a retransmission resource of the first service data packet.

In the embodiment of the invention, when the first terminal judges that the resource selection needs to be carried out on the first service data packet, the initial transmission resource of the first service data packet is selected according to the maintained time slot state information; and before the resource (SA resource) carrying the control information of the initial transmission resource information of the first service data packet arrives, judging whether the initial transmission resource is collided according to the received SA information of other terminals. If the initial transmission resource is not collided, selecting a retransmission resource before the SA carrying the initial transmission resource information is sent, wherein the sent SA carries the initial transmission resource and/or the retransmission resource determined by the first terminal; if the initial transmission resource is collided, selecting the initial transmission resource for the service data packet according to the maintained time slot state information again until the initial transmission resource collision is not detected before the SA resource carrying the initial transmission resource information arrives or other set conditions are met, and stopping judging whether the initial transmission resource of the service data packet is collided or not; therefore, the probability of resource reselection caused by resource collision is reduced, and the electric quantity consumption caused by resource reselection is further reduced.

Specifically, in the foregoing embodiment of the present invention, step 401 includes:

according to the arrival time of a first service data packet of a first terminal, the sending delay of the first service data packet and time slot state information maintained by the first terminal, selecting initial transmission resources and resources used for carrying control information of the initial transmission resource information for the first service data packet.

In the above embodiment of the present invention, when selecting the initial transmission resource for the first service data packet, the following conditions are generally required to be satisfied: selecting a time slot which is not occupied by other terminals according to the time slot state information maintained by the first terminal; and a time slot between the arrival time of the first service data packet and the arrival time of the first service data packet + the transmission delay. For example, if the arrival time of the first service data packet is subframe 5, the length of each subframe is 1ms, and the transmission delay of the first service data packet is 100ms, a time domain position of an initial transmission resource (or referred to as an initial transmission time domain resource) and a time domain position of a resource carrying control information of the initial transmission resource information are selected for the first service data packet between subframe 5 and subframe 105.

Further, in the foregoing embodiment of the present invention, step 402 includes:

step 4021, receiving control information of the second terminal sent by the second terminal before the resource of the control information arrives, wherein the control information carries the position information of the transmission resource of the second service data packet of the second terminal;

step 4022, according to the location information of the transmission resource of the second service data packet, determining whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal.

In the embodiment of the present invention, the first terminal can determine whether the initial transmission resource selected by the first terminal collides with the transmission resource of the service data packet of the other terminal (i.e., the second service data packet of the second terminal) according to the control information SA sent by the other terminal.

Specifically, whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal is judged to be divided into two cases:

in the first case, when the first terminal selects the initial transmission resource for the first service data packet, only the time domain position corresponding to the initial transmission resource is determined, that is, the initial transmission time domain resource; in the second case, when the first terminal selects the initial transmission resource for the first service data packet, the time domain position corresponding to the initial transmission resource and the frequency domain position corresponding to the initial transmission resource are determined, that is, the initial transmission time domain resource and the initial transmission frequency domain resource.

How to determine whether the initial transmission resource is collided under the two conditions is described in detail below:

in the first case:

only the initial transmission time domain resource is selected when the initial transmission resource is selected for the first service data packet, and correspondingly, step 4022 includes:

That is, when the selected initial transmission resource is only the time domain position corresponding to the initial transmission resource, the collision determination mode is as follows: before the time domain position (such as a subframe position and a time slot position) of the SA carrying the initial transmission resource arrives, judging whether the frequency domain resource required for transmitting the first service data packet still exists in the time domain position selected for the initial transmission resource according to the received SA transmitted by other terminals; and if the frequency domain resources required for sending the first service data packet still exist in the time domain position, the initial transmission resources are considered not to be collided, otherwise, the initial transmission resources are considered to be collided.

Accordingly, in the first case, step 404 includes:

That is, in the first case, before the SA carrying the initial transmission resource is sent (i.e., before the resource of the control information arrives), the frequency domain position corresponding to the initial transmission resource is determined in addition to the time domain and the frequency domain position corresponding to the retransmission resource.

In the second case:

selecting an initial transmission time domain resource and an initial transmission frequency domain resource for the first service data packet, where the corresponding step 4022 includes:

That is, when the selected initial transmission resource includes both the time domain position and the frequency domain position, the collision determination mode is: before the time domain position (such as subframe position and time slot position) of the SA carrying the initial transmission resource arrives, judging that the time frequency position of the selected initial transmission resource is the same as the partial or all of the initial transmission or retransmission resource selected by other UE according to the received SA sent by other terminals, and considering that the initial transmission resource collides. Otherwise, determining that the initial transmission resource is not collided.

Accordingly, in the second case, step 404 includes:

That is, in the second case, before the SA carrying the initial transmission resource is sent (i.e., before the resource of the control information arrives), only the time domain and the frequency domain position corresponding to the retransmission resource need to be determined again.

It should be noted that, for reasons such as processing time of actual hardware, in step 404 in this application, "determine transmission resources of the first service data packet before resources of the control information arrive" does not limit that retransmission resources can only be selected in a time unit (e.g., subframe, timeslot) before SA transmission associated with an initially transmitted data packet is sent, and a specific time for selecting retransmission resources may be determined according to actual situations, for example: if SA information assembly needs to occupy 3 time units, retransmission resources may be selected in the 4 th subframe before SA transmission, which is not specifically limited herein.

In summary, in the above embodiments of the present invention, when the first terminal determines that resource selection is required, the first terminal first selects the first transmission resource, and determines whether the selected first transmission resource collides before the first transmission resource arrives according to the received control information SA of another terminal (the second terminal), and if the first transmission resource collides, the first transmission resource is reselected; if no collision is detected in the initial transmission resource, determining the retransmission resource before the initial transmission resource arrives; therefore, the probability of resource reselection caused by resource collision is reduced, and the electric quantity consumption caused by resource reselection is further reduced.

In order to describe the resource selection method provided by the embodiment of the present invention more clearly, the following describes the resource selection method provided by the embodiment of the present invention in detail with reference to specific embodiments:

first example

The SA associated with the first service data packet of the first terminal and the transmission of the data packet content are located in the same subframe (that is, the SA carrying the initial transmission resource and the initial transmission resource are located in the same subframe). The maximum portable number of the indication data transmission resource information in the SA is 3. The time-frequency resource location information of the transmission version of each service data packet in the SA indicating the current subframe occupied by the transmission version of the data packet and the time-frequency location occupied by the data packet during retransmission are shown in fig. 5. The system bandwidth is 10MHz (corresponding to 50 PRBs), the SA resource pool is located at two sides of the frequency band (occupying 2MHz in total, corresponding to 10 PRBs, namely, the upper and lower 5 PRBs), each SA transmission occupies one PRB, the data resource pool occupies the middle 8MHz, and the size and position information of the PRB resource needed to be used in the data transmission are indicated by the SA or agreed by the protocol.

When a new service data packet arrives, the terminal judges that there is no resource to transmit the newly arrived data packet. The arrival time of the data packet is set as a subframe 5, the length of each subframe is 1ms, and the number of times of initial transmission and retransmission required by the data packet is 3 (namely, 1 time of initial transmission and 2 times of retransmission). The transmission delay of the data packet is required to be 100 ms.

Initial transmission (time domain) resources are selected for the service data packet between the subframe 5 and the subframe 105, and the selected initial transmission time domain resource is set as a subframe 37, as shown in fig. 6.

Before the sub-frame 37 arrives, whether the initial transmission resource selected for the data packet is collided or not is judged according to the received SA information sent by other terminals. The judgment criterion of the collision is as follows: before the time domain position (such as a subframe position and a time slot position) of the SA carrying the initial transmission resource arrives, the initial transmission resource is considered not to be collided when the SA sent by other UE is received to judge that the time domain position selected by the initial transmission resource still has the required frequency domain resource capable of sending the data packet, otherwise, the initial transmission resource is considered to be collided. Before the sub-frame 37 arrives, it is determined that the initial transmission resource collision is not determined according to the received SA information sent by other terminals.

If the group packing time of the SA information is 0, the frequency domain position corresponding to the initial transmission resource and the time domain and frequency domain position corresponding to the retransmission resource are determined at the position where the subframe 36 ends (i.e., the subframe 37 starts). The 8MHz for sending the service data packet is divided into 4 sub (frequency) bands, it is determined that sub-bands 2 and 3 on the sub-frame 37 can be selected according to the received SA sent by other UEs, and the sub-band 3 is randomly selected as a frequency domain resource corresponding to the initial transmission resource. Setting time domain positions and frequency domain positions selected for two retransmission resources between the sub-frames 37-105 and on the sub-bands 1-4 according to the received SA information sent by other UEs, wherein the selected time domain positions are as follows: subframe 85 and subframe 96, wherein the selected frequency domain positions are respectively as follows: subband 1 and subband 3.

Therefore, the SA corresponding to the data packet sent in the subframe 37 carries the location information of the initial transmission and retransmission resources sent for the data packet, and the SA randomly selects and sends the data packet on the PRB5 in the SA resource pool. The SA corresponding to the data packet sent in the subframe 85 carries the location information of the retransmission resources for two times sent for the data packet, and the SA randomly selects and sends the data packet on the PRB3 in the SA resource pool. The SA corresponding to the data packet sent in the subframe 96 carries the location information of the last retransmission resource sent for the data packet, and the SA randomly selects and sends the data packet on the PRB8 in the SA resource pool.

Second example

The SA associated with the first service packet of the first terminal and the transmission of the packet content are located in different sub-frames. The maximum portable number of indication data transmission resource information in the SA is 2. The SA associated with each service data packet is sent before the service data packet, and the time-frequency resource location information corresponding to the initial transmission and retransmission of the data packet is indicated in the SA as shown in fig. 7.

When a new service data packet arrives, the UE determines that there is no resource to send the newly arrived data packet. The arrival time of the data packet is set as a subframe 5, the length of each subframe is 1ms, and the number of times of initial transmission and retransmission required by the data packet is 2 (namely, 1 time of initial transmission and 1 time of retransmission). The transmission delay of the data packet is required to be 100 ms.

Let the system bandwidth be 10MHz, 2MHz for transmitting SA, and 8MHz for transmitting service data packet (as shown in fig. 5). Let 2MHz for transmitting SA be divided into 10 SA sub (frequency) bands, and 8MHz for transmitting traffic packets be divided into 4 data sub (frequency) bands. According to the SA sent by the other received UEs, an initial transmission time domain resource is selected for the service data packet between the subframe 5 and the subframe 105, and the subframe corresponding to the selected initial transmission time domain resource is set as the subframe 37, as shown in fig. 6. And selecting initial transmission frequency domain resources for the service data packets among the data sub-bands 1-4, and setting the selected initial transmission frequency domain resources as a sub-band 2. And selecting sending resources for the initial transmission and the retransmission of the SA between the subframe 5 and the subframe 37, setting the time domain resources of the initial transmission and the retransmission of the SA selection as the subframe 23 and the subframe 30 respectively, selecting the frequency domain resources of the initial transmission and the retransmission of the SA in the sub-bands of the SA resource pool 1-10, and setting the frequency domain resources of the initial transmission and the retransmission of the SA selection as the sub-bands 5 and 7 respectively.

Before the sub-frame 23 arrives, whether the initial transmission resource selected for the data packet is collided or not is judged according to the received SA information sent by other terminals. The judgment criterion of the collision is as follows: and judging that the time-frequency position of the initial transmission resource of the service data packet selected by the UE is the same as part or all of the initial transmission or retransmission resource selected by other UE according to the received SA before the time-domain position (such as the subframe position and the time slot position) of the initial transmission SA resource arrives, and considering that the initial transmission resource is collided. And if the subframe 15 receives the SA information sent by the terminal B and indicates that retransmission resources occupied by sending the service data packet of the terminal B are the same as initial transmission resources of the terminal A, judging the initial transmission resource collision of the terminal A. At this time, it needs to be determined again, and the terminal a sends the initial transmission resource used by the service data packet. According to the position of the initial transmission resource used for sending the service data packet, which is reselected, the time-frequency resource selected by the terminal a for sending the SA may be determined again or not.

According to the received SA sent by other terminals, the initial transmission time domain resource is reselected for the service data packet between the sub-frame 15 and the sub-frame 105, the sub-frame corresponding to the selected initial transmission time domain resource is set as a sub-frame 45, the initial transmission frequency domain resource is reselected for the service data packet between the data sub-bands 1-4, and the selected initial transmission frequency domain resource is set as a sub-band 3. And selecting sending resources for the initial transmission and the retransmission of the SA between the subframe 15 and the subframe 45, setting the time domain resources of the initial transmission and the retransmission of the SA to be respectively the subframe 26 and the subframe 35, selecting the frequency domain resources of the initial transmission and the retransmission of the SA between the SA sub-bands 1-10, and setting the frequency domain resources of the initial transmission and the retransmission of the SA to be respectively the subframe 3 and the subframe 9. Before the subframe 25 arrives, it is determined that the initial transmission resource collision of the service data packet is not determined according to the received SA information sent by other UEs.

If the packet packing time of the SA information is 1, the time domain and the frequency domain corresponding to the retransmission resource of the service data packet are retransmitted at the position where the subframe 24 ends (i.e., the subframe 25 starts). Setting the time domain position of retransmission resources selected according to the received SA sent by other UE as follows: in subframe 81, the frequency domain positions selected are: subband 2.

Then, the SA corresponding to the data packet sent in the subframe 26 carries the location information of the initial transmission and retransmission resources sent for the data packet. The SA corresponding to the data packet sent in the subframe 35 carries the retransmission resource location information sent for the data packet.

Third example

The SA associated with the first service packet and the transmission of the packet contents are located in different sub-frames. The maximum portable number of indication data transmission resource information in the SA is 2. The SA associated with each service data packet is sent before the service data packet, and the time-frequency resource location information corresponding to the initial transmission and retransmission of the data packet is indicated in the SA as shown in fig. 8. The system bandwidth is 10MHz (corresponding to 50 PRBs), the SA resource pool is located at two sides of the frequency band (occupying 2MHz in total, corresponding to 10 PRBs, namely, the upper and lower 5 PRBs), each SA transmission occupies one PRB, the data resource pool occupies the middle 8MHz, and the size and position information of the PRB resource needed to be used in the data transmission are indicated by the SA or agreed by the protocol.

According to the SA sent by the other received UEs, an initial transmission time domain resource is selected for the service data packet between the subframe 5 and the subframe 105, and the subframe corresponding to the selected initial transmission time domain resource is set as a subframe 87, as shown in fig. 9. The selected initial transmission frequency domain resource is designed as PRB6-PRB15 in a data resource pool (comprising 40 PRBs). In order to reduce the probability of collision between the selected initial transmission resource and the indicated resource in the SA of other UEs, in this embodiment, the time domain range of SA resource selection is set as follows: the initial retransmission resource of the SA is selected from the time of the arrival of the data packet to min (the time domain position of the initial transmission resource, the time of the arrival of the data packet +1/2 × (transmission delay requirement)), that is, from subframe 5 to subframe min (87,5+50) ═ 55, the time domain resources of the initial transmission and the retransmission selected by the SA are respectively subframe 23 and subframe 30, the frequency domain resources of the initial transmission and the retransmission selected by the SA are selected for the SA in the SA resource pools 1 to 10PRB, and the frequency domain resources of the initial transmission and the retransmission selected by the SA are respectively PRB5 and PRB 7.

Before the sub-frame 23 arrives, whether the initial transmission resource selected for the data packet is collided or not is judged according to the received SA information sent by other terminals. The judgment criterion of the collision is as follows: and judging that the time-frequency position of the initial transmission resource of the service data packet selected by the terminal is the same as part or all of the initial transmission or retransmission resource selected by other terminals according to the received SA before the time-domain position (such as the subframe position and the time slot position) of the initial transmission SA resource arrives, and considering that the initial transmission resource is collided. And if the subframe 15 receives the SA information sent by the terminal B and indicates that retransmission resources occupied by sending the service data packet of the terminal B are the same as initial transmission resources of the terminal A, judging the initial transmission resource collision of the terminal A. At this time, it needs to be determined again, and the terminal a sends the initial transmission resource used by the service data packet. According to the position of the initial transmission resource used by the reselected sending service data packet, the time-frequency resource selected by the terminal a for sending the SA may be determined again or not.

According to the received SA sent by other terminals, the initial transmission time domain resource is selected again for the service data packet between the subframe 15 and the subframe 105, the subframe corresponding to the selected initial transmission time domain resource is set as the subframe 45, and the selected initial transmission frequency domain resource is the PRB3-PRB12 in the data resource pool. Since the originally selected SA resources can still be used, the SA resources are not reselected. Before the sub-frame 23 arrives, it is determined that the initial transmission resource collision of the service data packet is not determined according to the received SA information sent by other terminals.

If the packet packing time of the SA information is 1, the time domain and the frequency domain corresponding to the retransmission of the service data packet are determined at the position where the subframe 21 ends (i.e., the subframe 22 starts). Setting the time domain position of retransmission resources selected according to the received SA sent by other terminals as follows: in subframe 81, the frequency domain positions selected are: PRB21-PRB30 in the data resource pool.

Then, the SA corresponding to the data packet sent in the subframe 23 carries the location information of the initial transmission and retransmission resources sent for the data packet. The SA corresponding to the data packet sent in the subframe 30 carries the retransmission resource location information sent for the data packet.

Second embodiment

In order to better achieve the above object, as shown in fig. 10, a second embodiment of the present invention further provides a resource selection apparatus, including:

a selecting module 101, configured to select, according to information of a first service data packet of a first terminal, an initial transmission resource and a resource used for carrying control information of the initial transmission resource for the first service data packet;

a detecting module 102, configured to detect whether an initial transmission resource of the first service data packet collides with a transmission resource of a second service data packet of a second terminal before a resource of the control information arrives; wherein, the transmission resource of the second service data packet comprises the initial transmission resource and/or the retransmission resource of the second service data packet;

the first processing module 103 is configured to, if an initial transmission resource of a first service data packet collides with a transmission resource of a second service data packet, reselect an initial transmission resource and/or a resource used for carrying control information of the initial transmission resource for the first service data packet before a resource of the control information arrives, and detect whether the reselected initial transmission resource collides with a transmission resource of a second service data packet of a second terminal;

a second processing module 104, configured to determine, if an initial transmission resource of a first service data packet does not collide with a transmission resource of a second service data packet, the transmission resource of the first service data packet before a resource of the control information arrives; wherein, the transmission resource of the first service data packet includes an initial transmission resource and/or a retransmission resource of the first service data packet.

Specifically, in the second embodiment of the present invention, the selecting module includes:

the first selection submodule is used for selecting a first transmission resource and a resource for carrying control information of the first transmission resource for the first service data packet according to the arrival time of the first service data packet of the first terminal, the sending delay of the first service data packet and the time slot state information maintained by the first terminal.

Specifically, in the second embodiment of the present invention, the detection module includes:

the judgment sub-module includes:

Specifically, in the second embodiment of the present invention, the second processing module includes:

The judgment sub-module includes:

The resource selection apparatus provided in the second embodiment of the present invention selects an initial transmission resource first when the first terminal determines that resource selection is required, determines whether the selected initial transmission resource collides or not according to the received control information SA of another terminal (the second terminal) before the resource carrying the control information of the initial transmission resource arrives, and reselects the initial transmission resource if the initial transmission resource collides; if no collision is detected in the initial transmission resource, determining the retransmission resource before the initial transmission resource arrives; therefore, the probability of resource reselection caused by resource collision is reduced, and the electric quantity consumption caused by resource reselection is further reduced.

It should be noted that, the resource selection apparatus provided in the second embodiment of the present invention is a resource selection apparatus applying the resource selection method provided in the first embodiment, and all embodiments of the resource selection method are applicable to the resource selection apparatus, and can achieve the same or similar beneficial effects.

Third embodiment

In order to better achieve the above object, as shown in fig. 11, a third embodiment of the present invention further provides a resource selection apparatus, including: a processor 100; a memory 120 connected to the processor 100 through a bus interface, and a transceiver 110 connected to the processor 100 through a bus interface; the memory is used for storing programs and data used by the processor in executing operations; transmitting data information or pilot frequency through the transceiver 110, and receiving a downlink control channel through the transceiver 110; when the processor calls and executes the programs and data stored in the memory, the following functional modules are implemented:

In fig. 11, among other things, the bus architecture may include any number of interconnected buses and bridges, with various circuits of one or more processors, represented by processor 100, and memory, represented by memory 120, 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 110 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 100 is responsible for managing the bus architecture and general processing, and the memory 120 may store data used by the processor 100 in performing operations.

The processor 100 is responsible for managing the bus architecture and general processing, and the memory 120 may store data used by the processor 100 in performing operations.

It should be noted that, the third embodiment of the present invention provides a resource selection device corresponding to the resource selection device provided in the second embodiment, so that all the embodiments of the resource selection method provided in the first embodiment are applicable to the channel transmission device, and can achieve the same or similar beneficial effects.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for resource selection, comprising:

selecting a first transmission resource and a resource for carrying control information of the first transmission resource for a first service data packet according to information of the first service data packet of a first terminal; the initial transmission resource of the first service data packet and the resource used for carrying the control information of the initial transmission resource are positioned in the same subframe;

2. The resource selection method according to claim 1, wherein the step of selecting the initial transmission resource for the first service data packet according to the information of the first service data packet of the first terminal comprises:

according to the arrival time of a first service data packet of a first terminal, the sending delay of the first service data packet and time slot state information maintained by the first terminal, selecting initial transmission resources and resources used for carrying control information of the initial transmission resources for the first service data packet.

3. The method of claim 1, wherein the step of detecting whether the initial transmission resource of the first service data packet collides with the transmission resource of the second service data packet of the second terminal before the resource of the control information arrives comprises:

4. The method of claim 3, wherein the step of selecting the initial transmission resource for the first service data packet comprises:

5. The resource selection method of claim 4, wherein the step of determining the transmission resource of the first service data packet before the resource of the control information arrives if the initial transmission resource of the first service data packet does not collide with the transmission resource of the second service data packet comprises:

6. The method of claim 3, wherein the step of selecting the initial transmission resource for the first service data packet comprises:

7. The resource selection method of claim 6, wherein the step of determining the transmission resource of the first service data packet before the resource of the control information arrives if the initial transmission resource of the first service data packet does not collide with the transmission resource of the second service data packet comprises:

8. A resource selection apparatus, comprising:

the selection module is used for selecting initial transmission resources and resources used for carrying control information of the initial transmission resources for a first service data packet according to information of the first service data packet of a first terminal; the initial transmission resource of the first data service packet and the resource used for carrying the control information of the initial transmission resource are positioned in the same subframe;

9. The resource selection apparatus of claim 8, wherein the selection module comprises:

10. The resource selection apparatus of claim 8, wherein the detection module comprises:

11. The resource selection apparatus of claim 10, wherein the selection module comprises:

the judgment sub-module includes:

12. The resource selection apparatus of claim 11, wherein the second processing module comprises:

13. The resource selection apparatus of claim 10, wherein the selection module comprises:

a third selecting submodule, configured to select an initial transmission time domain resource and an initial transmission frequency domain resource for the first service data packet;

the judgment sub-module includes:

14. The resource selection apparatus of claim 13, wherein the second processing module comprises: