CN110891289B - Channel access interception method and terminal equipment - Google Patents
Channel access interception method and terminal equipment Download PDFInfo
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- CN110891289B CN110891289B CN201911090333.7A CN201911090333A CN110891289B CN 110891289 B CN110891289 B CN 110891289B CN 201911090333 A CN201911090333 A CN 201911090333A CN 110891289 B CN110891289 B CN 110891289B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/26—Resource reservation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a channel access interception method and terminal equipment, which solve the problem that the existing method and equipment cannot reselect reserved resources. The method comprises the following steps: sending side link control information, wherein the side link control information is used for indicating reserved resources of next transmission or multiple transmissions; the reserved resources comprise three types; before the next reserved resource sending time after the side link control information is sent, when a certain reserved resource is sensed to meet a resource reselection condition, determining a resource reselection time window: if the reserved resource needing resource reselection is the type 1 or the type 3, the resource reselection time window is [ T1, T2]; if the reserved resource requiring resource reselection is of the type 2, the resource reselection time window is [ tx, T2], tx = max (th, T1). The terminal equipment uses the method. The invention can be used for channel interception and access of communication between 5G communication terminals.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a channel access interception method and a terminal device.
Background
In 5G car networking communication, when one sending terminal (originating UE) needs to send data to one or more receiving terminals (receiving UEs), a corresponding transmission resource may be selected in a channel sensing manner for carrying corresponding Sidelink Control Information (SCI) and an associated Sidelink data channel (pscch). The SCI transmitted therein may reserve transmission resources one or more times for one Transport Block (TB) or reserve transmission resources for other TBs. Currently, according to standard discussion, when an originating UE detects that a reserved resource is occupied by a higher-priority service of another UE and corresponding interference is higher than a certain threshold, a corresponding resource reselection is required, but the existing method does not provide a method for dealing with a resource reselection time window, and the number of times of triggering resource reselection may bring a large device overhead.
Disclosure of Invention
The invention provides a channel access interception method and terminal equipment, which solve the problem that the existing method and equipment cannot solve the problem of high resource reselection and resource reselection overhead.
In order to solve the above problems, the present invention is specifically realized as follows:
in a first aspect, a channel access sensing method, which enables resource reselection for reserved resources, includes the following steps: sending side link control information, wherein the side link control information is used for indicating reserved resources of next or multiple transmissions; the reserved resources include three types: type 1, the reserved resource is a retransmission resource of a transport block, and no transmission feedback of the transport block occurs before the transmission time of the reserved resource; type 2, the reserved resource is a retransmission resource of a transmission block, and the sending time of the reserved resource is after the transmission feedback of the transmission block; type 3, the reserved resource is a first transmission resource of a transmission block; determining a resource reselection time window when it is sensed that a certain reserved resource meets a resource reselection condition before the next reserved resource transmission time after the side link control information is transmitted: if the reserved resource needing resource reselection is of the type 1 or the type 3, the resource reselection time window is [ T1, T2]; if the reserved resource needing resource reselection is the type 2, the resource reselection time window is [ tx, T2], tx = max (th, T1); wherein th is a time when feedback of a transport block HARQ (Hybrid Automatic Repeat reQuest) corresponding to the reserved resource is finished and after transceiving conversion is performed before the reserved resource is transmitted, T1 is a preset first time parameter, and T2 is a preset second time parameter.
Further, the method further comprises: and determining the resource reselection triggering time when the condition of resource reselection is met before the next reserved resource sending time after the side link control information is sent.
Further, the T1 satisfies at least one of the following conditions: under the condition 1, T1-tp is not lower than the processing time delay for resource reselection and data ready to be sent, wherein tp is the triggering moment of resource reselection; and in the condition 2, T1 is more than or equal to Tn, and if the last reserved resource exists before the reserved resource, tn is the ending time of the last reserved resource.
Further, the T2 satisfies at least one of the following conditions: the condition 1 is that the T2 does not exceed the transmission delay requirement of the residual data packet of the transmission block; condition 2, where T2 is an upper limit of a resource selection window, and the resource selection window is a time window corresponding to a resource selection time when the resource selection condition is satisfied; and 3, if the next reserved resource exists after the reserved resource, T2 is the end time of the next reserved resource, and T2 is not less than T2 or T2 is not less than T2-Tgap, wherein the Tgap is the required time interval between two adjacent transmissions.
Preferably, for the reserved resource being of type 1, type 2 or type 3, the resource reselection triggering time is a time when the resource reselection condition is sensed to be satisfied.
Preferably, for the reserved resource being of type 1 or type 2, the resource reselection triggering time for triggering resource reselection for a certain reserved resource is a time when the monitored reserved resource satisfies the resource reselection condition when the transmission number of the transmission block corresponding to the reserved resource is less than M (M is an integer greater than or equal to 1).
Preferably, for the reserved resource being of type 1, type 2 or type 3, the determination manner of the resource reselection trigger time is as follows: if ts + W is larger than T1-T3, monitoring that the resource reselection condition is met for one time or more times in a [ ts, T1-T3] time window, and setting the triggering time of the resource reselection as T1-T3; if ts + W is less than or equal to T1-T3, monitoring that the resource reselection condition is met for one time or more times in a [ ts, ts + W ] time window, and setting the resource reselection triggering time to be ts + W; repeating the steps until data is sent; w is a reselection trigger time interval, ts is a current channel monitoring start time, T1 is a transmission time of a next reserved resource at the current time, and T3 is a third time parameter.
Preferably, when the reserved resource is of type 1, type 2 or type 3, and the resource reselection triggering time is T1-T3 when it is detected in [ ts, T1-T3] that the resource reselection condition is met for one or more times, where ts is a channel sensing starting time, T1 is a transmission time of the next reserved resource at the current time, and T3 is a third time parameter.
Preferably, for the reserved resource being type 2, the resource reselection is started in a manner that if T1-T3 is greater than or equal to th, the received HARQ feedback is NACK, and it is detected that the reserved resource meets the resource reselection condition, and the resource reselection is started; if T1-T3< th, monitoring that the reserved resources meet the resource reselection condition before T1-T3, and starting resource reselection; wherein, T1 is the transmission time of the next reserved resource at the current time, th is the time before the transmission of the reserved resource and after the HARQ feedback of the transport block corresponding to the reserved resource is finished, and T3 is a third time parameter.
In a second aspect, the present invention provides a channel access interception terminal device, which uses the method described above, including: the device comprises a monitoring module, a determining module and a sending module; the sending module is used for sending side link control information; the monitoring module is used for monitoring the channel state before the sending time of the reserved resource; and the determining module is used for determining the resource reselection triggering time and the resource reselection time window based on the channel interception result.
The beneficial effects of the invention include: the invention provides an interception method of channel access, which determines a time window for triggering the resource reselection of reserved resources by sending end UE according to a channel interception result and the triggering time of the resource reselection, solves the problem of the resource reselection in a busy channel state, effectively reduces the equipment overhead caused by triggering the resource reselection by the resource preemption, reduces the collision between resource selection and improves the transmission efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 (a) is a method flow of an embodiment of a channel access listening method;
fig. 1 (b) is a first case of a resource reselection time window determination manner in an embodiment of a channel access sensing method;
fig. 1 (c) illustrates a second case of a resource reselection time window determination method of a channel access interception method;
fig. 1 (d) is an embodiment of determining an upper limit of a resource reselection time window of a channel access sensing method;
fig. 2 (a) is a flowchart of an embodiment of a channel access sensing method including a resource reselection trigger time;
fig. 2 (b) is a resource reselection trigger time determining manner of an embodiment of a channel access sensing method including a resource reselection trigger time;
fig. 3 is an embodiment of a channel access sensing terminal device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The innovation points of the invention are as follows: firstly, the invention innovatively provides a channel access interception method, so that a sending end UE can trigger a time window when the resource reselection is triggered and the triggering time of the resource reselection according to a channel interception result after the SCI is sent, and a resource reselection rule is defined; secondly, the invention provides a method for triggering the resource reselection without meeting the resource reselection condition every time, thereby effectively reducing the equipment overhead introduced by the resource reselection triggered by the resource preemption, reducing the collision among the resource selections and improving the transmission efficiency.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1:
fig. 1 (a) is a method flow of an embodiment of a channel access sensing method, fig. 1 (b) is a first case of a resource reselection time window determination manner of the embodiment of the channel access sensing method, fig. 1 (c) is a second case of the resource reselection time window determination manner of the embodiment of the channel access sensing method, and fig. 1 (d) is an embodiment of a resource reselection time window upper limit determination manner of the embodiment of the channel access sensing method.
An embodiment of a channel access interception method flow realizes resource reselection by adopting a channel interception mode, and specifically comprises the following steps:
In step 101, the sidelink control information is used to indicate reserved resources for next or multiple transmissions; the reserved resources include three types: type 1, the reserved resource is a retransmission resource of a transport block, and no transmission feedback of the transport block occurs before the transmission time of the reserved resource; type 2, the reserved resource is a retransmission resource of a transmission block, and the sending time of the reserved resource is after the transmission feedback of the transmission block; and type 3, the reserved resource is a first transmission resource of one transmission block.
In step 101, the originating UE has sent out the Sidelink Control Information (SCI) indicating the reserved resource for the next or multiple transmissions, and assuming that the originating UE switches from the sending state to the receiving state after sending the sidelink control information at time t0, the transmission time of the next reserved resource is t1, the originating UE continues channel sensing before t1, and the originating UE may determine to perform resource reselection on the reserved transmission resource after time t1 according to the channel sensing result.
In step 101, the retransmission resource indicates that the resource is used for the nth (N is an integer greater than 1) transmission of one TB, and the first transmission resource of one transport block indicates that the resource is used for the first transmission of one TB.
In step 101, the transmission feedback indicates that the receiving UE performs HARQ detection on one receiving TB, and feeds back a detection result to the originating UE. In general, when the detection result of one TB is ACK, it indicates that the receiving UE correctly receives the TB, and when the detection result is NACK, it indicates that the receiving UE does not correctly receive the TB.
And 102, determining a resource reselection time window when the condition of resource reselection is met before the next reserved resource sending time after the time t 0.
In step 102, the next reserved resource after the time t0 may be expressed as a first reserved resource.
In step 102, the resource reselection time window is a reselection time window for performing resource reselection on a certain reserved resource R at the time t0 and later, that is, performing reselection on the reserved resource R in the resource reselection time window.
In step 102, if the reserved resource R is of the type 1 or the type 3, the resource reselection time window is [ T1, T2], as shown in fig. 1 (b); if the reserved resource R is of the type 2, the resource reselection time window is [ tx, T2], tx = max (th, T1), as shown in fig. 1 (c); and tp is the triggering time of resource reselection, th is the time after the transmission of the reserved resource R and the transmission and reception conversion of the HARQ feedback for the TB corresponding to the resource R are finished, T1 is a first time parameter and is related to the lower limit of the time window of resource reselection, and T2 is a second time parameter and is the upper limit of the time window of resource reselection.
In step 102, the T1 may require one or more of the following conditions to be satisfied:
under the condition 1, T1-tp is not lower than the processing time delay for resource reselection and data ready to be sent, wherein tp is the triggering moment of resource reselection;
and in the condition 2, T1 is more than or equal to Tn, and if the last reserved resource exists before the reserved resource, tn is the ending time of the last reserved resource.
In step 102, the T2 may require one or more of the following conditions to be satisfied:
in condition 1, T2 does not exceed the transmission Delay requirement of the remaining data packets of the transmission block, that is, T2 does not exceed the transmission Delay requirement (remaining PDB, packet Delay Budget) of the remaining data packets of the transmission block, that is, the transmission resource selected by the UE does not exceed the transmission Delay requirement of the remaining data packets.
And in the condition 2, the T2 is the upper limit of a resource selection window, and the resource selection window is a time window corresponding to the resource selection moment when the resource selection condition is met.
In condition 2, T2 corresponds to an upper limit of a resource selection time window of the UE at the previous time of triggering resource selection or reselection. Specifically, if the time of triggering or reselecting a resource on the originating UE is n, and the corresponding time window for selecting the resource is [ W1, W2], then W2 is T2.
And 3, if the next reserved resource exists after the reserved resource, T2 is the end time of the next reserved resource, and T2 is not less than T2 or T2 is not less than T2-Tgap, wherein the Tgap is the required time interval between two adjacent transmissions.
That is, when there is next reserved resource after the reserved resource R, the ending time of the next reserved resource is T2, as shown in fig. 1 (d), T2 is less than or equal to T2, or T2 is less than or equal to T2-Tgap, where Tgap is the time interval between two required adjacent transmissions.
It is further noted that the invention does not exclude that T1 and T2 contain other conditions than those mentioned above.
In step 102, the resource reselection time window is a time window for performing resource reselection for a certain reserved resource. The sending end UE can trigger resource reselection to one or more reserved resources according to the channel interception result, and the resource reselection time window corresponding to each reserved resource is determined according to the method.
Embodiment 1 of the present invention provides a channel access interception method, so that a sending-end UE can trigger a time window for resource reselection according to a channel interception result after sending an SCI, thereby defining a resource reselection rule.
Example 2:
fig. 2 (a) is a method flow of an embodiment of a channel access sensing method including a resource reselection trigger time, and fig. 2 (b) is a resource reselection trigger time determination manner of the embodiment of the channel access sensing method including the resource reselection trigger time.
The channel access interception method provided by embodiment 2 of the present invention includes determining a resource reselection trigger time, specifically:
Step 101 is the same as step 101 of embodiment 1 of the present invention, and the discussion is not repeated here.
And 102, determining a resource reselection time window when the condition of resource reselection is met before the next reserved resource sending time after the time t 0.
Step 102 is the same as step 102 of embodiment 1 of the present invention, and the discussion is not repeated here.
And 103, determining a resource reselection triggering time when the condition of resource reselection is met before the next reserved resource sending time after the time t 0.
In step 103, the resource reselection triggering time is a time when a resource reselection mechanism is started after the reserved resource is monitored to be occupied after the time t 0.
In step 103, the method for determining the resource reselection trigger time includes the following five methods:
in the method 1, the reserved resource is of type 1, type 2 or type 3, and the resource reselection triggering time is the time when the resource reselection condition is met.
In the method 1, when the sending end UE judges that the reserved resources meet the resource reselection conditions according to the channel interception result, the resource reselection is triggered immediately. Namely, if the originating UE determines that the resource reselection condition is satisfied at time x or x-Tproc0, the time x is taken as the resource reselection trigger time. Where Tproc0 is a time parameter for triggering preparation of resource reselection. It should be noted that the method is suitable for reserving resources of type 1, type 2 or type 3.
Optionally, in this method, if the sending time at which the originating UE selects the transmission resource is T1, the resource reselection is not triggered after T1-T3 accordingly. And T3 is a third time parameter used for triggering the process from resource reselection to data transmission preparation.
The condition that the reserved resources satisfy the resource reselection condition is specifically that one or more reserved resources after the time t0 satisfy the corresponding resource reselection condition.
The resource reselection condition for performing resource reselection on a certain reserved resource after the time t0 may be that the selected reserved resource is occupied by other equipment, and the measured corresponding resource interference is higher than a certain threshold; or the reserved resources need to be occupied by the higher priority service of the equipment; or other conditions determined according to a standard or device implementation. The measured resource interference may be measured in terms of associated reference signal received power.
And 2, for the reserved resource of type 1 or type 2, triggering the resource reselection for a certain reserved resource at the resource reselection triggering time, wherein the detected reserved resource meets the resource reselection condition when the transmission frequency of the transmission block corresponding to the reserved resource is lower than M (M is an integer greater than or equal to 1) times.
That is, for the reserved resource being type 1 or type 2, when the transmission frequency of the transmission block corresponding to a certain reserved resource is lower than M times after the time t0, and when the sending end UE determines that the reserved resource meets the resource reselection condition according to the channel listening result, the resource reselection is triggered immediately, otherwise, the resource reselection is not triggered. Namely, if the sending end UE judges that a certain reserved resource meets the resource reselection condition at the time x or x-Tpoc0 and the transmission frequency of the TB corresponding to the reserved resource is lower than M times, the time x is taken as the resource reselection triggering time, wherein the Tpoc0 is the processing delay of the UE.
It should be noted that the manner for the originating UE to obtain the M value information is to notify the M value information through a high layer signaling or a physical layer signaling by the network device or other terminal devices, or to obtain the M value information by a default or implemented manner by the device.
The method is suitable for the reserved resources of type 1 or type 2, namely the reserved resources are used for retransmission of one TB, and by the method, the number of times of resource reselection triggered by resource preemption can be effectively reduced, and the equipment overhead is reduced.
In the method 3, for the reserved resource being of type 1, type 2 or type 3, the determination manner of the resource reselection trigger time is as follows: if ts + W is larger than T1-T3, monitoring that the condition of resource reselection is met for one time or more times in a [ ts, T1-T3] time window, wherein the triggering time of the resource reselection is T1-T3; if ts + W is less than or equal to T1-T3, monitoring that the resource reselection condition is met for one time or more times in a [ ts, ts + W ] time window, wherein the triggering time of the resource reselection is ts + W; and so on until the data is sent.
If the current resource reselection triggering time is ts + W, ts +2W > < tm-T3, monitoring that the resource reselection condition is met for one time or multiple times in a [ T1+ W, tm-T3] time window, wherein the resource reselection triggering time is tm-T3; if ts +2W is less than or equal to tm-T3, monitoring that the condition of resource reselection is met once or for multiple times in a [ T1+ W, tm-T3] time window, wherein the triggering time of the resource reselection is ts +2W, as shown in fig. 2 (b); until the data is transmitted.
W is a reselection trigger time interval, ts is a channel interception starting time after T0, T1 is a transmission time of the first reserved resource, T3 is a third time parameter, and tm is a transmission time of the reserved resource corresponding to reselection at ts + W.
The one or more times of satisfaction of the resource reselection condition may be that the originating UE determines that the reserved resource satisfies the resource reselection condition through a channel measurement, a channel SCI detection, and the like at a certain time, and satisfies the resource reselection condition according to a latest channel measurement, a new SCI detection, and the like at a later certain time. The resource reselection condition is still satisfied at the time of the resource reselection trigger.
The method can also be described as that the UE at the sending end continuously monitors the channel at [ ts, min (ts + W, T1-T3) ], and when the resource reselection condition is judged to be still met at the time of min (ts + W, T1-T3) or min (ts + W, T1-T3) -Tproc0, the resource reselection is triggered at the time of min (ts + W, T1-T3). And the like until the data is sent.
And 4, for the reserved resources of type 1, type 2 or type 3, when the condition of resource reselection is monitored to be met for one time or more times in [ ts, T1-T3], the triggering time of the resource reselection is T1-T3.
Wherein ts is a channel sensing starting time, T1 is a sending time of the reserved resource, and T3 is a third time parameter.
In the method 4, if the moment when the originating UE starts channel sensing is ts, and the moment when the UE reserves resources for transmission is T1, the triggering moment is T1-T3 when the UE senses that the resources are preempted and the resource reselection needs to be triggered in [ ts, T1-T3 ].
The method can also be described as that the UE of the sending end continues channel interception after ts, and when the condition of resource reselection is judged to be still met at the moment of m-T3 or m-T3-Tproc0, the resource reselection is triggered at the moment of m-T3.
By the method, the originating UE triggers the resource reselection only once at most in the time window [ ts, T1-T3], so that the frequency of triggering the resource reselection can be effectively reduced, and the equipment overhead is reduced, and the method is suitable for the reserved resource of type 1, type 2 or type 3.
The method 5, for the reserved resource being type 2, the starting mode of the resource reselection is that if T1-T3 is more than or equal to th, the received HARQ feedback is NACK, and the next reserved resource after th is monitored to meet the resource reselection condition, and the resource reselection to the reserved resource is started; if T1-T3< th, detecting that the next reserved resource after th meets the resource reselection condition before T1-T3, and starting the resource reselection on the reserved resource; wherein, T1 is the sending time of the reserved resource, th is the time when HARQ feedback of the TB corresponding to the reserved resource ends before the reserved resource is sent, and T3 is a third time parameter after the transceiving conversion.
In the method 5, when the reserved resource is type 2, it is assumed that the time when the originating UE starts channel sensing is ts, the time when the UE transmits the reserved resource is t1, and it is assumed that HARQ feedback for the TB is finished before t1 and the transmission time after the transceiving conversion is th. And if T1-th is not lower than the processing time delay T3 for triggering resource reselection and preparing data transmission of the sending end UE, namely T1-T3 is not less than th, triggering resource reselection after the sending end UE receives the HARQ feedback. If the UE receives NACK feedback of the TB, the UE continues to monitor the resources after th, combines the channel monitoring result before th, and triggers resource reselection if judging that the resources of the retransmission TB are preempted and need to trigger resource reselection. Otherwise, if T1-T3 is less than th, the sending end UE triggers resource reselection according to the channel interception result before T1-T3 and if the resources of the retransmission TB are determined to be preempted and need to trigger resource reselection. The instant of triggering the resource reselection may be the instant trigger of method 1, or the instant trigger of method 2, which is triggered when the TB transmission is lower than M times, or the instant trigger of method 3, which is triggered at most once in the time window [0,W ], etc.
Optionally, a resource reselection trigger of resource preemption is not performed in [ T1-T3, T1], where the time parameter T3 is used for resource reselection and processing of preparing to send data. Namely, when the transmission time when the originating UE has notified the reserved resource is T1, the resource reselection triggering of resource preemption at the time T1 is not performed after T1-T3.
Further, the method 1, the method 2, the method 3, the method 4, and the method 5 have applicable reserved resource types, and when one resource reserved type is applicable to a plurality of methods to determine the resource reselection trigger time, if a set of conditions described in the plurality of methods are not mutually exclusive, a condition that is required to satisfy the conditions described in the plurality of methods may be configured, and if two conditions in the set are mutually exclusive, one of the two mutually exclusive conditions may be configured and selected. For example, method 2 and method 3 apply for reserved resource type 1, where method 2 includes two conditions that trigger resource reselection: condition 1: the number of TB transmissions corresponding to the reserved resource is less than M, and condition 2: when the condition 1 is met, the resource reselection is triggered immediately when the resource reselection is judged to be needed according to the channel interception result; method 3 includes a condition that triggers a resource reselection: condition a: and when the resource reselection is judged to be needed according to the channel interception result, the resource reselection is triggered at most once in a time window [0,W ]. It can be seen that the condition 1 of the method 2 and the condition a of the method 3 are not mutually exclusive, the condition 2 of the method 2 and the condition a of the method 3 are mutually exclusive, and for the reserved resource type 1, a mixed scheme employing the method 2, the method 3, or the method 2 and the method 3 may be configured in an actual system, for example, the condition a of the condition 1 of the method 2 and the condition a of the method 3 are satisfied.
Further, in the present invention, a time window and a time description are included, where the time is, for example, a time t0 at which the sending end UE notifies the reserved resource information, a reserved resource sending time t1, a trigger resource reselection trigger time tp, and the like, and a unit of the corresponding time may be one or more time slots, one or more symbols, or other time units, and is not limited specifically here. The time windows are [ T1, T2], [ T1-T3, T1], [ ts, ts + W ], and the like, the length of the corresponding time window depends on T1, T2, T3, W, and the corresponding time unit may be one or more time slots, or one or more symbols, or other time, which is not limited herein. And the units of the respective time parameters T1, T2, T3, W may be the same or different. The method for the originating UE to obtain the time parameters T1, T2, T3, and W may be that the time parameters are notified by a network device or other terminal devices through a high-level signaling or a physical layer signaling, or obtained by a default or implemented manner of the device.
Further, one or more of the time parameters T1, T2, T3, and W may reach the originating UE data, and the time parameter in the resource selection window design when the transmission resource is selected to initiate the initial channel access according to the channel sensing is the same set of configuration parameters, or is a set of parameters that triggers independent configuration of resource reselection for the reserved resource that is preempted.
The embodiment of the invention provides a channel access interception method which can be used for a sending terminal of side link communication.
Example 3:
fig. 3 is an embodiment of a channel access sensing terminal device, which uses the method in embodiments 1 to 2 of the present invention, and as embodiment 5 of the present invention, a channel access sensing terminal device, including: the device comprises a monitoring module 1, a determining module 2 and a sending module 3.
The sending module is used for sending the side link control information and indicating the resource to send data by using the information; the monitoring module is used for monitoring the channel state before the sending time of the reserved resource; and the determining module is used for determining the resource reselection triggering time and the resource reselection time window based on the channel interception result.
In embodiment 3 of the present invention, the manner of determining the resource reselection trigger time and the resource reselection time window is discussed in detail in embodiments 1 to 2 of the present invention, and will not be discussed repeatedly here.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (8)
1. A channel access sensing method for enabling resource reselection for reserved resources, comprising the steps of:
sending side link control information, wherein the side link control information is used for indicating reserved resources of next or multiple transmissions;
the reserved resources include three types:
type 1, the reserved resource is a retransmission resource of a transport block, and no transmission feedback of the transport block occurs before the transmission time of the reserved resource;
type 2, the reserved resource is a retransmission resource of a transmission block, and the sending time of the reserved resource is after the transmission feedback of the transmission block;
type 3, the reserved resource is a first transmission resource of a transmission block;
before the next reserved resource sending time after the side link control information is sent, when a certain reserved resource is sensed to meet a resource reselection condition, determining a resource reselection time window:
if the reserved resource needing resource reselection is the type 1 or the type 3, the resource reselection time window is [ T1, T2];
if the reserved resource needing resource reselection is the type 2, the resource reselection time window is [ tx, T2], tx = max (th, T1);
wherein th is a time before the reserved resource needing resource reselection is sent, when the HARQ feedback of the transport block corresponding to the reserved resource is finished, and after the transceiving conversion, T1 is a preset first time parameter, and T2 is a preset second time parameter;
the T1 at least satisfies the following condition:
under the condition 1, T1-tp is not lower than the processing time delay for resource reselection and data ready to be sent, wherein tp is the triggering moment of resource reselection;
in the condition 2, T1 is more than or equal to Tn, if the last reserved resource exists before the reserved resource, tn is the ending time of the last reserved resource;
the T2 at least satisfies one of the following conditions:
the condition 1 is that the T2 does not exceed the transmission delay requirement of the residual data packet of the transmission block;
the method comprises the following steps that (1) according to a condition 2, wherein T2 is the upper limit of a resource selection window, and the resource selection window is a time window corresponding to the resource selection moment when the resource selection condition is met;
and 3, if the next reserved resource exists after the reserved resource, T2 is the end time of the next reserved resource, and T2 is not less than T2 or T2 is not less than T2-Tgap, wherein the Tgap is the required time interval between two adjacent transmissions.
2. The channel access sensing method of claim 1, wherein the method further comprises:
and determining the triggering time of the resource reselection when the condition of the resource reselection is met before the next reserved resource sending time after the side link control information.
3. The channel access listening method of claim 1, wherein for the reserved resource being type 1, type 2 or type 3, the resource reselection triggering time is a time when a resource reselection condition is listened to be satisfied.
4. The channel access listening method of claim 1, wherein for the reserved resource being of type 1 or type 2, the resource reselection triggering time for triggering resource reselection for a certain reserved resource is a time when the number of transmissions of a transport block corresponding to the reserved resource is less than M (M is an integer greater than or equal to 1) times, and the monitored reserved resource satisfies the resource reselection condition.
5. The channel access sensing method of claim 1, wherein for the reserved resource being type 1, type 2 or type 3, the resource reselection trigger time is determined by:
if ts + W is larger than T1-T3, monitoring that the resource reselection condition is met for one time or more times in a [ ts, T1-T3] time window, and setting the triggering time of the resource reselection as T1-T3;
if ts + W is less than or equal to T1-T3, monitoring that the resource reselection condition is met for one time or more times in a [ ts, ts + W ] time window, and setting the resource reselection triggering time to be ts + W;
repeating the steps until the data are sent;
w is a reselection trigger time interval, ts is a current channel monitoring start time, T1 is a transmission time of a next reserved resource at the current time, and T3 is a third time parameter.
6. The channel access sensing method of claim 1, wherein for the reserved resource being type 1, type 2 or type 3, when it is sensed in [ ts, T1-T3] that the resource reselection condition is met one or more times, the resource reselection trigger time is T1-T3, where ts is a channel sensing start time, T1 is a transmission time of a next reserved resource at a current time, and T3 is a third time parameter.
7. The channel access sensing method of claim 1, wherein for the reserved resource being type 2, resource reselection is enabled in such a way that,
if T1-T3 is more than or equal to th, the received HARQ feedback is NACK, the reserved resource is monitored to meet the resource reselection condition, and the resource reselection is started;
if T1-T3< th, before T1-T3, the reserved resources are monitored to meet the resource reselection condition, and resource reselection is started;
wherein, T1 is the transmission time of the next reserved resource at the current time, th is the time before the transmission of the reserved resource and after the HARQ feedback of the transport block corresponding to the reserved resource is finished, and T3 is a third time parameter.
8. A channel access interception terminal apparatus using the method of any one of claims 1 to 7, comprising: the device comprises a monitoring module, a determining module and a sending module;
the sending module is used for sending side link control information;
the monitoring module is used for monitoring the channel state before the sending time of the reserved resource;
and the determining module is used for determining the resource reselection triggering time and the resource reselection time window based on the channel interception result.
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| CN111885619B (en) * | 2020-06-24 | 2023-01-17 | 中国信息通信研究院 | Channel monitoring method and terminal equipment |
| CN113890697B (en) * | 2020-07-02 | 2023-04-18 | 维沃移动通信有限公司 | Method and device for notifying side link auxiliary information and electronic equipment |
| WO2022032671A1 (en) * | 2020-08-14 | 2022-02-17 | Nec Corporation | Methods for communication, terminal device, and computer readable media |
| WO2024035206A1 (en) * | 2022-08-11 | 2024-02-15 | 엘지전자 주식회사 | Resource reevaluation or preemption-based resource reselection operation method and device in unlicensed band |
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