CN110351862B - Method, device, base station and user equipment for realizing retransmission based on scheduling - Google Patents
Method, device, base station and user equipment for realizing retransmission based on scheduling Download PDFInfo
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- CN110351862B CN110351862B CN201810290235.7A CN201810290235A CN110351862B CN 110351862 B CN110351862 B CN 110351862B CN 201810290235 A CN201810290235 A CN 201810290235A CN 110351862 B CN110351862 B CN 110351862B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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- H—ELECTRICITY
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- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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Abstract
The invention provides a method, a device, a base station and user equipment for realizing resending based on scheduling. On the base station side, the method comprises: sending the same uplink scheduling grant to at least one user equipment by using the DCI scrambled by the group identifier, wherein the uplink scheduling grant comprises: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool. The invention can reduce the resource waste of the control channel and improve the resource utilization rate of the system.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method, an apparatus, a base station, and a user equipment for implementing retransmission based on scheduling.
Background
In the Release15 standardization process, 3GPP (3 rd Generation Partnership Project) has been discussed to reach agreement to support schedule-free based uplink transmission (configured grant UL transmission). For scheduling-free uplink transmission, when a user has data to send, the user does not need to send an uplink scheduling request in advance, and can directly send the data on scheduling-free uplink transmission resources. Uplink transmission based on scheduling-free is divided into two types, wherein the type I is only a Radio Resource Control (RRC) configuration type, that is, all parameters related to the scheduling-free uplink transmission are configured by the RRC, and after the RRC configuration is completed, a user can perform uplink transmission according to own service requirements without additional scheduling information; type II is a type combining RRC configuration and L1 signaling activation/deactivation, and L1 signaling may also implement function modification. For type II, after RRC configuration is completed and L1 signaling activation is received, the user may perform uplink transmission according to the service requirement of the user, and deactivate scheduling-free uplink transmission after receiving the L1 signaling indicating deactivation.
At present, two modes of repeated transmission (Repetition) and Retransmission (Retransmission) are adopted to ensure the reliability of the scheduling-free uplink transmission. As shown in fig. 1, a user continuously and repeatedly sends a TB (transport block) K times on a non-scheduling uplink transmission resource, where the same HARQ (Hybrid Automatic Repeat reQuest) process number is used for the K times of transmission, and the user does not receive explicit ACK related to the previous transmission during the K times of transmission, and when the number of transmission times reaches K times, the user regards as an implicit ACK for the TB.
For the Scheduling-free uplink transmission, the retransmission is based on Scheduling, as shown in fig. 2, that is, for a TB transmitted on the uplink Scheduling-free transmission resource, the user receives a Scheduling grant for retransmitting the TB, the Scheduling grant is scrambled by using a CS-RNTI (Configured Scheduling-RNTI), the user performs Scheduling-based retransmission for the same TB according to Scheduling information included in the Scheduling grant, and for the same TB, the Scheduling-based retransmission and the Scheduling-free transmission need to use the same HARQ process number. And the user is obtained by calculating the HARQ process number corresponding to scheduling-free transmission according to the symbol identification of the time domain resource occupied by the transmission. And the user obtains the HARQ process number corresponding to the scheduling retransmission through the uplink scheduling authorization sent by the base station.
For scheduling-based retransmission without scheduling uplink transmission, scheduling grants are scrambled by the CS-RNTI of the user, and one scheduling grant can schedule only one user for retransmission. For the non-orthogonal multiple access technology, uplink data of multiple users can be simultaneously transmitted in a superposition manner on the same scheduling-free time-frequency resource, and similarly, uplink data of multiple users can be simultaneously retransmitted in a superposition manner on the same time-frequency resource. Therefore, for a plurality of users performing scheduling-free transmission by using the non-orthogonal multiple access technique, if retransmission is performed by scheduling, scheduling grants need to be transmitted to the plurality of users, respectively, which results in a waste of resources of a control channel.
Disclosure of Invention
The method, the device, the base station and the user equipment for realizing the retransmission based on the scheduling can reduce the resource waste of the control channel and improve the resource utilization rate of the system.
In a first aspect, the present invention provides a method for implementing retransmission based on scheduling, where the method is applied to a base station, and the method includes:
sending the same uplink scheduling grant to at least one user equipment by using the DCI scrambled by the group identifier, wherein the uplink scheduling grant comprises: each bit in the bit map corresponds to the DMRS in the DMRS pool one by one; time-frequency domain information for indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time-frequency resource in the time-frequency resource pool.
Optionally, before the sending the same uplink scheduling grant to at least one user equipment through the DCI scrambled with the group identifier, the method further includes:
receiving data transmitted by the at least one user equipment on the same scheduling-free resource.
Optionally, the method further comprises:
and configuring a mapping relation between the group identifier and the time-frequency resource and a mapping relation between the bit bitmap and the DMRS in the DMRS pool for the user equipment in advance.
Optionally, the mapping relationship between the group identifier and the time-frequency resource includes: the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier and the total number of RBs contained in a frequency domain; or, each group identifier is uniquely associated with a time-frequency resource range.
Optionally, a value of a bit in the bitmap is 1, which indicates that the user equipment which performs scheduling-free uplink transmission by using the DMRS corresponding to the bit is scheduled to perform retransmission;
the value of the bit in the bit bitmap being 0 indicates that the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is stopped or the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is continued.
In a second aspect, the present invention provides a method for implementing retransmission based on scheduling, where the method is applied to a user equipment, and the method includes:
receiving the same uplink scheduling grant sent by the base station to at least one user equipment through the DCI scrambled by the group identifier, wherein the uplink scheduling grant comprises: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identification is uniquely corresponding to one time frequency resource in the time frequency resource pool;
determining a group identifier corresponding to the base station according to the time frequency resource where the scheduling-free uplink transmission is carried out and the mapping relation between the group identifier and the time frequency resource pre-configured by the base station;
judging whether the group identification corresponding to the self is consistent with the group identification scrambling the uplink scheduling authorization;
when the group identification corresponding to the base station is consistent with the group identification scrambling the uplink scheduling authorization, determining the bit corresponding to the base station in the bit bitmap according to the DMRS adopted by the base station for scheduling-free uplink transmission and the mapping relation between the bit bitmap and the DMRS pre-configured by the base station;
and according to the value of the bit corresponding to the bit map, the uplink scheduling authorization is selected to be retransmitted based on scheduling or discarded according to the time-frequency domain information in the uplink scheduling authorization.
Optionally, the selecting, according to the value of the bit corresponding to the bit map, to resend or discard the uplink scheduling grant based on scheduling according to the time-frequency domain information in the uplink scheduling grant includes:
when the value of the corresponding bit in the bitmap is 1, retransmitting based on scheduling according to the time-frequency domain information in the uplink scheduling authorization;
and when the value of the corresponding bit in the bit bitmap is 0, discarding the uplink scheduling authorization.
Optionally, the method further comprises:
and when the group identifier corresponding to the uplink scheduling authorization is inconsistent with the group identifier scrambling the uplink scheduling authorization, discarding the uplink scheduling authorization.
Optionally, the discarding the uplink scheduling grant includes: stopping the scheduling-free uplink transmission or continuing the scheduling-free uplink transmission.
In a third aspect, the present invention provides an apparatus for implementing retransmission based on scheduling, where the apparatus is located at a base station, and the apparatus includes:
a sending unit, configured to send the same uplink scheduling grant to at least one user equipment through the DCI scrambled by using the group identifier, where the uplink scheduling grant includes: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool.
Optionally, the apparatus further comprises:
a first receiving unit, configured to receive data transmitted by at least one user equipment on the same scheduling-free resource before the sending unit sends the same uplink scheduling grant to the at least one user equipment through the DCI scrambled by using the group identifier.
Optionally, the apparatus further comprises:
and the configuration unit is used for configuring the mapping relation between the group identifier and the time-frequency resource and the mapping relation between the bit bitmap and the DMRS in the DMRS pool for the user equipment in advance.
Optionally, the mapping relationship between the group identifier and the time-frequency resource includes: the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier and the total number of RBs contained in a frequency domain; or, each group identifier is uniquely associated with a time-frequency resource range.
Optionally, a value of a bit in the bitmap is 1, which indicates that the user equipment which performs scheduling-free uplink transmission by using the DMRS corresponding to the bit is scheduled to perform retransmission;
the value of the bit in the bit bitmap being 0 indicates that the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is stopped or the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is continued.
In a fourth aspect, the present invention provides an apparatus for implementing scheduling-based retransmission, where the apparatus is located in a user equipment, and the user equipment includes:
a second receiving unit, configured to receive the same uplink scheduling grant that is sent by the base station to at least one user equipment by using the DCI scrambled by the group identifier, where the uplink scheduling grant includes: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identification is uniquely corresponding to one time frequency resource in the time frequency resource pool;
the first determining unit is used for determining a group identifier corresponding to the first determining unit according to the time frequency resource where the scheduling-free uplink transmission is carried out and the mapping relation between the group identifier and the time frequency resource pre-configured by the base station;
the judging unit is used for judging whether the group identifier corresponding to the judging unit is consistent with the group identifier scrambling the uplink scheduling authorization;
a second determining unit, configured to determine, when a group identifier corresponding to the second determining unit is consistent with a group identifier obtained by scrambling the uplink scheduling grant, a bit corresponding to the second determining unit in the bit map according to the DMRS used for scheduling-free uplink transmission and a mapping relationship between the bit map and the DMRS pre-configured by the base station;
and the first processing unit is used for selecting to resend or discard the uplink scheduling grant based on scheduling according to the time-frequency domain information in the uplink scheduling grant according to the value of the corresponding bit in the bit map.
Optionally, the first processing unit includes:
the first processing module is used for carrying out scheduling-based resending according to the time-frequency domain information in the uplink scheduling grant when the value of the bit corresponding to the first processing module in the bit map is 1;
and the second processing module is used for discarding the uplink scheduling grant when the value of the corresponding bit in the bit map is 0.
Optionally, the apparatus further comprises:
and the second processing unit is used for discarding the uplink scheduling grant when the group identifier corresponding to the second processing unit is inconsistent with the group identifier scrambling the uplink scheduling grant.
Optionally, the second processing module or the second processing unit is configured to stop the scheduling-free uplink transmission or continue the scheduling-free uplink transmission.
In a fifth aspect, the present invention provides a base station, where the base station includes the above-mentioned apparatus for implementing scheduling-based retransmission at the base station.
In a sixth aspect, the present invention provides a ue, where the ue includes the above apparatus for implementing scheduling-based retransmission in a ue.
According to the method, the device, the base station and the user equipment for realizing the retransmission based on the scheduling, the base station only sends one scheduling authorization to the plurality of user equipment, and the plurality of user equipment can perform the retransmission based on the scheduling on the same time-frequency resource according to the scheduling authorization, so that the resource waste of a control channel can be effectively reduced, the repeated transmission based on the scheduling of part of users can be flexibly adjusted according to the load condition of scheduling-free resources, and the utilization rate of system resources is improved.
Drawings
FIG. 1 is a schematic flow chart of scheduling-free retransmission in the prior art;
FIG. 2 is a flow chart illustrating a scheduling-based retransmission in the prior art;
FIG. 3 is a flowchart of a method for implementing scheduling-based retransmission according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for implementing scheduling-based retransmission according to another embodiment of the present invention;
fig. 5 is a schematic time-frequency resource diagram of scheduling-free transmission performed on the same time-frequency resource by multiple users according to the embodiment of the present invention;
fig. 6 is a schematic diagram of a DMRS pool provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of a mapping relationship between DMRSs in a DMRS pool and bits in a bit map according to an embodiment of the present invention;
fig. 8, fig. 9 and fig. 10 are schematic structural diagrams of an apparatus for implementing scheduling-based retransmission at a base station according to an embodiment of the present invention;
fig. 11, fig. 12, and fig. 13 are schematic structural diagrams of an apparatus for implementing scheduling-based retransmission on a user equipment according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
An embodiment of the present invention provides a method for implementing retransmission based on scheduling, where the method is applied to a base station, and as shown in fig. 3, the method includes:
s11, a base station sends the same uplink scheduling grant to at least one ue through a DCI (Downlink Control Information) scrambled by a group identifier, where the uplink scheduling grant includes: each bit in the bitmap corresponds to a DMRS (Demodulation Reference Signal) in a DMRS pool in a one-to-one manner; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool.
Further, the base station first receives data transmitted by at least one user equipment on the same scheduling-free resource, and then the base station transmits the same uplink scheduling grant to the at least one user equipment by using the DCI scrambled by the group identifier.
The method for realizing retransmission based on scheduling provided by the embodiment of the invention has the advantages that the base station only sends one scheduling authorization to the plurality of user equipment, and the plurality of user equipment can perform retransmission based on scheduling on the same time-frequency resource according to the scheduling authorization, so that the resource waste of a control channel can be effectively reduced, the repeated transmission based on scheduling of part of users can be flexibly adjusted according to the load condition of scheduling-free resources, and the utilization rate of system resources is improved.
Specifically, the information included in the uplink scheduling grant sent to the at least one ue at least includes: a bit map (bitmap), each bit uniquely corresponds to one DMRS in the DMRS pool, the value of the bit is 0, the scheduling authorization does not schedule the user equipment which adopts the DMRS for scheduling-free uplink transmission to retransmit, and the scheduling-free transmission of the user equipment which adopts the DMRS for scheduling-free uplink transmission is stopped or is continued; the bit value of 1 indicates that the scheduling authorization schedules the user equipment which adopts the DMRS to perform scheduling-free uplink transmission for retransmission; a time domain resource allocation field for indicating a range of time domain resources for the scheduling based retransmission, and a frequency domain resource allocation field for indicating a range of frequency domain resources for the scheduling based retransmission.
The base station sends uplink scheduling authorization periodically through a common control channel, DCI sending the scheduling authorization is scrambled by group identification (group ID), wherein one group identification is uniquely corresponding to one time frequency resource of a time frequency resource pool, the mapping relation between the group identification and the time frequency resource is configured for the user equipment by the base station, and the user equipment can acquire the group identification corresponding to the time frequency resource according to the time frequency resource for uplink scheduling-free transmission.
The size of the bitmap is equal to the number of the DMRSs contained in the DMRS pool, one bit of the bitmap is uniquely corresponding to one DMRS in the DMRS pool, the mapping relation is configured for user equipment by a base station, and a user can know the indication position of the user in the bitmap according to the DMRS used for uplink scheduling-free transmission.
The base station can pre-configure the mapping relation between the group identifier and the time frequency resource and the mapping relation between the bit bitmap and the DMRS in the DMRS pool for the user equipment, so that when the user performs uplink scheduling-free transmission, the corresponding group identifier can be determined according to the transmitted time frequency resource and the mapping relation between the group identifier and the time frequency resource pre-configured for the user equipment by the base station, and the corresponding position of the user equipment in the bit bitmap can be determined according to the adopted DMRS for transmission and the mapping relation between the bit bitmap and the DMRS pre-configured for the user equipment by the base station.
Specifically, the mapping relationship between the group identifier and the time-frequency resource may include: the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier and the total number of RBs contained in a frequency domain; or, each group identifier is uniquely associated with a time-frequency resource range.
An embodiment of the present invention provides a method for implementing retransmission based on scheduling, where the method is applied to a user equipment, and as shown in fig. 4, the method includes:
s21, receiving the same uplink scheduling grant sent by the base station to at least one user equipment through the DCI scrambled by the group identifier, wherein the uplink scheduling grant comprises: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool.
S22, determining the corresponding group identification according to the time frequency resource where the scheduling-free uplink transmission is carried out and the mapping relation between the group identification and the time frequency resource configured in advance by the base station.
And S23, judging whether the group identification corresponding to the user is consistent with the group identification scrambling the uplink scheduling authorization.
And S24, when the group identifier corresponding to the base station is consistent with the group identifier scrambling the uplink scheduling authorization, determining the bit corresponding to the base station in the bit bitmap according to the DMRS adopted by the base station for scheduling-free uplink transmission and the mapping relation between the bit bitmap and the DMRS pre-configured by the base station.
And S25, according to the value of the bit corresponding to the bit map, the uplink scheduling authorization is selected to be retransmitted based on scheduling or discarded according to the time-frequency domain information in the uplink scheduling authorization.
The method for implementing the retransmission based on the scheduling provided by the embodiment of the invention receives the same scheduling authorization sent by the base station aiming at the plurality of user equipment, and the plurality of user equipment can perform the retransmission based on the scheduling on the same time-frequency resource according to the scheduling authorization, thereby effectively reducing the resource waste of the control channel.
Specifically, the user equipment monitors uplink scheduling authorization according to a sending period of the base station, compares whether a group identifier scrambled by the uplink scheduling authorization is consistent with a group identifier corresponding to the user equipment, further determines a bit value of a corresponding position in a bit map if the group identifier scrambled by the uplink scheduling authorization is consistent with the group identifier corresponding to the user equipment, and discards the scheduling authorization if the bit value is 0; and if the bit value is 1, retransmitting based on scheduling according to the time-frequency domain information indicated by the uplink scheduling authorization. If the group identifier scrambled by the uplink scheduling grant is inconsistent with the group identifier corresponding to the uplink scheduling grant, discarding the scheduling grant, which may specifically be: stopping the scheduling-free uplink transmission or continuing the scheduling-free uplink transmission.
The following describes the method for implementing retransmission based on scheduling according to the present invention in detail with reference to specific embodiments.
In this embodiment, there are six users, i.e., users 1-6, in the system, at time T1, the users 1-6 perform scheduling-free transmission on the same time-frequency resource by using different non-orthogonal multiple access characteristic elements (such as codewords, etc.), and respectively send data transmission blocks TB1-TB6, where the data of different users are superimposed together, and at the base station side, the data of multiple users can be distinguished by an advanced receiver. Wherein, the starting time of the time domain resource is T1, and the length is D symbols; the frequency domain Resource start RB (Resource Block) is identified as PRB X1 and is L RBs in length, as shown in fig. 5.
The users 1-6 confirm that the time domain resource starting time is T1 and the length is D symbols, the frequency domain resource starting RB identifier is a group identifier corresponding to PRB X1 and the total number is L RBs, and in this embodiment, the group identifier is K1, according to the mapping relationship between the group identifier and the time frequency resource pre-configured by the base station.
Specifically, the mapping relationship between the group identifier preconfigured by the base station and the time-frequency resource may be configured in a functional manner, for example, the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier, and a total number of RBs included in a frequency domain, and when the user performs scheduling-free transmission, a value of the group identifier may be calculated according to a specific value of the time-frequency resource. Another configuration method is that the base station uniquely associates a time frequency resource range for each group identifier, and when the user performs scheduling-free transmission, the group identifier can be determined according to the actual time frequency resource range.
The base station pre-configures the mapping relation between each DMRS in the DMRS pool and the bit bitmap in the uplink scheduling authorization for the users 1-6. In this embodiment, there are 8 DMRSs in the DMRS pool, and two DMRS initial sequences are combined with four ports of 1-symbol DMRS configuration type 1, as shown in fig. 6. In this embodiment, the mapping relationship configured by the base station for the user is as follows: DMRSs 1-8 in the DMRS pool are sequentially mapped to upper to lower bits in a bit map, as shown in fig. 7. DMRSs adopted by the users 1-6 for scheduling-free transmission on the time frequency resources are DMRSs 1-DMRS 6 respectively.
At time T2, the users 1 to 6 monitor the uplink scheduling grant transmitted by the group common control channel, and determine, through decoding, that the group identifier used for scrambling the uplink scheduling grant is K1, which is the same as the group identifiers corresponding to the six users at the time-domain resource starting time T1, the length of the six users is D symbols, the frequency-domain resource starting RB identifier is PRB X1, and the total number of the six users is L RBs, so that it is determined that the uplink scheduling grant is a scheduling-based retransmission grant for data transmitted over the time-frequency resource range.
Further, the users 1-6 determine whether to retransmit through the corresponding positions of their respective DMRSs in the bitmap. In this embodiment, the value of the uplink scheduling grant bitmap is [ 11011011000 ], and therefore, it can be determined according to the value of each bit:
An embodiment of the present invention further provides a device for implementing retransmission based on scheduling, where the device is located in a base station, and as shown in fig. 8, the device includes:
a sending unit 11, configured to send the same uplink scheduling grant to at least one user equipment through the DCI scrambled by using the group identifier, where the uplink scheduling grant includes: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information for indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool.
Optionally, as shown in fig. 9, the apparatus further includes:
a first receiving unit 12, configured to receive data transmitted by at least one user equipment on the same scheduling-free resource before the transmitting unit 11 transmits the same uplink scheduling grant to the at least one user equipment through the DCI scrambled by using the group identifier.
Optionally, as shown in fig. 10, the apparatus further includes:
a configuration unit 13, configured to configure, in advance, a mapping relationship between the group identifier and the time-frequency resource and a mapping relationship between the bitmap and the DMRS in the DMRS pool for the user equipment.
Optionally, the mapping relationship between the group identifier and the time-frequency resource includes: the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier and the total number of RBs contained in a frequency domain; or, each group identifier is uniquely associated with a time-frequency resource range.
Optionally, a value of a bit in the bitmap is 1, which indicates that the user equipment which performs scheduling-free uplink transmission by using the DMRS corresponding to the bit is scheduled to perform retransmission;
the value of the bit in the bit bitmap being 0 indicates that the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is stopped or the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is continued.
According to the device for realizing the retransmission based on the scheduling, provided by the embodiment of the invention, the base station only sends one scheduling authorization to the plurality of user equipment, and the plurality of user equipment can perform the retransmission based on the scheduling on the same time-frequency resource according to the scheduling authorization, so that the resource waste of a control channel can be effectively reduced, the repeated transmission based on the scheduling can be flexibly adjusted for part of users according to the load condition of the scheduling-free resource, and the resource utilization rate of a system is improved.
The apparatus of this embodiment may be configured to implement the technical solution of the method embodiment applied to the base station, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides another apparatus for implementing retransmission based on scheduling, where the apparatus is located in a user equipment, as shown in fig. 11, and the apparatus includes:
a second receiving unit 21, configured to receive the same uplink scheduling grant that is sent by the base station to at least one user equipment by using the DCI scrambled by the group identifier, where the uplink scheduling grant includes: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identification is uniquely corresponding to one time frequency resource in the time frequency resource pool;
a first determining unit 22, configured to determine a group identifier corresponding to the first determining unit according to a time-frequency resource where scheduling-free uplink transmission is performed and a mapping relationship between a group identifier preconfigured by the base station and the time-frequency resource;
a judging unit 23, configured to judge whether a group identifier corresponding to the judging unit is consistent with a group identifier obtained by scrambling the uplink scheduling grant;
a second determining unit 24, configured to determine, when a group identifier corresponding to the second determining unit is consistent with the group identifier obtained by scrambling the uplink scheduling grant, a bit corresponding to the second determining unit in the bit map according to the DMRS used for scheduling-free uplink transmission and a mapping relationship between the bit map and the DMRS pre-configured by the base station;
and the first processing unit 25 is configured to select, according to a value of a bit corresponding to the first processing unit in the bitmap, to perform retransmission based on scheduling according to the time-frequency domain information in the uplink scheduling grant or discard the uplink scheduling grant.
Optionally, as shown in fig. 12, the first processing unit includes:
a first processing module 251, configured to, when a value of a bit corresponding to the first processing module in the bitmap is 1, perform scheduling-based retransmission according to the time-frequency domain information in the uplink scheduling grant;
the second processing module 252 is configured to discard the uplink scheduling grant when a value of a bit corresponding to the second processing module in the bitmap is 0.
Optionally, as shown in fig. 13, the apparatus further includes:
and the second processing unit 26 is configured to discard the uplink scheduling grant when the group identifier corresponding to the second processing unit is inconsistent with the group identifier obtained by scrambling the uplink scheduling grant.
Optionally, the second processing module 252 or the second processing unit 26 is configured to stop the scheduling-free uplink transmission or continue the scheduling-free uplink transmission.
The apparatus of this embodiment may be configured to execute the technical solution of the method embodiment applied to the ue, and the implementation principle and the technical effect are similar, which are not described herein again.
The device for realizing the retransmission based on the scheduling provided by the embodiment of the invention receives the same scheduling authorization sent by the base station aiming at the plurality of user equipment, and the plurality of user equipment can perform the retransmission based on the scheduling on the same time-frequency resource according to the scheduling authorization, thereby effectively reducing the resource waste of the control channel.
The embodiment of the invention also provides a base station which comprises the device for realizing the resending based on the scheduling positioned in the base station.
The embodiment of the invention also provides the user equipment which comprises the device for realizing the resending based on the scheduling positioned in the user equipment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (20)
1. A method for implementing retransmission based on scheduling, the method is applied to a base station, and is characterized in that the method comprises the following steps:
sending the same uplink scheduling grant to at least one user equipment by using the DCI scrambled by the group identifier, wherein the uplink scheduling grant comprises: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool.
2. The method of claim 1, wherein before the transmitting the same uplink scheduling grant to at least one user equipment through the DCI scrambled with the group identity, the method further comprises:
receiving data transmitted by the at least one user equipment on the same scheduling-free resource.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
and configuring a mapping relation between the group identifier and the time-frequency resource and a mapping relation between the bit bitmap and the DMRS in the DMRS pool for the user equipment in advance.
4. The method of claim 3, wherein the mapping relationship between the group identifier and the time-frequency resource comprises: the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier and the total number of RBs contained in a frequency domain; or, each group identifier is uniquely associated with a time-frequency resource range.
5. The method according to any one of claims 1 to 2, wherein a value of 1 for a bit in the bitmap indicates that a user equipment that performs scheduling-free uplink transmission using the DMRS corresponding to the bit is scheduled for retransmission;
the value of the bit in the bit bitmap being 0 indicates that the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is stopped or the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is continued.
6. A method for implementing retransmission based on scheduling, the method is applied to user equipment, and is characterized in that the method comprises the following steps:
receiving the same uplink scheduling grant sent by the base station to at least one user equipment through the DCI scrambled by the group identifier, wherein the uplink scheduling grant comprises: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identification is uniquely corresponding to one time frequency resource in the time frequency resource pool;
determining a group identifier corresponding to the base station according to the time frequency resource where the scheduling-free uplink transmission is carried out and the mapping relation between the group identifier and the time frequency resource pre-configured by the base station;
judging whether the group identification corresponding to the self is consistent with the group identification scrambling the uplink scheduling authorization;
when the group identification corresponding to the base station is consistent with the group identification scrambling the uplink scheduling authorization, determining the bit corresponding to the base station in the bit bitmap according to the DMRS adopted by the base station for scheduling-free uplink transmission and the mapping relation between the bit bitmap and the DMRS pre-configured by the base station;
and according to the value of the bit corresponding to the bit map, the uplink scheduling authorization is selected to be retransmitted based on scheduling or discarded according to the time-frequency domain information in the uplink scheduling authorization.
7. The method of claim 6, wherein the selecting, according to the value of the bit corresponding to the bit map, to resend or discard the uplink scheduling grant based on scheduling according to the time-frequency domain information in the uplink scheduling grant comprises:
when the value of the corresponding bit in the bitmap is 1, retransmitting based on scheduling according to the time-frequency domain information in the uplink scheduling authorization;
and when the value of the corresponding bit in the bitmap is 0, discarding the uplink scheduling grant.
8. The method of claim 6, further comprising:
and when the group identifier corresponding to the uplink scheduling authorization is inconsistent with the group identifier scrambling the uplink scheduling authorization, discarding the uplink scheduling authorization.
9. The method according to claim 7 or 8, wherein the discarding the uplink scheduling grant comprises: stopping the scheduling-free uplink transmission or continuing the scheduling-free uplink transmission.
10. An apparatus for implementing scheduling-based retransmission, the apparatus being located at a base station, the apparatus comprising:
a sending unit, configured to send the same uplink scheduling grant to at least one user equipment through the DCI scrambled by using the group identifier, where the uplink scheduling grant includes: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identifier uniquely corresponds to one time frequency resource in the time frequency resource pool.
11. The apparatus of claim 10, further comprising:
a first receiving unit, configured to receive data transmitted by at least one user equipment on the same scheduling-free resource before the sending unit sends the same uplink scheduling grant to the at least one user equipment through the DCI scrambled by using the group identifier.
12. The apparatus of claim 10 or 11, further comprising:
and the configuration unit is used for configuring the mapping relation between the group identifier and the time frequency resource and the mapping relation between the bitmap and the DMRS in the DMRS pool for the user equipment in advance.
13. The apparatus of claim 12, wherein the mapping relationship between the group identifier and the time-frequency resource comprises: the group identifier is a function of a time domain starting time, a time domain length, a frequency domain starting RB identifier and the total number of RBs contained in a frequency domain; or, each group identifier is uniquely associated with a time-frequency resource range.
14. The apparatus according to any one of claims 10 to 11, wherein a value of 1 for a bit in the bitmap indicates that a user equipment that performs scheduling-free uplink transmission using the DMRS corresponding to the bit is scheduled for retransmission;
the value of the bit in the bit bitmap being 0 indicates that the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is stopped or the scheduling-free transmission of the user equipment which performs the scheduling-free uplink transmission by using the DMRS corresponding to the bit is continued.
15. An apparatus for implementing scheduling-based retransmission, the apparatus being located in a user equipment, the user equipment comprising:
a second receiving unit, configured to receive the same uplink scheduling grant that is sent by the base station to at least one user equipment by using the DCI scrambled by the group identifier, where the uplink scheduling grant includes: each bit in the bit map corresponds to the DMRS in the DMRS pool in a one-to-one mode; time-frequency domain information indicating a time-frequency domain resource range for scheduling-based retransmission; the group identification is uniquely corresponding to one time frequency resource in the time frequency resource pool;
the first determining unit is used for determining a group identifier corresponding to the first determining unit according to the time frequency resource where the scheduling-free uplink transmission is carried out and the mapping relation between the group identifier and the time frequency resource which are configured in advance by the base station;
a judging unit, configured to judge whether a group identifier corresponding to the judging unit is consistent with a group identifier scrambling the uplink scheduling grant;
a second determining unit, configured to determine, when a group identifier corresponding to the second determining unit is consistent with a group identifier obtained by scrambling the uplink scheduling grant, a bit corresponding to the second determining unit in the bit map according to the DMRS used for scheduling-free uplink transmission and a mapping relationship between the bit map and the DMRS pre-configured by the base station;
and the first processing unit is used for selecting to resend or discard the uplink scheduling grant based on scheduling according to the time-frequency domain information in the uplink scheduling grant according to the value of the bit corresponding to the first processing unit in the bit map.
16. The apparatus of claim 15, wherein the first processing unit comprises:
the first processing module is used for carrying out scheduling-based resending according to the time-frequency domain information in the uplink scheduling grant when the value of the bit corresponding to the first processing module in the bit map is 1;
and the second processing module is used for discarding the uplink scheduling grant when the value of the corresponding bit in the bit map is 0.
17. The apparatus of claim 15, further comprising:
and the second processing unit is used for discarding the uplink scheduling grant when the group identifier corresponding to the second processing unit is inconsistent with the group identifier scrambling the uplink scheduling grant.
18. The apparatus according to claim 16 or 17, wherein the second processing module or the second processing unit is configured to stop the schedule-free uplink transmission or continue the schedule-free uplink transmission.
19. A base station, characterized in that it comprises means for implementing a scheduling based retransmission according to any of claims 10 to 14.
20. A user equipment, characterized in that the user equipment comprises means for implementing a scheduling based retransmission according to any of claims 15 to 18.
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| CN106788943A (en) * | 2017-02-16 | 2017-05-31 | 宇龙计算机通信科技(深圳)有限公司 | Exempt from resource allocation method, user equipment and the base station of uplink scheduling license |
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| CN105636223A (en) * | 2014-11-06 | 2016-06-01 | 电信科学技术研究院 | Uplink scheduling method, device and system |
| CN106788943A (en) * | 2017-02-16 | 2017-05-31 | 宇龙计算机通信科技(深圳)有限公司 | Exempt from resource allocation method, user equipment and the base station of uplink scheduling license |
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