CN106549736A - A kind of cross-carrier rlc layer data repeating method and device - Google Patents
A kind of cross-carrier rlc layer data repeating method and device Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of cross-carrier rlc layer data repeating method and device, the method includes：Receive medium access control MAC entity and detect the RLC retransmits sent during the target mandate cell with available resources；According to RLC retransmits, by the rlc layer data is activation of unauthorized cell transmission failure to MAC entity so that the available resources of the rlc layer data separate target mandate cell of unauthorized cell transmission failure are retransmitted.The present invention is of poor quality in unauthorized band transmissions, during the rlc layer data of re-transmission in need, the target mandate cell with available resources detected using MAC entity, the rlc layer data of unauthorized cell transmission failure are retransmitted, transmission quality reliability due to authorizing cell, so can ensure that the transmitting of rlc layer data.
Description
Technical Field
The invention relates to the field of wireless and LTE communication, in particular to a cross-carrier RLC layer data retransmission method and device.
Background
Licensed-Assisted Access (LAA) relies on a carrier aggregation technology to ensure a higher data rate by aggregating an unlicensed frequency band to an LTE Licensed frequency band. However, LAA channel interference is severe because LAA employs the same unlicensed band as WiFi and different operators can share the band. Although LAA technology can bring a large channel bandwidth to mobile communication, strong interference seriously affects the LAA system performance.
In the LTE system, reliable reception of data is ensured by two data retransmission methods: one is a Hybrid Automatic Repeat reQuest (HARQ) retransmission process of a Media Access Control (MAC) layer, and the other is a Radio Link Control (RLC) layer retransmission process. HARQ retransmission techniques mitigate the negative impact of channel and interference jitter on data transmission by retransmitting multiple versions of the same transport block. However, applying HARQ retransmission to the LAA system is likely to fail its performance in the LTE system because the LAA system operates on an unlicensed frequency band with more complex interference. HARQ retransmission failure in LAA systems is likely to mean that the currently unlicensed channel cannot guarantee highly reliable reception of data, especially for error-sensitive services such as Web browsing and file downloading.
Therefore, a cross-carrier HARQ retransmission scheme is proposed in the standardized discussion process, and the cross-carrier HARQ retransmission scheme performs retransmission by using other carrier resources (authorized carriers or unauthorized carriers), which has the disadvantage that the retransmission resources must be enough, and if the available resources of the target carrier cannot carry all the data of the retransmitted MAC PDU, cross-carrier HARQ retransmission cannot be realized.
Disclosure of Invention
The invention provides a method and a device for retransmitting data of a cross-carrier RLC layer, which solve the problem that in the prior art, when the transmission quality of an unauthorized frequency band is poor, the HARQ retransmission needs more carrier resources.
According to one aspect of the present invention, a cross-carrier RLC layer data retransmission method is provided, which is applied to a radio link control RLC entity, and the method includes:
receiving RLC retransmission instructions sent by a Medium Access Control (MAC) entity when the MAC entity detects a target authorized cell with available resources;
and sending the RLC layer data which fails to be transmitted by the unauthorized cell to the MAC entity according to the RLC retransmission instruction, so that the RLC layer data which fails to be transmitted by the unauthorized cell is retransmitted by using available resources of the target authorized cell.
Before receiving an RLC retransmission instruction sent by a medium access control MAC entity when a target authorized cell with available resources is detected, the method further includes: :
when receiving RLC status protocol data unit PDU, preparing to perform RLC retransmission; or,
and when receiving a hybrid automatic repeat request HARQ data retransmission failure indication sent by the MAC entity and the sequence number of the RLC protocol data unit needing to be retransmitted, preparing to perform RLC retransmission.
The receiving of the HARQ data retransmission failure indication sent by the MAC entity specifically includes:
receiving HARQ data retransmission failure indication sent by an MAC entity when the HARQ data retransmission times reach the maximum retransmission times; or,
and receiving a HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission time exceeds the maximum retransmission time delay.
The receiving of the RLC protocol data unit sequence number to be retransmitted sent by the MAC entity specifically includes:
receiving the RLC protocol data unit sequence number identified and delivered by the MAC entity; or,
and receiving RLC protocol data unit data delivered by the MAC entity, and identifying a corresponding RLC protocol data unit sequence number according to the RLC protocol data unit data.
Sending RLC layer data failed to be transmitted in an unauthorized cell to an MAC entity, specifically including:
according to the size of the MAC protocol data unit indicated by the MAC entity, the RLC layer data which are failed to be transmitted in the unauthorized cell are segmented;
repackaging the segmented RLC layer data failed in transmission of the unauthorized cell;
and delivering the encapsulated RLC layer data which fails to be transmitted in the unauthorized cell to the MAC entity.
According to still another aspect of the present invention, there is also provided a cross-carrier RLC layer data retransmission method applied to a medium access control MAC entity, the method including:
when a target authorized cell with available resources is detected, sending an RLC retransmission instruction to an RLC entity which prepares for RLC retransmission;
receiving RLC layer data which are sent by an RLC entity according to an RLC retransmission instruction and fail to be transmitted in an unauthorized cell;
and retransmitting the RLC layer data which is failed to be transmitted by the unauthorized cell by utilizing the available resources of the target authorized cell.
Before the RLC retransmission instruction sent to the RLC entity that is ready for RLC retransmission, the method further includes:
when detecting that the HARQ data retransmission of the hybrid automatic repeat request fails, sending an HARQ data retransmission failure indication and the sequence number of the RLC protocol data unit needing to be retransmitted to the RLC entity.
The method for detecting the HARQ data retransmission failure specifically includes:
when detecting that the retransmission times of the HARQ data reach the maximum retransmission times, the retransmission of the HARQ data fails; or,
and when the HARQ data retransmission time is detected to exceed the maximum retransmission delay, the HARQ data retransmission is failed.
Wherein, sending the RLC protocol data unit sequence number needing retransmission to the RLC entity includes:
identifying the corresponding RLC protocol data unit serial number according to the retransmitted RLC layer data, and sending the RLC protocol data unit serial number to an RLC entity; or,
and the RLC protocol data unit data is sent to the RLC entity, wherein the corresponding RLC protocol data unit sequence number can be identified according to the RLC protocol data unit data.
The method for detecting the target authorized cell with the available resources comprises the following steps:
when detecting that the authorized cell has available resources, determining the authorized cell in which the first available resource is located as a target authorized cell; or
Searching a first authorized cell corresponding to an unauthorized cell needing to retransmit RLC layer data according to a preset mapping relation between the unauthorized cell and the authorized cell;
and when detecting that the first authorized cell has available resources, determining the first authorized cell as a target authorized cell.
According to still another aspect of the present invention, there is also provided a cross-carrier RLC layer data retransmission apparatus applied to a radio link control RLC entity, the apparatus including:
a first receiving module, configured to receive an RLC retransmission instruction sent by a medium access control MAC entity when detecting a target authorized cell with available resources;
and the first sending module is used for sending the RLC layer data which fails to be transmitted by the unauthorized cell to the MAC entity according to the RLC retransmission instruction, so that the RLC layer data which fails to be transmitted by the unauthorized cell is retransmitted by using available resources of the target authorized cell.
Wherein, the cross-carrier RLC layer data retransmission device also comprises:
the first processing module is used for preparing RLC retransmission when an RLC status protocol data unit PDU is received; or,
and the second processing module is used for preparing RLC retransmission when receiving a hybrid automatic repeat request HARQ data retransmission failure indication sent by the MAC entity and the sequence number of the RLC protocol data unit needing to be retransmitted.
Wherein, the second processing module specifically includes:
a first receiving unit, configured to receive an HARQ data retransmission failure indication sent by an MAC entity when the number of HARQ data retransmissions reaches a maximum number of retransmissions; or,
and the second receiving unit is used for receiving the HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission time exceeds the maximum retransmission time delay.
Wherein, the second processing module specifically includes:
a third receiving unit, configured to receive the RLC protocol data unit sequence number identified and delivered by the MAC entity; or,
and the fourth receiving unit is used for receiving the RLC protocol data unit data delivered by the MAC entity and identifying the corresponding RLC protocol data unit serial number according to the RLC protocol data unit data.
Wherein the first transmitting module comprises:
a segmentation unit, configured to segment RLC layer data that fails in transmission in the unlicensed cell according to the size of the MAC protocol data unit indicated by the MAC entity;
the encapsulation unit is used for encapsulating the segmented RLC layer data which fails to be transmitted in the unauthorized cell again;
and the first sending unit is used for delivering the encapsulated RLC layer data which fails to be transmitted in the unauthorized cell to the MAC entity.
According to still another aspect of the present invention, there is also provided a cross-carrier RLC layer data retransmission apparatus applied to a medium access control MAC entity, the apparatus including:
a second sending module, configured to send an RLC retransmission instruction to an RLC entity that prepares for RLC retransmission when a target authorized cell with available resources is detected;
the second receiving module is used for receiving RLC layer data which are sent by the RLC entity according to the RLC retransmission indication and fail in transmission of the unauthorized cell;
and the retransmission module is used for retransmitting the RLC layer data which fails to be transmitted in the unauthorized cell by utilizing the available resources of the target authorized cell.
Wherein, the cross-carrier RLC layer data retransmission device also comprises:
and the third sending module is used for sending a HARQ data retransmission failure indication and the sequence number of the RLC protocol data unit needing to be retransmitted to the RLC entity when detecting that the HARQ data retransmission of the hybrid automatic repeat request fails.
Wherein, the third sending module includes:
the first sending unit is used for identifying the corresponding RLC protocol data unit serial number according to the retransmitted RLC layer data and sending the RLC protocol data unit serial number to the RLC entity; or,
and the second sending unit is used for sending the RLC protocol data unit data to the RLC entity, wherein the corresponding RLC protocol data unit sequence number can be identified according to the RLC protocol data unit data.
Wherein, the cross-carrier RLC layer data retransmission device also comprises:
the first confirmation module is used for determining the authorized cell in which the first available resource is located as a target authorized cell when detecting that the authorized cell has available resources; or
The searching module is used for searching a first authorized cell corresponding to the unauthorized cell needing to retransmit the RLC layer data according to the preset mapping relation between the unauthorized cell and the authorized cell;
and the second confirmation module is used for determining the first authorized cell as the target authorized cell when detecting that the first authorized cell has available resources.
The embodiment of the invention has the beneficial effects that:
when the transmission quality of the unauthorized frequency band is poor and RLC layer data needing to be retransmitted exists, the target authorized cell with available resources detected by the MAC entity is utilized to retransmit the RLC layer data failed to be transmitted in the unauthorized cell.
Drawings
FIG. 1 is a schematic flow chart of a cross-carrier RLC layer data retransmission method of an RLC entity side according to the present invention;
FIG. 2 is a flow chart of a method for retransmitting data in a cross-carrier RLC layer at an MAC entity end according to the present invention;
FIG. 3 is a diagram illustrating dynamically selected retransmission resources according to the present invention;
FIG. 4 is a diagram illustrating RLC layer data segmentation in accordance with the present invention;
FIG. 5 is a diagram illustrating statically selected retransmission resources according to the present invention;
FIG. 6 is a flowchart illustrating a cross-carrier RLC layer data retransmission method according to the present invention;
FIG. 7 is a schematic flow chart of an RLC entity side cross-carrier RLC layer data retransmission apparatus according to the present invention;
fig. 8 is a flowchart illustrating a MAC entity side cross-carrier RLC layer data retransmission apparatus according to the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to solve the problems of poor transmission quality of an unauthorized frequency band and more carrier resources required by HARQ retransmission in the prior art, an embodiment of the present invention provides a cross-carrier RLC layer data retransmission method, which is introduced from a radio link control RLC entity side and a medium access control MAC entity side.
RLC entity side
As shown in fig. 1, the cross-carrier RLC layer data retransmission method specifically includes the following steps:
step S11: and receiving an RLC retransmission indication sent when the medium access control MAC entity detects a target authorized cell with available resources.
When the RLC entity enters a state of RLC retransmission preparation, the MAC entity is indicated to detect whether a target authorized cell with available resources exists; when the MAC entity detects a target authorized cell with available resources, an RLC retransmission indication sent from the MAC entity is received.
Step S12: and sending the RLC layer data which fails to be transmitted by the unauthorized cell to the MAC entity according to the RLC retransmission instruction, so that the RLC layer data which fails to be transmitted by the unauthorized cell is retransmitted by using available resources of the target authorized cell.
And after receiving an RLC retransmission instruction sent by the MAC entity, sending RLC layer data (RLC PDU) failed to be transmitted by the unauthorized cell to the MAC entity terminal, so that the RLC layer data failed to be transmitted by the unauthorized cell is retransmitted by the MAC entity by using available resources of the target authorized cell.
It should be noted that the RLC entity and the MAC entity described in this embodiment may be applied to the ue side or the bs side. When the cell is the user terminal side, it indicates that the uplink data transmission of the unauthorized cell fails, and when the RLC layer data retransmission is performed, it needs to detect whether there is an authorized target cell with uplink available resources; when the cell is the base station side, it is indicated that the downlink data transmission of the unauthorized cell fails, and when RLC retransmission is performed, it is required to detect whether an authorized target cell having available downlink resources exists.
Before step S11, the method further includes: preparing to perform RLC retransmission according to the received RLC retransmission request; the specific implementation can refer to the following two ways:
the first method is as follows: the method specifically comprises the following steps: when receiving the RLC status protocol data unit PDU, it is ready for RLC retransmission.
The RLC status protocol data unit PDU is sent by a peer RLC entity, and the peer RLC entity refers to a receiving RLC entity corresponding to the sending RLC entity.
The second method comprises the following steps: the method specifically comprises the following steps: and when receiving a hybrid automatic repeat request HARQ data retransmission failure indication sent by the MAC entity and the sequence number of the RLC protocol data unit needing to be retransmitted, preparing to perform RLC retransmission.
Here, when the retransmission request is an HARQ retransmission failure indication triggered by the MAC entity, the RLC layer further needs to know the sequence number of the RLC protocol data unit that needs to be retransmitted from the MAC entity.
Specifically, receiving an HARQ data retransmission failure indication sent by the MAC entity specifically includes:
and receiving HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission times reach the maximum retransmission times.
Presetting a HARQ maximum retransmission time, when the HARQ data retransmission time reaches the maximum retransmission time, indicating that the HARQ retransmission is failed.
Or receiving a HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission time exceeds the maximum retransmission delay.
The sending end MAC entity and the receiving end MAC entity maintain a HARQ retransmission timer with the same length for each HARQ process. And within the validity period of the HARQ retransmission timer, the HARQ retransmission times are not limited. Once the HARQ retransmission timer expires, it means that the HARQ retransmission failed. Because the lengths of the HARQ retransmission timers maintained by the MAC entity of the sending end and the MAC entity of the receiving end are the same, the sending end and the receiving end can simultaneously know the HARQ retransmission failure. The length of the HARQ retransmission timer may be issued through RRC signaling, or may be set through a field of the MAC-MainConfig (e.g., a new field similar to maxHARQ-Tx).
Specifically, the sequence number of the RLC protocol data unit needing to be retransmitted is known from the MAC entity
Receiving the RLC protocol data unit sequence number identified and delivered by the MAC entity; this step can be implemented by the MAC layer demultiplexing function: the RLC protocol data unit sequence number may be identified by the MAC layer and delivered to the RLC layer.
Or, the method is realized by a MAC layer demultiplexing function, receives RLC protocol data unit data delivered by the MAC entity, and identifies a corresponding RLC protocol data unit sequence number according to the RLC protocol data unit data.
Wherein, because the RLC layer has a segmentation function, when the retransmission data is larger than the retransmission resource, the retransmission data can be segmented and retransmitted, and the method specifically includes:
and according to the size of the MAC protocol data unit indicated by the MAC entity, segmenting RLC layer data failed to be transmitted in the unauthorized cell so as to match the size of the MAC protocol data unit indicated by the MAC layer.
And re-encapsulating the segmented RLC layer data failed to be transmitted in the unauthorized cell, wherein the step of re-encapsulating refers to adding RLC heads to the segmented RLC layer data respectively and encapsulating the RLC heads into new RLC layer data.
And delivering the RLC layer data which is subjected to the transmission failure in the packaged unauthorized cell to an MAC entity, matching the new RLC layer data with the size of an MAC protocol data unit, and retransmitting the RLC layer data through available transmission resources.
The cross-carrier RLC layer data retransmission method is introduced from the RLC entity side, and the cross-carrier RLC layer data retransmission method will be further described from the MAC entity side.
MAC entity side
As shown in fig. 2, the cross-carrier RLC layer data retransmission method specifically includes the following steps:
step S21: an RLC retransmission indication is sent to an RLC entity that is ready for RLC retransmission when a target authorized cell with available resources is detected.
When the data transmission of the RLC layer of the unauthorized cell fails, the RLC entity receives an RLC retransmission request and then prepares for RLC retransmission, and at the moment, the MAC entity detects whether a target authorized cell with available resources exists currently; when a target authorized cell with available resources is detected, the MAC entity sends an RLC retransmission indication to the RLC entity that is ready for RLC retransmission.
Step S22: and receiving RLC layer data which is sent by the RLC entity according to the RLC retransmission indication and fails to be transmitted by the unauthorized cell.
And after receiving the RLC retransmission instruction sent by the MAC entity, the RLC entity sends RLC layer data failed to be transmitted by the unauthorized cell to the MAC entity.
Step S23: and retransmitting the RLC layer data which is failed to be transmitted by the unauthorized cell by utilizing the available resources of the target authorized cell.
After receiving the RLC layer data which are transmitted by the RLC entity and fail to be transmitted by the unauthorized cell, the MAC entity retransmits the RLC layer data which fail to be transmitted by the unauthorized cell by using the detected available resources of the target authorized cell.
Before the RLC retransmission instruction sent to the RLC entity that is ready for RLC retransmission, the method further includes:
when the data transmission of the RLC layer of the unauthorized cell fails, namely when the HARQ data retransmission of the hybrid automatic repeat request is detected to fail, an HARQ data retransmission failure indication and the sequence number of the RLC protocol data unit needing to be retransmitted are sent to the RLC entity.
The method for detecting the HARQ data retransmission failure specifically includes:
and when detecting that the retransmission times of the HARQ data reach the maximum retransmission times, the retransmission of the HARQ data fails.
Or, when detecting that the HARQ data retransmission time exceeds the maximum retransmission delay time, the HARQ data retransmission fails.
Wherein, sending the RLC protocol data unit sequence number needing retransmission to the RLC entity includes:
and identifying the corresponding RLC protocol data unit sequence number according to the retransmitted RLC layer data, and sending the RLC protocol data unit sequence number to the RLC entity.
Or, the RLC protocol data unit data is sent to the RLC entity, wherein the corresponding RLC protocol data unit sequence number can be identified according to the RLC protocol data unit data.
The method for detecting the target authorized cell with the available resource includes a static configuration mode and a dynamic configuration mode, that is, a mode for configuring the retransmission resource.
The dynamic configuration mode specifically comprises the following steps: and when detecting that the authorized cells have available resources, determining the authorized cell in which the first available resource is positioned as a target authorized cell.
Here, as long as the available resources do not belong to an unlicensed cell, they can be configured as retransmission resources. This step is understood to mean that RLC protocol data units in the RLC retransmission buffer can only be sent over the granted resources. The cross-carrier RLC retransmission can occur on any available authorized cell resource, when the MAC layer identifies an authorized cell with available resources, the authorized cell where the first available resource is located is selected as a target authorized cell, and RLC layer data is instructed to utilize the target authorized cell to perform RLC layer data retransmission.
Taking the sending end as the user terminal as an example, that is, the case of data transmission failure of the uplink RLC layer, as shown in fig. 3, the base station configures 4 carrier aggregation cases for the user terminal, that is, one primary cell, two authorized secondary cells (authorized cell 1 and authorized cell 2), and one unauthorized secondary cell. In the frame structure of the auxiliary cell, subframe 0, subframe 4, subframe 5 and subframe 9 are downlink subframes, subframe 1 and subframe 6 are special subframes, and subframe 2, subframe 3, subframe 7 and subframe 8 are uplink subframes. On the subframe 4 of the unauthorized cell, the user terminal RLC entity receives HARQ retransmission failure indication and the sequence number of the RLC protocol data unit that needs to be retransmitted from the lower MAC entity, which indicates that cross-carrier RLC retransmission needs to be performed. The MAC entity detects that the subframe 8 of the current frame of the authorized cell 1 and the subframe 2 of the next frame are available resources, and the subframe 7 and the subframe 8 of the current frame of the authorized cell 2 are available resources. Subframe 7 on cell 2 is granted as the first available uplink transmission resource and is therefore selected as the RLC retransmission resource for cross-carrier RLC retransmissions.
Due to the problem that the retransmission data of the RLC layer is larger than the retransmission resource size, the data of the RLC layer needs to be segmented. Assuming that the available resource size on subframe 7 of authorized cell 2 cannot meet the requirement of retransmitting RLC layer data, the RLC entity performs a re-segmentation operation on the RLC layer data that needs to be retransmitted to match the size of a MAC protocol data unit (MAC PDU) indicated by the MAC layer, as shown in fig. 4. Since the 1 st available resource (subframe 7) on the licensed cell 2 cannot meet the transmission requirements of the retransmitted RLC layer data, the retransmitted RLC layer data needs to be re-segmented. The operation of segmentation of the retransmitted RLC layer data is consistent with the existing mechanism, that is, the RLC layer data part needing to be retransmitted is segmented and reassembled into the new RLC layer data, and then an RLC header is added to the new RLC layer data and encapsulated into the new RLC layer data (RLC PDU1 and RLC PDU 2). After being segmented and packaged again by the RLC layer, the data are multiplexed to the MAC layer and packaged into retransmission data MACPDU 1 and MAC PDU2 which are then transmitted by the physical layer, and retransmission of the RLC layer data is realized.
The dynamic configuration mode is introduced above, and the static configuration mode is further introduced below, specifically: and searching a first authorized cell corresponding to the unauthorized cell needing to retransmit the RLC layer data according to a preset mapping relation between the unauthorized cell and the authorized cell.
And when detecting that the first authorized cell has available resources, determining the first authorized cell as a target authorized cell.
The target authorized cell may be statically configured, i.e., when cross-carrier RLC retransmissions are triggered, the retransmission of RLC layer data is always completed on the target authorized cell corresponding to the unlicensed cell in which the transmission failed. That is, the mapping relationship between each authorized auxiliary cell and one or more authorized cells is configured on the base station side in advance, and when cross-carrier RLC retransmission needs to be performed on the authorized auxiliary cells, the cross-carrier RLC retransmission process can only occur on the authorized cells corresponding to the authorized auxiliary cells. And only when the MAC layer of the sending end identifies that available resources exist on the corresponding authorized cell, the RLC layer is instructed to multiplex the RLC layer data needing to be retransmitted onto the available resources of the target authorized cell for RLC retransmission.
Taking the sending end as the user terminal as an example, that is, the case of data transmission failure of the uplink RLC layer, as shown in fig. 5, the base station configures 4 carrier aggregation cases for the user terminal, that is, one primary cell, two authorized secondary cells (authorized cell 1 and authorized cell 2), and one unauthorized secondary cell. In the frame structure of the auxiliary cell, subframe 0, subframe 4, subframe 5 and subframe 9 are downlink subframes, subframe 1 and subframe 6 are special subframes, and subframe 2, subframe 3, subframe 7 and subframe 8 are uplink subframes. On the subframe 4 of the unauthorized cell, the user terminal RLC entity receives HARQ retransmission failure indication and the sequence number of the RLC protocol data unit that needs to be retransmitted from the lower MAC entity, which indicates that cross-carrier RLC retransmission needs to be performed. The MAC entity detects that the subframe 8 of the current frame of the authorized cell 1 and the subframe 2 of the next frame are available resources, and the subframe 7 and the subframe 8 of the current frame of the authorized cell 2 are available resources. Since the pre-configured retransmission cell of the unlicensed cell is the licensed cell 1, even if the subframe 7 on the licensed cell 2 is used as the first available uplink transmission resource, the MAC entity still selects the licensed cell 1 for the RLC retransmission resource.
It should be noted that the above two ways of determining retransmission resources are not only applicable to the case where the transmitting end is a user terminal, but also applicable to the case where the transmitting end is a base station. When the sending end is a base station, the MAC layer should detect whether there is an authorized cell with downlink transmission resources, and the specific implementation manner is similar to the above example, and therefore is not described again.
As shown in fig. 6, the cross-carrier RLC retransmission method specifically includes:
step 61, after receiving the RLC status PDU sent by the receiving end RLC, the sending end RLC enters a state of being prepared for retransmission;
step 62, when the sending end MAC detects that the authorized cell with the available resource exists, the sending end MAC sends an RLC retransmission instruction to the sending end RLC;
step 63, the sending end RLC sends the RLC layer data needing to be retransmitted to the sending end MAC;
and step 64, the sending end MAC uses the available resources of the selected target authorized cell to perform RLC layer data retransmission to the receiving end MAC.
In summary, when the transmission quality of the unlicensed frequency band is poor and there is RLC layer data to be retransmitted, the target licensed cell with available resources detected by the MAC entity is used to retransmit the RLC layer data failed in transmission in the unlicensed cell.
According to still another aspect of the embodiments of the present invention, there is also provided a cross-carrier RLC layer data retransmission apparatus applied to a radio link control RLC entity, as shown in fig. 7, the apparatus including:
a first receiving module 71, configured to receive an RLC retransmission indication sent when the MAC entity detects a target authorized cell with available resources;
the first sending module 72 is configured to send, according to the RLC retransmission instruction, the RLC layer data that failed to be transmitted by the unlicensed cell to the MAC entity, so that the RLC layer data that failed to be transmitted by the unlicensed cell is retransmitted by using available resources of the target licensed cell.
Wherein, the cross-carrier RLC layer data retransmission device also comprises:
the first processing module is used for preparing RLC retransmission when an RLC status protocol data unit PDU is received; or,
and the second processing module is used for preparing RLC retransmission when receiving a hybrid automatic repeat request HARQ data retransmission failure indication sent by the MAC entity and the sequence number of the RLC protocol data unit needing to be retransmitted.
Wherein, the second processing module specifically includes:
a first receiving unit, configured to receive an HARQ data retransmission failure indication sent by an MAC entity when the number of HARQ data retransmissions reaches a maximum number of retransmissions; or,
and the second receiving unit is used for receiving the HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission time exceeds the maximum retransmission time delay.
Wherein, the second processing module specifically includes:
a third receiving unit, configured to receive the RLC protocol data unit sequence number identified and delivered by the MAC entity; or,
and the fourth receiving unit is used for receiving the RLC protocol data unit data delivered by the MAC entity and identifying the corresponding RLC protocol data unit serial number according to the RLC protocol data unit data.
Wherein the first transmitting module comprises:
a segmentation unit, configured to segment RLC layer data that fails in transmission in the unlicensed cell according to the size of the MAC protocol data unit indicated by the MAC entity;
the encapsulation unit is used for encapsulating the segmented RLC layer data which fails to be transmitted in the unauthorized cell again;
and the first sending unit is used for delivering the encapsulated RLC layer data which fails to be transmitted in the unauthorized cell to the MAC entity.
According to still another aspect of the embodiments of the present invention, there is also provided a cross-carrier RLC layer data retransmission apparatus applied to a medium access control MAC entity, as shown in fig. 8, the apparatus including:
a second sending module 81, configured to send an RLC retransmission instruction to an RLC entity that prepares for RLC retransmission when a target authorized cell with available resources is detected;
a second receiving module 82, configured to receive RLC layer data of an unauthorized cell that is sent by the RLC entity according to the RLC retransmission indication and fails to be transmitted;
and a retransmission module 83, configured to retransmit the RLC layer data that has failed to be transmitted in the unlicensed cell by using the available resource of the target licensed cell.
Wherein, the cross-carrier RLC layer data retransmission device also comprises:
and the third sending module is used for sending a HARQ data retransmission failure indication and the sequence number of the RLC protocol data unit needing to be retransmitted to the RLC entity when detecting that the HARQ data retransmission of the hybrid automatic repeat request fails.
Wherein, the third sending module includes:
the first sending unit is used for identifying the corresponding RLC protocol data unit serial number according to the retransmitted RLC layer data and sending the RLC protocol data unit serial number to the RLC entity; or,
and the second sending unit is used for sending the RLC protocol data unit data to the RLC entity, wherein the corresponding RLC protocol data unit sequence number can be identified according to the RLC protocol data unit data.
Wherein, the cross-carrier RLC layer data retransmission device also comprises:
the first confirmation module is used for determining the authorized cell in which the first available resource is located as a target authorized cell when detecting that the authorized cell has available resources; or
The searching module is used for searching a first authorized cell corresponding to the unauthorized cell needing to retransmit the RLC layer data according to the preset mapping relation between the unauthorized cell and the authorized cell;
and the second confirmation module is used for determining the first authorized cell as the target authorized cell when detecting that the first authorized cell has available resources.
It should be noted that the apparatus is an apparatus corresponding to the cross-carrier RLC retransmission method, and all implementation manners in the method embodiments are applicable to the embodiment of the apparatus, and the same technical effect can be achieved.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (19)
1. A cross-carrier RLC layer data retransmission method is applied to a Radio Link Control (RLC) entity and is characterized by comprising the following steps:
receiving RLC retransmission instructions sent by a Medium Access Control (MAC) entity when the MAC entity detects a target authorized cell with available resources;
and sending the RLC layer data which fails to be transmitted by the unauthorized cell to the MAC entity according to the RLC retransmission instruction, so that the RLC layer data which fails to be transmitted by the unauthorized cell is retransmitted by using the available resources of the target authorized cell.
2. The cross-carrier RLC layer data retransmission method according to claim 1, further comprising, before receiving an RLC retransmission indication sent when the medium access control MAC entity detects a target authorized cell with available resources:
when receiving RLC status protocol data unit PDU, preparing to perform RLC retransmission; or,
and when receiving a hybrid automatic repeat request HARQ data retransmission failure indication sent by the MAC entity and the sequence number of the RLC protocol data unit needing to be retransmitted, preparing to perform RLC retransmission.
3. The cross-carrier RLC layer data retransmission method according to claim 2, wherein receiving the HARQ data retransmission failure indication sent by the MAC entity specifically includes:
receiving HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission times reach the maximum retransmission times; or,
and receiving HARQ data retransmission failure indication sent by the MAC entity when the HARQ data retransmission time exceeds the maximum retransmission time delay.
4. The cross-carrier RLC layer data retransmission method according to claim 3, wherein receiving the RLC protocol data unit sequence number to be retransmitted sent by the MAC entity specifically comprises:
receiving the RLC protocol data unit sequence number identified and delivered by the MAC entity; or,
and receiving RLC protocol data unit data delivered by the MAC entity, and identifying a corresponding RLC protocol data unit sequence number according to the RLC protocol data unit data.
5. The cross-carrier RLC layer data retransmission method according to claim 4, wherein sending RLC layer data in which transmission of an unauthorized cell fails to be sent to the MAC entity specifically comprises:
segmenting RLC layer data failed to be transmitted in the unauthorized cell according to the size of an MAC protocol data unit indicated by the MAC entity;
repackaging the segmented RLC layer data failed in transmission of the unauthorized cell;
and delivering the encapsulated RLC layer data which fails to be transmitted in the unauthorized cell to the MAC entity.
6. A cross-carrier RLC layer data retransmission method is applied to a media access control MAC entity and is characterized by comprising the following steps:
when a target authorized cell with available resources is detected, sending an RLC retransmission instruction to an RLC entity which prepares for RLC retransmission;
receiving RLC layer data which are sent by the RLC entity according to the RLC retransmission indication and fail to be transmitted in the unauthorized cell;
and retransmitting the RLC layer data which is failed to be transmitted by the unauthorized cell by utilizing the available resources of the target authorized cell.
7. The cross-carrier RLC layer data retransmission method according to claim 6, wherein before the RLC retransmission indication sent to the RLC entity that is ready for RLC retransmission, further comprising:
and when detecting that the HARQ data retransmission of the hybrid automatic repeat request fails, sending an HARQ data retransmission failure indication and the sequence number of the RLC protocol data unit needing to be retransmitted to the RLC entity.
8. The cross-carrier RLC layer data retransmission method according to claim 7, wherein detecting a HARQ data retransmission failure specifically comprises:
when detecting that the retransmission times of the HARQ data reach the maximum retransmission times, the retransmission of the HARQ data fails; or,
and when the HARQ data retransmission time is detected to exceed the maximum retransmission delay, the HARQ data retransmission is failed.
9. The cross-carrier RLC layer data retransmission method according to claim 8, wherein sending the RLC protocol data unit sequence number to be retransmitted to the RLC entity specifically comprises:
identifying a corresponding RLC protocol data unit serial number according to the retransmitted RLC layer data, and sending the RLC protocol data unit serial number to the RLC entity; or,
and the RLC protocol data unit data is sent to the RLC entity, wherein the corresponding RLC protocol data unit sequence number can be identified according to the RLC protocol data unit data.
10. The cross-carrier RLC layer data retransmission method according to claim 9, wherein detecting a target authorized cell having available resources comprises:
when detecting that the authorized cell has available resources, determining the authorized cell in which the first available resource is located as a target authorized cell; or
Searching a first authorized cell corresponding to an unauthorized cell needing to retransmit RLC layer data according to a preset mapping relation between the unauthorized cell and the authorized cell;
and when detecting that the first authorized cell has available resources, determining the first authorized cell as a target authorized cell.
11. A cross-carrier RLC layer data retransmission device is applied to a Radio Link Control (RLC) entity and is characterized by comprising the following steps:
a first receiving module, configured to receive an RLC retransmission instruction sent by a medium access control MAC entity when detecting a target authorized cell with available resources;
and the first sending module is used for sending the RLC layer data which fails to be transmitted by the unauthorized cell to the MAC entity according to the RLC retransmission instruction, so that the RLC layer data which fails to be transmitted by the unauthorized cell is retransmitted by using the available resources of the target authorized cell.
12. The cross-carrier RLC layer data retransmission apparatus according to claim 11, further comprising:
the first processing module is used for preparing RLC retransmission when an RLC status protocol data unit PDU is received; or,
and the second processing module is used for preparing RLC retransmission when receiving a hybrid automatic repeat request HARQ data retransmission failure indication sent by the MAC entity and the sequence number of the RLC protocol data unit needing to be retransmitted.
13. The cross-carrier RLC layer data retransmission apparatus according to claim 12, wherein the second processing module specifically comprises:
a first receiving unit, configured to receive an HARQ data retransmission failure indication sent by the MAC entity when the number of HARQ data retransmissions reaches a maximum number of retransmissions; or,
a second receiving unit, configured to receive an HARQ data retransmission failure indication sent by the MAC entity when HARQ data retransmission time exceeds a maximum retransmission delay.
14. The cross-carrier RLC layer data retransmission apparatus according to claim 13, wherein the second processing module specifically comprises:
a third receiving unit, configured to receive the RLC protocol data unit sequence number identified and delivered by the MAC entity; or,
and the fourth receiving unit is used for receiving the RLC protocol data unit data delivered by the MAC entity and identifying the corresponding RLC protocol data unit sequence number according to the RLC protocol data unit data.
15. The cross-carrier RLC layer data retransmission apparatus according to claim 14, wherein the first transmission module comprises:
a segmentation unit, configured to segment RLC layer data that fails to be transmitted in the unlicensed cell according to a size of an MAC protocol data unit indicated by the MAC entity;
the encapsulation unit is used for encapsulating the segmented RLC layer data which fails to be transmitted in the unauthorized cell again;
and the first sending unit is used for delivering the encapsulated RLC layer data which fails to be transmitted in the unauthorized cell to the MAC entity.
16. A cross-carrier RLC layer data retransmission device is applied to a medium access control MAC entity and is characterized by comprising the following components:
a second sending module, configured to send an RLC retransmission instruction to an RLC entity that prepares for RLC retransmission when a target authorized cell with available resources is detected;
a second receiving module, configured to receive RLC layer data of an unauthorized cell, which is sent by the RLC entity according to the RLC retransmission indication and fails in transmission;
and the retransmission module is used for retransmitting the RLC layer data which fails to be transmitted by the unauthorized cell by utilizing the available resources of the target authorized cell.
17. The cross-carrier RLC layer data retransmission apparatus according to claim 16, further comprising:
and the third sending module is used for sending an HARQ data retransmission failure indication and an RLC protocol data unit sequence number needing to be retransmitted to the RLC entity when detecting that the HARQ data retransmission of the hybrid automatic retransmission request fails.
18. The cross-carrier RLC layer data retransmission apparatus according to claim 17, wherein the third transmitting module comprises:
the first sending unit is used for identifying the corresponding RLC protocol data unit serial number according to the retransmitted RLC layer data and sending the RLC protocol data unit serial number to the RLC entity; or,
and the second sending unit is used for sending the RLC protocol data unit data to the RLC entity, wherein the corresponding RLC protocol data unit sequence number can be identified according to the RLC protocol data unit data.
19. The cross-carrier RLC layer data retransmission apparatus according to claim 18, further comprising:
the first confirmation module is used for determining the authorized cell in which the first available resource is located as a target authorized cell when detecting that the authorized cell has available resources; or
The searching module is used for searching a first authorized cell corresponding to the unauthorized cell needing to retransmit the RLC layer data according to the preset mapping relation between the unauthorized cell and the authorized cell;
a second confirmation module, configured to determine that the first authorized cell is a target authorized cell when detecting that there is an available resource in the first authorized cell.
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