CN106533634B - method, base station and user equipment for dynamic HARQ load in carrier aggregation - Google Patents
method, base station and user equipment for dynamic HARQ load in carrier aggregation Download PDFInfo
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- CN106533634B CN106533634B CN201510574922.8A CN201510574922A CN106533634B CN 106533634 B CN106533634 B CN 106533634B CN 201510574922 A CN201510574922 A CN 201510574922A CN 106533634 B CN106533634 B CN 106533634B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1896—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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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
- H04L5/0001—Arrangements for dividing the transmission path
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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Abstract
The invention discloses a method for dynamic HARQ loads in carrier aggregation, a base station and user equipment, wherein the method comprises the steps that the base station sends indication information to UE through a downlink control channel PDCCH, the indication information comprises scheduling condition information of each service cell carrier, so that the UE feeds back ACK/NACK information to the base station according to the indication information, the base station sends the scheduling condition information indicating each service cell carrier to the UE, the UE determines the scheduling condition of each configured carrier according to the scheduling condition information, and feeds back the ACK/NACK information to the base station for the scheduled carrier, and the reliability of the useful information carried by the PUCCH/PUSCH channel is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method, a base station and user equipment for dynamic HARQ (hybrid automatic repeat request) load in carrier aggregation.
Background
In LTE Rel-10, carrier aggregation of up to 5 carriers, each of which is a backward compatible carrier, is introduced to support a maximum 100M bandwidth, as shown in fig. 1.
For FDD, Ack/Nack of maximum 32 carriers needs to be fed back at subframes, for TDD, the situation is more serious, a TDD system has different uplink and downlink ratios, and only uplink subframes can feed back control information such as Ack/Nack of a downlink PDSCH, for different uplink and downlink ratios, uplink subframes may need to feed back Ack/Nack of multiple downlink subframes, and the relationship is represented by table 1:
table 1 correspondence between Ack/Nack feedback downlink and uplink
It can be seen from the table that for configuration 2 and configuration 4, some uplink subframes need to feed back Ack/Nack of 4 downlink subframes, and for configuration 5 uplink subframes, Ack/Nack of 9 downlink subframes needs to be fed back.
Therefore, for Rel-13 carrier aggregation, higher requirements are put on the Ack/Nack feedback capacity of the downlink PDSCH.
For a carrier aggregation scenario, the Ack/Nack load number of the downlink PDSCH is determined according to the configured carrier number, and even if a certain carrier is not scheduled at a certain time point , the Ack/Nack of the carrier still needs to be fed back, at this time, the UE still needs to regard useless Ack/Nack information corresponding to the carrier as effective information to feed back through the PUCCH/PUSCH.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides methods for dynamic HARQ loads in carrier aggregation, a base station and user equipment, and improves the reliability of the PUCCH/PUSCH channel for bearing useful information.
, the invention provides a method for dynamic HARQ load in carrier aggregation, which comprises:
and the base station sends indication information to the UE through a downlink control channel (PDCCH), wherein the indication information comprises scheduling condition information of each service cell carrier, so that the UE feeds back ACK/NACK information to the base station according to the indication information.
Optionally, before the base station sends the indication information to the UE, the method further includes:
the base station configures an index value for the serving cell and sorts the index values of the serving cell;
correspondingly, the sending, by the base station, the indication information to the UE through the downlink control channel PDCCH includes:
and the base station sends scheduling condition information of the serving cell carriers corresponding to the sequence of the index values of the serving cells to the UE through the PDCCH.
Optionally, the indication information is in a bitmap format.
In a second aspect, the present invention further provides a method for dynamic HARQ payload in carrier aggregation, including:
user Equipment (UE) receives indication information sent by a base station through a downlink control channel (PDCCH), wherein the indication information comprises scheduling condition information of each serving cell carrier;
and the UE feeds back ACK/NACK information to the base station according to the indication information.
Optionally, the indication information is scheduling condition information of serving cell carriers corresponding to an order of index values of serving cells of the UE;
the sequence of the index values of the serving cell is from large to small or from small to large.
Optionally, after the UE receives the indication information, the method further includes:
the UE acquires scheduling condition information of a serving cell carrier corresponding to an index value of a serving cell of the UE from the indication information;
and the UE feeds back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier and the scheduling carrier indicated in the scheduling condition information.
In a third aspect, the present invention further provides kinds of base stations, including:
a sending module, configured to send, to the UE, indication information through a downlink control channel PDCCH, where the indication information includes scheduling information of each serving cell carrier.
Optionally, the base station further includes:
a sorting module, configured to configure an index value for the serving cell, and sort the index value of the serving cell;
the sending module is configured to send scheduling information of serving cell carriers corresponding to the order of the index values of the serving cells to the UE through the PDCCH.
In a fourth aspect, the present invention further provides kinds of user equipment, including:
a receiving module, configured to receive indication information sent by a base station through a downlink control channel PDCCH, where the indication information includes scheduling information of each serving cell carrier;
and the feedback module is used for feeding back the ACK/NACK information to the base station by the user according to the indication information.
Optionally, the feedback module is configured to feed back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier and the carrier indicated as scheduled in the scheduling condition information.
According to the technical scheme, the methods for dynamic HARQ loads in carrier aggregation, the base station and the user equipment provided by the invention have the advantages that the base station sends scheduling information indicating each serving cell carrier to the UE, the UE determines the scheduling condition of the cell according to the scheduling information, and feeds back ACK/NACK information to the base station in the scheduled cell, so that the reliability of the PUCCH/PUSCH channel for bearing useful information is improved.
Drawings
FIG. 1 is a diagram of LTE TDD and FDD Rel-10 carrier aggregation in the prior art;
fig. 2 is a flowchart illustrating a method for dynamic HARQ payload in carrier aggregation according to an embodiment of of the present invention;
fig. 3 is a flowchart illustrating a method for dynamic HARQ payload in carrier aggregations according to another embodiment of the present invention;
fig. 4 is a diagram illustrating a scheduled carrier according to an embodiment of the present invention.
Detailed Description
The following specific embodiments are described in detail with reference to the accompanying drawings, and the following examples are only for better clarity of the technical solution of the present invention, and should not be construed as limiting the scope of the present invention.
Fig. 2 is a flowchart illustrating a method for dynamic HARQ payload in carrier aggregation according to an embodiment of of the present invention, where as shown in fig. 2, the method includes the following steps:
201. and the base station sends indication information to the UE through a downlink control channel (PDCCH), wherein the indication information comprises scheduling condition information of each service cell carrier, so that the UE feeds back ACK/NACK information to the base station according to the indication information.
Before the base station sends the indication information to the UE in step 201 above, the method further includes:
200. the base station configures an index value for the serving cell and sorts the index values of the serving cell;
correspondingly, in step 201, the sending, by the base station, the indication information to the UE through the downlink control channel PDCCH includes:
and the base station sends scheduling condition information of the serving cell carriers corresponding to the sequence of the index values of the serving cells to the UE through the PDCCH.
The above method is described in detail below by way of specific examples.
scheduling condition indication DCIs are added to a main scheduling carrier PCell of the UE and used for indicating the scheduling condition of each carrier of a current subframe, and the UE knows which carrier has scheduling after decoding the DCIs and which carrier has no service transmission.
Taking fig. 4 as an example, scheduling carrier 1 is PCell, 3 secondary carriers are scheduled, the serving cell index value of scheduling carrier 1 is 0, and the serving cell index values of the scheduled three carriers are 1,3, and 5, respectively. The serving cell index value of the scheduled carrier 2 is 10, and the serving cell index values of the scheduled 2 secondary carriers are 15 and 18, respectively; scheduling carrier 3 performs self-scheduling only and has a serving cell index value of 20. And the base station indicates the scheduling condition of each cell by using the format of bitmap in the DCI according to the sequence of the index values of the service cell. In this example: the indication information is transmitted according to the order of the index values of the serving cell from small to large, wherein 1 represents that the carrier has scheduling, 0 represents that the carrier has no scheduling, and no service is transmitted, as can be seen from fig. 4, the indication information can be 11010100001000010010100000000000, and the bit is processed and transmitted according to the LTE DCI manner, the UE knows the scheduling condition of each carrier after receiving the DCI, and ACK/NACK feedback can be performed according to the condition of the actually scheduled carrier when feeding back the PUCCH/PUSCH.
According to the method, pieces of scheduling condition indication information DCI are added on a main scheduling carrier PCell of the UE and are used for indicating the scheduling condition of a current subframe to each carrier, the UE knows which carrier has scheduling after decoding the DCI and which carrier has no service transmission, and determines the number of ACK/NACK loads fed back according to the number of PDSCHs actually scheduled, so that the reliability of the PUCCH/PUSCH channels for bearing useful information is improved.
Fig. 3 is a flowchart illustrating a method for dynamic HARQ payload in carrier aggregation according to an embodiment of the present invention, where as shown in fig. 3, the method includes:
301. user Equipment (UE) receives indication information sent by a base station through a downlink control channel (PDCCH), wherein the indication information comprises scheduling condition information of each serving cell carrier;
302. and the UE feeds back ACK/NACK information to the base station according to the indication information.
Specifically, the indication information in step 301 is scheduling information of serving cell carriers corresponding to an order of index values of serving cells of the UE;
the sequence of the index values of the serving cell is from large to small or from small to large.
Specifically, the step 302 includes: after the UE receives the indication information, the UE acquires scheduling condition information of a serving cell carrier corresponding to an index value of a serving cell of the UE from the indication information;
and the UE feeds back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier and when the scheduling condition information indicates a scheduled carrier.
It can be understood that, when the above method is adopted, it is equivalent to that the base station and the user equipment have achieved default agreements, and the order of the index values of the serving cells in the indication information is fixed, from large to small or from small to large, so that when the UE receives the indication information, the UE finds the scheduling condition of the serving cell corresponding to the index value according to the index value of the serving cell, and feeds back ACK/NACK information to the base station according to the scheduled cell, i.e., the cell having service transmission.
The embodiment of the present invention further provides kinds of base stations, including:
a sending module, configured to send, to the UE, indication information through a downlink control channel PDCCH, where the indication information includes scheduling information of each serving cell carrier.
In preferable embodiments of this embodiment, the base station further includes:
a sorting module, configured to configure an index value for the serving cell, and sort the index value of the serving cell;
the sending module is configured to send scheduling information of serving cell carriers corresponding to the order of the index values of the serving cells to the UE through the PDCCH.
The embodiment of the present invention further provides types of user equipment, including:
a receiving module, configured to receive indication information sent by a base station through a downlink control channel PDCCH, where the indication information includes scheduling information of each serving cell carrier;
and the feedback module is used for feeding back the ACK/NACK information to the base station by the user according to the indication information.
In preferable embodiments of this embodiment, the feedback module is configured to feed back ACK/NACK information to the base station according to the scheduling information of the serving cell carrier when the scheduling information indicates a scheduled carrier.
The base station corresponds to the method in fig. 2, and the embodiment does not describe details of the base station, the user equipment UE corresponds to the method in fig. 3, and the embodiment does not describe details of the user equipment.
However, it is understood that embodiments of the invention may be practiced without these specific details, and that examples well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1, method for dynamic HARQ load in carrier aggregation, comprising:
a base station sends indication information to User Equipment (UE) through a downlink control channel (PDCCH), wherein the indication information comprises scheduling condition information of each serving cell carrier, so that the UE feeds back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier when the scheduling condition information of the serving cell carrier indicates a scheduled carrier;
before the base station sends the indication information to the UE, the method further includes:
the base station configures an index value for the serving cell and sorts the index values of the serving cell;
correspondingly, the sending, by the base station, the indication information to the UE through the downlink control channel PDCCH includes:
and the base station sends scheduling condition information of the serving cell carriers corresponding to the sequence of the index values of the serving cells to the UE through the PDCCH.
2. The method according to claim 1, wherein the indication information is in the format of a bitmap.
The method for dynamic HARQ load in kinds of carrier aggregation is characterized by comprising the following steps:
user Equipment (UE) receives indication information sent by a base station through a downlink control channel (PDCCH), wherein the indication information comprises scheduling condition information of each serving cell carrier;
the UE feeds back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier and when the scheduling condition information of the serving cell carrier indicates a scheduled carrier;
the indication information is scheduling condition information of serving cell carriers corresponding to the sequence of the index values of the serving cell of the UE;
the sequence of the index values of the serving cell is from large to small or from small to large.
4. The method of claim 3, wherein after the UE receives the indication information, the method further comprises:
and the UE acquires the scheduling condition information of the serving cell carrier corresponding to the index value of the serving cell of the UE in the indication information.
The base station of claim , comprising:
a sending module, configured to send indication information to user equipment UE through a downlink control channel PDCCH, where the indication information includes scheduling information of each serving cell carrier; enabling the UE to feed back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier when the scheduling condition information of the serving cell carrier indicates a scheduled carrier;
the base station further comprises:
a sorting module, configured to configure an index value for the serving cell, and sort the index value of the serving cell;
the sending module is configured to send scheduling information of serving cell carriers corresponding to the order of the index values of the serving cells to the UE through the PDCCH.
The user equipment of claim , comprising:
a receiving module, configured to receive indication information sent by a base station through a downlink control channel PDCCH, where the indication information includes scheduling information of each serving cell carrier;
a feedback module, configured to feed back ACK/NACK information to the base station according to the scheduling condition information of the serving cell carrier and when the scheduling condition information of the serving cell carrier indicates a scheduled carrier;
the indication information is scheduling condition information of serving cell carriers corresponding to the sequence of the index values of the serving cells of the user equipment.
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| CN106533634B true CN106533634B (en) | 2020-01-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469610A (en) * | 2010-11-16 | 2012-05-23 | 华为技术有限公司 | Method and device for feeding back and receiving response message in carrier aggregation |
| CN103856301A (en) * | 2014-02-21 | 2014-06-11 | 重庆邮电大学 | Implementation method for information feedback of UE end downlink HARQ in TD-LTE-A system |
| CN104065467A (en) * | 2010-05-03 | 2014-09-24 | 英特尔公司 | Configuring Component Carriers In Carrier Aggregation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065467A (en) * | 2010-05-03 | 2014-09-24 | 英特尔公司 | Configuring Component Carriers In Carrier Aggregation |
| CN102469610A (en) * | 2010-11-16 | 2012-05-23 | 华为技术有限公司 | Method and device for feeding back and receiving response message in carrier aggregation |
| CN103856301A (en) * | 2014-02-21 | 2014-06-11 | 重庆邮电大学 | Implementation method for information feedback of UE end downlink HARQ in TD-LTE-A system |
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