CN101867467A - Method and device for feeding back hybrid automatic repeat request (HARQ) acknowledgement message in carrier aggregation system - Google Patents
Method and device for feeding back hybrid automatic repeat request (HARQ) acknowledgement message in carrier aggregation system Download PDFInfo
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Abstract
The invention discloses a method for feeding back a hybrid automatic repeat request (HARQ) acknowledgement message in a carrier aggregation system. The method specifically comprises the following steps of; determining an uplink sub-frame used for feeding back a schedule request (SR) and transmitting a plurality of HARQ acknowledgement message signals to be fed back on the determined uplink sub-frame by user equipment (UE). The invention also discloses a device for feeding back the HARQ acknowledgement message in the carrier aggregation system. The device comprises an SR sub-frame determining unit and a signal transmitting unit, wherein the SR sub-frame determining unit is used for determining the uplink sub-frame used for feeding back the SR; and the signal transmitting unit is used for transmitting the plurality of HARQ acknowledgement message signals to be fed back on the uplink sub-frame. According to the method and the device provided by the invention, the transmission of the plurality of the HARQ acknowledgement message signals to be fed back is realized on the uplink sub-frame in the carrier aggregation system and the performance of a long term evolution (LTE) carrier aggregation system is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for feeding back HARQ acknowledgement messages in a carrier aggregation system.
Background
In a Long Term Evolution mobile communication upgrade system, for example, a Long Term Evolution-Advanced (LTE-Advanced) system, a higher transmission rate needs to be provided through a larger transmission bandwidth to meet the user's requirement, but the expansion of the transmission bandwidth is limited by frequency resources owned by an operator. For the LTE multi-carrier system, in order to support a system bandwidth wider than LTE, two ways of obtaining the system bandwidth are mainly proposed, one way is to directly allocate a spectrum with a corresponding bandwidth to meet the requirement of the LTE multi-carrier system, such as a single-frequency spectrum diagram shown in fig. 1, for example, directly allocate a spectrum with a bandwidth of 100 MHz; another way is to obtain a spectrum with a large bandwidth by aggregating some frequency spectrums allocated to the existing system, in the aggregated spectrum diagram shown in fig. 2, N downlink carriers are aggregated to form a downlink spectrum, M uplink carriers are aggregated to form an uplink spectrum, at this time, uplink and downlink carriers in the system may be asymmetrically configured, and this carrier aggregation system mainly based on the spectrum aggregation mode is a main research direction of the current LTE multi-carrier system because it improves the utilization rate of the spectrum and supports the asymmetric configuration of the uplink and downlink carriers.
When a system is configured to perform HARQ (Hybrid Automatic Repeat Request), after receiving data transmitted on a downlink subframe, a User Equipment (UE) needs to feed back an HARQ acknowledgement message to a network side according to a receiving condition of the data, where the HARQ acknowledgement message may be ACK, NACK, or DTX, where ACK indicates correct reception of the data, NACK indicates a data decoding error, and DTX indicates data loss. If the HARQ acknowledgement message received by the receiving end has NACK or DTX, the corresponding data needs to be retransmitted.
In the carrier aggregation system of LTE, due to the fact that multiple downlink carriers are aggregated, when a base station occupies multiple downlink carriers in one downlink subframe to transmit data to a user or the base station transmits data to the user on multiple downlink subframes, the user needs to feed back multiple HARQ acknowledgement messages in one uplink subframe, and especially when the uplink subframe is an uplink subframe for feeding back a Scheduling Request (SR), how to feed back multiple HARQ acknowledgement message signals does not provide an effective solution.
Disclosure of Invention
The embodiment of the invention provides a method and a device for feeding back HARQ acknowledgement messages in a carrier aggregation system.
The embodiment of the invention is realized by the following technical scheme:
the embodiment of the invention provides a feedback method of HARQ acknowledgement messages in a carrier aggregation system, which comprises the following steps:
determining an uplink subframe for feeding back a Scheduling Request (SR);
and the user terminal UE transmits a plurality of HARQ acknowledgement message signals to be fed back on the uplink subframe.
The embodiment of the present invention further provides a feedback device for HARQ acknowledgement messages in a carrier aggregation system, including:
an SR subframe determining unit, configured to determine an uplink subframe for feeding back a scheduling request SR;
and the signal transmission unit is used for transmitting a plurality of HARQ acknowledgement message signals to be fed back on the uplink subframe.
According to the technical scheme provided by the embodiment of the invention, in the LTE carrier aggregation system, the uplink subframe for feeding back the SR is determined at first, and a plurality of HARQ acknowledgement message signals to be fed back are transmitted on the uplink subframe, so that the transmission of a plurality of HARQ acknowledgement message signals on one uplink subframe, especially on the uplink subframe for feeding back the SR, in the LTE carrier aggregation system is realized, and the performance of the LTE carrier aggregation system is improved.
Drawings
Fig. 1 is a schematic single frequency spectrum diagram of an LTE multi-carrier system in the background art of the present invention;
fig. 2 is a schematic diagram of an aggregated spectrum of an LTE multi-carrier system in the background of the invention;
fig. 3 is a first flowchart illustrating ACK/NACK feedback in a carrier aggregation system according to an embodiment of the present invention;
fig. 4 is a first flow chart illustrating ACK/NACK reception in a carrier aggregation system according to an embodiment of the present invention;
FIG. 5 is a second flowchart illustrating ACK/NACK feedback in a carrier aggregation system according to an embodiment of the invention;
FIG. 6 is a diagram illustrating combining ACK/NACK in an embodiment of the invention;
FIG. 7 is a diagram illustrating the multiplexing of SR and combined ACK/NACK in an embodiment of the invention;
FIG. 8 is a second flowchart illustrating ACK/NACK reception in a carrier aggregation system according to an embodiment of the invention;
fig. 9 is a first schematic diagram of a feedback apparatus for HARQ acknowledgement messages in a carrier aggregation system according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a second apparatus for feeding back HARQ acknowledgement messages in a carrier aggregation system according to an embodiment of the present invention;
fig. 11 is a third schematic diagram of a feedback apparatus for HARQ acknowledgement messages in a carrier aggregation system according to an embodiment of the present invention;
fig. 12 is a fourth schematic diagram of a feedback apparatus for HARQ acknowledgement messages in a carrier aggregation system according to an embodiment of the present invention.
Detailed Description
In order to provide a realization scheme for transmitting a plurality of HARQ acknowledgement messages on an uplink subframe in an LTE (long term evolution) carrier aggregation system, the embodiment of the invention provides a feedback method of the HARQ acknowledgement messages in the carrier aggregation system.
In the following description, the HARQ acknowledgement message is represented by ACK/NACK, where the ACK and NACK are or/and, and in practical application, the HARQ acknowledgement message may further include DTX.
In the ACK/NACK feedback method provided in the first embodiment of the present invention, the UE transmits a plurality of ACK/NACK signals to be fed back on an uplink subframe for feeding back an SR, and transmits a specified feedback signal on an uplink channel for feeding back the SR when the UE has the SR. Specifically, as shown in fig. 3, the feedback method includes the following steps:
In this step, the SR subframe is an uplink subframe for feeding back the SR determined according to a period of the feedback SR configured by the system for the UE, for example, the period of the feedback SR configured by the system for the UE is 20us, and when the period arrives, the corresponding subframe is the SR subframe.
In this step, when the UE has the SR, only the designated feedback signal needs to be transmitted in the corresponding uplink channel.
And step 304, feeding back a plurality of ACK/NACK signals by using a method preset by the system, wherein no signal is transmitted in an uplink channel corresponding to the SR.
In this step, the method for system presetting includes:
and determining an uplink channel for transmitting the appointed ACK/NACK according to a rule preset by a system, wherein the rule preset by the system specifies that an appointed ACK/NACK signal corresponds to one uplink channel. Specifically, an uplink channel for transmitting ACK/NACK may be determined according to an occupation status of each downlink control channel resource;
then, preprocessing a plurality of ACK/NACKs as required, for example, if the number of the ACK/NACKs is greater than a set threshold (the threshold is the number of ACK/NACKs that can be fed back at one time defined by the system), combining at least two of the plurality of ACK/NACKs before transmission, so that the number of the ACK/NACKs obtained after combination is not greater than the set threshold;
and transmitting the combined ACK/NACK in the corresponding uplink channel.
For ease of understanding, two specific embodiments for implementing this procedure in a TDD system are given below (where a number of ACK/NACKs is from M downlink subframes and the number exceeds a set threshold):
combining a plurality of ACK/NACK, wherein the combining mode can be as follows:
performing logical addition on the ACK/NACK corresponding to the M downlink subframes respectively based on the code word; or,
and performing logical addition on the ACK/NACK on a plurality of code words in each downlink subframe.
And carrying out baseband processing on a group of combined ACK/NACK obtained by combination and then transmitting the combined ACK/NACK by using a specific uplink channel.
The number of the uplink channel for transmitting the ACK/NACK is bound to the number of the downlink control signaling resource belonging to the user on the first subframe actually used by the user in the M subframes, that is, according to the number of the downlink control signaling resource belonging to the user on the first subframe actually used by the user in the M subframes, a unique number of the uplink channel can be obtained through a preset function.
The above description is only a specific implementation manner of feeding back multiple ACK/NACKs preset by the system in the embodiment of the present invention, but the method for feeding back multiple ACK/NACKs preset by the system in the embodiment of the present invention is not limited to the above implementation manner, and it should be understood by those skilled in the art that any method for feeding back multiple ACK/NACKs preset by the system belongs to the scope of implementing the embodiment of the present invention.
After transmitting the SR and the multiple ACKs/NACKs by using the independent channels according to the above procedure, the processing manner adopted by the network side is as shown in fig. 4, and includes the following steps:
step 401, the network side determines whether the currently received subframe is an SR subframe, if so, step 402 is executed, otherwise, step 404 is executed.
In this step, the network side first determines a period of feedback SR configured for the UE, and when the period arrives, the corresponding subframe is an SR subframe.
Step 402, detecting whether a signal is transmitted in an uplink channel corresponding to the SR, if so, executing step 403, otherwise, executing step 404.
Step 403, determining that the UE sends out the SR, and responding to the SR of the UE.
Step 404, detecting the ACK/NACK signal by using a method preset by the system, and determining whether to retransmit the data.
In step 404, according to different methods for feeding back multiple ACKs/NACKs preset by the system in step 304, the processing manner adopted by the receiving end is also different, which is specifically as follows:
the receiving end detects ACK/NACK signals transmitted in corresponding uplink channels, determines the state of ACK/NACK corresponding to each downlink subframe, and judges whether data on each downlink subframe needs to be retransmitted according to the determined state, specifically, if the data transmitted on any downlink subframe has decoding error or data loss at the receiving end before the maximum retransmission times (including initial transmission) is reached, the data on M downlink subframes need to be retransmitted; if the data on the M downlink subframes are all correctly received, no retransmission is required. The ACK/NACK signal transmitted in the corresponding uplink channel may be a composite ACK/NACK signal.
Since the receiving end detects the SR only to detect whether there is signal transmission in the uplink channel corresponding to the receiving end, in this embodiment, the feedback signal transmitted in the uplink channel corresponding to the SR may be:
any one of a plurality of ACK/NACK signals; or,
at least two of the plurality of ACK/NACK signals are combined to obtain any one of composite ACK/NACK signals.
That is, in step 303, the ACK/NACK signal is transmitted using an uplink channel previously allocated to the SR by the system.
Correspondingly, if the specified feedback signal transmitted in the uplink channel corresponding to the SR is an ACK/NACK signal, the receiving end may combine the same ACK/NACK signals from different channels for detection, where the different channels are the uplink channel for feeding back the SR and the uplink channel for transmitting the ACK/NACK determined according to the preset rule of the system. The performance of detecting the ACK/NACK signal is improved by signal combination, that is, when the SR corresponding channel is detected in step 402, the signal is combined with the signal transmitted on the uplink channel corresponding to the ACK/NACK, and then step 404 is executed, where the ACK/NACK signal detected in step 404 is the combined signal.
In the ACK/NACK feedback method provided in the second embodiment of the present invention, before transmitting a plurality of ACKs/NACKs to be fed back on an uplink subframe for feeding back an SR, an SR feedback requirement of a UE is mapped to an ACK/NACK, the mapped ACK/NACK and the ACK/NACK to be fed back are multiplexed, and an ACK/NACK signal obtained by multiplexing is transmitted on the uplink subframe for feeding back an SR, as shown in fig. 5 specifically, the process specifically includes the following steps:
step 501, judging whether the subframe of the current data to be transmitted is an SR subframe, if so, executing step 502, otherwise, executing step 507.
The specific implementation principle of this step is consistent with the principle described above in step 301, and will not be described in detail here.
Step 502, determining whether the number M of ACK/NACK signals to be fed back is greater than or equal to a set threshold (in the following description, it is assumed that the threshold is 4), if so, executing step 503; otherwise, step 504 is performed.
Step 503, at least two of the M ACK/NACK to be fed back are combined to obtain M 'composite ACK/NACK, wherein M' is more than or equal to 1 and less than or equal to 3.
In this step, when at least two of the M ACK/NACKs are combined, the combined ACK/NACK may be flexibly selected, as shown in fig. 6, if there are 4 ACK/NACKs, the 3 rd and 4 th ACK/NACKs may be combined. Of course, the 1 st and 2 nd ACK/NACKs may be combined, or the 2 nd and 3 rd ACK/NACKs may be combined.
Step 504, determining whether the UE has the SR, mapping the determination result to the ACK/NACK according to the preset corresponding relation, and multiplexing the ACK/NACK obtained by mapping and the ACK/NACK to be fed back.
In this step, the ACK/NACK to be fed back may be the original M ACK/NACKs to be fed back, or may be M' composite ACK/NACKs combined in step 503.
And step 505, determining a channel number corresponding to an uplink channel for transmitting the signal and feedback information of a set bit according to the number and the state of the multiplexed ACK/NACK signals.
In this step, determining, according to the number and state of the multiplexed ACK/NACK signals, a channel number corresponding to an uplink channel for transmitting the signal and feedback information of a set bit are specifically:
determining a corresponding mapping relation (or mapping table) according to the number of the multiplexed ACK/NACK, wherein the mapping relation corresponds to the number of the ACK/NACK, and the mapping relation is the corresponding relation among the state of the ACK/NACK, the number of an uplink channel and feedback information of a set bit, the ACK/NACK can be the ACK/NACK obtained after the ACK/NACK is compounded, the uplink channel comprises an uplink channel corresponding to the ACK/NACK and the uplink channel for feeding back the SR, and the bit number of the feedback information can be set according to the requirement;
and determining the uplink channel number corresponding to the state of the multiplexed ACK/NACK and the feedback information of the set bit according to the determined mapping relation.
And step 506, transmitting the feedback information of the set bit by the uplink channel corresponding to the determined uplink channel number.
And 507, feeding back a plurality of ACK/NACKs by using a method preset by the system.
The specific process of step 507 is substantially identical to the principle described in step 304 above, and will not be described in detail here.
In the step 504, the preset corresponding relationship may be:
the UE corresponds to ACK when having SR, and corresponds to NACK or DTX when not having SR.
The non-fixed pattern of the correspondence may be NACK or DTX when the UE has SR, or ACK when the UE does not have SR.
Fig. 7 shows a schematic diagram of adding SR on the basis of fig. 6, that is, feeding SR as the M' +1 st ACK/NACK signal.
And multiplexing the mapped ACK/NACK with the ACK/NACK to be fed back, namely inserting the mapped ACK/NACK into M (or M' multiplexed) ACK/NACKs to be fed back.
And after inserting the mapped ACK/NACK, the uplink channel number corresponding to the ACK/NACK to be fed back and the uplink channel number allocated by the system for the UE to feed back the SR need to be adjusted according to the insertion position of the mapped ACK/NACK. For example, in fig. 7, when the mapped ACK/NACK is inserted into the 4 th position, the uplink channel number allocated by the adjustment system for feeding back the SR is 3, and the channel number corresponding to the composite ACK/NACK obtained by combining the original 3 rd ACK/NACK and the original 4 th ACK/NACK is adjusted to be 2 (the channel number starts from 0).
In step 505, the specific implementation of determining the channel number corresponding to the uplink channel and the feedback information of the setting bit according to the signal status of the multiplexed ACK/NACK is as follows:
firstly, determining a corresponding mapping relation (or mapping table) according to the number of multiplexed ACK/NACK (acknowledgement/negative acknowledgement), then searching the determined mapping table according to the state of the combined composite ACK/NACK to obtain 2-bit feedback information b (0) and b (1) and a channel number corresponding to an uplink channel for transmitting the feedback information, and performing baseband processing on the b (0) and the b (1) and then transmitting the feedback information by using the corresponding uplink channel.
Each downlink subframe has an uplink channel number uniquely corresponding to the downlink subframe. In this embodiment, the UE needs to select a corresponding channel number and 2-bit feedback information b (0), b (1) according to a specific situation of a composite ACK/NACK corresponding to each downlink subframe, where values of b (0) and b (1) are related to the specific situation of the composite ACK/NACK corresponding to each downlink subframe, and a corresponding mapping table when there are 2 downlink subframes is given in the following table.
| Subframe 1, subframe 2 | nUL，m | b(0)，b(1) |
| ACK，ACK | nUL，1 | 1，1 |
| ACK，NACK/DTX | nUL，0 | 0，1 |
| NACK/DTX，ACK | nUL，1 | 0，0 |
| NACK/DTX，NACK | nUL，1 | 1，0 |
| NACK，DTX | nUL，0 | 1，0 |
| DTX，DTX | N/A (empty) | N/A (empty) |
The mapping table may also be provided by another manner capable of embodying the mapping relationship, and specifically, the mapping table in the embodiment of the present invention may refer to the specification of the TS36.213 standard, that is, the mapping table corresponds to different mapping tables according to different numbers of ACK/NACK after composition, and the ACK/NACK in the mapping table in the embodiment of the present invention may be a composite ACK/NACK obtained after combination, which is different from the specification of the TS36.213 standard.
After mapping the SR feedback requirement of the UE into ACK/NACK multiplexing to the ACK/NACK signal to be fed back by the UE according to the above procedure, a processing manner adopted by the network side is as shown in fig. 8, and includes the following steps:
In this step, the available uplink channel is subjected to blind detection to determine the uplink channel for transmitting signals. The available uplink channels include: and the uplink channels corresponding to the multiple ACK/NACK respectively and the uplink channel allocated by the system for feeding back the SR for the UE.
In this step, the ACK/NACK fed back is: and mapping the feedback requirement of the UE on the SR into composite ACK/NACK obtained by multiplexing the ACK/NACK into the ACK/NACK signal to be fed back by the UE.
In this step, first, the state of the mapped ACK/NACK is determined according to the state of the fed back ACK/NACK signal, specifically, the state of the mapped ACK/NACK is determined according to an insertion position of the mapped ACK/NACK, that is, a corresponding sequence number in the fed back ACK/NACK (for example, fig. 7 corresponds to the 4 th sequence number in the fed back ACK/NACK), which is required by the user's SR, and then, whether the UE has an SR is determined according to the state of the mapped ACK/NACK and a preset corresponding relationship.
The specific process of this step is substantially identical to the principle described in step 404 above and will not be described in detail here.
In this embodiment, if a method predetermined by the system is to feed back multiple ACK/NACK packets, the requirement of the UE for feeding back the SR may be mapped to that ACK/NACK is multiplexed with one group of ACK/NACK, and ACK/NACK of other groups continue to be fed back by the method predetermined by the system.
In the ACK/NACK feedback method provided in the third embodiment of the present invention, if the UE has an SR, a plurality of ACK/NACK signals to be fed back are transmitted on an uplink channel for feeding back the SR.
Preferably, the ACK/NACK signals to be fed back transmitted on the uplink channel for feeding back the SR are combined to obtain a composite ACK/NACK signal.
In this embodiment, when the UE has the SR, a plurality of ACK/NACK signals to be fed back are transmitted in the uplink channel for feeding back the SR, and no signal is transmitted in the channel for feeding back the ACK/NACK determined according to the system preset method, thereby saving channel resources.
Correspondingly, when the receiving end detects that the uplink channel which is allocated by the system for the UE and used for feeding back the SR has signal transmission, the receiving end determines that the UE has the SR, further detects the signal transmitted in the uplink channel used for feeding back the SR, and determines the state of the ACK/NACK.
In the ACK/NACK feedback method provided in the fourth embodiment of the present invention, when a UE has an SR, any one of ACK/NACK signals to be fed back or any one of composite ACK/NACK signals obtained by combining the ACK/NACK signals to be fed back is transmitted in an uplink channel used for transmitting the SR; and transmitting other signals in the ACK/NACK signals to be fed back, namely other signals except the ACK/NACK signals transmitted in the uplink channel for transmitting the SR, in the uplink channel for feeding back the ACK/NACK determined according to the system preset method.
The specific feedback process is consistent with the basic principle described in steps 301 to 304 in the first embodiment; the specific receiving process is consistent with the basic principle described in steps 401 to 404 in the first embodiment, and after the signal is transmitted to the receiving end, the signal transmitted on the uplink channel for feeding back the SR needs to be combined with the signal transmitted on the uplink channel for feeding back the ACK/NACK determined according to the system preset method, and then the combined signal is detected, so as to enhance the accuracy of detecting the ACK/NACK signal by the network side.
Corresponding to the feedback method described in the foregoing embodiment, an embodiment of the present invention further provides a feedback apparatus for HARQ acknowledgement messages in a carrier aggregation system, and as shown in fig. 9, the apparatus includes:
SR subframe determination section 901 and signal transmission section 902. Wherein:
an SR subframe determining unit 901, configured to determine an uplink subframe for feeding back a scheduling request SR;
a signal transmission unit 902, configured to transmit a plurality of HARQ acknowledgement message signals to be fed back on the uplink subframe determined by the SR subframe determination unit 901.
In one embodiment, the signal transmission unit is further configured to: and when the UE has the SR, transmitting a specified feedback signal on an uplink channel for feeding back the SR.
Specifically, the designated feedback signal transmitted by the signal transmission unit includes:
any one of a plurality of HARQ acknowledgement message signals to be fed back; or,
and any one of the composite HARQ acknowledgement message signals obtained by combining the plurality of HARQ acknowledgement message signals to be fed back.
In one embodiment, as shown in fig. 10, the feedback device shown in fig. 9 further includes:
a signal combining unit 903, configured to combine the specified feedback signal transmitted by the signal transmitting unit 902 and the HARQ acknowledgment message signal to be fed back at the receiving end.
In an embodiment, the signal transmission unit 902 is further configured to:
when the number of the HARQ acknowledgement message signals to be fed back is larger than a set threshold, at least two of the HARQ acknowledgement message signals to be fed back are combined before the HARQ acknowledgement message signals to be fed back are transmitted, and HARQ acknowledgement message signals not larger than the threshold are obtained.
In an embodiment, the signal transmission unit 902 is specifically configured to:
on the uplink subframe determined by the SR subframe determining unit, transmitting a specified HARQ acknowledgement message signal by an uplink channel determined according to a system preset rule; wherein,
the system preset rule comprises the following steps: one designated HARQ acknowledgment message signal corresponds to one of the uplink channels.
In one embodiment, as shown in fig. 11, the feedback apparatus shown in fig. 9 further includes:
a signal multiplexing unit 904, configured to map an SR feedback requirement of the UE into an HARQ acknowledgment message before the signal transmission unit 902 transmits the HARQ acknowledgment message signal to be fed back, and multiplex the mapped HARQ acknowledgment message with the HARQ acknowledgment message to be fed back;
correspondingly, the signal transmission unit 902 is specifically configured to: on the uplink subframe, the transmission signal multiplexing unit 904 multiplexes the obtained HARQ acknowledgment message signal.
In an embodiment, the signal multiplexing unit 904 included in the feedback apparatus shown in fig. 11 is specifically configured to:
and determining whether the UE has the SR, and mapping the determination result into the HARQ acknowledgement message according to the preset corresponding relation.
In an embodiment, the signal multiplexing unit 904 included in the feedback apparatus shown in fig. 11 is specifically configured to:
if the number M of the HARQ acknowledgement messages to be fed back is smaller than a set threshold, inserting the mapped HARQ acknowledgement messages into the M HARQ acknowledgement messages;
if the number M of the HARQ acknowledgement messages to be fed back is larger than or equal to a set threshold, combining at least two of the HARQ acknowledgement messages to be fed back to obtain N HARQ acknowledgement messages, and inserting the mapped HARQ acknowledgement messages into the N HARQ acknowledgement messages; wherein N is less than the threshold.
In an embodiment, the signal transmission unit 902 included in the feedback apparatus shown in fig. 11 may further specifically include: a channel and information determination module and a transmission module (not shown). Wherein,
a channel and information determining module, configured to determine, according to the number and state of HARQ acknowledgment messages multiplexed by the signal multiplexing unit 904, an uplink channel number and corresponding feedback information for transmitting a signal;
and the transmission module is used for transmitting the feedback information on the uplink channel corresponding to the uplink channel number determined by the channel and information determination module.
In a more specific embodiment, the channel and information determining module is specifically configured to:
determining a preset mapping relation according to the number of the HARQ acknowledgement messages multiplexed by the signal multiplexing unit 904; the mapping relation corresponds to the number of the HARQ confirmation messages, and the mapping relation is the corresponding relation among the state of the HARQ confirmation messages, the uplink channel numbers and the feedback information; the uplink channel comprises an uplink channel corresponding to the HARQ acknowledgement message to be fed back and an uplink channel for feeding back the SR;
and determining the uplink channel number and the feedback information corresponding to the state of the HARQ acknowledgement message obtained by multiplexing according to the determined mapping relation.
In one embodiment, as shown in fig. 12, the feedback device shown in fig. 11 further includes:
a signal analyzing unit 905, configured to determine, at the receiving end, a state of the HARQ acknowledgment message according to a preset mapping relationship and a channel number corresponding to an uplink channel for transmitting the feedback information and the feedback information transmitted by the signal transmitting unit 902, determine, according to the state of the HARQ acknowledgment message, a state of the mapped HARQ acknowledgment message, and determine, according to the state of the mapped HARQ acknowledgment message, whether the UE feeds back the SR.
In another embodiment of the present invention, the signal transmission unit 902 shown in fig. 9 is further configured to:
and when the UE has the SR, transmitting a plurality of HARQ acknowledgement message signals to be fed back on an uplink channel for feeding back the SR.
Preferably, the plurality of HARQ acknowledgement message signals to be fed back transmitted in the uplink channel for feeding back the SR are combined to obtain a composite HARQ acknowledgement message signal.
According to the technical scheme provided by the embodiment of the invention, in the LTE carrier aggregation system, the uplink subframe for feeding back the SR is determined at first, and a plurality of HARQ acknowledgement message signals to be fed back are transmitted on the uplink subframe, so that the transmission of a plurality of HARQ acknowledgement message signals on one uplink subframe, especially on the uplink subframe for feeding back the SR, in the LTE carrier aggregation system is realized, and the performance of the LTE carrier aggregation system is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (25)
1. A feedback method for HARQ acknowledgement messages in a carrier aggregation system is characterized by comprising the following steps:
determining an uplink subframe for feeding back a Scheduling Request (SR);
and the user terminal UE transmits a plurality of HARQ acknowledgement message signals to be fed back on the uplink subframe.
2. The feedback method of claim 1, wherein when the UE has an SR, further comprising:
and the UE transmits a specified feedback signal on an uplink channel for feeding back the SR.
3. The feedback method of claim 2, wherein the specifying the feedback signal comprises:
any one of the HARQ acknowledgement message signals to be fed back; or,
and any one of the composite HARQ acknowledgement message signals obtained by combining the HARQ acknowledgement message signals to be fed back.
4. The feedback method of claim 3, further comprising:
and combining the appointed feedback signal and the HARQ acknowledgement message signal to be fed back at a receiving end.
5. The feedback method according to claim 1 or 2, wherein if the number of the HARQ acknowledgment message signals to be fed back is greater than the set threshold, before transmitting a plurality of HARQ acknowledgment messages to be fed back, the method further comprises:
and combining at least two of the HARQ acknowledgement message signals to be fed back to obtain HARQ acknowledgement message signals not greater than the threshold value.
6. The feedback method as claimed in claim 1, wherein on the uplink subframe, a designated HARQ acknowledgement message signal is transmitted by an uplink channel determined according to a system preset rule;
the system preset rule comprises the following steps: one designated HARQ acknowledgment message signal corresponds to one of the uplink channels.
7. The feedback method of claim 1, wherein before transmitting the plurality of HARQ acknowledgement message signals to be fed back, further comprising:
mapping the SR feedback requirement of the UE into a HARQ acknowledgement message, and multiplexing the mapped HARQ acknowledgement message with the HARQ acknowledgement message to be fed back;
the transmitting of the plurality of HARQ acknowledgement message signals to be fed back specifically includes: and transmitting the multiplexed HARQ acknowledgement message signal.
8. The feedback method of claim 7, wherein multiplexing the mapped HARQ acknowledgement message with the HARQ acknowledgement message to be fed back comprises:
if the number M of the HARQ acknowledgement messages to be fed back is smaller than a set threshold, inserting the mapped HARQ acknowledgement messages into the M HARQ acknowledgement messages;
if the number M of the HARQ acknowledgement messages to be fed back is larger than or equal to the set threshold, combining at least two of the HARQ acknowledgement messages to be fed back to obtain N HARQ acknowledgement messages, and inserting the mapped HARQ acknowledgement messages into the N HARQ acknowledgement messages; wherein N is less than the threshold.
9. The feedback method of claim 7, wherein transmitting the multiplexed HARQ acknowledgment message signal comprises:
determining an uplink channel number for transmitting signals and corresponding feedback information according to the number and the state of the HARQ acknowledgement messages obtained through multiplexing;
and transmitting the feedback information on the uplink channel corresponding to the determined uplink channel number.
10. The feedback method of claim 9, wherein determining the uplink channel number and the corresponding feedback information for transmitting signals according to the number and the state of the HARQ acknowledgment messages obtained through multiplexing comprises:
determining a preset mapping relation according to the number of the multiplexed HARQ acknowledgement messages; the mapping relation corresponds to the number of the HARQ acknowledgement messages, and the mapping relation is the corresponding relation among the state of the HARQ acknowledgement messages, the uplink channel numbers and the feedback information; the uplink channel comprises an uplink channel corresponding to the HARQ acknowledgement message to be fed back and an uplink channel for feeding back the SR;
and determining the uplink channel number and the feedback information corresponding to the state of the HARQ acknowledgement message obtained by multiplexing according to the mapping relation.
11. The feedback method of claim 10, further comprising:
according to the mapping relation, determining the state of the HARQ acknowledgement message at a receiving end according to the channel number corresponding to the uplink channel for transmitting the feedback information and the feedback information;
determining the state of the HARQ confirmation message obtained by mapping according to the state of the HARQ confirmation message;
and determining whether the UE feeds back the SR or not according to the state of the HARQ confirmation message obtained by mapping.
12. The feedback method of claim 1, wherein transmitting a plurality of HARQ acknowledgement message signals to be fed back when the UE has an SR comprises:
and transmitting the plurality of HARQ acknowledgement message signals to be fed back on an uplink channel for feeding back the SR.
13. The feedback method of claim 12, wherein the HARQ acknowledgment message signal to be fed back is a combined HARQ acknowledgment message signal.
14. A feedback apparatus for HARQ acknowledgement messages in a carrier aggregation system, comprising:
an SR subframe determining unit, configured to determine an uplink subframe for feeding back a scheduling request SR;
and the signal transmission unit is used for transmitting a plurality of HARQ acknowledgement message signals to be fed back on the uplink subframe.
15. The feedback apparatus of claim 14, wherein the signal transmission unit is further configured to:
and when the UE has the SR, transmitting a specified feedback signal on an uplink channel for feeding back the SR.
16. The feedback apparatus of claim 15, wherein the designated feedback signal transmitted by the signal transmission unit comprises:
any one of the HARQ acknowledgement message signals to be fed back; or,
and any one of the composite HARQ acknowledgement message signals obtained by combining the HARQ acknowledgement message signals to be fed back.
17. The feedback apparatus of claim 16, further comprising:
and the signal combining unit is used for combining the specified feedback signal transmitted by the signal transmission unit and the HARQ acknowledgement message signal to be fed back at a receiving end.
18. The feedback apparatus according to claim 14 or 15, wherein the signal transmission unit is further configured to:
when the number of the HARQ acknowledgement message signals to be fed back is larger than a set threshold, at least two of the HARQ acknowledgement message signals to be fed back are combined before the HARQ acknowledgement message signals to be fed back are transmitted, and HARQ acknowledgement message signals not larger than the threshold are obtained.
19. The feedback apparatus as claimed in claim 14, wherein the signal transmission unit is specifically configured to:
on the uplink subframe, transmitting a specified HARQ acknowledgement message signal by an uplink channel determined according to a preset rule of a system;
the system preset rule comprises the following steps: one designated HARQ acknowledgment message signal corresponds to one of the uplink channels.
20. The feedback apparatus of claim 14, further comprising:
a signal multiplexing unit, configured to map an SR feedback requirement of the UE into an HARQ acknowledgement message before the signal transmission unit transmits the HARQ acknowledgement message signal to be fed back, and multiplex the mapped HARQ acknowledgement message with the HARQ acknowledgement message to be fed back;
the signal transmission unit is specifically configured to: and transmitting the multiplexed HARQ acknowledgement message signal on the uplink subframe.
21. The feedback apparatus as claimed in claim 20, wherein said signal multiplexing unit is specifically configured to:
if the number M of the HARQ acknowledgement messages to be fed back is smaller than a set threshold, inserting the mapped HARQ acknowledgement messages into the M HARQ acknowledgement messages;
if the number M of the HARQ acknowledgement messages to be fed back is larger than or equal to the set threshold, combining at least two of the appointed HARQ acknowledgement messages to obtain N HARQ acknowledgement messages, and inserting the mapped HARQ acknowledgement messages into the N HARQ acknowledgement messages; wherein N is less than the threshold.
22. The feedback apparatus as claimed in claim 20, wherein said signal transmission unit comprises:
a channel and information determining module, configured to determine, according to the number and state of HARQ acknowledgement messages obtained by multiplexing by the signal multiplexing unit, an uplink channel number used for transmitting a signal and corresponding feedback information;
and the transmission module is used for transmitting the feedback information on the uplink channel corresponding to the uplink channel number determined by the channel and information determination module.
23. The feedback apparatus of claim 22, wherein the channel and information determination module is specifically configured to:
determining a preset mapping relation according to the number of the HARQ acknowledgement messages obtained by multiplexing the signal multiplexing unit; the mapping relation corresponds to the number of the HARQ acknowledgement messages, and the mapping relation is the corresponding relation among the state of the HARQ acknowledgement messages, the uplink channel numbers and the feedback information; the uplink channel comprises an uplink channel corresponding to the HARQ acknowledgement message to be fed back and an uplink channel for feeding back the SR;
and determining the uplink channel number and the feedback information corresponding to the state of the HARQ acknowledgement message obtained by multiplexing according to the mapping relation.
24. The feedback apparatus of claim 23, further comprising:
and the signal analysis unit is used for determining the state of the HARQ acknowledgement message at a receiving end according to the mapping relation and the channel number corresponding to the uplink channel for transmitting the feedback information and the feedback information transmitted by the signal transmission unit, determining the state of the mapped HARQ acknowledgement message according to the state of the HARQ acknowledgement message, and determining whether the UE feeds back the SR according to the state of the mapped HARQ acknowledgement message.
25. The feedback apparatus of claim 14, wherein the signal transmission unit is further configured to:
and when the UE has the SR, transmitting the plurality of HARQ acknowledgement message signals to be fed back on an uplink channel for feeding back the SR.
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