CN101964704A - Hybrid automatic retransmission request communication method, device and communication system - Google Patents
Hybrid automatic retransmission request communication method, device and communication system Download PDFInfo
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Abstract
The invention discloses a hybrid automatic retransmission request communication method, a device and a communication system. The method comprises the following steps: receiving a first hybrid automatic retransmission request (HARQ) message; selecting a member carrier having the minimum time delay according to the time delay between the first HARQ message and a second HARQ message of N member carriers which can be used for transmitting the second HARQ message in a carrier aggregation, wherein N is an integral number greater than 1, the first HARQ message is current data and the second HARQ message is an acknowledgement/negative acknowledgement message (ACK/NACK message), or the first HARQ message is the ACK/NACK message and the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data; and transmitting the second HARQ message by means of the member carrier having the minimum time delay. The embodiment of the invention can reduce HARQ RTT, thereby meeting the requirements of real-time services.
Description
Technical Field
The present invention relates to communication technologies, and in particular, to a communication method, an apparatus, and a communication system for hybrid automatic repeat request.
Background
In the third generation partnership project (3)rd GGeneration Partnership Project, hereinafter abbreviated: 3GPP) Evolved Universal Terrestrial Radio Access (Evolved Universal Radio Access, hereinafter referred to as: E-UTRA), the sending and receiving of data supports physical layer Hybrid Automatic Repeat Request (Hybrid Automatic Repeat Request, hereinafter referred to as: HARQ) technique, thereby making it possible to reduce data transmission delay and to obtain a higher data transmission rate. In the HARQ technology, a data receiver needs to feed back an Acknowledgement (ACK) message or a Negative-Acknowledgement (NACK) message to a data sender, that is: the ACK/NACK message informs the data sender whether the data sender correctly receives the data it sends. The feedback ACK message indicates that the data receiver correctly receives the data sent by the data sender, and the feedback NACK message indicates that the data receiver incorrectly receives the data sent by the data sender or the received data is wrong.
In the 3GPP E-UTRA system, the HARQ process for downlink data transmission is as follows: a base station allocates a Physical Downlink Shared Channel (PDSCH) and a physical uplink ACK Channel for User Equipment (UE), and transmits data to the UE on the allocated PDSCH; the UE receives data sent by the base station on the allocated PDSCH, correspondingly generates an ACK message or a NACK message according to whether the data is correctly received, and then feeds back the generated ACK/NACK message to the base station on the allocated physical uplink ACK channel; and the base station receives the ACK/NACK message fed back by the UE, and if the base station receives the NACK message and the number of times of sending the data to the UE does not reach the preset maximum retransmission number, the base station sends the data to the UE again according to the process, otherwise, if the base station receives the ACK message or receives the NACK message and the number of times of sending the data to the UE reaches the preset maximum retransmission number, the base station sends the next data to the UE according to the process. The HARQ process for uplink data transmission is as follows: a base station allocates a Physical Uplink Shared Channel (PUSCH) and a Physical downlink ACK Channel for UE; the UE sends data to the base station on the PUSCH allocated by the base station; a base station receives data sent by UE on a PUSCH allocated to the UE, correspondingly generates an ACK message or a NACK message according to whether the data is correctly received, and then feeds back the generated ACK/NACK message to the UE on an allocated physical downlink ACK channel; and the UE receives the ACK/NACK message fed back by the base station, if the UE receives the NACK message and the number of times of sending the data does not reach the preset maximum retransmission number, the data is sent to the base station again according to the process, otherwise, if the UE receives the ACK message or receives the NACK message and the number of times of sending the data to the base station reaches the preset maximum retransmission number, the next data is sent to the base station according to the process.
In the HARQ process of data transmission, under normal conditions, there is a fixed time delay between receiving the current data and feeding back ACK/NACK information, which is recorded as
There is also a fixed delay between receiving the ACK/NACK message and resending the current data or sending the next data, denoted as
In a 3GPPE-UTRA Frequency Division Duplex (Frequency Division Duplex, hereinafter referred to as FDD) system,
in a 3GPP E-UTRA Time Division Duplex (TDD) system, for downlink data transmission, the Time for feeding back an ACK/NACK message is the closest uplink subframe Time that is not less than 4ms away from the Time of receiving the current data, that is:
is the time interval from the moment of receiving the current data to the moment of the nearest uplink subframe; the time for retransmitting the current data or transmitting the next data is the latest downlink subframe time which is not less than 4ms away from the time for receiving the ACK/NACK message, namely:
is the time interval from the moment of receiving the ACK/NACK message to the moment of the latest downlink subframe. For uplink data transmission, the time when the ACK/NACK message is fed back is the closest downlink subframe time that is not less than 4ms away from the time when the current data is received, that is:
is the time interval between the moment of receiving the current data and the moment of the nearest downlink subframe. The time for retransmitting the current data or transmitting the next data is the nearest uplink subframe time which is not less than 4ms away from the time for receiving the ACK/NACK message, namely:
is the time interval between the moment of receiving the ACK/NACK message and the nearest uplink subframe moment. Wherein,and
usually given by HARQ timing relationship under different uplink and downlink subframe ratios.
The 3GPP E-UTRA system is also generally called a Long Term Evolution (LTE) system, and as a further evolution and enhancement system of the LTE system, a carrier Aggregation (carrieraggrreaction) technology, also called a Spectrum Aggregation (Spectrum Aggregation) technology, or a Bandwidth Extension (Bandwidth Extension) technology is introduced in a Long Term evolution-Advanced (LTE-a) system, and spectrums of two or more component carriers (component carriers) are aggregated together to support a wider transmission Bandwidth and meet a peak data rate requirement of the international telecommunication union for a fourth generation communication technology. Wherein all component carriers whose spectrum is aggregated together constitute an aggregated carrier. In carrier aggregation, the frequency spectrum of each component carrier may be an adjacent continuous frequency spectrum, a non-adjacent frequency spectrum in the same frequency band, or a discontinuous frequency spectrum in different frequency bands. Each member carrier in the carrier aggregation has an independent HARQ process, in an LTE-A system, UE can select to access one member carrier or simultaneously access a plurality of member carriers for data transceiving according to the capability and service requirements of the UE, and the UE can select different numbers of uplink and downlink member carriers.
In the LTE-a TDD system, when discontinuous frequency spectrums in different frequency bands are used for carrier aggregation, different uplink and downlink subframe ratios need to be set on component carriers in different frequency bands, respectively, in order to avoid mutual interference between uplink and downlink component carriers in different frequency bands. In the process of implementing the invention, the inventor finds that in the existing LTE-A TDD system, when the uplink and downlink subframe proportion of the member carrier in different frequency bands is different, the time delay is different
And
the method may also be different, and the prior art cannot select a component carrier for feeding back an ACK/NACK message, retransmitting current data, or transmitting next data, so that the Round Trip Time (RTT), also referred to as: HARQ RTT, and thus cannot meet real-time traffic demands.
Disclosure of Invention
The embodiment of the invention provides a hybrid automatic repeat request communication method, a device and a communication system, which can reduce HARQ RTT so as to meet the real-time service requirement.
The embodiment of the invention provides a hybrid automatic repeat request communication method, which comprises the following steps:
receiving a first hybrid automatic repeat request (HARQ) message;
selecting a member carrier with the minimum time delay from N member carriers which can be used for sending a second HARQ message according to the time delay between a first HARQ message and the second HARQ message of the N member carriers which can be used for sending the second HARQ message in the aggregated carriers, wherein N is an integer larger than 1; the first HARQ message is current data, and the second HARQ message is an acknowledgement response message or a negative acknowledgement message ACK/NACK message, or the first HARQ message is an ACK/NACK message, and the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data;
and sending a second HARQ message by utilizing the member carrier with the minimum time delay.
An embodiment of the present invention provides a hybrid automatic repeat request communication apparatus, including:
a receiving module, configured to receive a first HARQ message;
a selecting module, configured to select, according to a time delay between a first HARQ message and a second HARQ message of N component carriers that are available to send a second HARQ message in an aggregated carrier, a component carrier with a minimum time delay from the N component carriers that are available to send the second HARQ message; the first HARQ message is current data, and the second HARQ message is an ACK/NACK message, or the first HARQ message is an ACK/NACK message, and the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data;
and a sending module, configured to send a second HARQ message using the component carrier with the minimum time delay.
The user equipment according to the embodiment of the present invention includes the harq communication apparatus according to the above embodiment of the present invention.
A base station provided in an embodiment of the present invention includes the harq communication apparatus provided in the above embodiment of the present invention.
In the communication system, the user terminal and the base station provided in the embodiment of the present invention, the user terminal and/or the base station includes the harq communication apparatus provided in the above embodiment of the present invention.
Based on the communication method, device and communication system for hybrid automatic repeat request provided by the embodiments of the present invention, in the HARQ process, when different component carriers in the aggregated carrier have different uplink and downlink subframe ratios, after receiving the first HARQ message, the UE or the base station selects the component carrier with the smallest time delay between the first HARQ message and the second HARQ message to send the second HARQ message, thereby effectively reducing the HARQ RTT and meeting the real-time service requirements.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of an embodiment of an HARQ communication method of the present invention;
FIG. 2 is a schematic diagram of a radio frame structure of two component carriers of 10 DL: 0UL and 0 DL: 10UL uplink and downlink sub-frame ratios;
fig. 3 is a flowchart of another embodiment of an HARQ communication method of the present invention;
fig. 4 is a schematic diagram of a radio frame structure of two component carriers;
FIG. 5 is a schematic diagram of a radio frame structure after relative timing relationship adjustment according to the present invention;
FIG. 6 is a schematic diagram of another radio frame structure after relative timing relationship adjustment according to the present invention;
fig. 7 is a diagram illustrating a timing of transmitting an HARQ message based on the frame structure shown in fig. 4;
fig. 8 is a schematic structural diagram of an HARQ communication apparatus according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another embodiment of an HARQ communication apparatus according to the present invention;
fig. 10 is a schematic structural diagram of an HARQ communication apparatus according to another embodiment of the present invention;
fig. 11 is a schematic structural diagram of an HARQ communication device according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of an HARQ communication method according to an embodiment of the present invention. As shown in fig. 1, the HARQ communication method of the embodiment includes:
And 102, selecting the member carrier with the minimum time delay from the N member carriers which can be used for sending the second HARQ message according to the time delay between the first HARQ message and the second HARQ message of the N member carriers which can be used for sending the second HARQ message in the aggregated carrier. Wherein N is an integer greater than 1.
The first HARQ message is current data, and correspondingly, the second HARQ message is an ACK/NACK message; or, the first HARQ message is an ACK/NACK message, and the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data.
And 103, transmitting the second HARQ message by using the member carrier with the minimum time delay.
Based on the HARQ communication method provided in the above embodiment of the present invention, when different component carriers in the aggregated carrier have different uplink and downlink subframe ratios, after receiving the first HARQ message, the UE or the base station may select the component carrier with the smallest time delay between the first HARQ message and the second HARQ message to send the second HARQ message, thereby effectively reducing HARQ RTT in the TDD communication system, including the LTE TDD communication system and the LTE-a TDD communication system, and meeting the real-time service requirement.
According to a specific embodiment of the present invention, in the foregoing HARQ communication method embodiment, step 101 may specifically be: the UE receives current data sent by the base station through the PDSCH. Correspondingly, in step 102, the time delay between the first HARQ message and the second HARQ message is specifically: the uplink time which is closest to the time of receiving the first HARQ message and is not less than the first preset constant time T0; in step 103, the sending the second HARQ message specifically includes: and sending the ACK/NACK message to the base station through a physical uplink ACK channel.
According to another specific embodiment of the present invention, in the foregoing HARQ communication method embodiment, step 101 may specifically be: and the base station receives the current data transmitted by the UE through the PUSCH. Correspondingly, in step 102, the time delay between the first HARQ message and the second HARQ message is specifically: the downlink time which is closest to the time of receiving the first HARQ message and is not less than the first preset constant time T0; in step 103, the sending the second HARQ message specifically includes: and sending the ACK/NACK message to the UE through a physical downlink ACK channel.
According to another specific embodiment of the present invention, in the foregoing HARQ communication method embodiment, step 101 may specifically be: and the UE receives the ACK/NACK message sent by the base station through the physical downlink ACK channel. Correspondingly, in step 102, the time delay between the first HARQ message and the second HARQ message is specifically: the uplink time which is not less than the nearest uplink time of the second preset constant time T1 from the time of receiving the ACK/NACK message; in step 103, the sending the second HARQ message specifically includes: and transmitting previous data corresponding to the received ACK/NACK message or next data of the previous data to the base station through a PUSCH.
According to still another specific embodiment of the present invention, in the foregoing HARQ communication method embodiment, step 101 may specifically be: and the base station receives the ACK/NACK message sent by the UE through a physical uplink ACK channel. Correspondingly, in step 102, the time delay between the first HARQ message and the second HARQ message is specifically: the downlink time which is not less than the nearest downlink time of the second preset constant time from the time of receiving the ACK/NACK message; in step 103, the sending the second HARQ message specifically includes: and transmitting previous data or next data of the previous data corresponding to the received ACK/NACK message to the UE through the PDSCH.
The HARQ communication method of each embodiment of the invention can be applied to the HARQ process carried out in the UE and can also be applied to the HARQ process carried out in the base station. When the first HARQ message is current data, corresponding to the UE and the base station, the current data is transmitted through the PDSCH/PUSCH respectively, and assuming that the UE and the base station receive the current data through the PDSCH/PUSCH at time n respectively, the time for feeding back the ACK/NACK message as the second HARQ message is the time when the selected i0 component carrier with the smallest time delay is used correspondingly
Then 
Wherein, for transmitting current data through PDSCH,indicating that the distance time n of the ith component carrier is not less than a preset constantThe most recent upstream time at time T0; for the transmission of the current data over the PUSCH,indicating that the ith component carrier is not less than the nearest downlink time of a preset constant time T0 from the time n. In the LTE-a system, an uplink time or a downlink time is in units of subframes, where the length of a subframe is 1ms, and therefore, the uplink time refers to the uplink subframe time, the downlink time refers to the downlink subframe time, and the preset constant time T0 is 4ms, that is: 4 subframes long.
Further, at the time of day
After receiving the ACK/NACK message, the ACK/NACK message can be transmitted at any time according to whether the preset retransmission condition is met
And sending the previous data or sending the next data corresponding to the ACK/NACK message through the selected ith 1 component carrier with the minimum time delay, namely: new data is transmitted. Wherein,
for transmitting the ACK/NACK message through the physical uplink ACK channel,indicating the ith component carrier distance time
The latest uplink time not less than the preset constant time T1; for transmitting the ACK/NACK message through the physical downlink ACK channel,
indicating the ith component carrier distance time
The latest downstream time not less than the preset constant time T1.
In addition, in step 102 of the HARQ communication method according to the above embodiment of the present invention, the time delay between the first HARQ message and the second HARQ message of the N component carriers, which are obtained and stored in advance, may be directly compared to select the component carrier with the smallest time delay. Or, before step 102, the HARQ timing relationship under the preset uplink and downlink subframe ratios of the N component carriers may be respectively obtained, and the time delay between the first HARQ message and the second HARQ message of the N component carriers may be immediately obtained according to the HARQ timing relationship of the N component carriers.
In step 102 of the foregoing embodiment, if there are more than two component carriers with the minimum delay, one component carrier with the minimum delay may be selected from the more than two component carriers with the minimum delay according to a preset setting, for example: the component carrier with the smallest i or the component carrier with the largest i or the least load component carrier may be selected. In addition, information interaction between the UE and the base station may also be performed, for example: and the base station informs the UE of the component carrier with the minimum time delay selected by the base station.
In the LTE TDD system, different carriers with complementary subframe configurations may be aggregated to form an aggregated carrier. The complementary subframe ratio refers to the subframe ratio of A DL to B UL and B DL to A UL. Wherein, DL represents downlink subframes including special subframes; UL represents an uplink subframe, A and B respectively show the number of uplink subframes and downlink subframes in the continuous A + B subframes, A, B is an integer greater than or equal to zero respectively, but A, B is not zero at the same time. In the 7-subframe ratio supported by the LTE TDD system, only the complementary subframe ratio of 3 DL: 2UL and 2 DL: 3UL exists. Wherein, 3 DL: 2UL indicates that there are 3 downlink subframes and 2 uplink subframes in every 5 consecutive subframes, and 2 DL: 3UL indicates that there are 2 downlink subframes and 3 uplink subframes in every 5 consecutive subframes. To support more efficient carrier aggregation to support wider transmission bandwidthIn the LTE-a TDD system, the uplink and downlink subframe ratios of 10 DL: 0UL and 0 DL: 10UL may also be supported and aggregated together, as shown in fig. 2, which is a schematic diagram of a radio frame structure of two component carriers of the uplink and downlink subframe ratios of 10 DL: 0UL and 0 DL: 10 UL. FIG. 2 shows the subframe distribution of the two component carriers in a radio frame with a length Lradio_frame10ms, namely: 10 subframes long. Center frequency of f1The ratio of uplink subframe to downlink subframe of the member carrier is 0 DL: 10UL, and the center frequency is f2The ratio of uplink and downlink sub-frames of the member carrier is 10 DL: 0 UL. At a central frequency f1In the component carrier of (1), one subframe is composed of three parts, namely a downlink pilot (DwPTS), an uplink pilot (UpPTS) and a blank time slot (Gap), and the subframe is a special subframe and is generally regarded as a downlink subframe with a special structure.
Fig. 3 is a flowchart of another embodiment of an HARQ communication method of the present invention. In this embodiment, the aggregated carriers include component carriers with complementary subframe configurations. As shown in fig. 3, the HARQ communication method of this embodiment includes:
Specifically, the first HARQ message may be current data or may be an ACK/NACK message.
When the first HARQ message is the current data, the second HARQ message is an ACK/NACK message according to whether the current data is correctly received; and when the first HARQ message is the ACK/NACK message, the second HARQ message is the previous data or the next data of the previous data corresponding to the ACK/NACK message according to whether the preset data retransmission condition is met.
When the aggregated carrier comprises member carriers with complementary subframe ratio, the member carrier with the minimum time delay is selected from the N member carriers with complementary subframe ratio to transmit the second HARQ message, so that the method has a simpler HARQ timing relationship, reduces the complexity of a TDD communication system, further reduces the HARQ RTT, and has the same HARQ RTT as an FDD communication system.
And step 205, sending the second HARQ message by using the selected component carrier with the minimum time delay. Thereafter, the subsequent flow of the present embodiment is not executed.
And step 206, when the current data is sent by the opposite end of the first HARQ message, selecting a member carrier with the first subframe ratio from the aggregated carriers according to whether the current data is correctly received, and sending an ACK/NACK message to the opposite end.
And if the first HARQ message is a NACK message and meets the preset data retransmission condition, selecting the member carrier wave which is the same as the member carrier wave for transmitting the previous data at the last time to retransmit the previous data. That is, when a NACK message fed back by the peer end is received, if the number of times of sending the previous data to the peer end does not reach the preset maximum retransmission number, the previous data is retransmitted to the peer end by using the same member carrier as that used for transmitting the previous data last time.
When a second member carrier which is in a complementary subframe ratio with a first member carrier for sending the first HARQ message does not exist in the communication system, the member carrier which has the same subframe ratio with the first member carrier for sending the first HARQ message is selected to send the ACK/NACK message, the member carrier which sends the previous data for the first time is selected to retransmit the previous data, and the HARQ timing relationship which is the same as that of LTE TDD can be adopted, so that the introduction of a complex HARQ timing relationship to the LTE-A TDD system is avoided. As shown in fig. 4, a schematic diagram of a radio frame structure of two component carriers is shown, in fig. 4, at the same time, the two component carriers are either uplink subframes or downlink subframes, and ACK/NACK messages are fed back on the component carrier having the same uplink and downlink subframe ratio as the component carrier transmitting the current data, so that the HARQ timing relationship is very simple. Based on the radio frame structure shown in fig. 4, the base station may transmit current data to the UE through the PDSCH at the subframe time shown in 301, the UE selects the subframe time shown in 302 according to whether the current data is correctly received, transmits an ACK/NACK message to the base station through a physical uplink ACK channel, and the base station retransmits the current data or transmits new data to the UE through the PDSCH at the subframe time shown in 303 according to the ACK/NACK message and a preset retransmission condition.
Further, in each HARQ communication method provided in the embodiments of the present invention, a relative timing relationship between component carriers having a complementary subframe matching ratio may be adjusted according to subframe distribution within a radio frame of the component carriers having the complementary subframe matching ratio, so that any two component carriers having the complementary subframe matching ratio have one component carrier as a downlink subframe and another component carrier as an uplink subframe at any time. Specifically, the relative timing relationship of the component carriers with the complementary subframe ratio may be adjusted by the following method: aligning the sub-frame time between the component carriers with complementary sub-frame matching in the aggregated carrier before selecting the component carrier with the minimum time delay; and then according to the complementary subframe ratio, introducing a subframe offset between the member carriers with the complementary subframe ratio, so that one member carrier is a downlink subframe and the other member carrier is an uplink subframe at any time in the member carriers with the complementary subframe ratio.
If there are L subframes in the radio frame of the component carrier with the complementary subframe ratio, where L is an integer greater than 1, the first subframe ratio is denoted as a DL: B UL, and the second subframe ratio is denoted as B DL: a UL, in general, L is equal to a + B or a multiple of a + B, that is: l ═ n (a + B), where n is an integer greater than or equal to 1, then introducing a subframe offset between component carriers with complementary subframe matching specifically is: introducing Bmod (A + B), or Bmod L or (A +2B) modL subframe offset between component carriers with complementary subframe ratios, and delaying a second component carrier by Bmod (A + B), or Bmod L or (A +2B) modL subframe time compared with a radio frame of a first component carrier, wherein Bmod (A + B) represents a modulus operation of B on (A + B), Bmod L represents a modulus operation of B on L, and (A +2B) modL represents a modulus operation of (A +2B) on L.
For example: one radio frame is composed of 10 subframes, which are respectively marked as subframes 0 to 9, wherein subframe 0 is the beginning of the radio frame, according to the above relative timing relationship adjustment method of the above embodiment of the present invention, as long as the radio frame of the component carrier whose uplink and downlink subframe ratio is 2 DL: 3UL is delayed by 2 or 7 subframes relative to the radio frame of the component carrier whose uplink and downlink subframe ratio is 3 DL: 2UL, one component carrier can be a downlink subframe and the other component carrier can be an uplink subframe at any time. As shown in fig. 5, which is a schematic view of a radio frame structure after the relative timing relationship is adjusted in the present invention, in fig. 5, a radio frame of a component carrier with an uplink/downlink subframe ratio of 2 DL: 3UL is delayed by 2 subframes with respect to a radio frame of a component carrier with an uplink/downlink subframe ratio of 3 DL: 2 UL. As shown in fig. 6, which is another schematic diagram of the radio frame structure after the relative timing relationship is adjusted in the present invention, in fig. 6, the radio frame of the component carrier with the uplink and downlink sub-frame ratio of 2 DL: 3UL is delayed by 7 sub-frames with respect to the radio frame of the component carrier with the uplink and downlink sub-frame ratio of 3 DL: 2 UL.
After the relative timing relation of any two member carriers with the complementary subframe ratio is adjusted, according to the first HARQ message, when the member carrier with the minimum time delay is selected to feed back the second HARQ message to the opposite terminal, because one member carrier is a downlink sub-carrier at any timeThe frame and the other component carrier is an uplink sub-frame, so there is always
The HARQ timing relationship is simple, and the same minimum HARQ RTT time delay as that of the FDD system is achieved. Let T0-T1-4 ms, i.e.: 4 subframes long, a schematic diagram of a time when the HARQ message is transmitted based on the frame structure shown in fig. 4, as shown in fig. 7. If for the current data transmitted by the base station on the PDSCH, if the UE still transmits ACK/NACK information on the member carrier with the ratio of uplink sub-frame to downlink sub-frame being 3 DL: 2UL, the base station still retransmits the current data or transmits new data on the member carrier with the ratio of uplink sub-frame to downlink sub-frame being 3 DL: 2UL, the HARQ RTT is 11 ms. As can be seen from fig. 7, any two component carriers with complementary subframe ratios are used to transmit current data, ACK/NACK message, retransmit current data, or transmit new data, for example: when the current data, the ACK/NACK message, the retransmission current data, or the new data is transmitted at the sub-frame times shown in 401, 402, and 403, respectively, the HARQ RTT is reduced to 8ms, which is 3ms less than the previous 11 ms.
Fig. 8 is a schematic structural diagram of an HARQ communication apparatus according to an embodiment of the present invention, where the HARQ communication apparatus according to the embodiment may be used to implement the HARQ communication method according to each of the above embodiments of the present invention. As shown in fig. 8, the HARQ communication apparatus of this embodiment includes a receiving module 501, a selecting module 502, and a transmitting module 503. The receiving module 501 is configured to receive a first HARQ message. The selecting module 502 is configured to, after the receiving module 501 receives the first HARQ message, select a component carrier with the minimum time delay from the N component carriers that are available for sending the second HARQ message according to the time delay between the first HARQ message and the second HARQ message of the N component carriers that are available for sending the second HARQ message in the aggregated carriers. The first HARQ message is current data, and correspondingly, the second HARQ message is an ACK/NACK message; or, the first HARQ message is an ACK/NACK message, and correspondingly, the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data. The sending module 503 is configured to send the second HARQ message by using the component carrier with the minimum delay selected by the selecting module 502.
Fig. 9 is a schematic structural diagram of another embodiment of the HARQ communication apparatus of the present invention, and compared with the HARQ communication apparatus of the embodiment shown in fig. 8, the HARQ communication apparatus of this embodiment further includes a storage module 504 and a first obtaining module 505. The storage module 504 is configured to store the HARQ timing relationship between the uplink subframe and the downlink subframe of the N component carriers. The first obtaining module 505 is configured to obtain HARQ timing relationships in the uplink and downlink subframe ratios of the N component carriers from the storage module 504, and obtain a time delay between the first HARQ message and the second HARQ message of the N component carriers according to the HARQ timing relationships. Correspondingly, the selecting module 502 selects the component carrier with the minimum time delay from the N component carriers available for sending the second HARQ message according to the time delay between the first HARQ message and the second HARQ message of the N component carriers acquired by the first acquiring module 505.
When the aggregated carrier includes component carriers with complementary subframe configurations, as shown in fig. 10, which is a schematic structural diagram of another embodiment of the HARQ communication apparatus of the present invention, compared with the embodiment shown in fig. 8 or fig. 9, in this embodiment, the HARQ communication apparatus further includes a second obtaining module 506 and an inquiring module 507. The second obtaining module 506 is configured to obtain, after the receiving module 501 receives the first HARQ message, a first subframe ratio of a first component carrier that sends the first HARQ message. The querying module 507 is configured to query whether a second component carrier with a second subframe ratio exists in the aggregated carriers, where the second subframe ratio and the first subframe ratio acquired by the second acquiring module 506 are complementary subframe ratios, and the first component carrier and the second component carrier form a component carrier with a complementary subframe ratio. Correspondingly, the selecting module 502 specifically selects, according to the query result of the querying module 507, when there are N component carriers with complementary subframe ratios, a component carrier with the smallest time delay from the component carriers with complementary subframe ratios according to the time delay between the first HARQ message and the second HARQ message of the N component carriers with complementary subframe ratios; when a second component carrier exists, the second component carrier is directly used as the second component carrier with the minimum time delay.
If the HARQ communication apparatus shown in fig. 10 further includes a storage module 504 and a first obtaining module 505, the first obtaining module 505 obtains the HARQ timing relationship at the second subframe ratio, which is queried by the querying module 507, from the storage module 504, and obtains the time delay between the first HARQ message and the second HARQ message of the component carrier having the second subframe ratio according to the HARQ timing relationship. Correspondingly, the selecting module 502 selects the component carrier with the minimum time delay from the N component carriers available for sending the second HARQ message according to the time delay between the first HARQ message and the second HARQ message of the N component carriers acquired by the first acquiring module 505.
Fig. 11 is a schematic structural diagram of a HARQ communication apparatus according to still another embodiment of the present invention, and compared with the embodiment shown in fig. 10, the HARQ communication apparatus of this embodiment further includes a first adjusting module 508 and a second adjusting module 509. The first adjusting module 508 is configured to align subframe moments between the component carriers with complementary subframe ratios in the aggregated carrier according to the query result of the querying module 507. The second adjusting module 509 is configured to introduce a subframe offset between the component carriers with the complementary subframe matching according to the complementary subframe matching after the first adjusting module 508 aligns the subframe time between the component carriers with the complementary subframe matching in the aggregated carrier, so that one component carrier is a downlink subframe and another component carrier is an uplink subframe at any time in the component carriers with the complementary subframe matching. Correspondingly, the selecting module 502 selects the component carrier with the minimum delay after the second adjusting module 509 introduces a subframe offset between the component carriers with the complementary subframe ratio.
Similarly, if the HARQ communication apparatus shown in fig. 11 further includes a storage module 504 and a first obtaining module 505, the first obtaining module 505 obtains, from the storage module 504, the HARQ timing relationship in the complementary subframe ratio after the second adjusting module 509 introduces one subframe offset, and obtains, according to the HARQ timing relationship, a time delay between the first HARQ message and the second HARQ message of the component carrier having the complementary subframe ratio. Correspondingly, the selecting module 502 selects the component carrier with the minimum time delay from the N component carriers available for sending the second HARQ message according to the time delay between the first HARQ message and the second HARQ message of the N component carriers acquired by the first acquiring module 505.
Further, in the HARQ communications apparatus according to the embodiment of the present invention, the selecting module 502 may be further configured to, according to the query result of the querying module 507, select a component carrier with a first subframe ratio from the aggregated carriers if the first HARQ message is current data when the second component carrier does not exist, and instruct the sending module 503 to send the ACK/NACK message using the component carrier with the first subframe ratio; if the first HARQ message is a NACK message and satisfies the predetermined data retransmission condition, the component carrier that is the same as the last data transmitted last time is selected, and the sending module 503 is instructed to retransmit the last data by using the component carrier that is the same as the last data transmitted last time.
An embodiment of the present invention further provides a UE including the HARQ communication apparatus provided in any embodiment of fig. 8 to 11 of the present invention.
An embodiment of the present invention further provides a base station, including the HARQ communication apparatus provided in any embodiment of fig. 8 to fig. 11 of the present invention.
In addition, an embodiment of the present invention further provides a communication system, which includes a UE and a base station, where one of the UE and the base station includes the HARQ communication apparatus provided in any one of fig. 8 to 11 of the present invention, or both the UE and the base station include the HARQ communication apparatus provided in any one of fig. 8 to 11 of the present invention.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
In the embodiment of the invention, in the HARQ process, when different member carriers in the aggregated carrier have different uplink and downlink subframe ratios, after the UE or the base station receives the first HARQ message, the member carrier with the minimum time delay between the first HARQ message and the second HARQ message is selected to send the second HARQ message, thereby effectively reducing the HARQ RTT and meeting the real-time service requirement;
further, in the embodiment of the present invention, when the aggregated carrier includes the component carrier with the complementary subframe ratio, the component carrier with the minimum time delay is selected from the component carriers with the complementary subframe ratio to transmit the second HARQ message, which has a simpler HARQ timing relationship, reduces the complexity of the TDD communication system, and further reduces the HARQ RTT.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not to be construed as limiting the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will understand that: modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention.
Claims (16)
1. A method for hybrid automatic repeat request communication, comprising:
receiving a first hybrid automatic repeat request (HARQ) message;
selecting a member carrier with the minimum time delay from N member carriers which can be used for sending a second HARQ message according to the time delay between a first HARQ message and the second HARQ message of the N member carriers which can be used for sending the second HARQ message in the aggregated carriers, wherein N is an integer larger than 1; the first HARQ message is current data, and the second HARQ message is an acknowledgement response message or a negative acknowledgement message ACK/NACK message, or the first HARQ message is an ACK/NACK message, and the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data;
and sending a second HARQ message by utilizing the member carrier with the minimum time delay.
2. The method of claim 1, wherein before the selecting the component carrier with the smallest delay, further comprising:
respectively acquiring preset HARQ timing relations under the uplink subframe ratio and the downlink subframe ratio of the N member carriers;
and acquiring the time delay between the first HARQ message and the second HARQ message of the N member carriers according to the HARQ timing relation of the N member carriers.
3. The method according to claim 1, wherein the receiving the first HARQ message specifically comprises: the user terminal UE receives the current data sent by the base station through a physical downlink shared channel PDSCH; the time delay between the first HARQ message and the second HARQ message is specifically: the uplink time which is closest to the time of receiving the first HARQ message is not less than the first preset constant time; the sending of the second HARQ message specifically includes: sending ACK/NACK information to a base station through a physical uplink ACK channel; or
The receiving the first HARQ message specifically includes: the base station receives the current data sent by the UE through a Physical Uplink Shared Channel (PUSCH); the time delay between the first HARQ message and the second HARQ message is specifically: the downlink time which is closest to the time of receiving the first HARQ message is not less than the first preset constant time; the sending of the second HARQ message specifically includes: sending ACK/NACK information to UE through a physical downlink ACK channel; or
The receiving the first HARQ message specifically includes: the UE receives an ACK/NACK message sent by a base station through a physical downlink ACK channel; the time delay between the first HARQ message and the second HARQ message is specifically: the uplink time which is not less than the nearest uplink time of the second preset constant time from the time of receiving the ACK/NACK message; the sending of the second HARQ message specifically includes: sending the previous data or the next data of the previous data corresponding to the ACK/NACK message to the base station through a PUSCH; or
The receiving the first HARQ message specifically includes: a base station receives an ACK/NACK message sent by UE through a physical uplink ACK channel; the time delay between the first HARQ message and the second HARQ message is specifically: the downlink time which is not less than the nearest downlink time of the second preset constant time from the time of receiving the ACK/NACK message; the sending of the second HARQ message specifically includes: and sending the last data or the next data of the last data corresponding to the ACK/NACK message to the UE through the PDSCH.
4. The method according to claim 1, wherein the selecting the component carrier with the smallest time delay from the N component carriers available for transmitting the second HARQ message is specifically: and if more than two member carriers with the minimum time delay exist in the N member carriers, selecting one member carrier with the minimum time delay from the more than two member carriers with the minimum time delay according to preset or information interaction between the UE and the base station.
5. The method according to any one of claims 1 to 4, wherein the aggregated carriers include component carriers with complementary subframe matching;
after receiving the first HARQ message, the method further includes: acquiring a first subframe ratio of a first member carrier for sending the first HARQ message; querying whether a second member carrier with a second subframe ratio exists in the aggregated carriers, wherein the second subframe ratio and the first subframe ratio are complementary subframe ratios, and the first member carrier and the second member carrier form a member carrier with a complementary subframe ratio;
selecting a component carrier with the minimum time delay from the N component carriers available for transmitting the second HARQ message according to the time delay between the first HARQ message and the second HARQ message of the N component carriers available for transmitting the second HARQ message comprises: and when N member carriers with complementary subframe matching exist, selecting the member carrier with the minimum time delay from the N member carriers with complementary subframe matching according to the time delay between the first HARQ message and the second HARQ message of the N member carriers with complementary subframe matching.
6. The method of claim 5, wherein before selecting a component carrier with a minimum delay from the N component carriers with complementary subframe matching, further comprising:
aligning the sub-frame time between member carriers with complementary sub-frame ratio in the aggregated carrier;
according to the complementary subframe ratio, a subframe offset is introduced between the member carriers with the complementary subframe ratio, so that one member carrier is a downlink subframe and the other member carrier is an uplink subframe at any time in the member carriers with the complementary subframe ratio.
7. The method of claim 6, wherein there are L subframes in the radio frame of the component carriers with complementary subframe matching, wherein L is an integer greater than 1;
the first subframe ratio is A DL to B UL, the second subframe ratio is B DL to A UL, wherein A, B are integers which are larger than or equal to zero respectively, A, B is not zero at the same time, L is n (A + B), n is an integer which is larger than or equal to 1, UL is an uplink subframe, and DL is a downlink subframe;
introducing a subframe offset between the component carriers with complementary subframe matching specifically comprises: introducing Bmod (A + B), or Bmod L or (A +2B) mod L subframe offset between component carriers with complementary subframe ratio, and delaying the second component carrier by Bmod (A + B), or Bmod L or (A +2B) mod L subframe time than the wireless frame of the first component carrier, wherein Bmod (A + B) represents the modulus operation of B to (A + B).
8. The method of claim 5, further comprising:
when a second component carrier does not exist, if the first HARQ message is current data, selecting a component carrier with a first subframe ratio from the aggregation carrier to send the ACK/NACK message; and if the first HARQ message is a NACK message and meets a preset data retransmission condition, selecting the same member carrier as the last data transmitted last time to retransmit the last data.
9. A hybrid automatic repeat request communication apparatus, comprising:
a receiving module, configured to receive a first HARQ message;
a selecting module, configured to select, according to a time delay between a first HARQ message and a second HARQ message of N component carriers that are available to send a second HARQ message in an aggregated carrier, a component carrier with a minimum time delay from the N component carriers that are available to send the second HARQ message; the first HARQ message is current data, and the second HARQ message is an ACK/NACK message, or the first HARQ message is an ACK/NACK message, and the second HARQ message is previous data corresponding to the ACK/NACK message or next data of the previous data;
and a sending module, configured to send a second HARQ message using the component carrier with the minimum time delay.
10. The apparatus of claim 9, further comprising:
a storage module, configured to store the HARQ timing relationship in the uplink and downlink subframe ratios of the N component carriers;
a first obtaining module, configured to obtain, from the storage module, HARQ timing relationships in the uplink and downlink subframe ratios of the N component carriers, respectively, and obtain, according to the HARQ timing relationships, a time delay between a first HARQ message and a second HARQ message of the N component carriers.
11. The apparatus according to claim 9 or 10, wherein the aggregated carriers include component carriers with complementary subframe matching;
the device further comprises:
a second obtaining module, configured to obtain a first subframe ratio of a first component carrier that sends the first HARQ message;
the query module is used for querying whether a second member carrier with a second subframe ratio exists in the aggregated carriers, the second subframe ratio and the first subframe ratio are complementary subframe ratios, and the first member carrier and the second member carrier form a member carrier with a complementary subframe ratio;
the selection module selects a component carrier with the minimum time delay from the N component carriers with the complementary subframe ratio according to the time delay between the first HARQ message and the second HARQ message of the N component carriers with the complementary subframe ratio when the N component carriers with the complementary subframe ratio exist according to the query result of the query module.
12. The apparatus of claim 11, further comprising:
a first adjusting module, configured to align subframe moments between component carriers with complementary subframe ratios in the aggregated carrier according to a query result of the querying module;
a second adjusting module, configured to introduce a subframe offset between component carriers with complementary subframe ratios according to the complementary subframe ratios after the first adjusting module aligns subframe moments between the component carriers with complementary subframe ratios in the aggregated carriers, so that one component carrier is a downlink subframe and another component carrier is an uplink subframe at any time in the component carriers with complementary subframe ratios;
the selection module selects the component carrier with the minimum time delay after introducing a subframe offset between the component carriers with the complementary subframe ratio in the second adjustment module.
13. The apparatus of claim 12, wherein the selecting module is further configured to select a component carrier with a first subframe ratio from the aggregated carriers if the first HARQ message is current data according to the query result of the querying module, and instruct the sending module to send the ACK/NACK message on the component carrier with the first subframe ratio; and if the first HARQ message is a NACK message and meets a preset data retransmission condition, selecting the member carrier wave which is the same as the member carrier wave for transmitting the previous data last time, and indicating the transmitting module to retransmit the previous data by the member carrier wave which is the same as the member carrier wave for transmitting the previous data last time.
14. A user terminal comprising the hybrid automatic repeat request communication device according to any of claims 9 to 13.
15. A base station comprising a hybrid automatic repeat request communication device according to any of claims 9 to 13.
16. A communication system comprising a user terminal and a base station, wherein the hybrid automatic repeat request communication apparatus according to any of claims 9 to 13 is comprised in the user terminal and/or the base station.
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