CN101772073A - Method and device for realizing hybrid automatic repeat request based on time division duplex system - Google Patents
Method and device for realizing hybrid automatic repeat request based on time division duplex system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
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Abstract
The invention discloses a method and a device for realizing a hybrid automatic repeat request (HARQ) based on a time division duplex system. In the method, a base station determines the retransmission interval of an HARQ processes according to predetermined information and a service demand, wherein the retransmission interval is integral multiple the duration of a radio frame, and the predetermined information comprises the amount ratio of uplink frames and downlink frames in the radio frame, the distribution of control channels and uplink/downlink processing time delay. By adopting the technical scheme, aiming at different HARQ processes, the retransmission time delay can be flexibly processed by setting the retransmission interval of the HARQ processes to be integral multiple the duration of the radio frame and updating the retransmission interval according to the resource allocation condition, thereby the flexibility of the HARQ process is improved.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of implementation method and device of the automatic repeat requests of mixing based on tdd systems.
Background technology
Mix automatic repeat requests (Hybrid Automatic Retransmission Request, abbreviate HARQ as) be a kind of the change when overcoming wireless mobile channel and technology that influence that multipath fading transmits signal proposes, this technology is passed through automatic repeat requests (AutomaticRetransmission Request, abbreviate ARQ as) and two kinds of technical tie-ups of forward error correction coding (ForwardError Correction abbreviates FEC as) make and be used for realizing.And, the HARQ technology is third generation partner program (3rd Generation PartnershipProject, abbreviate 3GPP as) Long Term Evolution (Long Term Evolution, one of abbreviate LTE as) key technology of system, this technology can make mobile radio system obtain the higher throughput of system and the stability of a system of Geng Gao.
The HARQ technology combines ARQ with FEC, when transmit leg sends packet, in each packet, carry the check bit of error correction and error detection, the recipient receives and resolves the packet from transmit leg, if the packet that receives make mistakes bit number within the error correcting capability of FEC, then mistake can be corrected voluntarily by FEC, does not need to use the HARQ technology; If mistake is more serious, that is, the Bit data of makeing mistakes of the packet that receives has exceeded the error correcting capability of FEC, and then by the NACK feedback, the notice transmit leg resends this error data bag.Like this, the recipient can obtain extra snr gain, and can obtain the time diversity effect by a plurality of samples that receive are merged, thereby improves the throughput and the performance of system.
At TDD OFDM (Time Division Duplex-OrthogonalFrequency Division Multiplexing, abbreviate TDD-OFDM as) in the system, up, descending is the timesharing transmission, base station and terminal receive data all needs certain processing time, can increase the processing delay of data like this, in addition, frame alignment and propagation also can cause certain time delay.In order to reduce time division duplex (Time Division Duplex, abbreviate TDD as) the intrinsic time delay of system, the TDD system is divided into several littler subframes (Sub-Frame) with radio frames (Radio Frame) usually, the ratio data of descending sub frame and sub-frame of uplink can be determined according to concrete performance, wherein, the duration of a subframe is called 1 Transmission Time Interval (Transmit Time Interval abbreviates TTI as).For example, in the wireless frame structure shown in Figure 1, a radio frames is divided into 8 subframe: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, wherein, SF0, SF1, SF2 are sub-frame of uplink (UL), SF3, SF4, SF5, SF6, SF7 are descending sub frame (DL), and promptly the ratio of the quantity of UL/DL is 3: 5.And, two up-downgoing switching points are arranged in the radio frames, in the radio frames as shown in Figure 2, there is a up-downgoing switching point between SF2 and the SF3, there is a up-downgoing switching point between first subframe of SF7 and next radio frames.
Because there is processing delay in the TDD system, the base station needs through processing delay ability feeding back ACK (affirmative acknowledgement/correctly reply) or NACK (negative response/wrong responses) information after receiving data; Simultaneously, terminal also will be through behind certain processing delay after receiving the feedback information of base station, transmits when possessing the transmission condition or retransmits.At present, in the synchronous HARQ technology, for each HARQ process, the moment of its re-transmission is all fixed, but can there be following shortcoming in the fixing method of this retransmission time:
1) disposal ability to equipment has fixing requirement, can not support the terminal of different disposal ability simultaneously.For example, behind the system upgrade, can new requirement be arranged to the processing speed of terminal, like this, can limit the access that causes the big terminal of processing delay because of processing speed is low.
2) tenability of incompatibility multi-service characteristics, for example, real time business and non-real-time service require retransmission delay time inequality, and system does not allow different business that different retransmission delay times is not arranged according to business features.
3) can not handle flexibly the conflict that takes place in the data transmission procedure, for example, when system and other system were compatible, if the ascending resource of this system is taken by other system, can cause just passing data or data retransmission can not send on predetermined ascending resource.
At present, the limiting terminal that fixedly causes at retransmission time in the correlation technique inserts, the tenability of incompatibility multi-service characteristics, and the problem that can not handle the transfer resource conflict, does not propose effective solution as yet.
Summary of the invention
Consider that the limiting terminal that the retransmission time that exists in the correlation technique fixedly causes inserts, the tenability of incompatibility multi-service characteristics, and can not handle the problem of transfer resource conflict and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of implementation method and device of the automatic repeat requests of mixing based on tdd systems, to address the above problem.
A kind of implementation method of the automatic repeat requests of mixing based on tdd systems is provided according to an aspect of the present invention.
Implementation method according to the automatic repeat requests of mixing based on tdd systems of the present invention comprises: the retransmit interval of HARQ process is determined in the base station according to predetermined information and business demand, wherein, retransmit interval is the integral multiple of a radio frames duration, and predetermined information comprises: the distribution of the ratio of the quantity of sub-frame of uplink and descending sub frame, control channel in the radio frames, on/descending processing delay.
Wherein, predetermined information can also comprise: the time delay of terminal processes data, at this moment, determine that the operation of retransmit interval of the HARQ process of terminal comprises: the time delay of terminal processes data and the corresponding relation of terminal grade are set, wherein, each terminal grade corresponds respectively to corresponding preset time delay scope; The corresponding relation of terminal grade and retransmit interval is set; Determine the retransmit interval of the HARQ process of terminal according to the time delay of terminal processes data.
Wherein, business demand is professional real-time requirement to retransmit interval.
Further, said method also comprises: in the HARQ process, retransmit interval is upgraded in the base station.
Preferably, after retransmit interval was upgraded in the base station, said method also comprised: the base station one of in the following manner sends the retransmit interval of upgrading to terminal in control channel: broadcast mode, multicast mode, mode of unicast.
Wherein, it is one of following that retransmit interval comprises: terminal carry out the first biography of packet and packet carried out retransmitting for the first time between the time interval, terminal packet is carried out the n time re-transmission and packet is carried out time interval between (n+1) inferior re-transmission, wherein, n is the natural number more than or equal to 1.
Wherein, a HARQ process comprises: the first biography, base station that terminal is carried out packet is to the re-transmission to packet of the feedback of the packet that receives and/or terminal, and each HARQ process takies the one or more sub-frame of uplink in the radio frames.
According to another aspect of the present invention, provide a kind of implement device of the automatic repeat requests of mixing based on tdd systems, this device can be positioned at base station side.
The implement device based on the automatic repeat requests of mixing of tdd systems according to the embodiment of the invention comprises: determination module, be used for determining the retransmit interval of HARQ process according to predetermined information, wherein, retransmit interval is the integral multiple of a radio frames duration, and predetermined information comprises: the distribution of the ratio of the quantity of sub-frame of uplink and descending sub frame, control channel in the radio frames, on/descending processing delay; Update module is used for the process at HARQ, upgrades retransmit interval.
By above-mentioned at least one technical scheme of the present invention, at different HARQ processes, be set to the integral multiple of a radio frames duration by the retransmit interval of HARQ process, and according to the resource distribution situation, upgrade retransmit interval, than prior art, can handle retransmission delay time flexibly, thereby improve the flexibility of HARQ process.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart based on the implementation method of the automatic repeat requests of mixing of tdd systems according to correlation technique;
Fig. 2 is the structural representation according to the radio frames of the TDD-OFDMA system of correlation technique;
Fig. 3 is the flow chart based on the implementation method of the automatic repeat requests of mixing of tdd systems according to the embodiment of the invention;
Fig. 4 carries out the capability negotiation process according to embodiment of the invention base station and terminal.
Fig. 5 is the schematic diagram according to the embodiment 1 of method shown in Figure 3;
Fig. 6 is the schematic diagram according to the embodiment 2 of method shown in Figure 3;
Fig. 7 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 2: 6 HARQ timing mechanism;
Fig. 8 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 3: 5 HARQ timing mechanism;
Fig. 9 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 4: 4 HARQ timing mechanism;
Figure 10 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 5: 3 HARQ timing mechanism;
Figure 11 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 6: 2 HARQ timing mechanism;
Figure 12 is the structured flowchart based on the implement device of the automatic repeat requests of mixing of tdd systems according to the embodiment of the invention.
Embodiment
Functional overview
As mentioned above, at the problems referred to above that exist in the synchronous HARQ technology based on the TDD system, the present invention proposes a kind of improved sync retransmission mechanism, in technical scheme of the present invention, the base station can be according to the allocation ratio of sub-frame of uplink in the radio frames and descending sub frame, the distribution and the up-downgoing processing delay of control channel, determine the retransmit interval of the HARQ process of terminal, and, the base station retransmit interval is set to the integral multiple of a radio frames duration, terminal is carried out the re-transmission of data according to this retransmit interval; In the HARQ process, this retransmit interval can also be upgraded according to the resource distribution situation of radio frames in the base station.Method provided by the invention can be handled retransmission delay time flexibly, has improved the flexibility of HARQ process.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
For the ease of understanding, before the embodiment of the invention is described, at first the implementation method of the automatic repeat requests of up mixing in the correlation technique is carried out concise and to the point description in conjunction with Fig. 1.Wherein, synchronous HARQ is meant that the transmission (re-transmission) of a HARQ process occurs in fixed time, since receiving terminal moment of known transmission in advance, the moment that does not therefore need extra signaling consumption indication to retransmit.
Step S201, the base station is by the ascending resource of the control signaling on the down control channel to terminal distribution transmission data, and terminal sends just biography data or data retransmission to the base station on the resource of the sub-frame of uplink that is distributed, beginning HARQ process;
Step S202, the base station receives the first biography data or the data retransmission of self terminal, and in the corresponding downstream control channel feedback information is sent to terminal, if feedback information is to deny information, proceeds to step S203; If feedback information is confirmation (ACK), enter into step S204;
Step S203, terminal receives nack message, whether judgement reaches maximum retransmission to the re-transmission of data, if reach number of retransmissions, enter into step S204, otherwise terminal is under the retransmit interval of HARQ process regulation requires, on corresponding sub-frame of uplink, carry out data retransmission, and enter into step S201;
Step S204, terminal stops the HARQ process.
Method embodiment
According to the embodiment of the invention, provide a kind of implementation method of the automatic repeat requests of mixing based on tdd systems.
Fig. 3 is the flow chart based on the implementation method of the automatic repeat requests of mixing of tdd systems according to the embodiment of the invention, need to prove, for convenience of description, in Fig. 3, illustrated and described the technical scheme of method embodiment of the present invention, can in computer system, carry out such as a set of computer-executable instructions in the step shown in Fig. 3 with the form of step.Though figure 3 illustrates logical order, in some cases, can carry out step shown or that describe with the order that is different from herein.As shown in Figure 3, this method may further comprise the steps (step S302 is to step S304).
Step S302, the retransmit interval of HARQ process is determined in the base station according to predetermined information and business demand, wherein, retransmit interval is the integral multiple of a radio frames duration, and predetermined information comprises: the distribution of the ratio of the quantity of sub-frame of uplink and descending sub frame, control channel in the radio frames, on/descending processing delay;
Wherein, each HARQ process takies the one or more sub-frame of uplink in the radio frames, and each HARQ process comprises: terminal is carried out the first biography of packet, the base station is to the feedback of the packet of reception, and/or terminal is to the re-transmission of packet, feed back correct response feedback or wrong responses feedback, if be fed back to correct response feedback, then the HARQ process is that terminal is carried out the first biography of packet and the base station feedback to the packet that receives, if be fed back to correct response feedback, then terminal is carried out the first biography of packet, the base station is to the re-transmission to packet of the feedback of the packet that receives and terminal; It is one of following that this retransmit interval comprises: terminal carry out the first biography of packet and packet carried out retransmitting for the first time between the time interval, terminal packet is carried out the n time re-transmission and packet is carried out time interval between (n+1) inferior re-transmission, wherein, n is the natural number more than or equal to 1.
Need to prove, in different communication systems, the duration of radio frames may be different, for example, in the LTE system, the duration of a radio frames is 10ms, but in the WIMAX system, the duration of a radio frames is 5ms, is directed to different system, and the HARQ process can have different retransmit intervals.
Step S304, in the HARQ process, retransmit interval can be upgraded according to the configuring condition of resource in the radio frames in the base station, afterwards, the base station one of in the following manner sends the retransmit interval of upgrading to terminal in control channel: broadcast mode, multicast mode, mode of unicast.
The technical scheme that provides by the embodiment of the invention, at different HARQ processes, be set to the integral multiple of a radio frames duration by the retransmit interval of HARQ process, and according to the resource distribution situation, upgrade retransmit interval, than prior art, can handle retransmission delay time flexibly, thereby improve the flexibility of HARQ process.
In concrete processing procedure, the time delay size that can also comprise the terminal processes data in the above-mentioned predetermined information, the base station is according to the time delay size of terminal processes data, determine the retransmit interval of the HARQ process of terminal, concrete operations are: the time delay of terminal processes data and the corresponding relation of terminal grade are set, make each terminal grade correspond respectively to corresponding preset time delay scope; The corresponding relation of terminal grade and retransmit interval is set; Treatment principle can for: the time delay of terminal processes data is big more, and the grade of this terminal is low more, and the retransmit interval of terminal correspondence is big more, and on the contrary, the time delay of terminal processes data is more little, and the grade of this terminal is high more, and the retransmit interval of terminal correspondence is more little.Like this, the base station at different terminals, is set different retransmit intervals according to the speed or the ability of the deal with data of terminal, just can support the user of different disposal speed ability, thereby has improved the flexibility of HARQ process.
In addition, above-mentioned business demand is mainly professional real-time requirement to retransmit interval, and the base station is according to the real-time of business, determine the retransmit interval of professional HARQ process, for example, for the demanding business of real-time, the base station can be dispatched it and be transmitted on the short HARQ process of retransmit interval; For non-real-time service, dispatch it and on the long HARQ process of retransmit interval, transmit, promptly Ye Wu real-time is high more, and the retransmit interval of this business correspondence is more little, and on the contrary, professional real-time is low more, and the retransmit interval of this business correspondence is big more.Like this, the base station at different business, is provided with different retransmit intervals according to the real-time of business, thereby has improved the flexibility of HARQ process.
Fig. 4 has described the handling process of holding consultation according to the terminal of the embodiment of the invention and base station, as shown in Figure 4, comprises following processing (step S401 is to step S404).
Step S401, base station and terminal are carried out basic capability negotiating, know the processing delay grade of this terminal, according to the processing delay grade of this terminal, determine the HARQ process retransmit interval of terminal;
Step S402, the base station judges according to the grade of terminal whether terminal supports the retransmit interval of 5ms, if judged result enters into step S404 for being, otherwise, enter into step S403;
Step S403, the base station is defined as 10ms with the retransmit interval of terminal, and flow process finishes;
Step S404, the base station is defined as 5ms and/or 10ms with the retransmit interval of terminal, and flow process finishes.
Below in conjunction with accompanying drawing 5 and Fig. 6 the implementation method of the automatic repeat requests of mixing based on tdd systems provided by the invention is described in detail.
When terminal networked, the base station was to the processing method of HARQ retransmit interval
When terminal networked, the processing delay grade of this terminal was known by carrying out basic capability negotiating with terminal in the base station, according to the processing delay grade of this terminal, determined the HARQ process retransmit interval of terminal.For example, under frame structure shown in Figure 2, retransmit interval can comprise 5ms, 10ms etc., and wherein, the concrete handling process that base station and terminal are held consultation repeats no more as shown in Figure 4 here.
For the terminal of supporting the 5ms retransmission delay time, the uplink transmission data of this terminal of base station scheduling, terminal send on the HARQ process that with 5ms is retransmit interval and just pass data or data retransmission; For the terminal of supporting the 10ms retransmission delay time, the uplink transmission data of this terminal of base station scheduling, terminal send on the HARQ process that with 10ms is retransmit interval and just pass data or data retransmission.
In addition, for the terminal of supporting the 5ms retransmission delay time, the uplink transmission data of this terminal also can be dispatched in the base station, and terminal is sending just biography data or data retransmission on the HARQ process that with 5ms is retransmission delay time.
As shown in Figure 5, a superframe is made up of the radio frames of 4 5ms, and each radio frames comprises 3 sub-frame of uplink and 5 descending sub frames, and SF0, SF1, SF2 are sub-frame of uplink, and SF3, SF4, SF5, SF6, SF7 are descending sub frame.Wherein, one or more sub-frame of uplink can constitute an ascending HARQ course, and for example the HARQ process 1,2, and 3,4.Suppose the retransmit interval of terminal 1 support 5ms, terminal 2 is only supported the 10ms retransmit interval.As shown in Figure 5, base station scheduling terminal 1 is in the first biography and the re-transmission of HARQ process 1 and HARQ process 2 enterprising line data, carry out the ACK/NACK feedback on down control channel 2,5,8,11, then the retransmit interval of HARQ process is the time span of a radio frames, i.e. 5ms; Base station scheduling terminal 2 is carried out the ACK/NACK feedback in the first biography and the re-transmission of HARQ process 3 or HARQ process 4 enterprising line data on down control channel 3,6,9,12, then the retransmit interval of HARQ process is the time span of two radio frames, i.e. 10ms.
The method of retransmit interval is upgraded in the base station
As shown in Figure 6, the base station is according to the configuration and the transmission situation of resource in the radio frames, dispatch terminal 1 is in the first biography and the re-transmission of HARQ process 1 and HARQ process 2 enterprising line data, that retransmit for the 1st time is 5ms at interval, that retransmit for the 2nd time is 10ms at interval, wherein, the base station is by the variation of notice terminal 1 its retransmit interval in control channel 5, and, the base station one of can be in the following manner in control channel 5 sends the described retransmit interval of upgrading to described terminal: broadcast mode, the multicast mode, mode of unicast, table 1 is the message format that base station its retransmit interval of notice terminal changes, like this, the resource conflict problem in the uplink burst business can be handled by upgrading retransmit interval in the base station.
Table 1
| Title | Size | The value explanation |
| The synchronous HARQ retransmit interval changes | ||
| ??{ | ||
| The HARQ process number | ??Xbit | The HARQ process number |
| The retransmit interval value | ??1bit | 0: retransmit interval is 5ms 1: retransmit interval is 10ms |
| ??} |
The method of the retransmit interval of HARQ process is determined in the base station according to configuration, the control channel of last/descending sub frame
In a superframe, comprise 32 subframes, SF0 to SF31 carries out the order label to each ascending HARQ course respectively, and each down control channel is carried out label; Set up the control channel of ascending HARQ course, transmitting feedback information, the corresponding relation between the retransmit interval three.Wherein, the HARQ process is represented the label of ascending HARQ course, and an ascending HARQ course can comprise a subframe or a plurality of continuous subframe; Control channel is meant the control channel of the ACK/NACK of base station feedback, and the label of HARQ process and the label of control channel carry out the order label in the superframe scope.
Fig. 7 to Figure 11 has described the HARQ timing mechanism under the situation of different up-downgoing ratios, at different HARQ timing mechanisms, sets up different corresponding relations, below this is specifically described.
Fig. 7 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 2: 6 HARQ timing mechanism, shown in Figure 7, a radio frames is divided into 8 subframe: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, wherein, SF0, SF1 are sub-frame of uplink (UL), SF2, SF3, SF4, SF5, SF6, SF7 are descending sub frame (DL), and promptly the ratio of the quantity of UL/DL is 2: 6.And, there is a up-downgoing switching point between SF1 and the SF2, there is a up-downgoing switching point between first subframe of SF7 and next radio frames, and, suppose that the up-downgoing processing delay is the time span of 2 subframes.
According to HARQ timing mechanism schematic diagram shown in Figure 7, table 2 is based on the corresponding relation of HARQ timing mechanism shown in Figure 7, as shown in table 2 below, the HARQ process number is that the control channel sequence number of 1 HARQ process correspondence is 2, retransmit interval is 5ms, the HARQ process number is that the retransmit interval of 2 HARQ process is 5ms, and the feedback information of this HARQ process is to transmit on 2 the control channel in the control channel sequence number, be the corresponding identical retransmit interval of different HARQ process, and on identical control channel transmitting feedback information.
Table 2
| The HARQ process number | Control channel | Retransmit interval |
| ??1 | ??2 | ??5ms |
| ??2 | ??2 | ??5ms |
Fig. 8 is that the DL/UL according to the embodiment of the invention is the schematic diagram of 5: 3 HARQ timing mechanism, as shown in Figure 8, a radio frames is divided into 8 subframe: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, wherein, SF0, SF1, SF2, SF3, SF4 are up (Up Link abbreviates UL as) subframe, and SF5, SF6, SF7 are descending (Down Link, abbreviate DL as) subframe, promptly the ratio of the quantity of UL/DL is 3: 5.And, there is a up-downgoing switching point between SF4 and the SF5, there is a up-downgoing switching point between first subframe of SF7 and next radio frames.
According to HARQ timing mechanism schematic diagram shown in Figure 8, table 3 is based on the corresponding relation of HARQ timing mechanism shown in Figure 8, as shown in table 3 below, the HARQ process number is that the retransmit interval of 1 HARQ process correspondence is 5ms, and the feedback information of this HARQ process is respectively in the control channel sequence number on 2,5,8,11 the control channel and transmits; The HARQ process number is that the retransmit interval of 2 HARQ process is 5ms, and the feedback information of this HARQ process is respectively in the control channel sequence number on 2,5,8,11 the control channel and transmits, be the corresponding identical retransmit interval of different HARQ process, and on identical control channel transmitting feedback information.
The HARQ process number is that the retransmit interval of 3 HARQ process correspondence is 10ms, and the feedback information of this HARQ process is respectively in the control channel sequence number on 3,9 the control channel and transmits; The HARQ process number is that the retransmit interval of 4 HARQ process is 10ms, and the feedback information of this HARQ process is respectively in the control channel sequence number on 6,12 the control channel and transmits, be the corresponding identical retransmit interval of different HARQ process, but on different control channels transmitting feedback information.
Table 3
| The HARQ process | Control channel | Retransmit interval |
| ??1 | ??2，5，8，11 | ??5ms |
| ??2 | ??2，5，8，11 | ??5ms |
| ??3 | ??3，9 | ??10ms |
| ??4 | ??6，12 | ??10ms |
Fig. 9 is that the DL/UL according to the embodiment of the invention is the schematic diagram of 4: 4 HARQ timing mechanism, as shown in Figure 9, a radio frames is divided into 8 subframe: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, wherein, SF0, SF1, SF2, SF3 are sub-frame of uplink (UL), SF4, SF5, SF6, SF7 are descending sub frame (DL), and promptly the ratio of the quantity of UL/DL is 4: 4.And, there is a up-downgoing switching point between SF3 and the SF4, there is a up-downgoing switching point between first subframe of SF7 and next radio frames.
According to HARQ timing mechanism schematic diagram shown in Figure 9, table 4 is based on the corresponding relation of HARQ timing mechanism shown in Figure 9, as shown in table 4 below, the HARQ process number is that the retransmit interval of 1 and 2 HARQ process correspondence is equal 10ms, and the feedback information of these two processes is respectively in the control channel sequence number on 2,6 the control channel and transmits; The HARQ process number is that the retransmit interval of 3 and 4 HARQ process correspondence is equal 10ms, and the feedback information of these two processes is respectively in the control channel sequence number on 3,7 the control channel and transmits; The HARQ process number is that the retransmit interval of 5 and 6 HARQ process correspondence is equal 10ms, and the feedback information of these two processes is respectively in the control channel sequence number on 4,8 the control channel and transmits; The HARQ process number is that the retransmit interval of 7 and 8 HARQ process correspondence is equal 10ms, and the feedback information of these two processes is respectively in the control channel sequence number on 5,10 the control channel and transmits.
Table 4
| The HARQ process | Control channel | Retransmit interval |
| ??1 | 2,6 (the 2nd USCCH) | ??10ms |
| ??2 | ??2，6 | ??10ms |
| ??3 | ??3，7 | ??10ms |
| ??4 | ??3，7 | ??10ms |
| ??5 | ??4，8 | ??10ms |
| ??6 | ??4，8 | ??10ms |
| ??7 | ??5，(1) | ??10ms |
| ??8 | ??5，(1) | ??10ms |
Figure 10 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 3: 5 HARQ timing mechanism, as shown in figure 10, a radio frames is divided into 8 subframe: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, wherein, SF0, SF1, SF2 are sub-frame of uplink (UL), SF3, SF4, SF5, SF6, SF7 are descending sub frame (DL), and promptly the ratio of the quantity of UL/DL is 3: 5.And, two up-downgoing switching points are arranged in the radio frames, there is a up-downgoing switching point between SF2 and the SF3, there is a up-downgoing switching point between first subframe of SF7 and next radio frames.
According to HARQ timing mechanism schematic diagram shown in Figure 10, table 5 is based on the corresponding relation of HARQ timing mechanism shown in Figure 10, as shown in table 5 below, the HARQ process number is that the retransmit interval of 1,2,3 HARQ process correspondence is equal 5ms, and the feedback information of these three processes is respectively in the control channel sequence number on 1,3,5,7 the control channel and transmits; The HARQ process number is that the retransmit interval of 4 and 5 HARQ process correspondence is equal 5ms, and the feedback information of these two processes is respectively in the control channel sequence number on 2,4,6,8 the control channel and transmits.
Table 5
| The HARQ process | Control channel | Retransmit interval |
| ??1 | 1,3,5,7 (the 1st USCCH) | ??5ms |
| ??2 | 1,3,5,7 (the 1st USCCH) | ??5ms |
| ??3 | 1,3,5,7 (the 1st USCCH) | ??5ms |
| ??4 | ??2，4，6，8 | ??5ms |
| ??5 | ??2，4，6，8 | ??5ms |
Figure 11 is that the UL/DL according to the embodiment of the invention is the schematic diagram of 6: 2 HARQ mechanism.As shown in figure 11, a radio frames is divided into 8 subframe: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, and wherein, SF0, SF1, SF2, SF3, SF4, SF5 are sub-frame of uplink (UL), SF6, SF7 are descending sub frame (DL), and promptly the ratio of the quantity of UL/DL is 3: 5.And, there is a up-downgoing switching point between SF5 and the SF6, there is a up-downgoing switching point between first subframe of SF7 and next radio frames.
According to HARQ timing mechanism schematic diagram shown in Figure 11, table 6 is based on the corresponding relation of HARQ timing mechanism shown in Figure 11, as shown in table 6 below, the HARQ process number is that the retransmit interval of 1,2 HARQ process correspondence is equal 10ms, and the feedback information of these two processes is respectively in the control channel sequence number on 1,5 the control channel and transmits; The HARQ process number is that the retransmit interval of 3 HARQ process is 5ms, and the feedback information of this HARQ process is respectively in the control channel sequence number on 1,5 the control channel and transmits; The HARQ process number is that the retransmit interval of 4 and 5 HARQ process correspondence is equal 5ms, and the feedback information of these two processes is respectively in the control channel sequence number on 2,6 the control channel and transmits; The HARQ process number is that the retransmit interval of 6,7,8 HARQ process correspondence is equal 10ms, and the feedback information of these three processes is respectively in the control channel sequence number on 3,7 the control channel and transmits; The HARQ process number is that the retransmit interval of 9 HARQ process is 10ms, and the feedback information of this HARQ process is respectively 5 in the control channel sequence number, transmit on the control channel of (1), wherein, (1) represents the 1st control channel of the next radio frames adjacent with this radio frames.
Table 6
| The HARQ process | Control channel | Retransmit interval |
| ??1 | ??1，5 | ??10ms |
| ??2 | ??1，5 | ??10ms |
| ??3 | ??1，5 | ??5ms |
| The HARQ process | Control channel | Retransmit interval |
| ??4 | ??2，6 | ??5ms |
| ??5 | ??2，6 | ??5ms |
| ??6 | ??3，7 | ??10ms |
| ??7 | ??3，7 | ??10ms |
| ??8 | ??3，7 | ??10ms |
| ??9 | ??5，(1) | ??10ms |
Device embodiment
According to the embodiment of the invention, provide implement device based on the automatic repeat requests of mixing of tdd systems.
Figure 12 is the structured flowchart based on the implement device of the automatic repeat requests of mixing of tdd systems according to the embodiment of the invention, and this device can be positioned at base station side, as shown in figure 12, comprises determination module 10 and update module 20.
Update module 20 is used for the process at HARQ, upgrades retransmit interval.
Wherein, the HARQ process comprises: the first biography, base station that terminal is carried out packet is to the re-transmission to packet of the feedback of the packet that receives and/or terminal, feed back correct response feedback or wrong responses feedback, if be fed back to correct response feedback, then the HARQ process is that terminal is carried out the first biography of packet and the base station feedback to the packet that receives, if be fed back to correct response feedback, then the terminal first biography, base station of carrying out packet is to the re-transmission to packet of the feedback of the packet that receives and terminal; It is one of following that this retransmit interval comprises: terminal carry out the first biography of packet and packet carried out retransmitting for the first time between the time interval, terminal packet is carried out the n time re-transmission and packet is carried out time interval between (n+1) inferior re-transmission, wherein, n is the natural number more than or equal to 1.
By said apparatus of the present invention, at different HARQ processes, be set to the integral multiple of a radio frames duration by the retransmit interval of HARQ process, and according to the resource distribution situation, upgrade retransmit interval, than prior art, can handle retransmission delay time flexibly, thereby improve the flexibility of HARQ process.
As mentioned above, implementation method and device by means of the automatic repeat requests of mixing based on tdd systems provided by the invention, at different HARQ processes, be set to the integral multiple of a radio frames duration by the retransmit interval of HARQ process, and, upgrade retransmit interval, than prior art according to the resource distribution situation, can handle retransmission delay time flexibly, thereby improve the flexibility of HARQ process.And system supports the user of different disposal speed ability, and at its processing speed ability, sets different feedback delay; At different business characteristics, can realize that different business adopts different retransmission delay times; Handle the problem of uplink burst service conflict; Support many TTI scheduling.This method can be applied to tdd systems, for example, and the TDD-OFDM system.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the implementation method based on the automatic repeat requests of mixing of tdd systems is characterized in that, comprising:
The retransmit interval of HARQ process is determined in the base station according to predetermined information and business demand, wherein, described retransmit interval is the integral multiple of a radio frames duration, and described predetermined information comprises: the distribution of the ratio of the quantity of sub-frame of uplink and descending sub frame, control channel in the radio frames, on/descending processing delay.
2. method according to claim 1 is characterized in that, described predetermined information also comprises: the time delay of terminal processes data.
3. method according to claim 1 is characterized in that, described business demand is professional real-time requirement to described retransmit interval.
4. method according to claim 2 is characterized in that, the retransmit interval of the HARQ process of described definite described terminal comprises:
The time delay of described terminal processes data and the corresponding relation of terminal grade are set, and wherein, each terminal grade corresponds respectively to corresponding preset time delay scope;
The corresponding relation of terminal grade and retransmit interval is set;
Determine the retransmit interval of the HARQ process of described terminal according to the time delay of described terminal processes data.
5. according to each described method in the claim 1 to 4, it is characterized in that, also comprise:
In described HARQ process, retransmit interval is upgraded in described base station.
6. method according to claim 5 is characterized in that, described base station is upgraded after the retransmit interval, and described method also comprises:
Described base station one of in the following manner sends the described retransmit interval of upgrading to described terminal in control channel: broadcast mode, multicast mode, mode of unicast.
7. according to each described method in the claim 1 to 4, it is characterized in that, it is one of following that described retransmit interval comprises: terminal carry out the first biography of packet and described packet carried out retransmitting for the first time between the time interval, terminal described packet is carried out the n time re-transmission and described packet is carried out time interval between (n+1) inferior re-transmission, wherein, n is the natural number more than or equal to 1.
8. according to each described method in the claim 1 to 4, it is characterized in that described HARQ process comprises: the first biography, base station that terminal is carried out packet is to the re-transmission to described packet of the feedback of the described packet that receives and/or terminal.
9. according to each described method in the claim 1 to 4, it is characterized in that described HARQ process takies the one or more sub-frame of uplink in the described radio frames.
10. the implement device based on the automatic repeat requests of mixing of tdd systems is positioned at base station side, it is characterized in that described device comprises:
Determination module, be used for determining the retransmit interval of HARQ process according to predetermined information, wherein, described retransmit interval is the integral multiple of a radio frames duration, and described predetermined information comprises: the distribution of the ratio of the quantity of sub-frame of uplink and descending sub frame, control channel in the radio frames, on/descending processing delay;
Update module is used for upgrading described retransmit interval in described HARQ process.
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| CN200910003444A CN101772073A (en) | 2009-01-05 | 2009-01-05 | Method and device for realizing hybrid automatic repeat request based on time division duplex system |
| PCT/CN2009/074109 WO2010075706A1 (en) | 2009-01-05 | 2009-09-22 | Method and device for implementing hybrid automatic retransmission request (harq) based on time division duplex (tdd) system |
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