CN101826952A - Method for determining hybrid automatic repeat request feedback channel - Google Patents
Method for determining hybrid automatic repeat request feedback channel Download PDFInfo
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- CN101826952A CN101826952A CN200910008097A CN200910008097A CN101826952A CN 101826952 A CN101826952 A CN 101826952A CN 200910008097 A CN200910008097 A CN 200910008097A CN 200910008097 A CN200910008097 A CN 200910008097A CN 101826952 A CN101826952 A CN 101826952A
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Abstract
This invention discloses a method for determining a hybrid automatic repeat request feedback channel. In the method, a base station determines the frame number of the hybrid automatic repeat feedback channel of a current subframe according to the frame number of a radio frame a current downlink subframe belongs to, quantity of occupied subframes in time during primary transmission, receiving and processing delay, quantity and positions of subframes contained in a clear area in the radio frame, quantity of subframes contained in one radio frame, or random combination of the parameters and determines the subframe number of the hybrid automatic repeat feedback channel of the current subframe according to subframe number of the current downlink subframe, quantity of occupied subframes in time during primary transmission, receiving and processing delay, sparse factor, subframe offset and frame number of the hybrid automatic repeat request feedback channel of the current subframe, or random combination of the parameters. The invention simplifies the timing mechanism of an automatic repeat request and improves the flexibility of hybrid automatic repeat request communication under the condition of lower complexity.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of implementation method of mixing automatic repeat requests.
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 (Automatic Retransmission Request, abbreviate ARQ as) and two kinds of technical tie-ups of forward error correction coding (Forward Error Correction abbreviates FEC as) make and be used for realizing.And, the HARQ technology is third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) Long Term Evolution (Long Term Evolution, one of abbreviate LTE as) key technology in system and World Interoperability for Microwave Access, WiMax (World Interoperability for Microwave Access the abbreviates WiMAX as) 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 Frequency Division Duplexing (FDD) OFDM (Frequency Division Duplex-Orthogonal Frequency Division Multiplexing, abbreviate FDD-OFDM as) in the system, uply, descending transmit simultaneously, 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.The FDD system is divided into several littler subframes (Sub-Frame) with radio frames (Radio Frame) usually.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, up and descending have an identical frame structure.
When system communicated by letter in the HARQ mode, because there is processing delay in system, receiving terminal (base station or terminal) needed through processing delay ability feeding back ACK (affirmative acknowledgement) or NACK (negative response) information after receiving data; Simultaneously, transmitting terminal (terminal or base station) also will just can transmit or retransmit through behind certain processing delay after receiving feedback information.The sequential relationship of the re-transmission of the transmission of HARQ data, ACK/NACK feedback, HARQ data is called the timing of HARQ communication.
In the prior art, the HARQ technology of FDD system is the structural design that has whole radio frames at up-downgoing, yet, a plurality of systems and deposit and compatible situation under, for fear of the reasons such as interference between multisystem, make that some subframe is for certain system and unavailable in the radio frames.The frame structure of the FDD of compatible system as shown in Figure 2, descending clear area 1, descending clear area 2 among the figure, up clear area 1, up clear area 2 are disabled to this system, this system can with subframe be positioned at descender region and up zone; Each regional time span integral multiple that all is subframe lengths wherein; Descending clear area 1 length is N among the figure
Dg1Individual subframe, descender region are N
dIndividual subframe, descending clear area 2 is N
Dg2Individual subframe, up clear area 1 length is N
Ug1Individual subframe, up zone are N
uIndividual subframe, up clear area 2 is N
Ug2Individual subframe, each clear area duration can be 0.The number of the idle subframe of Fig. 2 is according to different scenes and inequality.Like this, the HARQ sequential tabulation that provides separately at all scenes is infeasible, causes HARQ timing system complexity to increase.
Therefore, how to provide a kind of simple method, can unify to handle the timing problems of the HARQ under the multiple compatibility condition, become the problem that the technical staff need consider.
Summary of the invention
Technical problem to be solved by this invention provides a kind of feedback channel that mixes automatic repeat requests and determines method, simplifies the HARQ timing method, can adapt to various compatible scenes under the less cost of complexity.
In order to solve the problems of the technologies described above, the invention provides a kind of feedback channel that mixes automatic repeat requests and determine method, described method comprises:
The base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the number that comprises subframe in the clear area is contained in processing delay, the radio frames number of sub-frames and position and the radio frames, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically;
According to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, and perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically.
Furthermore, described base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the number that comprises subframe in the clear area is contained in processing delay, the radio frames number of sub-frames and position and the radio frames, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically, comprising:
The base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the processing delay sum and determine that the mixing of current subframe retransmits the time delay of feedback channel automatically;
The base station retransmits the contained number of sub-frames sum of shared number of sub-frames of time delay and up the 2nd clear area of feedback channel automatically according to the mixing of current subframe, and rounds the frame delay multiple that mixes the feedback channel that retransmits automatically of determining current subframe downwards after the number of the contained subframe of radio frames is divided by;
The base station retransmits feedback channel automatically according to the mixing of current subframe frame delay multiple and the frame number sum of the radio frames at current subframe place are determined the frame number that retransmits the feedback channel place automatically that mixes of current subframe.
Furthermore, described according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprising:
When described current descending sub frame mixes the frame number of frame number and the radio frames at described current descending sub frame place of radio frames at the feedback channel place that retransmits automatically when identical, the time delay that the subframe numbers that the mixing of described current subframe retransmits the feedback channel place automatically retransmits feedback channel automatically by the mixing of current subframe divided by the sparse factor after and the back that rounds up definite with the product of the sparse factor;
Wherein, the mixing of the described current subframe time delay that retransmits feedback channel automatically by the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the processing delay sum and determine.
Perhaps, mix when described current descending sub frame the frame number of radio frames at the feedback channel place that retransmits automatically and described current descending sub frame place radio frames frame number not simultaneously, after the subframe numbers that the mixing of described current subframe retransmits the feedback channel place automatically retransmits the time delay and side-play amount summation of feedback channel automatically by the mixing of current subframe, with
The frame delay multiple of the feedback channel that the mixing of described current subframe automatically retransmits and radio frames comprise product poor of the number of subframe,
Determine with the product of the sparse factor divided by after the sparse factor and the back that rounds up.
In order to solve the problems of the technologies described above, the present invention also provides a kind of feedback channel that mixes automatic repeat requests to determine method, and described method comprises:
Travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once the shared in time number of sub-frames of transmission, receive the clear area is contained in the number that comprises subframe in processing delay, the radio frames, the radio frames number of sub-frames and position and down control channel distribution factor, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically;
According to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, and perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically.
Furthermore, travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once the shared in time number of sub-frames of transmission, receive the clear area is contained in the number that comprises subframe in processing delay, the radio frames, the radio frames number of sub-frames and position and down control channel distribution factor, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically, comprising:
The frame number that makes the mixing of current subframe retransmit the feedback channel place automatically is:
Furthermore, described according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprising:
When the frame number at the frame number at the feedback channel place of described current sub-frame of uplink and described sub-frame of uplink place was identical, the subframe numbers that makes the mixing of current subframe retransmit the feedback channel place automatically was
Wherein n is the subframe numbers of current sub-frame of uplink, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, α is the sparse factor.
Perhaps, when the frame number at the feedback channel place of each sub-frame of uplink during greater than the frame number at described sub-frame of uplink place, the subframe numbers that makes the mixing of current subframe retransmit the feedback channel place automatically is
Wherein n is the subframe numbers of current sub-frame of uplink, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, Δ is a sub-frame offset, N
SfBe the number of sub-frames that each radio frames contains, α is the sparse factor.
Above-mentioned at least one technical scheme proposed by the invention at various compatible scenes, has provided definite method of the feedback channel of normalized HARQ, under the situation of less complexity, has simplified the timing mechanism of HARQ, has improved the flexibility of HARQ communication.
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 structural representation based on the radio frames of frequency division duplex system according to correlation technique.
Fig. 2 is the structural representation based on the radio frames of the compatible system of Frequency Division Duplexing (FDD) according to correlation technique.
Fig. 3 determines method flow diagram according to the feedback channel of the descending HARQ of FDD of the present invention.
Fig. 4 determines method flow diagram according to the feedback channel of FDD ascending HARQ of the present invention.
Fig. 5 be in the present invention's first example based on the descending sub frame schematic diagram related among the descending HARQ of the compatible system of Frequency Division Duplexing (FDD) with uplink feedback channel;
Fig. 6 be in the present invention's second example based on the descending sub frame schematic diagram related among the descending HARQ of the compatible system of Frequency Division Duplexing (FDD) with uplink feedback channel.
Fig. 7 is the schematic diagram based on sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system of Frequency Division Duplexing (FDD) in the present invention's first example.
Fig. 8 is the schematic diagram based on sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system of Frequency Division Duplexing (FDD) in the present invention's second example.
Embodiment
Below in conjunction with accompanying drawing and preferred implementation technical solution of the present invention is elaborated.
The feedback channel that the invention provides the descending HARQ of FDD is determined method, and described method comprises:
The number of the subframe that the base station is contained according to a radio frames, receive processing delay, TTI (Transmission Time Interval, Transmission Time Interval) number of sub-frames and position in number of sub-frames and position, the descender region in length, the up zone, the number and the position of the shared subframe in clear area in radio frames, and the sparse factor of feedback channel and sub-frame offset, determine the position of sub-frame of uplink at the HARQ feedback channel place of each descending sub frame correspondence.
Wherein, described HARQ feedback channel is confirmed (ACK) for carrying HARQ or is negated the running time-frequency resource of (NACK) information; TTI length is the continuous number of sub-frames that a transmission unit comprises in time.
In a preferred embodiment of the invention, as shown in Figure 3, be to determine method flow diagram according to the feedback channel of the descending HARQ of FDD of the present invention.Specifically, described method comprises:
Step 101: the base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the number that comprises subframe in the clear area is contained in processing delay, the radio frames number of sub-frames and position and the radio frames, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically;
Described clear area is described communication system disabled subframe in the radio frames with other system compatible the time.
Step 102: the base station according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, and perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically.
Launch, described base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the number that comprises subframe in the clear area is contained in processing delay, the radio frames number of sub-frames and position and the radio frames, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically, comprising:
The frame number that makes the mixing of current subframe retransmit the feedback channel place automatically is
Wherein m is the frame number of current descending sub frame place radio frames, and n is the subframe numbers of current descending sub frame, N
Ug2Be second number of sub-frames that up clear area is contained in the radio frames, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, N
SfThe number of sub-frames that contains for each radio frames.
Launch, promptly the base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the processing delay sum and determine that the mixing of current subframe retransmits the time delay of feedback channel automatically;
The base station retransmits the contained number of sub-frames sum of shared number of sub-frames of time delay and up the 2nd clear area of feedback channel automatically according to the mixing of current subframe, and rounds the frame delay multiple that mixes the feedback channel that retransmits automatically of determining current subframe downwards after the number of the contained subframe of radio frames is divided by;
The base station retransmits feedback channel automatically according to the mixing of current subframe frame delay multiple and the frame number sum of the radio frames at current subframe place are determined the frame number that retransmits the feedback channel place automatically that mixes of current subframe.
Described base station according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprise two kinds of situations, a kind of situation wherein is:
When the frame number at the frame number at the feedback channel place of current descending sub frame and described current descending sub frame place is identical, make the subframe numbers at the feedback channel place of current subframe be
Wherein n is the subframe numbers of current descending sub frame, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, β is the sparse factor.
Promptly, when described current descending sub frame mixes the frame number of frame number and the radio frames at described current descending sub frame place of radio frames at the feedback channel place that retransmits automatically when identical, the time delay that the subframe numbers that the mixing of described current subframe retransmits the feedback channel place automatically retransmits feedback channel automatically by the mixing of current subframe divided by the sparse factor after and the back that rounds up definite with the product of the sparse factor;
Wherein, the mixing of the described current subframe time delay that retransmits feedback channel automatically by the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the processing delay sum and determine.
Another kind of situation wherein is, when the frame number at the feedback channel place of current subframe during greater than the frame number at described current subframe place, makes the subframe numbers at the feedback channel place of current subframe be
Wherein n is the subframe numbers of current descending sub frame, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, Δ is a sub-frame offset, N
SfThe number of sub-frames that contains for each radio frames; β is the sparse factor.
Promptly when described current descending sub frame mix the frame number of radio frames at the feedback channel place that retransmits automatically and described current descending sub frame place radio frames frame number not simultaneously, after the subframe numbers that the mixing of described current subframe retransmits the feedback channel place automatically retransmits the time delay and side-play amount summation of feedback channel automatically by the mixing of current subframe, with
The frame delay multiple of the feedback channel that the mixing of described current subframe automatically retransmits and radio frames comprise product poor of the number of subframe,
Determine with the product of the sparse factor divided by after the sparse factor and the back that rounds up.
A kind of value of above-described sparse factor-beta can for
N wherein
dBe the number of sub-frames that available descender region comprises, N
uThe number of sub-frames that comprises for available up zone.Be that the described sparse factor is the rounding up of ratio of number and effective sub-frame of uplink number of effective descending sub frame of containing in the radio frames;
Wherein, the number of described effective descending sub frame is the number that can be used for transmitting the descending sub frame of data in the radio frames by native system;
Wherein, the number of described effective sub-frame of uplink is the number that can be used for transmitting the sub-frame of uplink of data in the radio frames by native system.
Definite step of described sub-frame offset is:
Obtain the frame number at the feedback channel place of each descending sub frame;
Determine to satisfy the subframe numbers of the frame number value at feedback channel place more than or equal to the first subframe of the frame number value of corresponding descending sub frame, the time delay that the mixing of described subframe retransmits feedback channel automatically divided by the sparse factor after and the back that rounds up determine interim subframe numbers with the product of the sparse factor;
Described sub-frame offset be number and the described interim subframe numbers of the subframe that comprises in the described radio frames do difference back and described sub-frame of uplink the 1st clear area comprise number of sub-frames and.
Described base station is by the described sub-frame offset of broadcast notice travelling carriage.
In sum, the reference formula of foregoing is as follows:
Through aforesaid scaling method, each subframe can be demarcated with frame number m and subframe numbers n, and promptly (m, n).For subframe (m, n) its feedback channel is (m ', n '),
Wherein β is the sparse factor, and a kind of value can be
The subframe that comprises for available descender region and available up zone comprise the rounding up of ratio of subframe.In above-mentioned formula, N wherein
SfThe number of sub-frames that comprises for each radio frames; N
Ug2Be second number of sub-frames that up clear area is contained in the radio frames, N
TTIBe tti length, be the number of once transmitting shared subframe; P
RxFor receiving processing delay; Δ is a sub-frame offset.Other parameters are shown in mark among the figure.
Determine method at the feedback channel of FDD ascending HARQ that also provides of the present invention, described method comprises:
The number of the subframe that travelling carriage contains according to a radio frames, receive number of sub-frames and position in number of sub-frames and position in processing delay, TTI length, the up zone, the descender region, the number and the position of the shared subframe in clear area in radio frames, and down control channel distribution factor, the sparse factor of feedback channel and sub-frame offset, determine the position of descending sub frame at the HARQ feedback channel place of each sub-frame of uplink correspondence.
In a preferred embodiment of the invention, as shown in Figure 4, be to determine method flow diagram according to the feedback channel of FDD ascending HARQ of the present invention.Said method comprising the steps of:
Step 201: travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once the shared in time number of sub-frames of transmission, receive the clear area is contained in the number that comprises subframe in processing delay, the radio frames, the radio frames number of sub-frames and position and down control channel distribution factor, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically;
Step 202: travelling carriage according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, and perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically.
Launch, travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once the shared in time number of sub-frames of transmission, receive the clear area is contained in the number that comprises subframe in processing delay, the radio frames, the radio frames number of sub-frames and position and down control channel distribution factor, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically, comprising:
The frame number that makes the mixing of current subframe retransmit the feedback channel place automatically is:
Described travelling carriage according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprise two kinds of situations, a kind of situation wherein is:
When the frame number at the frame number at the feedback channel place of current sub-frame of uplink and described sub-frame of uplink place was identical, the subframe numbers that makes the mixing of current subframe retransmit the feedback channel place automatically was
Wherein n is the subframe numbers of current sub-frame of uplink, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, α is the sparse factor.
Another kind of situation wherein is, when the frame number at the feedback channel place of each sub-frame of uplink during greater than the frame number at described sub-frame of uplink place, the subframe numbers that makes the mixing of current subframe retransmit the feedback channel place automatically is
Wherein n is the subframe numbers of current sub-frame of uplink, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, Δ is a sub-frame offset, N
SfBe the number of sub-frames that each radio frames contains, α is the sparse factor.
The value of the above sparse factor-alpha can be
N wherein
dBe the number of sub-frames that available descender region comprises, N
uBe the number of sub-frames that available up zone comprises, n
A-MAPDistribution factor for descending control/feedback channel.
Definite step of described sub-frame offset Δ is:
Obtain the frame number at the feedback channel place of each sub-frame of uplink;
Determine to satisfy the frame number value of the frame number value at feedback channel place, order more than or equal to the first feedback channel place of the frame number value of corresponding sub-frame of uplink
Wherein n is the subframe numbers that satisfies the corresponding sub-frame of uplink of above-mentioned condition;
Make Δ=N
Sf-n
Temp+ N
Dg1, obtain the Δ value, wherein N
Dg1It is the number of sub-frames that first descending clear area is contained in the radio frames.
Overview, the reference formula of foregoing is as follows:
Wherein α is the sparse factor of feedback channel, and a kind of value is
Be rounding up of the sub-frame of uplink number of average each downstream feedback channel correspondence; n
A-MAPBe descending control/feedback channel distribution factor, wherein, n
A-MAPValue is an integer, when value is that the descending control/feedback channel of 1 expression is distributed on each descending sub frame; n
A-MAPBe that the descending control/feedback channel of 2 expressions is distributed on 1 descending sub frame in every interval; n
A-MAPBe that the descending control/feedback channel of 3 expressions is distributed on 2 descending sub frames in every interval, and by that analogy.: Δ is a sub-frame offset.
In above-mentioned formula, N wherein
SfBe the number of sub-frames of each radio frames, N
Dg2Be second number of sub-frames that descending clear area is contained in the radio frames, N
TTIBe tti length, be the number of once transmitting shared subframe; P
RxFor receiving the time delay of handling; n
A-MAPBe descending control/feedback channel distribution factor.
Below by the example in the concrete application technical solution of the present invention is further detailed for example.
With reference to shown in Figure 5, be in the present invention's first example based on the descending sub frame schematic diagram related among the descending HARQ of the compatible system of Frequency Division Duplexing (FDD) with uplink feedback channel.
The principle that increases progressively is in order in time carried out serial number to all radio frames, is called for short frame number; In a radio frames, all subframes are carried out serial number, subframe SF0～SF7 correspondence be numbered 0～7;
Using in the enforcement, each parameter value of above-mentioned formula is as follows: N
SfBe the number of sub-frames of each radio frames, value is 8; N
TTIBe the number of the shared in time subframe of transmission unit, in actual schedule, get integer, for convenience of description, get 1 here and be example more than or equal to 1; P
RxFor receiving the shared in time number of sub-frames of processing delay, get 3 here and be example; n
A-MAPBe the distribution frequency of descending control/feedback channel, its value is 1 o'clock, and the distribution of representing descending Control and Feedback channel is each descending sub frame; Its value is 2 o'clock, and the distribution of representing descending Control and Feedback channel is every a descending sub frame, by that analogy, gets 1 in this example.P
RxWith n
A-MAPConcrete value can be selected according to the practical application needs, and the present invention is not limited this.
In the frame structure as shown in Figure 5, N
Dg1=2, N
d=5, N
Dg2=1, N
Ug1=3, N
u=5, N
Ug2=0.For subframe SF2～SF6, its frame number is M, and its subframe label is 2～6, and feedback channel calculates by formula:
Wherein
Δ=3.The calculation procedure of offset is as follows:
Step 1: by each descending sub frame of formula order computation (m, the frame number m ' at feedback channel place n);
Step 2: the first m ' value that calculates by step 1, and m '-m calculated this n value substitution formula more than or equal to 1 o'clock
Calculate n
TempValue;
Step 3:, calculate Δ=N according to step 2 income value
Sf-n
Temp+ N
Ug1Obtain the Δ value.
With above-mentioned each numerical value substitution formula, by above-mentioned formula, promptly can determine the position of sub-frame of uplink at the HARQ feedback channel place of each descending sub frame correspondence, as shown in Figure 5, and referring to table 1.
Table 1: descending HARQ feedback channel correspondence table
| Descending sub frame | The descending sub frame coordinate | The feedback channel coordinate |
| ??SF2 | ??(M，2) | ??(M，6) |
| ??SF3 | ??(M，3) | ??(M，7) |
| ??SF4 | ??(M，4) | ??(M+1，3) |
| ??SF5 | ??(M，5) | ??(M+1，4) |
| ??SF6 | ??(M，6) | ??(M+1，5) |
With reference to shown in Figure 6, be in the present invention's second example based on the descending sub frame schematic diagram related among the descending HARQ of the compatible system of Frequency Division Duplexing (FDD) with uplink feedback channel.
Using in the enforcement, each parameter value of above-mentioned formula is as follows: N
SfValue is 8; P
RxValue is 3.
In the frame structure as shown in Figure 6, N
Dg1=0, N
d=8, N
Dg2=0, N
Ug1=0, N
u=8, N
Ug2=0,
Δ=0.For descending sub frame SF0～SF7, its frame number is M, and its subframe label is 0～7, as seen, need not in such cases to use this parameter of number of sub-frames that the clear area is contained in the radio frames, and feedback channel calculates by formula:
Further, following formula can be reduced to:
N
TTIValue decide according to the scheduling situation, for simplifying example, get 1 here.
With above-mentioned each numerical value substitution formula, by above-mentioned formula, promptly can determine the position of sub-frame of uplink at the HARQ feedback channel place of each descending sub frame correspondence, as shown in Figure 6, and referring to table 2.
Table 2: descending HARQ feedback channel correspondence table
| Descending sub frame | The descending sub frame coordinate | The feedback channel coordinate |
| ??SF0 | ??(M，0) | ??(M，4) |
| Descending sub frame | The descending sub frame coordinate | The feedback channel coordinate |
| ??SF1 | ??(M，1) | ??(M，5) |
| ??SF2 | ??(M，2) | ??(M，6) |
| ??SF3 | ??(M，3) | ??(M，7) |
| ??SF4 | ??(M，4) | ??(M+1，0) |
| ??SF5 | ??(M，5) | ??(M+1，1) |
| ??SF6 | ??(M，6) | ??(M+1，2) |
| ??SF7 | ??(M，7) | ??(M+1，3) |
Should comprise that also uplink HARQ feedback channel determines method with example.With reference to shown in Figure 7, be the schematic diagram in the present invention's first example based on sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system of Frequency Division Duplexing (FDD).
In Fig. 7, N
Dg1=1, N
d=4, N
Dg2=4, N
Ug1=2, N
u=6, N
Ug2=0.For subframe SF2～SF7, its frame number is M, and its subframe label is 2～7, and feedback channel calculates by formula:
N in the formula
A-MAP=1,
Δ=3.The calculation procedure of offset is as follows:
Step 1: by each sub-frame of uplink of formula order computation (m, the frame number m ' at feedback channel place n);
Step 2: the first m ' value that calculates by step 1, and m '-m is more than or equal to 1 o'clock, with n value substitution formula
Obtain n
TempValue;
Step 3: according to the value that step 2 obtains, substitution formula Δ=N
Sf-n
Temp+ N
Dg1Calculate the Δ value.The feedback channel of each sub-frame of uplink that obtains as shown in Figure 7, and referring to table 3.
Table 3: uplink HARQ feedback channel correspondence table
| Sub-frame of uplink | The sub-frame of uplink coordinate | The feedback channel coordinate |
| ??SF2 | ??(M，2) | ??(M+1，1) |
| ??SF3 | ??(M，3) | ??(M+1，1) |
| ??SF4 | ??(M，4) | ??(M+1，2) |
| Sub-frame of uplink | The sub-frame of uplink coordinate | The feedback channel coordinate |
| ??SF5 | ??(M，5) | ??(M+1，2) |
| ??SF6 | ??(M，6) | ??(M+1，3) |
| ??SF7 | ??(M，7) | ??(M+1，3) |
With reference to shown in Figure 8, be the schematic diagram in the present invention's second example based on sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system of Frequency Division Duplexing (FDD).
Using in the enforcement, each parameter value of above-mentioned formula is as follows: N
SfValue is 8; N
TTIValue is 1; P
RxValue is 3.
In the frame structure as shown in Figure 8, N
Dg1=0, N
d=8, N
Dg2=0, N
Ug1=0, N
u=8, N
Ug2=0,
Δ=0.For descending sub frame SF0～SF7, its frame number is M, and its subframe label is 0～7, as seen, need not in such cases to use this parameter of number of sub-frames that the clear area is contained in the radio frames, and feedback channel calculates by formula:
Further, following formula can be reduced to:
With above-mentioned each numerical value substitution formula, by above-mentioned formula, promptly can determine the position of sub-frame of uplink at the HARQ feedback channel place of each descending sub frame correspondence, as shown in Figure 8, and referring to table 4.
Table 4: uplink HARQ feedback channel correspondence table
| Sub-frame of uplink | The sub-frame of uplink coordinate | Downstream feedback channel coordinate |
| ??SF0 | ??(M，0) | ??(M，4) |
| ??SF1 | ??(M，1) | ??(M，6) |
| ??SF2 | ??(M，2) | ??(M，6) |
| ??SF3 | ??(M，3) | ??(M+1，0) |
| Sub-frame of uplink | The sub-frame of uplink coordinate | Downstream feedback channel coordinate |
| ??SF4 | ??(M，4) | ??(M+1，0) |
| ??SF5 | ??(M，5) | ??(M+1，2) |
| ??SF6 | ??(M，6) | ??(M+1，2) |
| ??SF7 | ??(M，7) | ??(M+1，4) |
In addition; need to prove; can select the parameter that needs are used according to actual conditions in the application, for example, when the reception processing delay can be ignored; to save this parameter in the step then of the present invention; just constituted additional embodiments of the present invention, the form of expression of above-mentioned like this formula has the difference that parameter is selected, but its acquisition the object of the invention technological means is identical; the variation that described parameter is selected is all within protection scope of the present invention.
As mentioned above, by means of the implementation method of the automatic repeat requests of mixing based on frequency division duplex system provided by the invention, calculate by formula and can obtain the pairing feedback channel of each subframe.Under the frame structure situation for the compatible system complexity, this method has simple and flexible, the characteristics that complexity is low.
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 (14)
1. a feedback channel that mixes automatic repeat requests is determined method, it is characterized in that described method comprises:
The base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the number that comprises subframe in the clear area is contained in processing delay, the radio frames number of sub-frames and position and the radio frames, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically;
According to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, and perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically.
2. the method for claim 1, it is characterized in that, described base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the number that comprises subframe in the clear area is contained in processing delay, the radio frames number of sub-frames and position and the radio frames, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically, comprising:
The base station according to the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the processing delay sum and determine that the mixing of current subframe retransmits the time delay of feedback channel automatically;
The base station retransmits the contained number of sub-frames sum of shared number of sub-frames of time delay and up the 2nd clear area of feedback channel automatically according to the mixing of current subframe, and rounds the frame delay multiple that mixes the feedback channel that retransmits automatically of determining current subframe downwards after the number of the contained subframe of radio frames is divided by;
The base station retransmits feedback channel automatically according to the mixing of current subframe frame delay multiple and the frame number sum of the radio frames at current subframe place are determined the frame number that retransmits the feedback channel place automatically that mixes of current subframe.
3. method as claimed in claim 1 or 2, it is characterized in that, described according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprising:
When described current descending sub frame mixes the frame number of frame number and the radio frames at described current descending sub frame place of radio frames at the feedback channel place that retransmits automatically when identical, the time delay that the subframe numbers that the mixing of described current subframe retransmits the feedback channel place automatically retransmits feedback channel automatically by the mixing of current subframe divided by the sparse factor after and the back that rounds up definite with the product of the sparse factor;
Wherein, the mixing of the described current subframe time delay that retransmits feedback channel automatically by the frame number of current descending sub frame place radio frames, once the shared in time number of sub-frames of transmission, receive the processing delay sum and determine.
4. method as claimed in claim 2, it is characterized in that, described according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprising:
Mix when described current descending sub frame the frame number of radio frames at the feedback channel place that retransmits automatically and described current descending sub frame place radio frames frame number not simultaneously, after the subframe numbers that the mixing of described current subframe retransmits the feedback channel place automatically retransmits the time delay and side-play amount summation of feedback channel automatically by the mixing of current subframe, with
The frame delay multiple of the feedback channel that the mixing of described current subframe automatically retransmits and radio frames comprise product poor of the number of subframe,
Determine with the product of the sparse factor divided by after the sparse factor and the back that rounds up.
5. the feedback channel of the automatic repeat requests of mixing as claimed in claim 4 is determined method, it is characterized in that, the described sparse factor is the rounding up of ratio of number and effective sub-frame of uplink number of effective descending sub frame of containing in the radio frames;
Wherein, the number of described effective descending sub frame is the number that can be used for transmitting the descending sub frame of data in the radio frames by native system;
Wherein, the number of described effective sub-frame of uplink is the number that can be used for transmitting the sub-frame of uplink of data in the radio frames by native system.
6. method as claimed in claim 4 is characterized in that, definite step of described sub-frame offset is:
Obtain the frame number at the feedback channel place of each descending sub frame;
Determine to satisfy the subframe numbers of the frame number value at feedback channel place more than or equal to the first subframe of the frame number value of corresponding descending sub frame, the time delay that the mixing of described subframe retransmits feedback channel automatically divided by the sparse factor after and the back that rounds up determine interim subframe numbers with the product of the sparse factor;
Described sub-frame offset be number and the described interim subframe numbers of the subframe that comprises in the described radio frames do difference back and described sub-frame of uplink the 1st clear area comprise number of sub-frames and.
7. as claim 1 or 6 described methods, it is characterized in that described base station is by the described sub-frame offset of broadcast notice travelling carriage.
8. a feedback channel that mixes automatic repeat requests is determined method, it is characterized in that described method comprises:
Travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once the shared in time number of sub-frames of transmission, receive the clear area is contained in the number that comprises subframe in processing delay, the radio frames, the radio frames number of sub-frames and position and down control channel distribution factor, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically;
According to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, and perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically.
9. the feedback channel of the automatic repeat requests of mixing as claimed in claim 8 is determined method, it is characterized in that, travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once the shared in time number of sub-frames of transmission, receive the clear area is contained in the number that comprises subframe in processing delay, the radio frames, the radio frames number of sub-frames and position and down control channel distribution factor, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the frame number at feedback channel place automatically, comprising:
The frame number that makes the mixing of current subframe retransmit the feedback channel place automatically is:
10. the feedback channel of the automatic repeat requests of mixing as claimed in claim 9 is determined method, it is characterized in that, described according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprising:
When the frame number at the frame number at the feedback channel place of described current sub-frame of uplink and described sub-frame of uplink place was identical, the subframe numbers that makes the mixing of current subframe retransmit the feedback channel place automatically was
Wherein n is the subframe numbers of current sub-frame of uplink, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, α is the sparse factor.
11. the feedback channel of the automatic repeat requests of mixing as claimed in claim 9 is determined method, it is characterized in that, described according to the subframe numbers of current descending sub frame, once the shared in time number of sub-frames of transmission, receive processing delay, the sparse factor, sub-frame offset, and the mixing of current subframe retransmits the frame number at feedback channel place automatically, perhaps the combination in any of above parameter determines that the mixing of current subframe retransmits the subframe numbers at feedback channel place automatically, comprising:
When the frame number at the feedback channel place of each sub-frame of uplink during greater than the frame number at described sub-frame of uplink place, the subframe numbers that makes the mixing of current subframe retransmit the feedback channel place automatically is
Wherein n is the subframe numbers of current sub-frame of uplink, N
TTIFor once transmitting the number of shared subframe, P
RxFor receiving the time delay of handling, Δ is a sub-frame offset, N
SfBe the number of sub-frames that each radio frames contains, α is the sparse factor.
12. method as claimed in claim 11 is characterized in that, the value of sparse factor-alpha is
N wherein
dBe the number of sub-frames that available descender region comprises, N
uBe the number of sub-frames that available up zone comprises, n
A-MAPDistribution factor for descending control/feedback channel.
13. method as claimed in claim 11 is characterized in that, definite step of described sub-frame offset Δ is:
Obtain the frame number at the feedback channel place of each sub-frame of uplink;
Determine to satisfy the subframe frame number value of the frame number value at feedback channel place, order more than or equal to the first sub-frame of uplink of the frame number value of corresponding sub-frame of uplink
Wherein n is the subframe numbers that satisfies the corresponding sub-frame of uplink of above-mentioned condition;
Make Δ=N
Sf-N
Temp+ N
Dg1, obtain the Δ value, wherein N
Dg1It is the number of sub-frames that first descending clear area is contained in the radio frames.
14., it is characterized in that described base station is by the described sub-frame offset of broadcast notice travelling carriage as claim 8 or 13 described methods.
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