CN101826952B - 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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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, particularly relate to a kind of implementation method of hybrid automatic repeat-request.
Background technology
Hybrid automatic repeat-request (Hybrid Automatic Retransmission Request, referred to as HARQ) to be a kind of be becomes when overcoming wireless mobile channel and technology that multipath fading proposes the impact of Signal transmissions, this technology is passed through HARQ (Automatic Retransmission Request, referred to as ARQ) and forward error correction coding (Forward Error Correction, referred to as FEC) two kinds of technical tie-ups make for realize.And, HARQ technology is third generation partner program (3rdGeneration Partnership Project, referred to as 3GPP) Long Term Evolution (Long TermEvolution, one of referred to as LTE) key technology in system and World Interoperability for Microwave Access, WiMax (WorldInteroperability for Microwave Access, referred to as WiMAX) system.This technology can make mobile radio system obtain the stability of a system of higher throughput of system and Geng Gao.
ARQ and FEC combines by HARQ technology, when transmit leg sends packet, the check bit of error correction and error detection is carried in each packet, recipient receives and resolves the packet from transmit leg, if the faulty bit number of the packet received is within the error correcting capability of FEC, then mistake can be corrected voluntarily by FEC, does not need to use HARQ technology; If mistake is comparatively serious, that is, the faulty bit data of the packet received beyond the error correcting capability of FEC, are then fed back by NACK, and notice transmit leg resends this error data bag.Like this, recipient, by merging the multiple samples received, can obtain extra snr gain, and can obtain time diversity effect, thus improves throughput and the performance of system.
At Frequency Division Duplexing (FDD) OFDM (Frequency Division Duplex-OrthogonalFrequency Division Multiplexing, referred to as FDD-OFDM) in system, up, descendingly to transmit simultaneously, base station and terminal receive data all needs certain processing time, the processing delay of data can be increased like this, in addition, frame alignment and propagation also can cause certain time delay.Radio frames (Radio Frame) is divided into several less subframe (Sub-Frame) by FDD system usually.Such as, in the wireless frame structure shown in Fig. 1, a radio frames is divided into 8 subframes: SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, wherein, up and descending have identical frame structure.
When system communicates in HARQ mode, because system exists processing delay, receiving terminal (base station or terminal) after receiving the data, needs through processing delay, ability feeding back ACK (affirmative acknowledgement) or NACK (negative response) information; Meanwhile, transmitting terminal (terminal or base station) upon reception of the feedback information, also will, after certain processing delay, just can carry out transmitting or retransmitting.Transmission, the ACK/NACK of HARQ data feed back, the sequential relationship of the re-transmission of HARQ data is called the timing of HARQ communication.
In the prior art, the HARQ technology of FDD system has the structural design of whole radio frames for up-downgoing, but, in multiple system and deposit and compatibility, in order to avoid reasons such as the interference between multisystem, to make in radio frames some subframe for certain system and unavailable.The frame structure of the FDD of compatible system as shown in Figure 2, descending clear area 1, descending clear area 2 in figure, up clear area 1, up clear area 2 are disabled to this system, this system can subframe be positioned at descender region and up region; Wherein the time span of regional is all integral multiples of subframe lengths; In figure, descending clear area 1 length is N
dg1individual subframe, descender region is N
dindividual subframe, descending clear area 2 is N
dg2individual subframe, up clear area 1 length is N
ug1individual subframe, up region is 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 not identical according to different scenes.Like this, it is infeasible for providing respective HARQ sequential list for all scenes, causes HARQ timing system complexity to increase.
Therefore, how to provide a kind of simple method, can unify to process the timing problems of the HARQ under multiple compatibility condition, become the problem that technical staff needs to consider.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of feedback channel defining method of hybrid automatic repeat-request, simplifies HARQ timing method, can adapt to various compatible scene under the cost that complexity is less.
In order to solve the problems of the technologies described above, the invention provides a kind of feedback channel defining method of hybrid automatic repeat-request, described method comprises:
Base station according to the frame number of current downlink subframe place radio frames, once transmit number of sub-frames shared in time, receive the number comprising subframe in number of sub-frames in processing delay, radio frames contained by clear area and position and a radio frames, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter;
According to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter.
Furthermore, described base station according to the frame number of current downlink subframe place radio frames, once transmit number of sub-frames shared in time, receive the number comprising subframe in number of sub-frames in processing delay, radio frames contained by clear area and position and a radio frames, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprising:
Base station according to the frame number of current downlink subframe place radio frames, the time delay once transmitting number of sub-frames shared in time, receive the mixed automatic retransfer feedback channel of processing delay sum determination present sub-frame;
Base station is number of sub-frames sum contained by number of sub-frames and up 2nd clear area shared by the time delay of the mixed automatic retransfer feedback channel of present sub-frame, the frame delay multiple rounding the feedback channel of the mixed automatic retransfer determining present sub-frame downwards after being divided by with the number of subframe contained by radio frames;
Base station is according to the frame number at the mixed automatic retransfer feedback channel place of the frame number sum determination present sub-frame of the frame delay multiple of the mixed automatic retransfer feedback channel of present sub-frame and the radio frames at present sub-frame place.
Furthermore, the described subframe numbers according to current downlink subframe, once transmit in time shared number of sub-frames, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprising:
When the frame number of the radio frames at the feedback channel place of described current downlink subframe mixed automatic retransfer is identical with the frame number of the radio frames at described current downlink subframe place, the subframe numbers at the mixed automatic retransfer feedback channel place of described present sub-frame by the time delay of the mixed automatic retransfer feedback channel of present sub-frame divided by determining with the product of the sparse factor after rounding up after the sparse factor;
Wherein, the mixed automatic retransfer feedback channel of described present sub-frame time delay by current downlink subframe place radio frames frame number, once transmit in time shared number of sub-frames, receive processing delay sum and determine.
Or, when the frame number of the radio frames at the feedback channel place of described current downlink subframe mixed automatic retransfer is different from the frame number of the radio frames at described current downlink subframe place, after the subframe numbers at the mixed automatic retransfer feedback channel place of described present sub-frame is sued for peace by the time delay of the mixed automatic retransfer feedback channel of present sub-frame and side-play amount, with
The frame delay multiple of the feedback channel of the mixed automatic retransfer of described present sub-frame and radio frames comprise the difference of the product of the number of subframe,
Divided by determining with the product of the sparse factor after rounding up after the sparse factor.
In order to solve the problems of the technologies described above, present invention also offers a kind of feedback channel defining method of hybrid automatic repeat-request, described method comprises:
Travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once transmit in time shared number of sub-frames, receive comprise subframe in processing delay, a radio frames number, number of sub-frames in radio frames contained by clear area and position and down control channel distribution factor, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter;
According to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter.
Furthermore, travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once transmit in time shared number of sub-frames, receive comprise subframe in processing delay, a radio frames number, number of sub-frames in radio frames contained by clear area and position and down control channel distribution factor, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprising:
The frame number at the mixed automatic retransfer feedback channel place of present sub-frame is made to be:
wherein n is the subframe numbers of current sub-frame of uplink, N
sffor the number of sub-frames that each radio frames contains, N
tTIfor once transmitting the number of shared subframe, P
rxfor receiving the time delay of process, N
dbe the number of descender region subframe in a radio frames, N
dg2for the number of sub-frames in a radio frames contained by second descending clear area, n
a-MAPfor the distribution factor of descending control/feedback channel.
Furthermore, the described subframe numbers according to current downlink subframe, once transmit in time shared number of sub-frames, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprising:
When the frame number at the feedback channel place of described current sub-frame of uplink is identical with the frame number at described sub-frame of uplink place, the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame is made to be
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 process, α is the sparse factor.
Or, when the frame number at the feedback channel place of each sub-frame of uplink is greater than the frame number at described sub-frame of uplink place, make the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame be
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 process, Δ is sub-frame offset, N
sffor the number of sub-frames that each radio frames contains, α is the sparse factor.
At least one technical scheme above-mentioned proposed by the invention, for various compatible scene, gives the defining method of the feedback channel of normalized HARQ, when less complexity, simplifies the timing mechanism of HARQ, improves the flexibility of HARQ communication.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation of the radio frames based on frequency division duplex system according to correlation technique.
Fig. 2 is the structural representation of the radio frames of the compatible system based on Frequency Division Duplexing (FDD) according to correlation technique.
Fig. 3 is the feedback channel defining method flow chart of the descending HARQ of FDD according to the present invention.
Fig. 4 is the feedback channel defining method flow chart according to FDD ascending HARQ of the present invention.
Fig. 5 is the schematic diagram that in the descending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention first example, descending sub frame associates with uplink feedback channel;
Fig. 6 is the schematic diagram that in the descending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention second example, descending sub frame associates with uplink feedback channel.
Fig. 7 is the schematic diagram of sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention first example.
Fig. 8 is the schematic diagram of sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention second example.
Embodiment
Below in conjunction with accompanying drawing and preferred implementation, technical solution of the present invention is described in detail.
The invention provides the feedback channel defining method of the descending HARQ of FDD, described method comprises:
The number of the subframe that base station is contained according to a radio frames, reception processing delay, TTI (Transmission Time Interval, Transmission Time Interval) length, number of sub-frames and position in number of sub-frames and position, descender region in up region, the number of subframe shared by clear area and position in a radio frames, and the sparse Summing Factor sub-frame offset of feedback channel, determine the position of the sub-frame of uplink at the HARQ feedback channel place that each descending sub frame is corresponding.
Wherein, described HARQ feedback channel is the running time-frequency resource that carrying HARQ confirms (ACK) or negative (NACK) information; TTI length is the continuous print number of sub-frames that a transmission unit comprises in time.
In a preferred embodiment of the invention, as shown in Figure 3, be the feedback channel defining method flow chart of the descending HARQ of FDD according to the present invention.Specifically, described method comprises:
Step 101: base station according to the frame number of current downlink subframe place radio frames, once transmit number of sub-frames shared in time, receive the number comprising subframe in number of sub-frames in processing delay, radio frames contained by clear area and position and a radio frames, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter;
Described clear area be described communication system with disabled subframe in radio frames during other system compatible.
Step 102: base station according to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter.
Launch, described base station according to the frame number of current downlink subframe place radio frames, once transmit number of sub-frames shared in time, receive the number comprising subframe in number of sub-frames in processing delay, radio frames contained by clear area and position and a radio frames, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprising:
The frame number at the mixed automatic retransfer feedback channel place of present sub-frame is made to be
wherein m is the frame number of current downlink subframe place radio frames, and n is the subframe numbers of current downlink subframe, N
ug2for the number of sub-frames in a radio frames contained by second up clear area, N
tTIfor once transmitting the number of shared subframe, P
rxfor receiving the time delay of process, N
sffor the number of sub-frames that each radio frames contains.
Launch, namely base station according to the frame number of current downlink subframe place radio frames, the time delay once transmitting number of sub-frames shared in time, receive the mixed automatic retransfer feedback channel of processing delay sum determination present sub-frame;
Base station is number of sub-frames sum contained by number of sub-frames and up 2nd clear area shared by the time delay of the mixed automatic retransfer feedback channel of present sub-frame, the frame delay multiple rounding the feedback channel of the mixed automatic retransfer determining present sub-frame downwards after being divided by with the number of subframe contained by radio frames;
Base station is according to the frame number at the mixed automatic retransfer feedback channel place of the frame number sum determination present sub-frame of the frame delay multiple of the mixed automatic retransfer feedback channel of present sub-frame and the radio frames at present sub-frame place.
Described base station according to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprise two kinds of situations, a kind of situation is wherein:
When the frame number at the feedback channel place of current downlink subframe is identical with the frame number at described current downlink subframe place, the subframe numbers at the feedback channel place of present sub-frame is made to be
wherein n is the subframe numbers of current downlink subframe, N
tTIfor once transmitting the number of shared subframe, P
rxfor receiving the time delay of process, β is the sparse factor.
Namely, when the frame number of the radio frames at the feedback channel place of described current downlink subframe mixed automatic retransfer is identical with the frame number of the radio frames at described current downlink subframe place, the subframe numbers at the mixed automatic retransfer feedback channel place of described present sub-frame by the time delay of the mixed automatic retransfer feedback channel of present sub-frame divided by determining with the product of the sparse factor after rounding up after the sparse factor;
Wherein, the mixed automatic retransfer feedback channel of described present sub-frame time delay by current downlink subframe place radio frames frame number, once transmit in time shared number of sub-frames, receive processing delay sum and determine.
Another kind of situation is wherein, when the frame number at the feedback channel place of present sub-frame is greater than the frame number at described present sub-frame place, makes the subframe numbers at the feedback channel place of present sub-frame be
wherein n is the subframe numbers of current downlink subframe, N
tTIfor once transmitting the number of shared subframe, P
rxfor receiving the time delay of process, Δ is sub-frame offset, N
sffor the number of sub-frames that each radio frames contains; β is the sparse factor.
Namely when the frame number of the radio frames at the feedback channel place of described current downlink subframe mixed automatic retransfer is different from the frame number of the radio frames at described current downlink subframe place, after the subframe numbers at the mixed automatic retransfer feedback channel place of described present sub-frame is sued for peace by the time delay of the mixed automatic retransfer feedback channel of present sub-frame and side-play amount, with
The frame delay multiple of the feedback channel of the mixed automatic retransfer of described present sub-frame and radio frames comprise the difference of the product of the number of subframe,
Divided by determining with the product of the sparse factor after rounding up after the sparse factor.
A kind of value of above-described sparse factor-beta can be
wherein N
dfor the number of sub-frames that available descender region comprises, N
ufor the number of sub-frames that available upstream region comprises.Namely the described sparse factor is the number of the effective descending sub frame contained in a radio frames and the rounding up of the ratio of effective sub-frame of uplink number;
Wherein, the number of described effective descending sub frame is the number of descending sub frame that can be used for transmitting by native system data in a radio frames;
Wherein, the number of described effective sub-frame of uplink is the number of sub-frame of uplink that can be used for transmitting by native system data in a radio frames.
The determining step of described sub-frame offset is:
Obtain the frame number at the feedback channel place of each descending sub frame;
The frame number value determining to meet feedback channel place is more than or equal to the subframe numbers of the first subframe of the frame number value of corresponding descending sub frame, and the time delay of the mixed automatic retransfer feedback channel of described subframe is divided by determining interim subframe numbers with the product of the sparse factor after rounding up after the sparse factor;
Described sub-frame offset be comprise with described sub-frame of uplink the 1st clear area after the number of the subframe comprised in a described radio frames and described interim subframe numbers make difference number of sub-frames and.
Described base station is by sub-frame offset described in broadcast notice travelling carriage.
In sum, the reference formula of foregoing is as follows:
Through scaling method as above, each subframe can be demarcated with frame number m and subframe numbers n, i.e. (m, n).Be (m ', n ') for its feedback channel of subframe (m, n),
Wherein β is the sparse factor, and a kind of value can be
the subframe comprised for available descender region and available upstream region comprise rounding up of the ratio of subframe.In above-mentioned formula, wherein N
sffor the number of sub-frames that each radio frames comprises; N
ug2for the number of sub-frames in a radio frames contained by second up clear area, N
tTIfor tti length, be the number once transmitting shared subframe; P
rxfor receiving processing delay; Δ is sub-frame offset.Other parameters are as shown in mark in figure.
At the feedback channel defining method additionally providing FDD ascending HARQ 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, up region, descender region, the number of subframe shared by clear area and position in a radio frames, and down control channel distribution factor, the sparse Summing Factor sub-frame offset of feedback channel, determine the position of the descending sub frame at the HARQ feedback channel place that each sub-frame of uplink is corresponding.
In a preferred embodiment of the invention, as shown in Figure 4, be feedback channel defining method flow chart according to 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 transmit in time shared number of sub-frames, receive comprise subframe in processing delay, a radio frames number, number of sub-frames in radio frames contained by clear area and position and down control channel distribution factor, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter;
Step 202: travelling carriage according to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the subframe numbers at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter.
Launch, travelling carriage is according to the frame number of current sub-frame of uplink place radio frames, once transmit in time shared number of sub-frames, receive comprise subframe in processing delay, a radio frames number, number of sub-frames in radio frames contained by clear area and position and down control channel distribution factor, or the frame number at the mixed automatic retransfer feedback channel place of the combination in any determination present sub-frame of above parameter, comprising:
The frame number at the mixed automatic retransfer feedback channel place of present sub-frame is made to be:
wherein n is the subframe numbers of current sub-frame of uplink, N
sffor the number of sub-frames that each radio frames contains, N
tTIfor once transmitting the number of shared subframe, P
rxfor receiving the time delay of process, N
dbe the number of descender region subframe in a radio frames, N
dg2for the number of sub-frames in a radio frames contained by second descending clear area, n
a-MAPfor the distribution factor of descending control/feedback channel.
Described travelling carriage according to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, or the combination in any of above parameter determines the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame, comprise two kinds of situations, a kind of situation is wherein:
When the frame number at the feedback channel place of current sub-frame of uplink is identical with the frame number at described sub-frame of uplink place, the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame is made to be
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 process, α is the sparse factor.
Another kind of situation is wherein, when the frame number at the feedback channel place of each sub-frame of uplink is greater than the frame number at described sub-frame of uplink place, makes the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame be
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 process, Δ is sub-frame offset, N
sffor 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
wherein N
dfor the number of sub-frames that available descender region comprises, N
ufor the number of sub-frames that available upstream region comprises, n
a-MAPfor the distribution factor of descending control/feedback channel.
The determining step of described sub-frame offset Δ is:
Obtain the frame number at the feedback channel place of each sub-frame of uplink;
The frame number value determining to meet feedback channel place is more than or equal to the frame number value at the first feedback channel place of the frame number value of corresponding sub-frame of uplink, order
wherein n is the subframe numbers of the corresponding sub-frame of uplink meeting above-mentioned condition;
Make Δ=N
sf-n
temp+ N
dg1, obtain Δ value, wherein N
dg1for the number of sub-frames in a radio frames contained by first descending clear area.
Overview, the reference formula of foregoing is as follows:
Wherein α is the sparse factor of feedback channel, and a kind of value is
for rounding up of sub-frame of uplink number corresponding to average each downstream feedback channel; n
a-MAPfor descending control/feedback channel distribution factor, wherein, n
a-MAPvalue is 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 expression is distributed at interval of on 1 descending sub frame; n
a-MAPbe that the descending control/feedback channel of 3 expression is distributed at interval of on 2 descending sub frames, and by that analogy.: Δ is sub-frame offset.
In above-mentioned formula, wherein N
sffor the number of sub-frames of each radio frames, N
dg2for the number of sub-frames in a radio frames contained by second descending clear area, N
tTIfor tti length, be the number once transmitting shared subframe; P
rxfor receiving the time delay of process; n
a-MAPfor descending control/feedback channel distribution factor.
Below by the example in embody rule, technical solution of the present invention citing is further detailed.
With reference to shown in Fig. 5, it is the schematic diagram that in the descending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention first example, descending sub frame associates with uplink feedback channel.
The principle increased progressively in order in time, carries out serial number to all radio frames, is called for short frame number; In a radio frame, carry out serial number to all subframes, what subframe SF0 ~ SF7 was corresponding is numbered 0 ~ 7;
In this application is implemented, by as follows for the parameters value of above-mentioned formula: N
sffor the number of sub-frames of each radio frames, value is 8; N
tTIbe the number of the shared in time subframe of a transmission unit, in actual schedule, get the integer being more than or equal to 1, for convenience of description, get 1 here for example; P
rxfor receiving processing delay shared number of sub-frames in time, get 3 here for example; n
a-MAPfor the distribution frequency of descending control/feedback channel, when its value is 1, represent that the distribution of descending control feedback channel is each descending sub frame; When its value is 2, represents that the distribution of descending control feedback channel is every a descending sub frame, by that analogy, get 1 in this example.P
rxwith n
a-MAPconcrete value can need to select according to practical application, and the present invention is not limited this.
In 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 passes through formulae discovery:
Wherein
Δ=3.The calculation procedure of offset Δ is as follows:
Step 1: by the frame number m ' at the feedback channel place of each descending sub frame (m, n) of formula order computation;
Step 2: the first m ' value calculated by step 1, and when m '-m is more than or equal to 1, this n value is substituted into formulae discovery
calculate n
tempvalue;
Step 3: according to step 2 income value, calculates Δ=N
sf-n
temp+ N
ug1obtain Δ value.
Each numerical value above-mentioned is substituted into formula, by above-mentioned formula, namely can determine the position of the sub-frame of uplink at the HARQ feedback channel place that each descending sub frame is corresponding, as shown in Figure 5, and see table 1.
Table 1: descending HARQ feedback channel correspondence table
| Descending sub frame | Descending sub frame coordinate | 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 Fig. 6, it is the schematic diagram that in the descending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention second example, descending sub frame associates with uplink feedback channel.
In this application is implemented, by as follows for the parameters value of above-mentioned formula: N
sfvalue is 8; P
rxvalue is 3.
In 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, visible, and in such cases without the need to using this parameter of number of sub-frames in radio frames contained by clear area, feedback channel passes through formulae discovery:
Further, above formula can be reduced to:
N
tTIvalue determine according to dispatch situation, be simplify example, get 1 here.
Each numerical value above-mentioned is substituted into formula, by above-mentioned formula, namely can determine the position of the sub-frame of uplink at the HARQ feedback channel place that each descending sub frame is corresponding, as shown in Figure 6, and see table 2.
Table 2: descending HARQ feedback channel correspondence table
| Descending sub frame | Descending sub frame coordinate | Feedback channel coordinate |
| SF0 | (M，0) | (M，4) |
| 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) |
This application example also comprises uplink HARQ feedback channel defining method.With reference to shown in Fig. 7, it is the schematic diagram of sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention first example.
In the figure 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 passes through formulae discovery:
In formula
Δ=3.The calculation procedure of offset Δ is as follows:
Step 1: by the frame number m ' at the feedback channel place of each sub-frame of uplink (m, n) of formula order computation;
Step 2: the first m ' value calculated by step 1, and when m '-m is more than or equal to 1, n value is substituted into formula
obtain n
tempvalue;
Step 3: the value obtained according to step 2, substitutes into formula Δ=N
sf-n
temp+ N
dg1calculate Δ value.The feedback channel of each sub-frame of uplink obtained as shown in Figure 7, and see table 3.
Table 3: uplink HARQ feedback channel correspondence table
| Sub-frame of uplink | Sub-frame of uplink coordinate | Feedback channel coordinate |
| SF2 | (M，2) | (M+1，1) |
| SF3 | (M，3) | (M+1，1) |
| SF4 | (M，4) | (M+1，2) |
| SF5 | (M，5) | (M+1，2) |
| SF6 | (M，6) | (M+1，3) |
| SF7 | (M，7) | (M+1，3) |
With reference to shown in Fig. 8, it is the schematic diagram of sub-frame of uplink and downstream feedback channels associated in the ascending HARQ of the compatible system based on Frequency Division Duplexing (FDD) in the present invention second example.
In this application is implemented, by as follows for the parameters value of above-mentioned formula: N
sfvalue is 8; N
tTIvalue is 1; P
rxvalue is 3.
In 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, visible, and in such cases without the need to using this parameter of number of sub-frames in radio frames contained by clear area, feedback channel passes through formulae discovery:
Further, above formula can be reduced to:
Each numerical value above-mentioned is substituted into formula, by above-mentioned formula, namely can determine the position of the sub-frame of uplink at the HARQ feedback channel place that each descending sub frame is corresponding, as shown in Figure 8, and see table 4.
Table 4: uplink HARQ feedback channel correspondence table
| Sub-frame of uplink | Sub-frame of uplink coordinate | Downstream feedback channel coordinates |
| SF0 | (M，0) | (M，4) |
| SF1 | (M，1) | (M，6) |
| SF2 | (M，2) | (M，6) |
| SF3 | (M，3) | (M+1，0) |
| 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; it should be noted that; can select needing the parameter of application according to actual conditions in application, such as, when receiving processing delay and being negligible; then will save this parameter in step of the present invention; just constitute the embodiment that the present invention is other, the form of expression of above-mentioned like this formula has the difference of Selecting parameter, but its acquisition the object of the invention technological means is identical; the change of described Selecting parameter, all within protection scope of the present invention.
As mentioned above, by means of the implementation method of the hybrid automatic repeat-request based on frequency division duplex system provided by the invention, the feedback channel corresponding to each subframe can be obtained by formulae discovery.For in the frame structure situation of compatible system complexity, the method has simple and flexible, the feature that complexity is low.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a feedback channel defining method for hybrid automatic repeat-request, is characterized in that, described method comprises:
Base station according to the frame number of current downlink subframe place radio frames, once transmit number of sub-frames shared in time, receive the number comprising subframe in number of sub-frames in processing delay, radio frames contained by clear area and position and a radio frames, determine the frame number at the mixed automatic retransfer feedback channel place of present sub-frame;
Wherein, base station according to the frame number of current downlink subframe place radio frames, the time delay once transmitting number of sub-frames shared in time, receive the mixed automatic retransfer feedback channel of processing delay sum determination present sub-frame;
Base station is number of sub-frames sum contained by number of sub-frames and up 2nd clear area shared by the time delay of the mixed automatic retransfer feedback channel of present sub-frame, the frame delay multiple rounding the mixed automatic retransfer feedback channel determining present sub-frame downwards after being divided by with the number of subframe contained by radio frames;
Base station is according to the frame number at the mixed automatic retransfer feedback channel place of the frame number sum determination present sub-frame of the frame delay multiple of the mixed automatic retransfer feedback channel of present sub-frame and the radio frames at present sub-frame place;
According to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, determine the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame
Wherein, when the frame number of the radio frames at the mixed automatic retransfer feedback channel place of described current downlink subframe is identical with the frame number of the radio frames at described current downlink subframe place, the subframe numbers at the mixed automatic retransfer feedback channel place of described present sub-frame by the time delay of the mixed automatic retransfer feedback channel of present sub-frame divided by determining with the product of the sparse factor after rounding up after the sparse factor;
Wherein, the mixed automatic retransfer feedback channel of described present sub-frame time delay by current downlink subframe place radio frames frame number, once transmit in time shared number of sub-frames, receive processing delay sum and determine;
When the frame number of the radio frames at the mixed automatic retransfer feedback channel place of described current downlink subframe is different from the frame number of the radio frames at described current downlink subframe place, after the subframe numbers at the mixed automatic retransfer feedback channel place of described present sub-frame is sued for peace by the time delay of the mixed automatic retransfer feedback channel of present sub-frame and side-play amount, with
The frame delay multiple of the mixed automatic retransfer feedback channel of described present sub-frame and radio frames comprise the difference of the product of the number of subframe,
Divided by determining with the product of the sparse factor after rounding up after the sparse factor.
2. the feedback channel defining method of hybrid automatic repeat-request as claimed in claim 1, is characterized in that, the described sparse factor is the number of the effective descending sub frame contained in a radio frames and the rounding up of the ratio of effective sub-frame of uplink number;
Wherein, the number of described effective descending sub frame is the number of descending sub frame that can be used for transmitting by native system data in a radio frames;
Wherein, the number of described effective sub-frame of uplink is the number of sub-frame of uplink that can be used for transmitting by native system data in a radio frames.
3. the method for claim 1, is characterized in that, the determining step of described sub-frame offset is:
Obtain the frame number at the feedback channel place of each descending sub frame;
The frame number value determining to meet feedback channel place is more than or equal to the subframe numbers of the first subframe of the frame number value of corresponding descending sub frame, and the time delay of the mixed automatic retransfer feedback channel of described subframe is divided by determining interim subframe numbers with the product of the sparse factor after rounding up after the sparse factor;
Described sub-frame offset be comprise with sub-frame of uplink the 1st clear area after the number of the subframe comprised in a described radio frames and described interim subframe numbers make difference number of sub-frames with.
4. the method as described in claim 1 or 3, is characterized in that, described base station is by sub-frame offset described in broadcast notice travelling carriage.
5. a feedback channel defining method for hybrid automatic repeat-request, 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 transmit in time shared number of sub-frames, receive comprise subframe in processing delay, a radio frames number, number of sub-frames in radio frames contained by clear area and position and down control channel distribution factor, determine the frame number at the mixed automatic retransfer feedback channel place of present sub-frame;
Wherein, the frame number at the mixed automatic retransfer feedback channel place of present sub-frame is made to be:
wherein m is the frame number of current downlink subframe place radio frames, and n is the subframe numbers of current sub-frame of uplink, N
sffor the number of sub-frames that each radio frames contains, N
tTIfor once transmitting the number of shared subframe, P
rxfor receiving the time delay of process, N
dbe the number of descender region subframe in a radio frames, N
dg2for the number of sub-frames in a radio frames contained by second descending clear area, n
a-MAPfor the distribution factor of descending control/feedback channel;
According to the subframe numbers of current downlink subframe, once transmit number of sub-frames shared in time, receive processing delay, the sparse factor, sub-frame offset, and the frame number at the mixed automatic retransfer feedback channel place of present sub-frame, determine the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame;
Wherein, when the frame number at the feedback channel place of described current sub-frame of uplink is identical with the frame number of described current sub-frame of uplink place radio frames, the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame is made to be
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 process, α is the sparse factor;
When the frame number at the feedback channel place of each sub-frame of uplink is greater than the frame number of described current sub-frame of uplink place radio frames, the subframe numbers at the mixed automatic retransfer feedback channel place of present sub-frame is made to be
Wherein m is the frame number of current downlink subframe place radio frames, and m' is the frame number at the feedback channel place of current sub-frame of uplink, and 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 process, △ is sub-frame offset, N
sffor the number of sub-frames that each radio frames contains, α is the sparse factor.
6. method as claimed in claim 5, it is characterized in that, the value of sparse factor-alpha is
wherein N
dfor the number of sub-frames that available descender region comprises, N
ufor the number of sub-frames that available upstream region comprises, n
a-MAPfor the distribution factor of descending control/feedback channel.
7. method as claimed in claim 5, it is characterized in that, the determining step of described sub-frame offset △ is:
Obtain the frame number at the feedback channel place of each sub-frame of uplink;
The frame number value determining to meet feedback channel place is more than or equal to the subframe frame number value of the first sub-frame of uplink of the frame number value of corresponding sub-frame of uplink, order
wherein n is the subframe numbers of the corresponding sub-frame of uplink meeting above-mentioned condition, n
tempfor the subframe frame number value of the first sub-frame of uplink of the frame number value of corresponding sub-frame of uplink;
Make △=N
sf-n
temp+ N
dg1, obtain △ value, wherein N
dg1for the number of sub-frames in a radio frames contained by first descending clear area.
8. the method as described in claim 5 or 7, is characterized in that, base station is by sub-frame offset described in broadcast notice travelling carriage.
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| WO2009004448A2 (en) * | 2007-07-05 | 2009-01-08 | Nokia Corporation | Shared harq feedback channels for virtual grouping in a wireless relay network |
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