CN102111252A - Hybrid automatic repeat request-based repeat resource distribution method - Google Patents
Hybrid automatic repeat request-based repeat resource distribution method Download PDFInfo
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- CN102111252A CN102111252A CN2009102655882A CN200910265588A CN102111252A CN 102111252 A CN102111252 A CN 102111252A CN 2009102655882 A CN2009102655882 A CN 2009102655882A CN 200910265588 A CN200910265588 A CN 200910265588A CN 102111252 A CN102111252 A CN 102111252A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Abstract
The invention discloses a hybrid automatic repeat request (HARQ)-based repeat source distribution method, which solves the problem of resource conflict caused by the inconsistency of transmission modes of a terminal and a base station. The method comprises the following steps that: in a transmission process of an HARQ data packet, when the terminal fails to transmit the data packet for the Nth time and/or the base station fails to receive the data packet for the Nth time, the base station indicates that the transmission mode for a repeat data packet changes in a downlink control signaling transmitted to the terminal, wherein the downlink control signaling at least also comprises a new transmission mode and the information of an uplink feedback channel position; after receiving and analyzing the downlink control signaling, the terminal transmits an acknowledgement (ACK) at the uplink feedback channel position, and performs transmission in the new transmission mode when the data packet is repeated for the (N+s)th time; and after receiving the ACK transmitted by the terminal, the base station distributes uplink resources according a new resource distribution mode, wherein the N and the s are both natural numbers, and the N+s is less than or equal to a maximum repeat number.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of re-transmission resource allocation methods based on the automatic repeat requests of mixing (Hybrid Automatic Repeat Request abbreviates HARQ as).
Background technology
The HARQ technology is the improvement to the automatic repeat requests of tradition (Automatic Repeat Request abbreviates ARQ as) technology.The HARQ technology combines ARQ technology and forward error correction (Forward ErrorConnection, abbreviate FEC as) technology, and then become fading channel when having reduced to receiving the influence of error rates of data, make wireless communication system that higher more stable data throughput can be provided.HARQ is the 4G (4 of present main flow
ThGeneration, the 4th third-generation mobile communication technology) system, Long Term Evolution (Long-Term Evolution for example, one of abbreviate LTE as) key technology of system and IEEE (Institute of Electrical andElectronics Engineers, IEEE-USA) 802.16m system.
The working mechanism of HARQ is that transmitting terminal sends a packet to receiving terminal, after receiving terminal is received packet, send a feeding back ACK (Acknowledgement confirms to send successfully) or NACK (Non-Acknowledgement confirms to send successful) to transmitting terminal according to the decoding situation.If transmitting terminal is received is ACK then represents transmission success, need not retransmit.If transmitting terminal is received is NACK then represents success of transmission, transmitting terminal can resend a packet and give receiving terminal, and receiving terminal feeding back ACK or NACK is again given transmitting terminal.Whenever once transmit, the number of retransmissions RetransNum of receiving terminal and transmitting terminal needs to add 1, just can abandon transmission when arriving maximum retransmission, carries out packet loss and handles.
In Frequency Division Duplexing (FDD) (Frequency Division Duplex abbreviates FDD as) system, uplink/downlink can transmit data or signal simultaneously, and HARQ mechanism is related with its resource structures.Because the system delay that causes of system link structure, and the data load on the flexible allocation uplink/downlink further is divided into the littler subframe of a plurality of time granularities with a radio frames usually in order to reduce.Wherein, the shared number of sub frames (being time length) of packet is TTI (Transmission TimeInterval, Transmission Time Interval).For example, in wireless frame structure shown in Figure 1, a radio frames is divided into 8 subframes, and the principle that increases progressively is in order carried out serial number to all radio frames, is called for short frame number, and as shown in Figure 1,8 subframes are expressed as SF0-SF7 respectively.Wherein, up link has identical frame structure with down link.
At time division duplex (Time Division Duplex, abbreviate TDD as) in the system, for based on OFDM (Orthogonal Frequency Division Multiplexing, OFDM) or OFDMA (Orthogonal Frequency Division Multiple Access, the OFDM access) wireless communication system, the feedback procedure of its HARQ is mainly according to the frame structure and the resource structures of this wireless communication system, frame structure is described the control structure of Radio Resource on time domain, and resource structures has been described the control structure of Radio Resource on frequency domain.Frame structure is divided into Radio Resource the unit of different brackets on time domain, as superframe (Superframe), frame (Frame), subframe (Subframe) and symbol (Symbol), by being set, different control channel (for example, broadcast channel, clean culture and Multicast Channel etc.) realizes scheduling controlling.
As shown in Figure 2, Radio Resource is divided into superframe on time domain, and each superframe comprises 4 frames, and each frame comprises 8 subframes, and subframe is made up of 6 basic OFDM symbols.Specifically comprising what OFDM symbols in the frame structure in each grade unit determines according to the bandwidth of real system needs support and/or the factors such as circulating prefix-length of OFDM symbol.Wherein can comprise several sub-frame of uplink and descending sub frame in each frame, the packet that sends at descending sub frame sends to terminal by the base station, and terminal is carried out the HARQ feedback by sub-frame of uplink again; The packet that sends at sub-frame of uplink sends to the base station by terminal equally, and the HARQ feedback is carried out by descending sub frame again in the base station.
For a descending/ascending HARQ process, one or more subframes on the downlink/uplink are assigned to this HARQ process, are used to carry data channel, correspondingly, one or more subframes on the uplink/downlink also are assigned to this HARQ process, are used to carry feedback channel.For example, for an ascending HARQ process, the one or more sub-frame of uplink on the up link are used to carry data channel, and correspondingly, the one or more descending sub frames on the down link are used to carry the feedback channel corresponding with data channel.
In addition, system be provided with broadcast channel or claim Broadcast Control Channel in can first descending sub frame in superframe, owing to be positioned at the superframe head, is also referred to as superframe head (Superframe Header), and sends system information such as resource mapping; And the control channel that system can also be provided with clean culture and/or multicast character sends scheduling control informations such as resource allocation.Simultaneity factor can also have A-MAP (Advanced MAP, senior MAP) channel, the A-MAP channel is positioned on the descending sub frame, transmit the service control information, at least can comprise Non user-specific (non-user's special use) A-MAP IE (Information Element, information element), HARQ feedback (HARQ feedback) A-MAP IE, Power control (power control) A-MAP IE, one of control informations such as Assignment A-MAP IE or combination in any.In some communication system (as Wimax 16m communication system), some control information (as Nonuser-specific A-MAP IE) can send at whole users in a frequency partition or a zone.According to factors such as networking technology, interference mitigation technology and types of service, resource structures is divided into a plurality of frequency partition (Frequency Partition abbreviates FP as) with bandwidth available on the frequency domain.
Stipulate in some relevant communication standard at present, when terminal is received first sub bag that the transmission means of stipulating in just according to IE a UL Basic Assignment IE (up basic distribution IE) back (for example resource transmission position) sends the upstream data bag.If transmission first fails to be received upright really decoding, re-transmission can change the transmission means (for example resource transmission position) of retransmission packet, but can not change the place subframe numbers.If need to change the transmission means (for example resource transmission position) of re-transmission really, then need the base station to send a UL Basic Assignment IE again and send the position to notify newly assigned resource; Do not send the position if do not need to change resource, then do not send UL Basic Assignment IE, as long as terminal does not receive that UL Basic Assignment IE will send the position and send upstream data by the resource of preceding UL Basic Assignment IE indication, so just may produce the collision problem of resource.
As shown in Figure 3, when terminal 1 sends the packet failure, 1 one NACK of terminal can be given in the base station, simultaneously may send a UL Basic Assignment A-MAP IE to terminal 1, can send position B by new resource if terminal 1 is received this UL Basic Assignment A-MAP IE and send retransmission packet, and just still can not send position A transmission packet by former resource as receiving UL Basic Assignment A-MAP IE terminal 1, and resource transmission position A might distribute to terminal 2 uses, like this, terminal 1 and terminal 2 shared resources send position transmission data and will cause collision, make two packets correctly not transmit.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of based on the re-transmission resource allocation methods that mixes automatic repeat requests, solves terminal and the resource conflict problem of generation inconsistent with the transmission means of base station.
In order to address the above problem, the invention provides a kind of re-transmission resource allocation methods based on the automatic repeat requests of mixing, in the transmission course of mixing automatic repeat requests (HARQ) packet, described method comprises:
Terminal is when sending described packet failure and/or base station for the N time and receiving described packet the N time and fail, the base station indicates the transmission means that retransmits described packet to change in sending to the descending control signaling of terminal, at least also comprise in this descending control signaling: new transmission means, and uplink feedback channel positional information;
After this descending control signaling is received and parsed to terminal, on described uplink feedback channel position, send and confirm to send successfully (ACK), when retransmitting described packet the N+s time, transmit according to described new transmission means;
After the ACK of terminal transmission is received in the base station, distribute ascending resource according to new resource distribution mode;
Wherein, N, s is natural number, and N+s is smaller or equal to maximum retransmission.
Further, described base station indicates the transmission means that retransmits described packet to change in the following ways:
Heavily distribute indication information by comprising in described descending control signaling, and described heavy distribution indication information gets particular value, the indication transmission means changes.
Further, described base station changes by the transmission means of the described packet of descending control signaling indication re-transmission of particular type.
Further, described descending control signaling comprises up basic assignment information element (UL BasicAssignment IE).
Further, the descending control signaling of described particular type comprises up basic heavy assignment information element (UL Basic ReAssignment IE).
Further, after described descending control signaling is received and parsed to described terminal, still transmit according to former transmission means when retransmitting described packet the N+1 time to the N+s-1 time, wherein, s is more than or equal to 2.
Further, if described terminal is not received described descending control signaling, then still retransmit described packet according to former transmission means.
Further, if described base station is not received the ACK that described terminal sends or is received and confirm to send not success (NACK), then still distribute ascending resource according to former resource distribution mode, simultaneously, resend described descending control signaling or adopt more sane code check and/or modulation system to send described descending control signaling.
Further, described transmission means comprises one of following information or combination in any: resource sends position, the position of multiple-input and multiple-output mode, modulation coding mode, the automatic repeat requests feedback channel of mixing.
It is a kind of based on the re-transmission resource allocation methods that mixes automatic repeat requests that the present invention also provides, and in the transmission course of a HARQ packet, described method comprises:
Terminal is when sending described packet failure and/or base station for the N time and receiving described packet the N time and fail, base station indexed resource in sending to the descending control signaling of terminal sends the position and changes, and at least also comprise in the described control signaling: new resource sends the position;
After terminal is received described control signaling, when retransmitting described packet the N+1 time, on described new resource transmission position, transmit;
The base station is when distributing ascending resource, and the former resource that keeps described terminal sends the position; And knowing that described terminal is after retransmitting described packet on the new resource transmission position, according to new resource distribution mode distribution ascending resource;
Wherein, N is a natural number, and N is less than maximum retransmission.
Further, described base station knows that in the following manner terminal sends the described packet of re-transmission on the position in new resource:
The base station comprises the uplink feedback channel positional information in described descending control signaling, after terminal is received described descending control signaling, send ACK on described uplink feedback channel position, described base station knows that according to the described ACK that receives terminal is to send in new resource to retransmit described packet on the position;
Perhaps, the base station knows that by Data Detection terminal is on new resource transmission position or former resource sends the described packet of re-transmission on the position.
Further, described base station one of in the following manner or the combination indication resource that retransmits described packet send the position and change:
Heavily distribute indication information by comprising in described descending control signaling, and described heavy distribution indication information is particular value, the resource that indication retransmits described packet sends the position and changes;
Indicating the resource that retransmits described packet to send the position by the descending control signaling of particular type changes.
It is a kind of based on the re-transmission resource allocation methods that mixes automatic repeat requests that the present invention provides again, and described method comprises:
The base station sends non-user's dedicated signaling at the whole terminals in the frequency partition, indicate the transmission means that whether has terminal to retransmit the upstream data bag in this frequency partition to change, if indicate the transmission means of a certain terminal to change, then new transmission means is sent to corresponding terminal by descending control signaling;
After terminal in the described frequency partition was received non-user's dedicated signaling, if change has taken place the indication transmission means, and corresponding terminal parses went out described descending control signaling, then retransmitted described upstream data bag according to wherein new transmission means.
Further, after the terminal in the described frequency partition was received described non-user's dedicated signaling, if change has taken place the indication transmission means, and described descending control signaling was irrelevant with oneself, then still retransmits described upstream data bag according to former transmission means.
Further, after the terminal in the described frequency partition is received described non-user's dedicated signaling,, then do not allow to send upstream data, but number of retransmissions adds 1 if fail to parse described descending control signaling;
After the base station knows that terminal does not solve described descending control signaling, resend described descending control signaling or send the higher descending control signaling of robustness.
Further, described non-user's dedicated signaling comprises non-user-specific information element (Non-userSpecific A-MAP IE), and described descending control signaling comprises up basic assignment information element (ULBasic Assignment A-MAP IE).
HARQ provided by the invention retransmits resource allocation methods, has solved the shared channel of a plurality of up users and has sent the problem that may there be conflict in data, has reduced the error rate, and then has improved the efficiency of transmission of system.
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 of radio frames;
Fig. 2 is the frame structure schematic diagram of wireless communication system;
Fig. 3 is that ascending HARQ retransmits the schematic diagram that bumps;
Fig. 4 is the schematic flow sheet that the present invention uses the re-transmission resource allocation methods of example;
Fig. 5 is the schematic flow sheet of the re-transmission resource allocation methods of Another Application example of the present invention.
Embodiment
Re-transmission resource allocation methods provided by the invention adopts following technical scheme:
Scheme one
This scheme mainly comprises the steps:
In the transmission course of a HARQ packet, (N is a natural number to terminal at N, and N is smaller or equal to maximum retransmission R) this packet failure of inferior transmission, and/or (N is a natural number at the N time in the base station, and N is less than maximum retransmission R) when receiving this packet failure, the base station indicates the transmission means that retransmits this packet to change in sending to the descending control signaling of terminal, at least also comprises in this descending control signaling: new transmission means, and uplink feedback channel positional information;
After terminal is received this descending control signaling, on described uplink feedback channel position, send and confirm to send successfully (ACK), when N+s (s is a natural number, and N+s is smaller or equal to maximum retransmission R) this packet of inferior re-transmission, transmit according to described new transmission means;
After the ACK of terminal transmission is received in the base station, distribute ascending resource according to new resource distribution mode.
Preferably, the base station in the following ways the indicating terminal transmission means change:
1, indicate transmission means whether to change by the descending control signaling of particular type, do not change as signaling type 1 expression transmission means, 2 expressions of signaling type transmission means changes; And/or
2, indicate by the indication information in the descending control signaling of same type, in the descending control signaling that sends, comprise heavily distribution (Reassignment) indication information as the base station, whether be used for indication re-transmission transmission of uplink data mode changes, when the value of this Reassignment was a certain particular value (as 1), the indication transmission means changed.
Preferably, if adopt aforesaid way 2, then when Reassignment information equaled 0 (or a certain particular value) in the descending control signaling that the base station sends, this descending control signaling was used for packet of the first biography of indicating terminal, and perhaps transmission means does not change.Also be, if when retransmitting, do not need to change the transmission of uplink data mode, then the base station does not need to send a descending control signaling, when terminal is not received descending control signaling, still sends upstream data according to primary transmission means (as sending for the first time the position of data).Only when needs changed re-transmission transmission of uplink data mode, the base station was just sent out a descending control signaling again.
In addition, because the base station is just to redistribute ascending resource after receiving the described ACK that terminal sends, for the assurance terminal is consistent with the transmission means of base station, after terminal is received the indication that transmission means changes, when sending described ACK, this re-transmission will be transmitted according to former transmission means.
For example, the base station sends signaling S1 to terminal, packet of the first biography of indicating terminal, and Reassignment information equals 0 (or a certain determined value) in the then described signaling;
(N is more than or equal to 1 and less than maximum retransmission R if terminal is at the N time, N wherein, R is the integer more than or equal to 1) the transmission data failure, and the base station need change the transmission means that retransmits this packet, then the base station need send a signaling S2 by down channel to terminal before the N+1 time transmission, information Reassignment wherein equals 1 (or a certain determined value), the transmission means of designation data bag changes, and in signaling S2, notify new transmission means, also have the feedback channel location index of an information pointer simultaneously to information S2;
Terminal by separating content wherein, is learnt the position of feedback channel after receiving signaling S2, earlier do not retransmit the transmission means of using new indication and sends data at the N+1 time, but still according to the transmission means transmission upstream data bag that transmits for the N time.Simultaneously, send an acknowledge message ACK on the feedback channel position of appointment, the informing base station corresponding terminal has been received signaling S2;
The base station confirms that signaling S2 is gone out by terminal parses after receiving ACK, if (m is a natural number to also have N+1+m, and N+1+m is smaller or equal to R) inferior re-transmission, then the base station receives packet according to the transmission means of indicating among the S2 when the inferior retransmission packet of N+1+m (m is a natural number, and N+1+m is smaller or equal to R) receives.If the affirmation message ACK that terminal sends is not received in the base station on feedback channel, think that then corresponding terminal do not receive signaling S2, then (m is a natural number to N+1+m, and N+1+m is smaller or equal to R) still can use the N time during inferior reception retransmission data packet may and transmission means that the N+1 time transmission used receives, rather than the transmission means of indicating among the signaling S2.
Wherein, the base station sent above-mentioned signaling S1 and S2 can have identical or different configuration and content.
Further, in ascending HARQ mechanism, the base station sends the transmission of uplink data mode by descending control signaling notice terminal, described transmission means comprises one of following or combination: resource sends the position, the position of MIMO (Multiple Input Multiple Output, multiple-input and multiple-output) mode, modulation coding mode, HARQ feedback channel.Wherein, resource sends the position and refers to packet occupied subcarrier on time domain and the frequency domain in communication system.The MIMO mode system of referring to carries out the mode of many antennas STC (SpaceTime Coding, Space Time Coding), maybe can claim the MIMO code check.Modulation coding mode refers to modulator approach and the coding method of using when resource sends.The position of HARQ feedback channel refers to HARQ feedback information occupied subcarrier on time domain and the frequency domain in communication system.
Scheme two
This scheme mainly comprises the steps:
In the transmission course of a HARQ packet, (N is a natural number to terminal at the N time, and N is smaller or equal to maximum retransmission R) send the failure of this packet, the base station is indicated the resource that retransmits this packet to send the position in sending to the descending control signaling of terminal and is changed, and at least also comprise in this control signaling: new resource sends the position;
After terminal is received this control signaling, when retransmitting this packet the N+1 time, on new resource transmission position, transmit;
The base station is when distributing ascending resource, and the former resource that keeps described terminal sends the position, and is knowing that terminal is after retransmitting upstream data on the described new resource transmission position, according to new resource distribution mode distribution ascending resource.
Wherein, whether the base station changes indexed resource transmission position in the following ways:
1, indicate by dissimilar descending control signalings, do not change as signaling type 1 expression transmission means, 2 expressions of signaling type transmission means changes; And/or
2, indicate by the indication information in the descending control signaling of same type, in the descending control signaling that sends, comprise heavily distribution (Reassignment) indication information as the base station, indicate the transmission means that retransmits the upstream data bags whether to change by the different values of this Reassignment.
2 is example in the above described manner, (N is more than or equal to 1 if terminal is at the N time, less than maximum retransmission R) the transmission data failure, and the base station need change the transmission means that retransmits this packet, then send the new transmission means of descending control signaling S3 notice terminal, and the first time re-transmission (the N+1 time) of new transmission means after this descending control signaling S3 receives comes into force to terminal.
After terminal is received signaling S3,, then retransmit just according to new transmission means transmits data packets for the N+1 time if Reassignment equals 1 (or a certain determined value).At this moment, the base station will send position and former resource transmission position for this terminal keeps new resource simultaneously when distributing the upstream data resource.If terminal parses has gone out corresponding signaling S3, then will be with new transmission means transmits data packets; If terminal does not parse corresponding signaling S3, then still with old transmission means transmits data packets.
In this scheme, the base station can adopt following dual mode to confirm whether terminal parses signaling S3:
A, the position of feedback channel is notified in the base station in signaling S3, and terminal sends ACK to terminal on the feedback channel position of appointment after receiving signaling S3, and informing base station has parsed signaling S3;
B, the base station need not notice terminal feedback channel position in signaling S3, and terminal also need not send uplink feedback information ACK/NACK to the base station.Data Detection can be passed through in the base station, learns that terminal is according to new transmission means or former transmission means transmission data, thereby learns whether terminal parses signaling S3.
Scheme three
This scheme mainly comprises the steps:
The base station sends non-user's dedicated signaling at the whole terminals in the frequency partition, whether indicate has the transmission means of terminal to change in this frequency partition, if indicate the transmission means of a certain terminal to change, then new transmission means sent to relevant terminal by descending control signaling;
After terminal in the described frequency partition was received non-user's dedicated signaling, if change has taken place the indication transmission means, and counterpart terminal parsed described descending control signaling, then retransmitted upstream data according to wherein new transmission means;
When the base station knows that by Data Detection terminal retransmits upstream data according to new transmission means, distribute ascending resource according to new resource distribution mode.
Further, if counterpart terminal fails to parse described descending control signaling, then do not allow to retransmit upstream data;
The unaltered terminal of other transmission meanss still retransmits upstream data according to former transmission means after knowing that according to STID described descending control signaling and oneself are irrelevant; If it is irrelevant with oneself that the unaltered terminal of other transmission meanss fails to parse described descending control signaling, equally do not allow to retransmit upstream data yet.
Like this, Data Detection can be passed through in the base station, which terminal not to send upstream data according to, can determine to fail to parse the terminal of described descending control signaling.Fail to parse described descending control signaling if change the terminal of transmission means, then the base station need resend described descending control signaling at described terminal, till described terminal correctly parses described descending control signaling or reaches maximum retransmission.In addition, the base station also can determine by the ACK of terminal whether terminal receives the control signaling.
Preferably, in this scheme, (N is more than or equal to 1 if terminal is at the N time, less than maximum retransmission R) the transmission data failure, and this packet A has changed transmission means in re-transmission, the indication information that sends a bit can be gone up by the control signaling S4 (as the Non-user Specific A-MAP IE in the 16m communication system) of whole terminals in the base station at a frequency partition, whether this indication information is used to indicate the transmission means of the terminal in the frequency partition to change.If this information is 0 (or a certain determined value), illustrating does not have the transmission means of terminal to change, even terminal does not parse some or some control signaling (as the UL Basic Assignment A-MAP IE in the 16m communication system), but know that these control signalings are irrelevant with oneself, still can send according to the transmission means that the last time transmission is used.If this information is 1 (or a certain determined value), then explanation has the transmission means of some or some terminal that change has taken place, then these terminals must parse whole control signalings or just can transmit data with own relevant control signaling, otherwise do not allow to retransmit the upstream data bag.The first time re-transmission (the N+1 time) of new transmission means after this descending control signaling S4 receives comes into force.For the terminal that does not parse A-MAP IE, also must add 1 even without sending data corresponding retransmission number of times, to guarantee the consistent of base station and terminal number of retransmissions.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described.If do not conflict, the feature among each embodiment of the application and the embodiment can make up mutually.
Embodiment one
In the present embodiment, with up basic distribution A-MAP IE (UL BasicAssignment A-MAP IE in the communication system, hereinafter also abbreviate A-MAP IE as) as descending control signaling, and with a bit among the A-MAP IE as the ReAssignment indication information.If ReAssignment=0, illustrate that so this UL Basic Assignment A-MAP IE is the A-MAP IE to new data packets, after terminal parses goes out at once as indicated transmission means send packet, the base station also receives packet according to the transmission means of correspondence; If ReAssignment=1 illustrates that then this ULBasic Assignment A-MAP IE is the resource allocation again to retransmission data packet may.
Sending the position with the resource in the transmission means below is example, is further described retransmitting the resource allocation flow process.As shown in Figure 4, the A-MAP IE that terminal 1 sends according to the base station, when transmits data packets is failed for the first time on resource transmission position A, the base station sends on the B of position in new resource by A-MAP IE indication and retransmits, terminal 1 is after receiving this A-MAP IE signaling, when this (for the second time) transmits, still send on the A of position and send data, and need receive this A-MAP IE by a uplink feedback channel transmission ACK/NACK informing base station in the resource of not upgrading.The base station is behind the ACK that receives 1 couple of this A-MAPIE of terminal, just can be distribute ascending resource by new resource distribution mode during (for the third time) transmission, so this UL Basic Assignment A-MAP IE need could onset at the next retransmission time that send next time.
As shown in Figure 5, in the step (5), if the ACK of the A-MAP IE that is sent in 1 pair of step of terminal (4) is not received in the base station, or receive NACK, the base station thinks that terminal 1 do not receive corresponding UL Basic Assignment A-MAP IE so, the base station changes the indication that is sent in the repeating step (4) the A-MAP IE of transmission means, receive the ACK of terminal 1 transmission until step (9) after, just can when the 4th transmission, distribute ascending resource, promptly send the ascending resource of position B distributing terminals 1 in resource by new resource distribution mode.In addition, after the ACK of terminal 1 transmission was received in the base station, the affirmation terminal was received indication, then the former resource of terminal 1 can be sent position A and distribute to other terminal (as terminal 2).
In the present embodiment, when ReAssignment=0, the downstream feedback channel position of the HFA denoting signaling upstream data among the UL Basic Assignment A-MAP IE.When ReAssignment=1, the channel of the HFA signaling indication among the UL Basic Assignment A-MAP IE is represented the uplink feedback channel position of UL BasicAssignment A-MAP IE.Like this, only increase 1bit expense on the UL BasicAssignment A-MAP IE need added.
Embodiment two
The realization flow of present embodiment and embodiment one are basic identical, also need the uplink HARQ feedback channel of base station assigns at A-MAPIE, and the base station just can be according to new mode Resources allocation after receiving the ACK that terminal sends, and that is to say needs to wait for that a frame time could onset.
Be that with the difference of embodiment one present embodiment carries out certain improvement on the basis of embodiment one, defined a brand-new A-MAP IE signaling, promptly up basic heavy assignment information element (ULBasic ReAssignment A-MAP IE).Whether in the present embodiment, the base station need not to comprise indication information in descending control signaling, but change by UL Assignment A-MAP IE and two kinds of signaling type indicating terminals of UL ReAssignmentA-MAP IE transmission means.When the base station needs indicating terminal to change transmission means, by the new transmission means of this UL ReAssignment A-MAP IE signaling terminal.In addition, the content of this UL ReAssignment A-MAP IE signaling is compared more succinct with UL Basic Assignment A-MAP IE among the embodiment one.Because some basic information had sent among formerly the UL Basic Assignment A-MAP IE and can not change, for example represent the signaling Long TTI Indicator of sub-packet length, expression user's the signaling ACID of HARQ channel label, so in UL Basic ReAssignment A-MAP IE, can dispense, resource indication information, A-MAP IE feedback channel index, IE Type basic information content such as (IE types) need only be comprised, the bit expense can be suitably reduced like this.
Embodiment three
Present embodiment was optimized in the basic enterprising step of embodiment one and embodiment two, do not need to define new A-MAP IE signaling, still a Reserved (reservation) bit among the existing UL Basic Assignment A-MAP IE is used as the ReAssignment indication information.When ReAssignment=0, other information formats among the UL Basic Assignment A-MAP IE are constant, it still is the 56bit content, when Re Assignment=1, the information content that sent in initial UL Basic Assignment A-MAP IE can be saved, therefore, can save the part expense.
In fact, present embodiment is compared with embodiment two, both differences are, when ReAssignment=1, need not define a new signaling type, but carry out certain modification at present UL Basic AssignmentA-MAP IE, can delete the information that has comprised and can not change among the UL Basic AssignmentA-MAP IE that sends for the first time, for example represent signaling Long TTI Indicator, the expression user's of sub-packet length the signaling ACID etc. of HARQ channel label, thereby can save a lot of expenses.
Embodiment four
Present existing Non-user Specific A-MAP IE is the information that sends at whole users on the frequency partition, and the send mode that Non-user Specific A-MAP IE uses is more sane than other IE, i.e. other IE height of likelihood ratio of parsing of Non-user Specific A-MAP IE.In the present embodiment, can be at the information Reassignment Bit of a bit of Non-user Specific A-MAP IE definition, public by all terminals, as long as the Resource Index (resource index) of any one terminal has been redistributed in the base station, Reassignment just puts 1, otherwise when not having the Resource Index of terminal to be reallocated, Reassignment is defaulted as 0.If the base station need change the Resource Index of a terminal, not only Reassignment be put 1, also to send a UL Basic Assignment A-MAP IE and notify the resource index after relevant terminal changes (being that resource sends the position).
When terminal parses went out Non-user Specific A-MAP IE and obtains Reassignment=0, illustrating did not have the Resource of terminal Index to change, and even without the IE that parses other, still can send data on original position.
If terminal parses goes out Reassignment=1, then must parse corresponding UL BasicAssignment A-MAP IE and could send data, no matter whether the resource of oneself changes, corresponding UL Basic Assignment A-MAP IE comes into force after acceptance at once, without any need for feeding back to the base station.
If terminal does not parse UL Basic Assignment A-MAPIE when Reassignment=1, though be original just not or do not separate out, all can not send on the position in corresponding resource and send data, the base station can learn that certain terminal does not solve A-MAP IE by following manner:
(1) terminal that solves UL Basic Assignment A-MAP IE has the ACK/NACK feedback at this A-MAP IE.
(2) detect which piece resource location and do not send data, given each terminal because the base station sends the position to different resource, therefore, the base station can determine which terminal does not parse A-MAP IE by this corresponding relation.
For not parsing the terminal that A-MAP IE and Resource Index change, the same operation will be carried out at next frame (N+1 frame) in the base station, send Non-user Specific A-MAP IE and UL Basic Assignment A-MAP IE, till packet correctly parses or reaches maximum retransmission.Do not have the terminal that changes for not parsing A-MAP IE relevant with self and Resource Index, next frame (N+1 frame) does not allow to send the upstream data bag.
For the terminal that does not parse A-MAP IE; also must add 1 even without sending data corresponding retransmission number of times RetransNum; consistent with the RetransNum that guarantees base station and terminal; that is to say; arrived the moment that passes packet even terminal does not pass packet, RetransNum adds 1 automatically.
Embodiment five
A-MAP IE is not made an amendment in some relevant communication standard at present, after a UL Basic Assignment A-MAP IE who requires terminal to change transmission packet position sends to terminal, if that receive when this transmission receives feedback the base station is NACK, then need to use to the more sane or the most sane code check of A-MAP IE and/or modulation system (such as 1/4 code check being changed into 1/8 code check, or change QPSK modulation into the BPSK modulation) UL Basic Assignment A-MAP IE is sent once when retransmit next time again, be more prone to parse the UL Basic AssignmentA-MAP IE of current transmission to guarantee terminal.
Embodiment six
In some communication system, HARQ is longer dispatching cycle regularly, can further improve the method for previous embodiment.After the terminal of base station sends the transmission position change of UL Basic Assignment A-MAP IE or the notifying changed terminal packet of other A-MAP IE, after terminal is received A-MAP IE and is parsed, also have the long period if send the upstream data bag apart from terminal, terminal can send ACK/NACK before sending retransmission data packet may.The base station is receiving that ACK/NACK retransmits the distribution of resource again, if receive ACK then carry out resource allocation and receive the upstream data bag, if receive NACK or do not receive ACK then carry out resource allocation and receive the upstream data bag according to original method according to the indication among the up-to-date A-MAP IE.Like this can be so that the terminal of base station sends UL BasicAssignment A-MAP IE or other A-MAP IE can retransmit just come into force the first time after transmission, rather than retransmit its second time after sending and come into force.
Embodiment seven
Present embodiment carries out certain improvement on the basis of previous embodiment, do not define new A-MAPIE signaling type, when terminal can't correctly parse A-MAP IE maybe can't determine whether relevant for oneself A-MAP IE the time, do not send any data in the position of distributing, bump with the upstream data bag of avoiding a plurality of terminals, data can be found not send on some resource according to corresponding some prior art in the base station.Do not need up HARQ feedback channel base station just to know whether terminal parses corresponding A-MAP IE like this.For the terminal that does not parse corresponding A-MAP IE and resource transmission position change, the base station will resend the higher or identical A-MAP IE of robustness next time when transmitting, so that terminal is more prone to parse the UL Basic Assignment A-MAP IE of current transmission.
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 encompassed within the protection range of claim of the present invention.
Claims (16)
1. the re-transmission resource allocation methods based on the automatic repeat requests of mixing is characterized in that, in the transmission course of mixing automatic repeat requests (HARQ) packet, described method comprises:
Terminal is when sending described packet failure and/or base station for the N time and receiving described packet the N time and fail, the base station indicates the transmission means that retransmits described packet to change in sending to the descending control signaling of terminal, at least also comprise in this descending control signaling: new transmission means, and uplink feedback channel positional information;
After this descending control signaling is received and parsed to terminal, on described uplink feedback channel position, send and confirm to send successfully (ACK), when retransmitting described packet the N+s time, transmit according to described new transmission means;
After the ACK of terminal transmission is received in the base station, distribute ascending resource according to new resource distribution mode;
Wherein, N, s is natural number, and N+s is smaller or equal to maximum retransmission.
2. the method for claim 1 is characterized in that,
Described base station indicates the transmission means that retransmits described packet to change in the following ways:
Heavily distribute indication information by comprising in described descending control signaling, and described heavy distribution indication information gets particular value, the indication transmission means changes.
3. the method for claim 1 is characterized in that,
Described base station changes by the transmission means of the described packet of descending control signaling indication re-transmission of particular type.
4. method as claimed in claim 2 is characterized in that,
Described descending control signaling comprises up basic assignment information element (UL Basic AssignmentIE).
5. method as claimed in claim 3 is characterized in that,
The descending control signaling of described particular type comprises up basic heavy assignment information element (UL BasicReAssignment IE).
6. the method for claim 1 is characterized in that,
After described descending control signaling is received and parsed to described terminal, still transmit according to former transmission means when retransmitting described packet the N+1 time to the N+s-1 time, wherein, s is more than or equal to 2.
7. as each described method of claim 1 to 6, it is characterized in that,
If described terminal is not received described descending control signaling, then still retransmit described packet according to former transmission means.
8. as each described method of claim 1 to 6, it is characterized in that,
If described base station is not received the ACK that described terminal sends or is received and confirm to send not success (NACK), then still distribute ascending resource according to former resource distribution mode, simultaneously, resend described descending control signaling or adopt more sane code check and/or modulation system to send described descending control signaling.
9. as each described method of claim 1 to 6, it is characterized in that,
Described transmission means comprises one of following information or combination in any: resource sends position, the position of multiple-input and multiple-output mode, modulation coding mode, the automatic repeat requests feedback channel of mixing.
10. one kind based on the re-transmission resource allocation methods that mixes automatic repeat requests, it is characterized in that in the transmission course of a HARQ packet, described method comprises:
Terminal is when sending described packet failure and/or base station for the N time and receiving described packet the N time and fail, base station indexed resource in sending to the descending control signaling of terminal sends the position and changes, and at least also comprise in the described control signaling: new resource sends the position;
After terminal is received described control signaling, when retransmitting described packet the N+1 time, on described new resource transmission position, transmit;
The base station is when distributing ascending resource, and the former resource that keeps described terminal sends the position; And knowing that described terminal is after retransmitting described packet on the new resource transmission position, according to new resource distribution mode distribution ascending resource;
Wherein, N is a natural number, and N is less than maximum retransmission.
11. method as claimed in claim 10 is characterized in that,
Described base station knows that in the following manner terminal sends the described packet of re-transmission on the position in new resource:
The base station comprises the uplink feedback channel positional information in described descending control signaling, after terminal is received described descending control signaling, send ACK on described uplink feedback channel position, described base station knows that according to the described ACK that receives terminal is to send in new resource to retransmit described packet on the position;
Perhaps, the base station knows that by Data Detection terminal is on new resource transmission position or former resource sends the described packet of re-transmission on the position.
12. as claim 10 or 11 described methods, it is characterized in that,
Described base station one of in the following manner or the combination indication resource that retransmits described packet send the position and change:
Heavily distribute indication information by comprising in described descending control signaling, and described heavy distribution indication information is particular value, the resource that indication retransmits described packet sends the position and changes;
Indicating the resource that retransmits described packet to send the position by the descending control signaling of particular type changes.
13. the re-transmission resource allocation methods based on the automatic repeat requests of mixing is characterized in that described method comprises:
The base station sends non-user's dedicated signaling at the whole terminals in the frequency partition, indicate the transmission means that whether has terminal to retransmit the upstream data bag in this frequency partition to change, if indicate the transmission means of a certain terminal to change, then new transmission means is sent to corresponding terminal by descending control signaling;
After terminal in the described frequency partition was received non-user's dedicated signaling, if change has taken place the indication transmission means, and corresponding terminal parses went out described descending control signaling, then retransmitted described upstream data bag according to wherein new transmission means.
14. method as claimed in claim 13 is characterized in that,
After terminal in the described frequency partition was received described non-user's dedicated signaling, if change has taken place the indication transmission means, and described descending control signaling was irrelevant with oneself, then still retransmits described upstream data bag according to former transmission means.
15. method as claimed in claim 13 is characterized in that,
After terminal in the described frequency partition is received described non-user's dedicated signaling,, then do not allow to send upstream data, but number of retransmissions adds 1 if fail to parse described descending control signaling;
After the base station knows that terminal does not solve described descending control signaling, resend described descending control signaling or send the higher descending control signaling of robustness.
16. as claim 13,14 or 15 described methods, it is characterized in that,
Described non-user's dedicated signaling comprises non-user-specific information element (Non-user SpecificA-MAP IE), and described descending control signaling comprises up basic assignment information element (UL BasicAssignment A-MAP IE).
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| PCT/CN2010/073430 WO2010148917A1 (en) | 2009-12-25 | 2010-06-01 | Method, base station and terminal for assigning re-transmission resources based on hybrid automatic repeat request |
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| CN102111252B (en) | 2014-03-19 |
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