CN103997396A - Hybrid automatic retransmission method, apparatus and system in FDD-LTE network - Google Patents
Hybrid automatic retransmission method, apparatus and system in FDD-LTE network Download PDFInfo
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- CN103997396A CN103997396A CN201310053173.5A CN201310053173A CN103997396A CN 103997396 A CN103997396 A CN 103997396A CN 201310053173 A CN201310053173 A CN 201310053173A CN 103997396 A CN103997396 A CN 103997396A
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Abstract
The invention discloses a hybrid automatic retransmission method, apparatus and system in an FDD-LTE network. The hybrid automatic retransmission method comprises: configuring a transmission time interval k, the transmission time interval k being a time interval between the time when a base station receives PUSCH information sent by a user terminal and the time when the base station sends PHICH information to the user terminal; sending indication information to the user terminal at an i-th download subframe, the indication information comprising the transmission time interval k; receiving the PUSCH information sent by the user terminal on an (i+4)-th uplink subframe; sending the PHICH information to the user terminal on an (i+4+k)-th downlink subframe; and if the PHICH information comprises a negative acknowledgement message, receiving the PUSCH information retransmitted by the user terminal on an (i+4+k+4)-th uplink subframe, such that the time for sending the PHICH information can be flexibly scheduled and deposed, and LTE can more flexibly support the application scenes of a multilayer/multi-cell large scale antenna combined processing technology.
Description
Technical field
The present invention relates to the communications field, particularly a kind of FDD-LTE(Frequency Division Duplexing-Long Term Evolution, Frequency Division Duplexing (FDD) Long Term Evolution) methods, devices and systems of mixed automatic retransfer in network.
Background technology
(Hybrid Automatic Repeat Request is called for short: HARQ) technology is a kind of transmission technology extensively adopting in mobile communication mixed automatic retransfer.In this technology, data receiver is according to the ACK(Acknowledgement of recipient's feedback, confirm)/NACK(Negative Acknowledgement, deny) information, with the data packet format of making an appointment, retransmit the data of makeing mistakes, thereby help recipient to recover error data, improve data transmission efficiency.
According to 3GPP(The3
rdgeneration Partnership Project, third generation partner program) TS36.213 regulation and stipulation, (the evolved Node B of base station in FDD-LTE system ascending HARQ transmitting procedure, be called for short: eNB) and terminal (User Equipment, abbreviation: timing of channels relation UE) as shown in Figure 1:
1) base station is that UE distributes up PUSCH channel to send resource by Downlink Control Information;
2) terminal, after receiving Downlink Control Information, is passed through PUSCH(Physical Uplink Shared Channel, physical uplink link sharing channel in respective physical resource according to the indication of Downlink Control Information) channel transmission information;
3) base station receives after PUSCH information, sends PHICH(Physical HARQ Indicator Channel, physical mixing retransmission indicating chanel) whether correct in feedback information indication if receiving data;
4) UE carries out new data transmission or retransmits original information according to base station PHICH channel indicating information.
Because retransmitting mode, current LTE synchronous HARQ between UE upstream data PUSCH and base station down ACK/NACK feedback information, defined fixing time delay (4ms) interval, this is to single BBU of base station (Building Baseband Unit, indoor baseband processing unit) and RRU(Remote Radio Unit, transmission line and BBU processing speed remote radio unit (RRU)) have all proposed higher requirement.The special LTE deployment scenario for the extensive antenna Combined Treatment in multilayer/many communities, under so strict delay requirement, multi-plot joint treatment system only could be worked under jumbo return link is supported, otherwise very difficult deployment and assurance system are normally worked.
Fig. 2 has provided the schematic diagram that in prior art, ascending HARQ is processed.Wherein:
Step 201, base station sends indication information at i descending sub frame to user terminal.
Step 202, user terminal sends PUSCH information on i+4 sub-frame of uplink to base station.
Step 203, base station judges whether described PUSCH information occurs mistake, and to user terminal, send the PHICH information as PUSCH information feedback on i+4+4 descending sub frame, wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises NACK message; When the described PUSCH information of judgement does not have mistake, PHICH information comprises ACK message.
Step 204, if PHICH information comprises negative acknowledgment message, user terminal resends described PUSCH information on i+4+4+4 sub-frame of uplink.
In single base station system, subframe Yi1msWei unit due to LTE, BBU needs could process after complete reception 1ms data, therefore receive data and deal with data time delay must be greater than 1ms, for the data feedback time delay that guarantees to meet between eNB and UE meets 4ms, between BBU and RRU, up-downgoing data transmission delay need be less than 2ms.Between BBU and RRU, great majority, by fiber direct connection, can meet the HARQ feedback delay requirement of current LTE substantially at present.
But along with the development of mobile communication, rely on single base station to realize performance boost more and more difficult, multi-level multi-cell cooperating treatment technology and many antennas Combined Treatment technology progressively receive people's concern.If following, adopt a plurality of RRH(Remote Radio Head, the multi-cell multi-antenna Combined Treatment networking structure of concentrated Base-Band Processing structure remote radio head), between BBU and RRU, may not only there is the transmission link of fiber direct connection, also exist by GPON(Gigabit-Capable PON, Gigabit Passive Optical Network) etc. the transmission link that backbone network connects, Fig. 3 has provided the multi-plot joint processing structural representation that a plurality of RRH form, its propagation delay time may reach 3ms, be difficult to meet the delay requirement of descending ACK/NACK feedback 4ms, between a plurality of transmission nodes, may there is delay inequality simultaneously, further strengthen the propagation delay time of descending ACK/NACK.Under the multi-plot joint treatment conditions that form in many base stations in addition, as shown in Figure 4, when the data of base station 2 and base station 3 need to send to base station 1 to do Combined Treatment, need to transmit data by X2 interface, now in real network, be difficult to possess direct-connected fiber resource between base station, the data of base station 2 and base station 3 need to be transmitted by backbone network (time delay 3ms left and right), if base station 1 need to be waited for the data of base station 2 and 3 and be combined data processing, the ACK/NACK(PHICH channel of the PUSCH information sending for uplink UE so) feedback is difficult to meet the time-constrain that 4ms sends.
Due in the prior art, the time slot between UE up PUSCH data transmitting time and base station down feedback information (PHICH) is fixed, and differs 4ms interval.Therefore, fixing interval constraint the deployment scenario of FDD-LTE network in the many communities of multilayer extensive antenna Combined Treatment technology application.
Summary of the invention
The technical problem to be solved in the present invention is to provide the methods, devices and systems of mixed automatic retransfer in a kind of FDD-LTE network.By the feedback information transmitting time of PUSCH information being offered to user terminal by base station, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
According to an aspect of the present invention, provide the method for mixed automatic retransfer in a kind of FDD-LTE network, comprising:
Configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal;
At i descending sub frame, to user terminal, send indication information, wherein indication information comprises Transmission Time Interval k;
On i+4 sub-frame of uplink, receive the PUSCH information that user terminal sends;
Judge whether described PUSCH information occurs mistake;
On i+4+k descending sub frame, to user terminal, send PHICH information, wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message;
If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends.
According to a further aspect in the invention, provide the method for mixed automatic retransfer in a kind of FDD-LTE network, comprising:
When receiving the indication information of base station transmission at i descending sub frame, from described indication information, extract Transmission Time Interval k, wherein Transmission Time Interval k is configured by base station, for base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal;
On i+4 sub-frame of uplink, to base station, send PUSCH information;
On i+4+k descending sub frame, receive the PHICH information that base station sends, wherein base station is when there is mistake in the described PUSCH information of judgement, and PHICH information comprises negative acknowledgment message;
Judge and in PHICH information, whether comprise negative acknowledgment message;
If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information.
According to a further aspect in the invention, provide the base station of mixed automatic retransfer in a kind of FDD-LTE network, comprising:
Dispensing unit, for configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal;
The first transmitting element, for sending indication information at i descending sub frame to user terminal, wherein indication information comprises Transmission Time Interval k; According to the indication of the first recognition unit, on i+4+k descending sub frame, to user terminal, send PHICH information;
The first receiving element, the PUSCH information sending for receive user terminal on i+4 sub-frame of uplink; According to the indication of the first recognition unit, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends;
The first recognition unit, for judging whether described PUSCH information occurs mistake, and indicates the first transmitting element to user terminal, to send PHICH information on i+4+k descending sub frame; Wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message, and indicates the first receiving element on i+4+k+4 sub-frame of uplink, to receive the described PUSCH information that user terminal resends.
According to a further aspect in the invention, provide the user terminal of mixed automatic retransfer in a kind of FDD-LTE network, comprising:
The second receiving element, be used for when i descending sub frame receives the indication information of base station transmission, indication extraction unit extracts Transmission Time Interval k from described indication information, wherein Transmission Time Interval k is configured by base station, for base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal; According to the indication of the second transmitting element, on i+4+k descending sub frame, receive the PHICH information that base station sends, indicate the second recognition unit to judge and in PHICH information, whether comprise negative acknowledgment message, wherein base station is when there is mistake in the described PUSCH information of judgement, and PHICH information comprises negative acknowledgment message;
Extraction unit, for extracting Transmission Time Interval k from described indication information;
The second transmitting element, for sending PUSCH information on i+4 sub-frame of uplink to base station; And indicate the second receiving element on i+4+k descending sub frame, to receive the PHICH information that base station sends; According to the indication of the second recognition unit, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information;
The second recognition unit, for according to the indication of the second receiving element, judges in PHICH information, whether to comprise negative acknowledgment message; If PHICH information comprises negative acknowledgment message, indicate the second transmitting element on i+4+k+4 sub-frame of uplink, to base station, to resend described PUSCH information.
According to a further aspect in the invention, provide the system of mixed automatic retransfer in a kind of FDD-LTE network, comprise base station and user terminal, wherein:
Base station, for configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal; At i descending sub frame, to user terminal, send indication information, wherein indication information comprises Transmission Time Interval k; On i+4 sub-frame of uplink, receive the PUSCH information that user terminal sends; Judge whether described PUSCH information occurs mistake; On i+4+k descending sub frame, to user terminal, send PHICH information, wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message; If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends;
User terminal, for when receiving the indication information of base station transmission at i descending sub frame, from described indication information, extract Transmission Time Interval k, on i+4 sub-frame of uplink, to base station, send PUSCH information, on i+4+k descending sub frame, receive the PHICH information that base station sends, judge in PHICH information whether comprise negative acknowledgment message, if PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information.
The present invention offers user terminal by base station by the feedback information transmitting time of PUSCH information, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the sequential chart of HARQ in prior art.
Fig. 2 is the schematic flow sheet that in prior art, HARQ processes.
Fig. 3 is the structural representation of the multi-plot joint processing that in prior art, a plurality of RRH form.
Fig. 4 is the structural representation of the multi-plot joint processing that in prior art, many base stations form.
Fig. 5 is the schematic diagram of an embodiment of mixed automatic retransferring method in FDD-LTE network of the present invention.
Fig. 6 is the schematic diagram of an embodiment of configuring transmission time interval of the present invention.
Fig. 7 is the schematic diagram of another embodiment of mixed automatic retransferring method in FDD-LTE network of the present invention.
Fig. 8 is the schematic diagram of the embodiment in mixed automatic retransfer base station in FDD-LTE network of the present invention.
Fig. 9 is the schematic diagram of an embodiment of dispensing unit of the present invention.
Figure 10 is the schematic diagram of an embodiment of mixed automatic retransfer user terminal in FDD-LTE network of the present invention.
Figure 11 is the schematic diagram of an embodiment of mixed automatic retransfer system in FDD-LTE network of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.To the description only actually of at least one exemplary embodiment, be illustrative below, never as any restriction to the present invention and application or use.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Unless illustrate in addition, otherwise the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step not limited the scope of the invention.
, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not to draw according to actual proportionate relationship meanwhile.
For the known technology of person of ordinary skill in the relevant, method and apparatus, may not discuss in detail, but in suitable situation, described technology, method and apparatus should be regarded as authorizing a part for specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: in similar label and letter accompanying drawing below, represent similar terms, therefore, once be defined in an a certain Xiang Yi accompanying drawing, in accompanying drawing subsequently, do not need it to be further discussed.
Fig. 5 is the schematic diagram of an embodiment of mixed automatic retransferring method in FDD-LTE network of the present invention.Preferably, this embodiment can be carried out by base station.
Step 501, configuring transmission time interval k.
Wherein Transmission Time Interval k is that base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal.
Step 502, sends indication information at i descending sub frame to user terminal, and wherein indication information comprises Transmission Time Interval k.
Step 503 receives the PUSCH information that user terminal sends on i+4 sub-frame of uplink.
Step 504, judges whether described PUSCH information occurs mistake.
Step 505 sends PHICH information to user terminal on i+4+k descending sub frame.
Wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message.
Step 506 if PHICH information comprises negative acknowledgment message, receives the described PUSCH information that user terminal resends on i+4+k+4 sub-frame of uplink.
The mixed automatic retransferring method providing based on the above embodiment of the present invention, base station offers user terminal by the transmitting time of PHICH information, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
Preferably, the step of above-mentioned configuring transmission time interval k comprises:
By the predetermined time interval k being associated with base station type
0as Transmission Time Interval k.
Base station type and predetermined time interval k have been provided to table 1 exemplary
0corresponding relation.
Table 1
Preferably, above-mentioned by the predetermined time interval k being associated with base station type
0as the step of Transmission Time Interval k further as shown in Figure 6:
Step 601, judges whether user terminal is first transmission.If described user terminal is first transmission, perform step 602; If described terminal is not first transmission, perform step 603.
Step 602, by the predetermined time interval k being associated with base station type
0as Transmission Time Interval k.Afterwards, no longer carry out other step of the present embodiment.
Step 603, judges whether base station uplink transmission resource utilance is greater than utilance threshold value.If base station uplink transmission resource utilance is greater than utilance threshold value, execution step 604; If base station uplink transmission resource utilance is not more than utilance threshold value, execution step 605.
Step 604, is greater than accuracy threshold value and the Transmission Time Interval k that configured is less than the time interval during threshold value in the upstream data accuracy of user terminal, increases the Transmission Time Interval k having configured; In the upstream data accuracy of user terminal, be not more than accuracy threshold value and the Transmission Time Interval k that configured is greater than predetermined time interval k
0time, the Transmission Time Interval k having configured is made as to predetermined time interval k
0.At upstream data accuracy and the Transmission Time Interval k that configured, during in other situation, do not adjust the Transmission Time Interval k having configured.Afterwards, no longer carry out other step of the present embodiment.
Step 605, does not adjust the Transmission Time Interval k having configured.
For example,, if base station uplink transmission resource utilance >=70%, when the transmitting uplink data accuracy >95% of user terminal and k≤20ms, can increase the 4ms time on the transmitting time k basis of current ACK/NACK.If user terminal transmitting uplink data accuracy <95% and k>k
0time, the transmitting time k of current ACK/NACK is set to initial time k
0.
Fig. 7 is the schematic diagram of another embodiment of mixed automatic retransferring method in FDD-LTE network of the present invention.Preferably, the method step of this embodiment is carried out by user terminal.
Step 701 when receiving the indication information of base station transmission at i descending sub frame, is extracted Transmission Time Interval k from described indication information.
Wherein Transmission Time Interval k is configured by base station, for base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal.
Step 702 sends PUSCH information on i+4 sub-frame of uplink to base station.
Step 703 receives the PHICH information that base station sends on i+4+k descending sub frame.
Wherein base station is when there is mistake in the described PUSCH information of judgement, and PHICH information comprises negative acknowledgment message.
Step 704, judges in PHICH information, whether to comprise negative acknowledgment message.
Step 705 if PHICH information comprises negative acknowledgment message, resends described PUSCH information on i+4+k+4 sub-frame of uplink to base station.
The mixed automatic retransferring method providing based on the above embodiment of the present invention, base station offers user terminal by the transmitting time of PHICH information, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
Fig. 8 is the schematic diagram of the embodiment in mixed automatic retransfer base station in FDD-LTE network of the present invention.As shown in Figure 8, base station comprises:
Dispensing unit 801, for configuring transmission time interval k.
Wherein Transmission Time Interval k is that base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal.
The first transmitting element 802, for sending indication information at i descending sub frame to user terminal, wherein indication information comprises Transmission Time Interval k; According to the indication of the first recognition unit 804, on i+4+k descending sub frame, to user terminal, send PHICH information.
The first receiving element 803, the PUSCH information sending for receive user terminal on i+4 sub-frame of uplink; According to the indication of the first recognition unit 804, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends;
The first recognition unit 804, for judging whether described PUSCH information occurs mistake, and indicates the first transmitting element 802 to user terminal, to send PHICH information on i+4+k descending sub frame; Wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message, and indicates the first receiving element 803 on i+4+k+4 sub-frame of uplink, to receive the described PUSCH information that user terminal resends.
The base station providing based on the above embodiment of the present invention, by the transmitting time of PHICH information is offered to user terminal, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
Preferably, dispensing unit 801 is also for by the predetermined time interval k being associated with base station type
0as Transmission Time Interval k.
Fig. 9 is the schematic diagram of an embodiment of dispensing unit of the present invention.As shown in Figure 9, dispensing unit 801 also comprises the first judge module 901, the second judge module 902, the 3rd judge module 903 and configuration module 904.Wherein:
The first judge module 901, for judging whether described user terminal is first transmission.
The second judge module 902, for according to the judged result of the first judge module 901, if described terminal is not first transmission, judges whether base station uplink transmission resource utilance is greater than utilance threshold value.
The 3rd judge module 903, be used for according to the judged result of the second judge module 902, if base station uplink transmission resource utilance is greater than utilance threshold value, whether the upstream data accuracy that judges user terminal is greater than accuracy threshold value and whether the Transmission Time Interval k that configured is less than time interval threshold value.
Configuration module 904, for according to the judged result of the first judge module 901, if described user terminal is first transmission, by the predetermined time interval k being associated with base station type
0as Transmission Time Interval k; According to the judged result of the 3rd judge module 903, if the upstream data accuracy of user terminal is greater than accuracy threshold value and the Transmission Time Interval k that configured is less than time interval threshold value, increase the Transmission Time Interval k having configured; If the upstream data accuracy of user terminal is not more than accuracy threshold value and the Transmission Time Interval k that configured is greater than predetermined time interval k
0time, the Transmission Time Interval k having configured is made as to predetermined time interval k
0.
Preferably, in the second judge module 902 judgement base station uplink transmission resource utilances, be not more than utilance threshold value, or when the 3rd judge module 903 judges that the upstream data accuracy of user terminals and the Transmission Time Interval k having configured are other situation outside above-mentioned situation, can not adjust the Transmission Time Interval k having configured.
Thereby base station can dynamically be adjusted Transmission Time Interval k according to base station busy extent and active user's terminal transmitting uplink data accuracy.
Figure 10 is the schematic diagram of an embodiment of mixed automatic retransfer user terminal in FDD-LTE network of the present invention.As shown in figure 10.User terminal comprises:
The second receiving element 1001, be used for when i descending sub frame receives the indication information of base station transmission, indication extraction unit 1002 extracts Transmission Time Interval k from described indication information, wherein Transmission Time Interval k is configured by base station, for base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal; According to the indication of the second transmitting element 1003, on i+4+k descending sub frame, receive the PHICH information that base station sends, indicate the second recognition unit 1004 to judge and in PHICH information, whether comprise negative acknowledgment message, wherein base station is when there is mistake in the described PUSCH information of judgement, and PHICH information comprises negative acknowledgment message.
Extraction unit 1002, for extracting Transmission Time Interval k from described indication information.
The second transmitting element 1003, for sending PUSCH information on i+4 sub-frame of uplink to base station; And indicate the second receiving element 1001 on i+4+k descending sub frame, to receive the PHICH information that base station sends; According to the indication of the second recognition unit 1004, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information.
The second recognition unit 1004, for according to the indication of the second receiving element 1001, judges in PHICH information, whether to comprise negative acknowledgment message; If PHICH information comprises negative acknowledgment message, indicate the second transmitting element 1003 on i+4+k+4 sub-frame of uplink, to base station, to resend described PUSCH information.
The user terminal providing based on the above embodiment of the present invention, by base station, the transmitting time of PHICH information is offered to user terminal, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
Figure 11 is the schematic diagram of an embodiment of mixed automatic retransfer system in FDD-LTE network of the present invention.As shown in figure 11, this system comprises base station 1101 and user terminal 1102.Wherein:
Base station 1101, for configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between PHICH information in the PUSCH information and the base station that receive user terminal transmission to described user terminal; At i descending sub frame, to user terminal, send indication information, wherein indication information comprises Transmission Time Interval k; On i+4 sub-frame of uplink, receive the PUSCH information that user terminal sends; Judge whether described PUSCH information occurs mistake; On i+4+k descending sub frame, to user terminal, send PHICH information, wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message; If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends;
User terminal 1102, for when receiving the indication information of base station transmission at i descending sub frame, from described indication information, extract Transmission Time Interval k, on i+4 sub-frame of uplink, to base station, send PUSCH information, on i+4+k descending sub frame, receive the PHICH information that base station sends, judge in PHICH information whether comprise negative acknowledgment message, if PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information.
The user terminal providing based on the above embodiment of the present invention, by base station, the transmitting time of PHICH information is offered to user terminal, so that user terminal is at corresponding moment receiving feedback information, thereby realize flexible dispatching and the deployment of PHICH access time, make LTE support more flexibly the application scenarios of multilayer/many communities extensive antenna Combined Treatment technology.
For brevity, in Figure 11, only show a user terminal.Those skilled in the art are scrutable, can have a plurality of user terminals and base station to carry out alternately.
Preferably, base station is the base station that in Fig. 8 or Fig. 9, arbitrary embodiment relates to, and user terminal is the base station relating in embodiment illustrated in fig. 10.
Preferably, base station is by PDCCH(Physical Downlink Control Channel, Physical Downlink Control Channel) the DCI(Downlink Control Information in information, Downlink Control Information) signaling, or by RRC(Radio Resource Control, Radio Resource is controlled) signaling sends to user terminal by Transmission Time Interval k.
Below by specific embodiment, the present invention will be further described.
Embodiment 1:
Revise DCI signaling, utilizing the vacant UL index(2 bit of FDD LTE in DCI0) item indicates the delivery time of the descending PHICH information of FDD LTE, carry out flexibly descending PHICH delivery time configuration, 2bit value is 00(k=4ms), 01(k=6ms), 10(k=8ms), 11(k=12ms or reserved), thus make the transmission delay of PHICH information support respectively 4ms, 6ms, 8ms, 12ms etc.
Embodiment 1 flow process is as follows:
Step 1: when base station is configured, first judge whether active user's terminal is initial transmission, if judgement user terminal is uplink first, the transmitting time k=k of user terminal upstream data feedback information ACK/NACK, according to base station type (as above-mentioned table 1), is selected in base station
0, and enter step 5.If judgement user terminal is not uplink first, base station judges whether to meet the following conditions: base station uplink transmission resource utilance >=70%, user terminal transmitting uplink data accuracy >95% and k≤20ms.If so, perform step 2; Otherwise, execution step 3.
Step 2: increase the 4ms time on the transmitting time k basis of current ACK/NACK, then perform step 5.
Step 3: base station judges whether base station uplink transmission resource utilance>=70%, user terminal transmitting uplink data accuracy <95% and k>k
0.If so, perform step 4; Otherwise, execution step 5.
Step 4: the transmitting time k of current ACK/NACK is set to initial time k
0.
Step 5: base station is by above-mentioned vacant UL index item in DCI0 is configured, the transmitting time k of pointer to ACK/NACK information corresponding to the up PUSCH data of user terminal.
Step 6: user terminal detects descending PDCCH information i subframe, and resolve DCI0, obtain upstream data and send resource location, the contents such as modulation coding mode, and by detecting the transmitting time k of ACK/NACK information corresponding to the up PUSCH data of UL index item acquisition user terminal, transmission data are recorded to the HARQ queue of subframe i.
Step 7: user terminal sends PUSCH data on i+4 sub-frame of uplink, and at i+4+k descending sub frame, detect PHICH information according to the k indicating in DCI0.
Step 8: base station is detected after i+4 subframe receives the up PUSCH information of user terminal, and feedback information is sent by PHICH channel on i+4+k descending sub frame.
Step 9: user terminal is the corresponding PHICH channel of base stations detected on i+4+k descending sub frame, judges whether to retransmit the HARQ data message in subframe i queue according to ACK/NACK content.
Embodiment 2:
Revise DCI signaling, in DCI0, newly increase a PHICH Timing(2 bit) be used to indicate PHICH delivery time, this value implication is with embodiment 1, and this embodiment flow process is with the flow process of embodiment 1.
Embodiment 3:
Revise RRC signaling, for example, in RRC signaling, newly increase a ul-SCH-Config, increase therein HARQ-Timing value ENUMERATED { 4,6,8,12 }, be used to indicate the PHICH information delivery time of corresponding PUSCH information.In RACH-ConfigCommon, increase HARQ-Msg3Timing value ENUMERATED { 4,6,8,12 }, be used to indicate the ACK/NACK delivery time of corresponding Message3.
In embodiment 3, the HARQ flow process of PUSCH information is as follows:
Step 1: when base station is configured, first judge whether active user's terminal is initial transmission, if judgement user terminal is uplink first, the transmitting time k=k of user terminal upstream data feedback information ACK/NACK, according to base station type (as above-mentioned table 1), is selected in base station
0, enter step 5.If judgement user terminal is not uplink first, base station judges whether to meet the following conditions: base station uplink transmission resource utilance >=70%, user terminal transmitting uplink data accuracy >95% and k≤20ms.If so, perform step 2; Otherwise, execution step 3.
Step 2: increase the 4ms time on the transmitting time k basis of current ACK/NACK, then perform step 5.
Step 3: base station judges whether base station uplink transmission resource utilance>=70%, user terminal transmitting uplink data accuracy <95% and k>k
0.If so, perform step 4; Otherwise, execution step 5;
Step 4: the transmitting time k of current ACK/NACK is set to initial time k
0.
Step 5: base station is by HARQ-Timing in RRC signaling RRCConnectionReconfiguration is configured, the transmitting time k of the ACK/NACK information that the up PUSCH data of indicating user terminal are corresponding.
Step 6: base station sends upstream data i subframe by DCI0 scheduling user terminal.
Step 7: user terminal detects RRCConnectionReconfiguration item in RRC signaling, obtains the transmitting time k of ACK/NACK information corresponding to the up PUSCH data of user terminal by detecting HARQ-Timing item.
Step 8: user terminal detects descending PDCCH information i subframe, and resolve DCI0, obtain upstream data and send the contents such as resource location, modulation coding mode, transmission data are recorded to the HARQ queue of subframe i.
Step 9: user terminal sends PUSCH data on i+4 sub-frame of uplink, and at i+4+k descending sub frame, detect PHICH information according to the k indicating in HARQ-Timing.
Step 10: base station is detected after i+4 subframe receives the up PUSCH information of user terminal, and feedback information is sent by PHICH channel on i+4+k descending sub frame.
Step 11: user terminal is the corresponding PHICH channel of base stations detected on i+4+k descending sub frame, judges whether to retransmit the HARQ data message in descending sub frame i queue according to ACK/NACK content.
HARQ flow process to Message3 in embodiment 3 is as follows:
Step 1: when base station is configured, first judge whether active user's terminal is initial transmission, if judgement user terminal is uplink first, the transmitting time k=k of user terminal upstream data feedback information ACK/NACK, according to base station type (as above-mentioned table 1), is selected in base station
0, enter step 5.If judgement user terminal is not uplink first, base station judges whether to meet the following conditions: base station uplink transmission resource utilance >=70%, UE transmitting uplink data accuracy >95% and k≤20ms.If so, perform step 2; Otherwise, execution step 3.
Step 2: increase the 4ms time on the transmitting time k basis of current ACK/NACK, then perform step 5.
Step 3: base station judges whether base station uplink transmission resource utilance>=70%, user terminal transmitting uplink data accuracy <95% and k>k
0.If so, perform step 4; Otherwise, execution step 5.
Step 4: the transmitting time k of current ACK/NACK is set to initial time k
0.
Step 5: base station is by HARQ-Msg3Timing in system message SystemInformationBlockType2 is configured, the downstream feedback ACK/NACK transmitting time k that the up Msg3 information of indicating user terminal is corresponding.
Step 6: user terminal to read system information SystemInformationBlockType2, and resolve HARQ-Msg3Timing, obtain the transmitting time k of downstream feedback ACK/NACK information corresponding to the up Msg3 data of user terminal.
Step 7: in user terminal random access procedure, if user terminal sends Msg3 data on i sub-frame of uplink, prepare to receive downstream feedback ACK/NACK data i+k subframe.
Step 8: base station is detected after i subframe receives the up Msg3 information of user terminal, and feedback information is sent by PHICH channel on i+k descending sub frame.
Step 9: user terminal is the corresponding PHICH channel of base stations detected on i+k descending sub frame, judges whether to retransmit the Msg3 data message in sub-frame of uplink i queue according to ACK/NACK content.
The relative prior art of this patent, change in existing FDD-LTE system base station and need to send the ascending HARQ transmission means of up PUSCH information feedback information at fixing time slot, base station is by the sending time slots of the descending PHICH channel of signaling user terminal, increase the adaptive capacity of LTE base station deployment to return link, and support multilayer multi-plot joint processing mode more flexibly.By base station, dynamically adjust descending ACK/NACK transmitting time, in the busy moment of system, can reduce the expense that retransmits signaling.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can come the hardware that instruction is relevant to complete by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment with various modifications that the present invention's design is suitable for special-purpose.
Claims (10)
1. a method for mixed automatic retransfer in FDD-LTE network, is characterized in that:
Configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between physical mixing retransmission indicating chanel PHICH information in the physical uplink link sharing channel PUSCH information and the base station that receive user terminal transmission to described user terminal;
At i descending sub frame, to user terminal, send indication information, wherein indication information comprises Transmission Time Interval k;
On i+4 sub-frame of uplink, receive the PUSCH information that user terminal sends;
Judge whether described PUSCH information occurs mistake;
On i+4+k descending sub frame, to user terminal, send PHICH information, wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message;
If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends.
2. method according to claim 1, is characterized in that,
The step of configuring transmission time interval k comprises:
By the predetermined time interval k being associated with base station type
0as Transmission Time Interval k.
3. method according to claim 2, is characterized in that,
By the predetermined time interval k being associated with base station type
0step as Transmission Time Interval k comprises:
If described user terminal is first transmission, by the predetermined time interval k being associated with base station type
0as Transmission Time Interval k;
If described terminal is not first transmission, judge whether base station uplink transmission resource utilance is greater than utilance threshold value;
If base station uplink transmission resource utilance is greater than utilance threshold value, and be greater than accuracy threshold value and the Transmission Time Interval k that configured is less than the time interval during threshold value in the upstream data accuracy of user terminal, increase the Transmission Time Interval k having configured;
If base station uplink transmission resource utilance is greater than utilance threshold value, and be not more than accuracy threshold value and the Transmission Time Interval k that configured is greater than predetermined time interval k in the upstream data accuracy of user terminal
0time, the Transmission Time Interval k having configured is made as to predetermined time interval k
0.
4. a method for mixed automatic retransfer in FDD-LTE network, is characterized in that:
When receiving the indication information of base station transmission at i descending sub frame, from described indication information, extract Transmission Time Interval k, wherein Transmission Time Interval k is configured by base station, for base station sends the time interval between physical mixing retransmission indicating chanel PHICH information in the physical uplink link sharing channel PUSCH information and the base station that receive user terminal transmission to described user terminal;
On i+4 sub-frame of uplink, to base station, send PUSCH information;
On i+4+k descending sub frame, receive the PHICH information that base station sends, wherein base station is when there is mistake in the described PUSCH information of judgement, and PHICH information comprises negative acknowledgment message;
Judge and in PHICH information, whether comprise negative acknowledgment message;
If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information.
5. a base station for mixed automatic retransfer in FDD-LTE network, is characterized in that, comprising:
Dispensing unit, for configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between physical mixing retransmission indicating chanel PHICH information in the physical uplink link sharing channel PUSCH information and the base station that receive user terminal transmission to described user terminal;
The first transmitting element, for sending indication information at i descending sub frame to user terminal, wherein indication information comprises Transmission Time Interval k; According to the indication of the first recognition unit, on i+4+k descending sub frame, to user terminal, send PHICH information;
The first receiving element, the PUSCH information sending for receive user terminal on i+4 sub-frame of uplink; According to the indication of the first recognition unit, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends;
The first recognition unit, for judging whether described PUSCH information occurs mistake, and indicates the first transmitting element to user terminal, to send PHICH information on i+4+k descending sub frame; Wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message, and indicates the first receiving element on i+4+k+4 sub-frame of uplink, to receive the described PUSCH information that user terminal resends.
6. base station according to claim 5, is characterized in that:
Dispensing unit is also for by the predetermined time interval k being associated with base station type
0as Transmission Time Interval k.
7. base station according to claim 6, is characterized in that, dispensing unit also comprises the first judge module, the second judge module, the 3rd judge module, configuration module, wherein:
The first judge module, for judging whether described user terminal is first transmission;
The second judge module, for according to the judged result of the first judge module, if described terminal is not first transmission, judges whether base station uplink transmission resource utilance is greater than utilance threshold value;
The 3rd judge module, be used for according to the judged result of the second judge module, if base station uplink transmission resource utilance is greater than utilance threshold value, whether the upstream data accuracy that judges user terminal is greater than accuracy threshold value and whether the Transmission Time Interval k that configured is less than time interval threshold value;
Configuration module, for according to the judged result of the first judge module, if described user terminal is first transmission, by the predetermined time interval k being associated with base station type
0as Transmission Time Interval k; According to the judged result of the 3rd judge module, if the upstream data accuracy of user terminal is greater than accuracy threshold value and the Transmission Time Interval k that configured is less than time interval threshold value, increase the Transmission Time Interval k having configured; If the upstream data accuracy of user terminal is not more than accuracy threshold value and the Transmission Time Interval k that configured is greater than predetermined time interval k
0time, the Transmission Time Interval k having configured is made as to predetermined time interval k
0.
8. a user terminal for mixed automatic retransfer in FDD-LTE network, is characterized in that, comprising:
The second receiving element, be used for when i descending sub frame receives the indication information of base station transmission, indication extraction unit extracts Transmission Time Interval k from described indication information, wherein Transmission Time Interval k is configured by base station, for base station sends the time interval between physical mixing retransmission indicating chanel PHICH information in the physical uplink link sharing channel PUSCH information and the base station that receive user terminal transmission to described user terminal; According to the indication of the second transmitting element, on i+4+k descending sub frame, receive the PHICH information that base station sends, indicate the second recognition unit to judge and in PHICH information, whether comprise negative acknowledgment message, wherein base station is when there is mistake in the described PUSCH information of judgement, and PHICH information comprises negative acknowledgment message;
Extraction unit, for extracting Transmission Time Interval k from described indication information;
The second transmitting element, for sending PUSCH information on i+4 sub-frame of uplink to base station; And indicate the second receiving element on i+4+k descending sub frame, to receive the PHICH information that base station sends; According to the indication of the second recognition unit, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information;
The second recognition unit, for according to the indication of the second receiving element, judges in PHICH information, whether to comprise negative acknowledgment message; If PHICH information comprises negative acknowledgment message, indicate the second transmitting element on i+4+k+4 sub-frame of uplink, to base station, to resend described PUSCH information.
9. a system for mixed automatic retransfer in FDD-LTE network, is characterized in that, comprises base station and user terminal, wherein:
Base station, for configuring transmission time interval k, wherein Transmission Time Interval k is that base station sends the time interval between physical mixing retransmission indicating chanel PHICH information in the physical uplink link sharing channel PUSCH information and the base station that receive user terminal transmission to described user terminal; At i descending sub frame, to user terminal, send indication information, wherein indication information comprises Transmission Time Interval k; On i+4 sub-frame of uplink, receive the PUSCH information that user terminal sends; Judge whether described PUSCH information occurs mistake; On i+4+k descending sub frame, to user terminal, send PHICH information, wherein, when mistake appears in the described PUSCH information of judgement, PHICH information comprises negative acknowledgment message; If PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, receive the described PUSCH information that user terminal resends;
User terminal, for when receiving the indication information of base station transmission at i descending sub frame, from described indication information, extract Transmission Time Interval k, on i+4 sub-frame of uplink, to base station, send PUSCH information, on i+4+k descending sub frame, receive the PHICH information that base station sends, judge in PHICH information whether comprise negative acknowledgment message, if PHICH information comprises negative acknowledgment message, on i+4+k+4 sub-frame of uplink, to base station, resend described PUSCH information.
10. system according to claim 9, is characterized in that,
Base station is the base station that in claim 5-7, any one relates to;
User terminal is the user terminal that claim 8 relates to.
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