CN103825686A - Device and method for configuring LTE terminal uplink retransmission scheduling - Google Patents
Device and method for configuring LTE terminal uplink retransmission scheduling Download PDFInfo
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Abstract
The invention provides a device and method for configuring LTE terminal uplink retransmission scheduling. An LTE system includes a network side. The device includes a reception module used for receiving uplink data and uplink demodulating reference signals, which are sent by a terminal; a first judgment module used for judging whether the uplink data is uplink data, the redundant version number of which is 0; a second judgment module used for judging whether the unlink demodulating reference signals have a signal power and signal correlation peak; a first processing module used for executing a prior technical process; a second processing module used for discarding the uplink data; and a third processing module used for scheduling self-adaptive retransmission at the network side. Under a condition that the terminal misses detection of unlink scheduling control information during initial transmission, the network side decides the configuration for scheduling resource retransmission through detection on the uplink demodulation reference signals.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of device and method that configures the scheduling of LTE terminal uplink retransmission.
Background technology
At LTE(Long Term Evolution, Long Term Evolution) in system, uplink scheduling has network side to control.Network side is given the terminal transmission scheduling control information of specifying in control channel, and described terminal must received after the control information of network side scheduling, could on the running time-frequency resource of specifying, send data.
In LTE system, uplink adopts synchronous hybrid automatic repeat request mechanism (Hybrid Automatic Repeat reQuest, HARQ), and HARQ mechanism comprises two types: adaptive retransmission and non-self-adapting retransmit.Network side can be chosen in when feedback retransmits and reconfigure running time-frequency resource and the redundant version number that terminal transmission is used, and also can allow terminal continue to use running time-frequency resource and the redundant version number of last time.
Further, HARQ mechanism comprises two parts: forward error correction coding (Forward Error Correction, FEC) and HARQ (Automatic Repeat reQuest, ARQ).Wherein, the chnnel coding of LTE system shared channel is taked Turbo coding, according to 1/3 code check coding, after having encoded, say that bit stream deposits in circulating register (Buffer), 4 Along ents of getting 4 buffer carry out the original position of rate-matched as 4 redundancy versions, wherein, in redundant version number 0, be information bit, check bit not in all the other version numbers.In addition, wait for the time of feedback message for ease of realizing and avoiding waste, LTE selects the stop-and-wait protocol (STOP-and-WAIT, SAW) of N task parallelism, be that multiple HARQ task parallelisms move to transmit data, each process is independent of each other to make full use of running time-frequency resource.
As shown in Figure 1, it is HARQ mechanism circular buffer schematic diagram.Utilize HARQ mechanism, when original position is chosen in first biography, transmit more information bit, and in the time retransmitting, select the more check bit of transmission, realized incremental redundancy technology.By this method, LTE system can average out between the efficiency of transmission and reliability.Preferably, transfer check bit and initial transmission data are carried out the decoding ratio of gains that soft merging brings and are retransmitted primary data and carry out the simple decoding merging and gain high when retransmitting, in prior art, generally select according to redundant version number { 0,2, the order of 3,1} sends data, to obtain higher merging gain.
In prior art, when the transmission of network side dispatching uplink, adopt following 3 kinds of modes:
1, by Downlink Control Information(DIC Format 0) Physical Uplink Control Channel (Physical Uplink Control Channel, PUCCH) dispatching uplink transmission, modulation coding mode (MCS value) is wherein less than 29, terminal can directly obtain scheduling mode by MCS value like this, obtains transmission block size in conjunction with time-frequency resource allocating simultaneously.The DIC Format 0 that is less than 29 for MCS value, the redundant version number of its scheduling is fixed as 0, and this scheduling mode is applied to the transmission of new data.
2, by the PUCCH dispatching uplink transmission of DIC Format 0, MCS value is wherein 29,30 and 31, and the corresponding redundant version number of these three values is 2,3,4.DIC Format 0 in this case does not indicate scheduling mode and transmission block size, terminal is the last scheduling mode and transmission block size, is less than the scheduling mode and the transformation parameter of transmission block size as this transmission use of indication in 29 DIC Format 0 in MCS value.This scheduling mode is applied to the adaptive retransmission of data.
3, by the HI message scheduling uplink in Physical HARQ Indicator Channel (Physical Hybrid ARQ Indicator Channel, PHICH), in this scheduling mode, terminal only obtains transmission indication, there is no other schedule information.In the situation that not considering frequency hopping, terminal is the last scheduling mode and transmission block size, is less than the scheduling mode and the transformation parameter of transmission block size as this transmission use of indication in 29 DICFormat 0 in MCS value.The redundant version number of transmission is according to the redundant version number of transmission last time, according to { order of 0,2,3,1} is transmitted successively.The non-self-adapting that this scheduling mode is applied to data retransmits.
As shown in Figure 2, in the implementation procedure of prior art, in the time retransmitting, network side generally adopts mode 2 and mode 3.Can obtain higher merging gain by the different redundancy versions of transmission like this.If terminal is undetected uplink scheduling control information in the time of initial transmission, network side will configure re-transmission according to mode 2 or mode 3.Further, if terminal undetected uplink scheduling control information in the time of initial transmission, terminal is using the transformation parameter that adopts the last scheduling mode and transmission block size to use as this transmission, even if MCS value may be wrong so.The data that send according to this wrong way do not meet the expection of network side certainly, can not be by demodulation codings correctly, thus make initial undetected error pollute the data that retransmit.If according to the flow process of prior art, this mistake will extend to terminal always and send data to maximum retransmission, if due to terminal undetected uplink scheduling control information when the initial transmission, till the transfer of data that causes HARQ passage is blocked and arrived maximum retransmission and empty HARQ Buffer to terminal always.
Summary of the invention
The device and method that the object of the present invention is to provide the scheduling of a kind of LTE of configuration terminal uplink retransmission to be to solve in prior art due to terminal undetected uplink scheduling control information when the initial transmission, thereby causes the transfer of data of HARQ passage to block the problem that arrives maximum retransmission and empty HARQ Buffer to terminal always.
For solving the problems of the technologies described above, the invention provides:
A device that configures the scheduling of LTE terminal uplink retransmission, described LTE system comprises network side, comprising:
Receiver module, the upstream data and the uplink demodulation reference signal that send in order to receiving terminal;
The first judge module, receives the data of described receiver module, in order to judge whether described upstream data is that redundant version number is 0 upstream data;
The second judge module, receives described the first judge module and judges that described upstream data is that redundant version number is the signal of 0 upstream data, in order to judge whether uplink demodulation reference signal has signal power and signal correction peak;
The first processing module, receive described the first judge module and judge that described upstream data is not that redundant version number is the signal of 0 upstream data or receives described the second judge module and judge that uplink demodulation reference signal has the signal at signal power and signal correction peak, in order to carry out prior art flow process;
The second processing module, receives described the second judge module and judges that uplink demodulation reference signal does not have the signal at signal power and signal correction peak, in order to abandon described upstream data;
The 3rd processing module, receives the signal of described the second processing module, in order to network side scheduling adaptive retransmission.
Optionally, in the device of described configuration LTE terminal uplink retransmission scheduling, the device of described configuration LTE terminal uplink retransmission scheduling also comprises:
Channel estimation module, receives the data of described receiver module, in order to carry out the channel estimating of described upstream data.
Optionally, in the device of described configuration LTE terminal uplink retransmission scheduling, the device of described configuration LTE terminal uplink retransmission scheduling also comprises:
The 3rd judge module, receives described the second judge module and judges that uplink demodulation reference signal does not have the signal at signal power and signal correction peak, in order to judge the control information that whether has sent terminal to report on row control channel physically.
Optionally, in the device of described configuration LTE terminal uplink retransmission scheduling, the schedule information of described the 3rd processing module configuration is the data content identical with initial transmission.
Configure a method for LTE terminal uplink retransmission scheduling, use the device of described configuration LTE terminal uplink retransmission scheduling, comprising:
The upstream data that receiving terminal sends, and receive uplink demodulation reference signal;
Judge whether described upstream data is that redundant version number is 0 upstream data;
If described upstream data redundant version number is 0, judge whether uplink demodulation reference signal has signal power and signal correction peak;
If described upstream data redundant version number is not 0, carry out prior art flow process;
If uplink demodulation reference signal has signal power and signal correction peak, carry out prior art flow process;
If uplink demodulation reference signal does not have signal power and signal correction peak, abandon described upstream data;
Network side scheduling adaptive retransmission.
Optionally, in the method for described configuration LTE terminal uplink retransmission scheduling, after judging whether uplink demodulation reference signal has signal power and signal correction peak, carry out following steps: judge the control information that whether has sent terminal to report on row control channel physically.
Optionally, in the method for described configuration LTE terminal uplink retransmission scheduling, the schedule information of described network side configuration is the data content identical with initial transmission.
Device and method in a kind of LTE of configuration terminal uplink retransmission scheduling provided by the invention has following beneficial effect: the uplink scheduling control information in terminal when undetected initial transmission, network side, by uplink demodulation reference signal is detected, determines the configuration of retransfer scheduling resource.The impact that uplink scheduling control information when the present invention has reduced undetected initial transmission brings, has shortened the time that data are successfully transmitted, and due to the shortening in transmission time, the data throughout of up link has also obtained raising.Meanwhile, because number of retransmissions has reduced, under the data qualification of transmission equivalent, the power consumption of terminal also decreases.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is existing mixed automatic retransmission request mechanism circular buffer schematic diagram;
Fig. 2 is the schematic flow sheet of the configuration LTE terminal uplink retransmission dispatching method of prior art;
Fig. 3 is the module diagram of the configuration LTE terminal uplink retransmission dispatching device of the embodiment of the present invention;
Fig. 4 is the schematic flow sheet of the configuration LTE terminal uplink retransmission dispatching method of the embodiment of the present invention;
Embodiment
The device and method of a kind of LTE of configuration terminal uplink retransmission scheduling the present invention being proposed below in conjunction with the drawings and specific embodiments is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 3, it is the module diagram of the configuration LTE terminal uplink retransmission dispatching device of the embodiment of the present invention.As shown in Figure 3, a kind of device that configures the scheduling of LTE terminal uplink retransmission, described LTE system comprises network side, the device of described configuration LTE terminal uplink retransmission scheduling comprises:
The first judge module 31, receives the data of described receiver module, in order to judge whether described upstream data is that redundant version number is 0 upstream data;
The second judge module 32, receives described the first judge module and judges that described upstream data is that redundant version number is the signal of 0 upstream data, in order to judge whether uplink demodulation reference signal has signal power and signal correction peak;
The first processing module 33, receive described the first judge module and judge that described upstream data is not that redundant version number is the signal of 0 upstream data or receives described the second judge module and judge that uplink demodulation reference signal has the signal at signal power and signal correction peak, in order to carry out prior art flow process;
The second processing module 34, receives described the second judge module and judges that uplink demodulation reference signal does not have the signal at signal power and signal correction peak, in order to abandon described upstream data;
The 3rd processing module 35, receives the signal of described the second processing module, in order to network side scheduling adaptive retransmission.
A kind of method of the LTE of configuration terminal uplink retransmission scheduling is also provided accordingly, in the present embodiment.Please refer to Fig. 4, it is the schematic flow sheet of the configuration LTE terminal uplink retransmission dispatching method of the embodiment of the present invention.As shown in Figure 4, the step of the method for described configuration LTE terminal uplink retransmission scheduling comprises:
S40: the upstream data that receiving terminal sends, and receive uplink demodulation reference signal;
S41: judge whether described upstream data is that redundant version number is 0 upstream data;
If described upstream data redundant version number is 0,
Carry out S42: judge whether uplink demodulation reference signal has signal power and signal correction peak;
If described upstream data redundant version number is not 0,
Carry out S43: carry out prior art flow process;
If uplink demodulation reference signal has signal power and signal correction peak,
Carry out S43: carry out prior art flow process;
If uplink demodulation reference signal does not have signal power and signal correction peak,
Carry out S44: abandon described upstream data;
S45: network side scheduling adaptive retransmission.
Concrete, first, the upstream data that uses receiver module 30 receiving terminals to send, the uplink demodulation reference signal (DMRS) that receiving terminal sends simultaneously, pass through channel estimation module, described upstream data is carried out to channel estimating, and described channel estimation module can utilize network side to carry out channel estimating, obtains channel estimating information.Preferably, in this enforcement, described DMRS adopts Zadoff-Chu sequence, and it is a kind of permanent envelope zero autocorrelation sequence (CAZAC), has good auto-correlation, cross-correlation, the characteristics such as low PARP.Especially, because the translocation factor of DMRS is to issue decision by network, so under the transmission mode of multi-user's multiple-input, multiple-output (MIMO), network side can also utilize DMRS distinguish different terminals and judge whether terminal has successfully sent upstream data.
Then, use the first judge module 31 to judge whether described upstream data is that redundant version number is 0 upstream data.If described upstream data redundant version number is not 0, use the first processing module 33 to carry out prior art flow process.If described upstream data redundant version number is 0, enter next determining step.
Then, use the second judge module 32 to judge whether DMRS has signal power and signal correction peak.Under the transmission mode at multi-user's multiple-input, multiple-output (MIMO), in same running time-frequency resource, may there be multiple terminals to send data, so can not only depend on detection signal power to judge whether terminal sends data.Because it must be different that network is handed down to the cyclic shift value of the DMRS of the terminal that uses same running time-frequency resource, so also will check detection signal relevant peaks.If DMRS has signal power and signal correction peak, use the first processing module 33 to carry out prior art flow process.If DMRS does not have signal power and signal correction peak, can think terminal undetected uplink scheduling information, enter next step, use the second processing module 34 abandon described upstream data.
In addition, in other embodiments of the invention, after utilization the second judge module 32 judges whether DMRS has signal power and signal correction peak, can also use the 3rd judge module to judge physically whether sent the control information that terminal sends on row control channel (PUCCH).If have confirmation (ACK), unacknowledged information (NACK) or cqi (CQI), pre-coding matrix indication (PMI), receive interruption indication (RI) to send on sub-frame of uplink, terminal, the in the situation that of undetected survey uplink scheduling information, can send above-mentioned control information on PUCCH.Described control information on PUCCH, detected if the having signal power and signal correction peak of DMRS do not detected, can think so, terminal is undetected uplink scheduling information, network side can obtain described control information simultaneously.
Finally, use the 3rd processing module 35 to carry out network side scheduling adaptive retransmission.Retransmit in configuration scheduling time, should configure the data content identical with initial transmission, to guarantee that terminal can obtain correct MCS and can retransmission information bit.
By the combination of said structure, in the case of terminal undetected uplink scheduling control information when initial transmission, network side, by uplink demodulation reference signal is detected, determines the configuration of retransfer scheduling resource.The impact that uplink scheduling control information when the present invention has reduced undetected initial transmission brings, has shortened the time that data are successfully transmitted, and due to the shortening in transmission time, the data throughout of up link has also obtained raising.Meanwhile, because number of retransmissions has reduced, under the data qualification of transmission equivalent, the power consumption of terminal also decreases.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention, and any change, modification that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, all belong to the protection range of claims.
Claims (7)
1. a device that configures the scheduling of LTE terminal uplink retransmission, described LTE system comprises network side, it is characterized in that, comprising:
Receiver module, the upstream data and the uplink demodulation reference signal that send in order to receiving terminal;
The first judge module, receives the data of described receiver module, in order to judge whether described upstream data is that redundant version number is 0 upstream data;
The second judge module, receives described the first judge module and judges that described upstream data is that redundant version number is the signal of 0 upstream data, in order to judge whether uplink demodulation reference signal has signal power and signal correction peak;
The first processing module, receive described the first judge module and judge that described upstream data is not that redundant version number is the signal of 0 upstream data or receives described the second judge module and judge that uplink demodulation reference signal has the signal at signal power and signal correction peak, in order to carry out prior art flow process;
The second processing module, receives described the second judge module and judges that uplink demodulation reference signal does not have the signal at signal power and signal correction peak, in order to abandon described upstream data;
The 3rd processing module, receives the signal of described the second processing module, in order to network side scheduling adaptive retransmission.
2. the device of configuration LTE terminal uplink retransmission according to claim 1 scheduling, is characterized in that, the device of described configuration LTE terminal uplink retransmission scheduling also comprises:
Channel estimation module, receives the data of described receiver module, in order to carry out the channel estimating of described upstream data.
3. the device of configuration LTE terminal uplink retransmission according to claim 1 scheduling, is characterized in that, the device of described configuration LTE terminal uplink retransmission scheduling also comprises:
The 3rd judge module, receives described the second judge module and judges that uplink demodulation reference signal does not have the signal at signal power and signal correction peak, in order to judge the control information that whether has sent terminal to report on row control channel physically.
4. the device of configuration LTE terminal uplink retransmission according to claim 1 scheduling, is characterized in that, the schedule information of described the 3rd processing module configuration is the data content identical with initial transmission.
5. configure a method for LTE terminal uplink retransmission scheduling, use the device of configuration LTE terminal uplink retransmission as claimed in claim 1 scheduling, it is characterized in that, comprising:
The upstream data that receiving terminal sends, and receive uplink demodulation reference signal;
Judge whether described upstream data is that redundant version number is 0 upstream data;
If described upstream data redundant version number is 0, judge whether uplink demodulation reference signal has signal power and signal correction peak;
If described upstream data redundant version number is not 0, carry out prior art flow process;
If uplink demodulation reference signal has signal power and signal correction peak, carry out prior art flow process;
If uplink demodulation reference signal does not have signal power and signal correction peak, abandon described upstream data;
Network side scheduling adaptive retransmission.
6. the method for configuration LTE terminal uplink retransmission according to claim 5 scheduling, it is characterized in that, after judging whether uplink demodulation reference signal has signal power and signal correction peak, carry out following steps: judge the control information that whether has sent terminal to report on row control channel physically.
7. the method for configuration LTE terminal uplink retransmission according to claim 5 scheduling, is characterized in that, the schedule information of described network side configuration is the data content identical with initial transmission.
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