CN107205273B - DCI blind detection data processing method and device - Google Patents
DCI blind detection data processing method and device Download PDFInfo
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- CN107205273B CN107205273B CN201610152626.3A CN201610152626A CN107205273B CN 107205273 B CN107205273 B CN 107205273B CN 201610152626 A CN201610152626 A CN 201610152626A CN 107205273 B CN107205273 B CN 107205273B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a processing method and a device of DCI blind detection data, wherein the method comprises the following steps: judging whether the energy sum of the current CCE is greater than the noise energy threshold of the PDCCH channel; under the condition that the energy sum is larger than the PDCCH channel noise energy threshold, solving the redundant symbol bit number of the energy sum, and determining the shift number of RE in the current CCE according to the redundant symbol bit number so as to shift RE according to the shift number; sending the soft information corresponding to the shifted CCE to a coprocessor for predetermined processing; and after all CCEs are subjected to preset processing, performing DCI blind detection on the CCEs according to different polymerization degrees. By applying the method, the problems that in the prior art, the code rate, the power, the CCE space and the like of the PDCCH (physical Downlink control channel) scheduled by the base station can flexibly change, and the change factors bring larger calculated amount and increase the complexity to DCI blind detection, so that the DCI blind detection needs higher energy consumption are solved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for processing DCI (Downlink Control Information) blind sounding data.
Background
Compared with the 2G/3G technology, LTE (Long Term Evolution) has the advantages of high data rate, large cell capacity, coverage radius of 100km, low system delay and the like. The scheduling change of the physical layer of the terminal also becomes more frequent along with the switching of application scenes, and higher requirements are put forward on the processing stability of the terminal.
The LTE system involves various configurations such as bandwidth, transmission mode, carrier aggregation, and combines with channel conditions such as base station distance and multipath to create a variety of scenarios. Corresponding to these differences, the code rate, power, CCE (Control Channel Element) space, and the like of a PDCCH (Physical Downlink Control Channel) scheduled by the base station all change flexibly, for example, the DCI power offsets of different users may have a selection range of at least 10db according to a scene; the CCE polymerization degree can be flexibly scheduled according to 1, 2, 4 and 8; different transmission modes, bandwidths, and CA (carrier aggregation) configurations may cause DCI bit length variation, which may affect the code rate. These are unknown to the terminal, and therefore, more challenges are brought to DCI blind detection, which requires better DCI blind detection performance.
Disclosure of Invention
The invention provides a processing method and a processing device of DCI blind detection data, which are used for solving the problems that the code rate, the power, the CCE space and the like of a PDCCH (physical Downlink control channel) scheduled by a base station in the prior art can flexibly change, and the change factors can bring larger calculation amount and increase the complexity to DCI blind detection, so that the DCI blind detection needs higher energy consumption.
In order to solve the above technical problem, in one aspect, the present invention provides a method for processing DCI blind sounding data, including: judging whether the energy sum of the current CCE is greater than the noise energy threshold of the PDCCH channel; under the condition that the energy sum is larger than the PDCCH channel noise energy threshold, calculating the redundant symbol bit number of the energy sum, determining the shift number of RE in the current CCE according to the redundant symbol bit number, and shifting the RE according to the shift number; sending the soft information corresponding to the shifted CCE to a coprocessor for predetermined processing; and after all CCEs complete the preset processing, performing DCI blind detection on the CCEs according to different polymerization degrees.
Further, determining the shift number of the RE in the current CCE according to the redundant symbol bit number includes: and determining the shift number of the RE in the current CCE according to the redundant symbol digit and a preset redundant symbol digit, wherein the preset redundant symbol digit is the redundant symbol digit of the constellation point amplitude corresponding to the optimal quantization mean value of the decoder.
Further, sending the soft information corresponding to the shifted CCE to a coprocessor for predetermined processing, wherein the step of sending the soft information corresponding to the shifted CCE to the coprocessor comprises the following steps: demodulating and descrambling the shifted CCE to obtain the soft information; and sending the soft information to the coprocessor for the preset processing.
Further, before judging whether the energy sum of the current CCE is greater than the PDCCH channel noise energy threshold, the method further comprises the following steps: calculating the energy sum of the current CCE.
Further, calculating the energy sum of the current CCE, further comprises: and carrying out signal equalization processing on communication data of the PDCCH to eliminate channel interference.
In another aspect, the present invention provides a device for processing DCI blind sounding data, including: the judging module is used for judging whether the energy sum of the current CCE is greater than the PDCCH channel noise energy threshold or not; a first processing module, configured to, when the energy sum is greater than the PDCCH channel noise energy threshold, find a redundant symbol bit number for the energy sum, and determine a shift number of an RE in the current CCE according to the redundant symbol bit number, so as to shift the RE according to the shift number; the second processing module is used for sending the soft information corresponding to the shifted CCE to the coprocessor for predetermined processing; and the blind detection module is used for carrying out DCI blind detection on the CCEs according to different polymerization degrees after all the CCEs complete the preset processing.
Further, the first processing module is specifically configured to: and determining the shift number of the RE in the current CCE according to the redundant symbol digit and a preset redundant symbol digit, wherein the preset redundant symbol digit is the redundant symbol digit of the constellation point amplitude corresponding to the optimal quantization mean value of the decoder.
Further, the second processing module comprises: a demodulation descrambling unit, configured to demodulate and descramble the shifted CCE to obtain the soft information; and the processing unit is used for sending the soft information to the coprocessor for the predetermined processing.
Further, still include: a calculating module, configured to calculate an energy sum of the current CCE.
Further, still include: and the third processing unit is used for performing signal equalization processing on the communication data of the PDCCH so as to eliminate channel interference.
The invention processes the CCE to be subjected to DCI blind detection, selects which CCE to process through the PDCCH channel noise energy threshold, and selects the mode of RE shift to balance the scaling factors of each CCE in the processing process.
Drawings
Fig. 1 is a flowchart of a processing method of DCI blind sounding data in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for processing DCI blind sounding data according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second processing module of the apparatus for processing DCI blind sounding data according to the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a preferred apparatus for processing DCI blind sounding data in an embodiment of the present invention;
FIG. 5 is a flowchart of a processing method of DCI blind sounding data in a preferred embodiment of the present invention;
FIG. 6 is a diagram illustrating soft information amplitude obtained by a conventional uniform scaling method according to a preferred embodiment of the present invention;
fig. 7 is a schematic diagram of soft information amplitude obtained by using a DCI blind sounding data processing method in a preferred embodiment of the present invention.
Detailed Description
In order to solve the problem that the code rate, power, CCE space and the like of a PDCCH channel scheduled by a base station in the prior art all change flexibly, and the change factors bring a large amount of calculation to DCI blind detection and increase complexity, which results in that DCI blind detection requires high energy consumption, the invention provides a DCI blind detection data processing method and device, and the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The embodiment of the invention provides a method for processing DCI blind detection data, the flow of the method is shown in FIG. 1, and the method comprises steps S102 to S108:
s102, judging whether the energy sum of the current CCE is larger than a PDCCH channel noise energy threshold or not;
s104, under the condition that the energy sum is larger than the PDCCH channel noise energy threshold, solving the redundant symbol bit number of the energy sum, determining the shift number of RE in the current CCE according to the redundant symbol bit number, and shifting the RE according to the shift number;
s106, sending the soft information corresponding to the shifted CCE to a coprocessor for predetermined processing;
and S108, after all CCEs are subjected to preset processing, performing DCI blind detection on the CCEs according to different polymerization degrees.
The embodiment of the invention processes the CCEs to be subjected to DCI blind detection, selects which CCEs are processed through the PDCCH channel noise energy threshold, and selects the mode of RE shift to balance the scaling factors of the CCEs in the processing process.
In the implementation process, when the shift number of the RE in the current CCE is determined according to the redundant symbol bit number, the shift number of the RE in the current CCE may be determined according to the redundant symbol bit number and a preset redundant symbol bit number, where the preset redundant symbol bit number is the redundant symbol bit number of the constellation point amplitude corresponding to the optimal quantization mean of the decoder.
In the process of sending the soft information corresponding to the shifted CCE to the coprocessor for predetermined processing, the shifted CCE can be demodulated and descrambled to obtain the soft information; and then the soft information is sent to a coprocessor for predetermined processing.
Before judging whether the energy sum of the current CCE is larger than the noise energy threshold of the PDCCH channel, signal equalization processing can be further carried out on communication data of the PDCCH to eliminate channel interference, and after the channel interference is eliminated, the energy sum of the current CCE is calculated.
An embodiment of the present invention further provides a device for processing DCI blind probe data, where a flow of the device is shown in fig. 2, and the device includes: a judging module 10, configured to judge whether the sum of the energy of the current CCE is greater than a PDCCH channel noise energy threshold; a first processing module 20, coupled to the determining module 10, configured to solve the energy sum for a redundant symbol bit number under the condition that the energy sum is greater than a PDCCH channel noise energy threshold, and determine a shift number of an RE in a current CCE according to the redundant symbol bit number, so as to shift the RE according to the shift number; the second processing module 30 is coupled to the first processing module 20, and configured to send the soft information corresponding to the shifted CCE to the coprocessor for predetermined processing; and a blind detection module 40, coupled to the second processing module 30, configured to perform DCI blind detection on all CCEs according to different aggregation levels after all CCEs complete predetermined processing.
The first processing module 20 is specifically configured to: and determining the shift number of the RE in the current CCE according to the redundant symbol number and a preset redundant symbol number, wherein the preset redundant symbol number is the redundant symbol number of the constellation point amplitude corresponding to the optimal quantization mean value of the decoder.
Fig. 3 shows a schematic structural diagram of the second processing module 30, which includes: a demodulation descrambling unit 301, configured to demodulate and descramble the shifted CCE to obtain soft information; and a processing unit 302 coupled to the demodulation and descrambling unit 301, for sending the soft information to the coprocessor for predetermined processing.
In a preferred embodiment, the processing device may further include, as shown in fig. 4: a third processing unit 50, configured to perform signal equalization processing on communication data of the PDCCH to eliminate channel interference; a calculating module 60, coupled to the third processing unit 50 and the judging module 10, for calculating the energy sum of the current CCE.
PREFERRED EMBODIMENTS
The base station simultaneously schedules the control information of the common space and the exclusive space of each UE on the PDCCH. Therefore, control information with different amplitudes, different signal-to-noise ratios and different CCE polymerization degrees can exist on the control symbols according to random UE access, the UE cannot distinguish the CCE space belonging to the UE only from signal characteristics, and DCI blind detection performance can fluctuate along with changes during unified quantization processing.
The embodiment of the invention provides a processing method of DCI blind detection data, aiming at controlling the soft information amplitude with lower realization cost and enabling the performance of a decoder to be optimal, thereby improving the PDCCH (physical downlink control channel) resolution performance of a UE (user equipment) side.
The embodiment of the invention takes the quantization mean value corresponding to the optimal performance of the decoder realized by the PDCCH data as the target, takes the CCE as the granularity, and carries out the segmented scaling and calibration on the modulation symbols, thereby quantizing the amplitude mean value of each DCI soft information to the optimal range with very small realization cost and improving the blind detection stability.
In the embodiment of the present invention, a suitable fixed point rule needs to be found to optimize the performance of the decoder, and the embodiment can adapt to the situation that the power of each DCI is inconsistent, so the following situations need to be considered when designing the embodiment:
(1) the changes of the transmitting power, the CCE polymerization degree, the CCE initial position, the code rate and the like of different DCIs can form different combinations, the power adjustment strategy needs to ensure that the soft information of different DCIs is respectively optimally quantized, and the scaling factors on each CCE corresponding to the same DCI are required to be consistent; (2) the optimal scaling method needs to make the soft information amplitude mean value close to the amplitude mean value corresponding to the optimal performance of the decoder, and needs to abandon the scaling strategy taking the maximum value as the standard to be ensured not to overflow; (3) the amplitude adjustment of the signal avoids the situation of noise rise as much as possible.
Based on the above objectives, the flow of the processing method for DCI blind probe data provided in the embodiment of the present invention is shown in fig. 5, where the number of CCEs is preset to be N, the PDCCH channel noise energy threshold is a, the number of redundant sign bits corresponding to the constellation point amplitude of the optimal quantization mean of the decoder is B, initialization i is 0, and the following processing flows S501 to S508 are performed on the PDCCH:
s501, signal equalization processing is carried out on the PDCCH so as to eliminate channel interference.
S502, in the equalized data, energy sum is obtained for the ith CCE. In implementation, starting from the 0 th CCE, the energy sum of each CCE is calculated.
S503, judging whether the energy sum of the current CCE is larger than A. If so, executing S504, otherwise returning to S502, and continuing to energy-sum the next CCE.
And S504, calculating the redundant sign digit number C according to the energy sum, and calculating the RE shift number in a rounding mode, wherein the shift number is (C-B + 1)/2.
S505, shifts REs in the CCE according to the shift number.
S506, determine whether the polling of the CCE is completed, that is, the sum of the energies of all CCEs is calculated. If so, executing S507, otherwise returning to S502, and continuing to calculate the next CCE energy sum.
And S507, demodulating and descrambling the shifted CCE to obtain soft information.
And S508, sending the soft information to a coprocessor, and carrying out blind probing according to various CCE polymerization degrees until CRC (cyclic redundancy Check) analysis is correct.
The embodiment adapts the flexible combination of each DCI of the PDCCH with extremely low realization cost, and the method selects the amplitude scaling node more reasonably before the demodulation process in the original PDCCH processing flow; after equalization, the channel characteristics are eliminated, and the constellation point amplitude is stable; symbol-level scaling consumes less resources than soft information scaling; only the CCE containing DCI may be processed; blind detection of the probe at different CCE aggregation levels does not need to consider whether the CCE scaling factors are the same.
Therefore, the improvement proposed by the embodiment of the present invention is a combination of the following two: abandoning the mode of uniformly calibrating the whole PDCCH channel, and providing a strategy of sectionally calibrating by taking CCE as granularity; the general scaling mode that the maximum value of the signal does not overflow is abandoned, and the dynamic quantization is carried out by taking the amplitude average value which achieves the optimal performance of the decoder as a target.
In the following, with reference to the accompanying drawings, advantages of the above processing method are described by taking a scenario as an example, and this embodiment assumes that only 1 UE accesses, and describes that there are two comparison cases.
The first condition is as follows: the base station schedules DCI1A in the common space, and the scheduling case is as follows: the bit stream length is 27 bits, the CCE allocation degree of aggregation is 8 in the shared space, and the transmission power offset is configured to +3 db.
Case two: and scheduling the DCI2A for the accessed UE, wherein the scheduling condition is as follows: the bit stream length is 41 bits, the CCE aggregation degree is 1 in the shared space, and the transmission power offset is configured to be-3 db.
As can be seen from the above comparison, the DCI2A has a high code rate and low power, and therefore, if the conventional unified scaling method is used, the soft information amplitude of the CCE is as shown in fig. 6, and blind detection can normally detect DCI1A, but the probability of missing DCI2A is relatively high. However, after applying the processing method of this embodiment, the soft information amplitude is as shown in fig. 7, and the missing rate of DCI2A is significantly reduced.
In this embodiment, only the polymerization degrees 8 and 1 are taken as examples, and the same improvement is also provided for the combined configuration of other DCIs.
The method provided by the embodiment eliminates the instability caused by scaling the whole channel to the full amplitude at the maximum value with small implementation cost. Practice tests prove that under the conditions that the signal intensity variation range is large, and the DCI power and the CCE polymerization degree are flexibly configured, the blind detection performance can be obviously improved; most of the current decoding implementation schemes are implemented by hardware coprocessors, so that according to the embodiment, segmentation calibration is performed based on specific transmission power configuration granularity, and the design of other communication receiving ends has the same reference significance; in addition, the embodiment may also be used to improve the decoding performance of the PDSCH channel, thereby improving the traffic of the UE.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (8)
1. A method for processing Downlink Control Information (DCI) blind sounding data is characterized by comprising the following steps:
judging whether the energy sum of the CCE of the current control channel unit is greater than the noise energy threshold of the PDCCH channel of the physical downlink control channel;
under the condition that the energy sum is larger than the PDCCH channel noise energy threshold, calculating the redundant symbol bit number of the energy sum, determining the shift number of RE in the current CCE according to the redundant symbol bit number, and shifting the RE according to the shift number; the determining the shift number of the RE in the current CCE according to the redundant symbol bit number comprises: determining the shift number of RE in the current CCE according to the redundant symbol digit and a preset redundant symbol digit, wherein the preset redundant symbol digit is the redundant symbol digit of the constellation point amplitude corresponding to the optimal quantization mean value of the decoder;
sending the soft information corresponding to the shifted CCE to a coprocessor for predetermined processing;
and after all CCEs complete the preset processing, performing DCI blind detection on the CCEs according to different polymerization degrees.
2. The processing method of claim 1, wherein sending the soft information corresponding to the shifted CCE to a coprocessor for predetermined processing comprises:
demodulating and descrambling the shifted CCE to obtain the soft information;
and sending the soft information to the coprocessor for the preset processing.
3. The processing method of any one of claims 1 to 2, wherein before determining whether the energy sum of the current CCE is greater than the PDCCH channel noise energy threshold, further comprising:
calculating the energy sum of the current CCE.
4. The processing method of claim 3, wherein calculating the energy sum of the current CCE further comprises:
and carrying out signal equalization processing on communication data of the PDCCH to eliminate channel interference.
5. A processing device for downlink control information DCI blind sounding data is characterized by comprising:
the judging module is used for judging whether the sum of the energy of the CCE (control channel element) of the current control channel is greater than the threshold of the noise energy of the PDCCH (physical downlink control channel) channel;
a first processing module, configured to, when the energy sum is greater than the PDCCH channel noise energy threshold, find a redundant symbol bit number for the energy sum, and determine a shift number of an RE in the current CCE according to the redundant symbol bit number, so as to shift the RE according to the shift number; the first processing module is specifically configured to: determining the shift number of RE in the current CCE according to the redundant symbol digit and a preset redundant symbol digit, wherein the preset redundant symbol digit is the redundant symbol digit of the constellation point amplitude corresponding to the optimal quantization mean value of the decoder;
the second processing module is used for sending the soft information corresponding to the shifted CCE to the coprocessor for predetermined processing;
and the blind detection module is used for carrying out DCI blind detection on the CCEs according to different polymerization degrees after all the CCEs complete the preset processing.
6. The processing apparatus of claim 5, wherein the second processing module comprises:
a demodulation descrambling unit, configured to demodulate and descramble the shifted CCE to obtain the soft information;
and the processing unit is used for sending the soft information to the coprocessor for the predetermined processing.
7. The processing apparatus according to any one of claims 5 to 6, further comprising:
a calculating module, configured to calculate an energy sum of the current CCE.
8. The processing apparatus as in claim 7, further comprising:
and the third processing unit is used for performing signal equalization processing on the communication data of the PDCCH so as to eliminate channel interference.
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| CN201610152626.3A CN107205273B (en) | 2016-03-17 | 2016-03-17 | DCI blind detection data processing method and device |
| PCT/CN2017/071558 WO2017157103A1 (en) | 2016-03-17 | 2017-01-18 | Method of processing data in dci blind detection, and device |
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| CN116113019A (en) * | 2021-11-11 | 2023-05-12 | 中兴通讯股份有限公司 | Control method of terminal equipment, terminal equipment and storage medium |
| CN117896040B (en) * | 2024-03-14 | 2024-06-25 | 南京创芯慧联技术有限公司 | Method, device, computer equipment and storage medium for detecting downlink control information |
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| CN102195923A (en) * | 2010-03-16 | 2011-09-21 | Lg电子株式会社 | Method and base station for transmitting reference signals, and method and user equipment for receiving reference signals |
| CN102771069A (en) * | 2010-02-23 | 2012-11-07 | Lg电子株式会社 | Method and user equipment for measuring interference, and method and base station for receiving interference information |
| WO2013067839A1 (en) * | 2011-11-10 | 2013-05-16 | 电信科学技术研究院 | Pdcch resource allocation method and device |
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| US8467476B2 (en) * | 2007-09-17 | 2013-06-18 | Mediatek Inc. | Scaling apparatus of a receiver |
| WO2012075609A1 (en) * | 2010-12-09 | 2012-06-14 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement in a wireless communication system |
| CN102325001B (en) * | 2011-05-24 | 2013-07-31 | 东南大学 | Bandwidth-adaptive big iteration receiver |
| EP2810507B1 (en) * | 2012-01-30 | 2020-01-15 | Telefonaktiebolaget LM Ericsson (publ) | Methods and network nodes for scheduling transmission |
| CN102769600B (en) * | 2012-08-13 | 2016-01-13 | 武汉邮电科学研究院 | The method of zoom factor rectification and device in a kind of ofdm system receiver |
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| CN102771069A (en) * | 2010-02-23 | 2012-11-07 | Lg电子株式会社 | Method and user equipment for measuring interference, and method and base station for receiving interference information |
| CN102195923A (en) * | 2010-03-16 | 2011-09-21 | Lg电子株式会社 | Method and base station for transmitting reference signals, and method and user equipment for receiving reference signals |
| WO2013067839A1 (en) * | 2011-11-10 | 2013-05-16 | 电信科学技术研究院 | Pdcch resource allocation method and device |
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