CN101841825A - Channel detecting method and equipment in long-term evolution system - Google Patents
Channel detecting method and equipment in long-term evolution system Download PDFInfo
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- CN101841825A CN101841825A CN200910080384A CN200910080384A CN101841825A CN 101841825 A CN101841825 A CN 101841825A CN 200910080384 A CN200910080384 A CN 200910080384A CN 200910080384 A CN200910080384 A CN 200910080384A CN 101841825 A CN101841825 A CN 101841825A
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Abstract
The embodiment of the invention discloses a channel detection method in a long-term evolution system, comprising the following steps of: selecting one control format indication (CFI) value different from a CFI value used for the detection failure of a physical downlink control channel (PDCCH) from one or more preset CFI values after the failure of detecting the PDCCH; and re-detecting the PDCCH by using the selected CFI value. The embodiment of the invention also discloses channel detection equipment. By adopting the invention, the probability for successfully detecting the PDCCH can be improved, and further the throughout of the system can be improved.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to channel detection method and equipment in a kind of long evolving system.
Background technology
In Long Term Evolution (LTE) system, physics control model indicating channel (PCFICH) carrying expression Physical Downlink Control Channel (physical downlink control channel, PDCCH) shared OFDM (Orthogonal Frequency Division Multiplexing, OFDM) the detection sequence of symbolic number information; PDCCH carries this PDCCH corresponding physical downlink sharied signal channel (Physical Downlink Shared Channel, PDSCH) descending control indication (DCI) information, this DCI information comprise sending mode, whether frequency modulation, take the indication information of physical resource etc.
At present, the testing process of PDSCH is specific as follows:
At first, detect PCFICH, obtain the detection sequence that expression PDCCH that this PCFICH carries takies OFDM symbolic number information;
Then, calculate control format indication (CFI) value corresponding to detection sequence that obtains, and determine the physical resource position at PDCCH place according to this CFI value;
Then, detect PDCCH in the physical resource position of determining, obtain the DCI information of PDSCH corresponding to this PDCCH, this DCI information is carried out CRC check, if the check results indicating correct receives, then detect PDSCH according to this DCI information; If the check results misdirection receives, then do not detect PDSCH, but send wrong responses (NACK) message, the DCI information of request repeat PDSCH to system side.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
In the prior art, in CFI value corresponding to detection sequence of utilizing the PCFICH carrying, detect PDCCH in a single day to the as a result misdirection reception of CRC check of PDCCH, then UE sends NACK, need system side to retransmit PDCCH and the PDSCH corresponding with it, reduced the handling capacity of system.
Summary of the invention
The embodiment of the invention provides channel detection method and the equipment in a kind of long evolving system, is used to improve throughput of system.
The embodiment of the invention provides the channel detection method in a kind of long evolving system, and this method comprises:
After detecting the physical downlink control channel PDCCH failure, from the one or more control formats indication CFI values that set in advance, choose a different CFI value of CFI value of utilizing when failing with detection PDCCH;
The CFI value that utilization is chosen detects again to described PDCCH.
A kind of channel detection equipment of the embodiment of the invention, this equipment comprises:
Indicated value is chosen the unit, is used for after detecting the physical downlink control channel PDCCH failure, chooses a different CFI value of CFI value of utilizing when failing with detection PDCCH from the one or more control formats indication CFI values that set in advance;
The first Channel Detection unit is used to utilize the described CFI value of choosing unit selection that described PDCCH is detected again.
In the scheme that the embodiment of the invention provides, after detecting the physical downlink control channel PDCCH failure, from the one or more control formats indication CFI values that set in advance, choose a different CFI value of CFI value of utilizing when failing with detection PDCCH, and utilize the CFI value of choosing that described PDCCH is detected again, again detect and to improve the probability that detects the PDCCH success, and then reduce the PDSCH retransmission probability, throughput of system is provided.
Description of drawings
The method flow schematic diagram that Fig. 1 provides for the embodiment of the invention;
Fig. 2 is the schematic flow sheet of method embodiment among the present invention;
The device structure schematic diagram that Fig. 3 provides for embodiment among the present invention.
Embodiment
In order to improve throughput of system, the embodiment of the invention provides the channel detection method in a kind of long evolving system, in this method, after detecting the PDCCH failure, utilizes the CFI value that arranges that this PDCCH is detected again.
Referring to Fig. 1, the channel detection method in the long evolving system that the embodiment of the invention provides specifically may further comprise the steps:
Step 10: when detecting the PDCCH failure, from the one or more CFI values that set in advance, choose a CFI value that was not selected.Here, detect the PDCCH failure and refer to, the as a result misdirection that the DCI information of detection PDCCH acquisition is carried out CRC check receives, and detects PDCCH and successfully refers to, the DCI information that detects the PDCCH acquisition is carried out the as a result indicating correct reception of CRC check., from one or more CFI values, choose a CFI value that was not selected herein, refer to choose a CFI value that the CFI value of utilizing when detecting the PDCCH failure is different.
Step 11: utilize the CFI value of choosing that PDCCH is detected again.
In the step 10, before from the one or more CFI values that set in advance, choosing a CFI value that was not selected, according to the priority of each CFI value in the definite one or more CFI values that arrange of the detection sequence of PCFICH carrying.The priority determining step specifically can be before step 10, also can detect after the PDCCH failure in step 10 and chooses before the CFI value that was not selected from the one or more CFI values that set in advance.Priority determines that method is specially: coded sequence corresponding to each CFI value in one or more CFI values of the detection sequence of PCFICH carrying and setting carried out respectively the despreading computing, obtain a plurality of despreading operation result values; The priority of each CFI value in one or more CFI values of determining to arrange according to the despreading operation result, the priority of the CFI value that more big despreading operation result value is corresponding is more high, and CFI value corresponding to despreading operation result value refers to obtain CFI value corresponding to coded sequence used in the despreading computing of this despreading operation result value.
After the priority of determining each CFI value, the concrete grammar of choosing the CFI value in the step 10 is:
Step S01: the CFI value that was not selected in one or more CFI values of determining to arrange.
Here, if do not have the CFI value that was not selected in the one or more CFI values that arrange, then send answer failed NACK response message, this Channel Detection flow process finishes.
Step S02: the priority according to each CFI value is determined the result, chooses the highest CFI value of priority in the CFI value that never was selected.
Here, except can choosing the highest CFI value of the CFI value medium priority that was not selected, can certainly choose in proper order according to other, such as choosing time high CFI value of the highest CFI value of priority, priority etc.
In the step 10, the concrete grammar of choosing the CFI value can also be to choose at random a CFI value that also was not selected from the one or more CFI values that arrange, and do not need to choose according to the priority of each CFI value.
In the step 12, after PDCCH detected again,, then can return step 10 if detect failure.Therefore, in the step 10, the CFI value of utilizing when detecting PDCCH is the CFI value corresponding to detection sequence of PCFICH carrying, the CFI value in the one or more CFI values that perhaps set in advance.General, what utilize when detecting PDCCH first is the CFI value corresponding to detection sequence of PCFICH carrying, and follow-up PDCCH detects utilization is CFI value in the one or more CFI values that set in advance.
Definite method of the CFI value that the detection sequence of PCFICH carrying is corresponding is: coded sequence corresponding to each CFI value in one or more CFI values of the detection sequence of PCFICH carrying and setting carried out respectively the despreading computing, CFI value corresponding to detection sequence that the CFI value that the despreading operation result value of maximum is corresponding is carried as PCFICH.
After the step 12, to the re-detection of PDCCH success the time, detect PDSCH according to the DCI information of this PDCCH carrying.
With specific embodiment the method that the embodiment of the invention provides is described below:
As shown in Figure 2, the idiographic flow of present embodiment is as follows:
Step S11: detect PCFICH, the priority of each CFI value in a plurality of CFI values of determining to arrange according to the detection sequence that obtains;
Step S12: according to priority order from high to low each CFI value is sorted, generate the CFI value set CFI_sort after sorting;
Step S13: initialization i=1;
Step S14: will gather among the CFI_sort i value and compose and give CFI variable: CFI=CFI_sort (i); The priority of the CFI value of the more little correspondence of i value is high more;
Step S15:, determine the concrete physical resource position at PDCCH place according to the value of current C FI variable; Then, on this position, detect PDCCH;
Step S16: judge and to carry out the result of CRC check whether indicating correct receives, if then arrive step S20 to detecting DCI information that PDCCH obtains; Otherwise, to step S17;
Step S17: judge that i+1 whether greater than the number of gathering element among the CFI_sort, if be not more than, then arrives step S18; Otherwise, to step S19;
Step S18: the value of i is added 1, i.e. i=i+1, and return step S14;
Step S19: send the NACK response message, and the detection of end flow process;
Step S20: according to the DCI information of PDCCH carrying, detect PDSCH, and the detection of end flow process.
Referring to Fig. 3, the embodiment of the invention also provides a kind of channel detection equipment, and this equipment comprises:
Indicated value is chosen unit 30, is used for after detecting the physical downlink control channel PDCCH failure, chooses a CFI value that was not selected from the one or more control format indication CFI values that set in advance;
The first Channel Detection unit 31 is used to utilize the described CFI value of choosing unit selection that described PDCCH is detected again.
This equipment further comprises:
Described indicated value is chosen unit 30 and is comprised:
The screening unit is used for the CFI value of determining that described one or more CFI values were not selected;
Choose the unit, be used for determining the result, from the described CFI value that was not selected, choose the highest CFI value of priority according to the priority of described priority determining unit.
Described priority determining unit 32 comprises:
Arithmetic element is used for the detection sequence coded sequence corresponding with described one or more each CFI value of CFI value of PCFICH carrying carried out respectively the despreading computing;
Sequencing unit is used for the despreading operation result according to described arithmetic element, determines the priority of each CFI value in described one or more CFI value, and the priority of the CFI value that more big despreading operation result value is corresponding is more high.
This equipment further comprises:
Detect response transmitting element 33, be used for when described indicated value is chosen unit selection CFI value, if do not have the CFI value that was not selected in described one or more CFI value, then sending answer failed NACK response message.
This equipment further comprises:
Second channel detecting unit 34 is used for the CFI value chosen in the described first Channel Detection unit by using described PDCCH is detected when successful again, detects physical down link sharing channel PDSCH according to the DCI information of this PDCCH carrying.
To sum up, beneficial effect of the present invention is:
In the scheme that the embodiment of the invention provides, after detecting the physical downlink control channel PDCCH failure, from the one or more control format indication CFI values that set in advance, choose a CFI value that was not selected, and utilize the CFI value of choosing that described PDCCH is detected again, again detect and to improve the probability that detects the PDCCH success, and then reduce the PDSCH retransmission probability, throughput of system is provided.
The present invention to increase littler complexity as cost, improves the probability that detects the PDCCH success by cycle detection PDCCH, reduces the PDSCH retransmission probability, improves the handling capacity of system, and can be in real system real-time implementation.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the channel detection method in the long evolving system is characterized in that this method comprises:
After detecting the physical downlink control channel PDCCH failure, from the one or more control formats indication CFI values that set in advance, choose a different CFI value of CFI value of utilizing when failing with detection PDCCH;
The CFI value that utilization is chosen detects again to described PDCCH.
2. the method for claim 1 is characterized in that, choose the different CFI value of CFI value of utilizing when failing with detection PDCCH from the one or more control formats indication CFI values that set in advance before, this method further comprises:
Determine the priority of each CFI value in described one or more CFI value according to the detection sequence of physical control pattern indicating channel PCFICH carrying;
Describedly from the one or more control formats indication CFI values that set in advance, choose a different CFI value of CFI value of utilizing when failing with detection PDCCH and comprise:
Determine in described one or more CFI value the different CFI value of CFI value utilized when detecting the PDCCH failure;
Priority according to each CFI value is determined the result, chooses the highest CFI value of priority from the different CFI value of the described CFI value of being utilized when detecting the PDCCH failure.
3. method as claimed in claim 2 is characterized in that, described detection sequence according to the PCFICH carrying determines that the priority of each CFI value in described one or more CFI value comprises:
The detection sequence coded sequence corresponding with each CFI value in described one or more CFI values of PCFICH carrying carried out respectively the despreading computing;
Determine the priority of each CFI value in described one or more CFI value according to the despreading operation result, the priority of the CFI value that more big despreading operation result value is corresponding is more high.
4. method as claimed in claim 2 is characterized in that, if the different CFI value of CFI value of utilizing when not existing from detection PDCCH failure in described one or more CFI value then sends answer failed NACK response message, the Channel Detection flow process finishes.
5. the method for claim 1 is characterized in that, described detection PDCCH failure comprises:
Utilize the CFI value of the detection sequence correspondence of PCFICH carrying, detect the PDCCH failure; Perhaps,
Utilize the CFI value in the described one or more CFI values that set in advance, detect the PDCCH failure.
6. the method for claim 1 is characterized in that, after the CFI value that utilization is chosen detected again to described PDCCH, this method further comprised:
When detecting the PDCCH success, according to the descending control indication information detection physical down link sharing channel PDSCH of this PDCCH carrying.
7. a channel detection equipment is characterized in that, this equipment comprises:
Indicated value is chosen the unit, is used for after detecting the physical downlink control channel PDCCH failure, chooses a different CFI value of CFI value of utilizing when failing with detection PDCCH from the one or more control formats indication CFI values that set in advance;
The first Channel Detection unit is used to utilize the described CFI value of choosing unit selection that described PDCCH is detected again.
8. equipment as claimed in claim 7 is characterized in that, this equipment further comprises:
Priority determining unit is for the priority of determining described one or more each CFI value of CFI value according to the detection sequence of physical control pattern indicating channel PCFICH carrying;
Described indicated value is chosen the unit and is comprised:
The screening unit is used for the different CFI value of being utilized when determining described one or more CFI values and detecting the PDCCH failure of CFI value;
Choose the unit, be used for determining the result according to the priority of described priority determining unit, from the CFI value that described screening unit is determined, choose the highest CFI value of priority.
9. equipment as claimed in claim 8 is characterized in that, described priority determining unit comprises:
Arithmetic element is used for the detection sequence coded sequence corresponding with described one or more each CFI value of CFI value of PCFICH carrying carried out respectively the despreading computing;
Sequencing unit is used for the despreading operation result according to described arithmetic element, determines the priority of each CFI value in described one or more CFI value, and the priority of the CFI value that more big despreading operation result value is corresponding is more high.
10. equipment as claimed in claim 7 is characterized in that, this equipment further comprises:
Detect the response transmitting element, be used for when described indicated value is chosen unit selection CFI value, if the different CFI value of CFI value of utilizing when not existing from detection PDCCH failure in described one or more CFI value then sends answer failed NACK response message.
11. equipment as claimed in claim 7 is characterized in that, this equipment further comprises:
The second channel detecting unit is used for the CFI value chosen in the described first Channel Detection unit by using described PDCCH is detected when successful again, detects physical down link sharing channel PDSCH according to the descending control indication information of this PDCCH carrying.
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| CN 200910080384 CN101841825B (en) | 2009-03-20 | 2009-03-20 | Channel detecting method and equipment in long-term evolution system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155590A1 (en) * | 2011-07-07 | 2012-11-22 | 中兴通讯股份有限公司 | Method and apparatus for adaptively adjusting pdcch |
| WO2019137180A1 (en) * | 2018-01-12 | 2019-07-18 | Jrd Communication (Shenzhen) Ltd | Control information transmission |
| CN110856120A (en) * | 2018-08-20 | 2020-02-28 | 北京中兴高达通信技术有限公司 | Message sending and receiving method and device |
| CN111083791A (en) * | 2018-10-22 | 2020-04-28 | 华为技术有限公司 | Data transmission method and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100583717C (en) * | 2001-11-30 | 2010-01-20 | 三星电子株式会社 | Apparatus and method for transmitting and receiving data on packet data control channel |
| US7792134B2 (en) * | 2004-04-30 | 2010-09-07 | Alcatel-Lucent Usa Inc. | Method and apparatus for detecting an uplink packet data channel in a CDMA wireless communications system |
| CN101378306B (en) * | 2007-08-31 | 2012-07-04 | 华为技术有限公司 | Control channel distribution as well as method and apparatus for indicating ACK/NACK channel distribution |
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2009
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155590A1 (en) * | 2011-07-07 | 2012-11-22 | 中兴通讯股份有限公司 | Method and apparatus for adaptively adjusting pdcch |
| WO2019137180A1 (en) * | 2018-01-12 | 2019-07-18 | Jrd Communication (Shenzhen) Ltd | Control information transmission |
| CN110856120A (en) * | 2018-08-20 | 2020-02-28 | 北京中兴高达通信技术有限公司 | Message sending and receiving method and device |
| CN110856120B (en) * | 2018-08-20 | 2022-03-11 | 北京中兴高达通信技术有限公司 | Message sending and receiving method and device |
| CN111083791A (en) * | 2018-10-22 | 2020-04-28 | 华为技术有限公司 | Data transmission method and device |
| CN111083791B (en) * | 2018-10-22 | 2021-10-01 | 华为技术有限公司 | Data transmission method and device |
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