CN102215507A - Method and system for detecting downlink control channel - Google Patents
Method and system for detecting downlink control channel Download PDFInfo
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- CN102215507A CN102215507A CN201010156581XA CN201010156581A CN102215507A CN 102215507 A CN102215507 A CN 102215507A CN 201010156581X A CN201010156581X A CN 201010156581XA CN 201010156581 A CN201010156581 A CN 201010156581A CN 102215507 A CN102215507 A CN 102215507A
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Abstract
The invention discloses a method and system for detecting a downlink control channel. The method for detecting the downlink control channel comprises the following steps: a base station sends a signaling to a relay node, wherein the signaling carries information for bearing the number of semi-static configured physical resource blocks of the downlink control channel or carries information for bearing the number of the physical resource blocks actually occupied by the downlink control channel; the relay node acquires physical resource blocks to be determined according to the information; and the relay node carries out blind detection on the physical resource blocks distributed by the base station according to the physical resource blocks to be detected. According to the method and the system for detecting the downlink control channel, the problems of more times of blind detection and longer delay time of the blind detection of an R-PDCCH (Relay Physical Downlink Control Channel) in the prior art are solved, the configuration flexibility of a PRB (Physical Resource Block) bearing the R-PDCCH is ensured, and the efficiency of the whole system is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of detection method and system of down control channel.
Background technology
After in wireless communication system, introducing via node, reduce the method for via node to the blind Detecting complexity of the down control channel from (eNB) (R-PDCCH, Relay Physical DownlinkControl Channel).
Because following radio communication or cellular system require to increase coverage, support the higher rate transmission, this has proposed new challenge to wireless communication technology.Simultaneously, the cost issues of system building and maintenance is more outstanding.Along with the increase of transmission rate and communication distance, it is outstanding that the energy consumption issues of battery also becomes, and following radio communication will adopt higher frequency, and the pathloss attenuation that causes thus is more serious.In order to increase the coverage of high data rate, group mobility, casual network deployment, improve the throughput of cell edge, and provide service for the user in the covering leak of cellular system, introduced relaying (Relay) technology in the wireless communication system, so relaying technique is regarded as the key technology of 4G.
In Long Term Evolution (LTE, Long term Evolution) communication system, the design of down control channel (PDCCH, Physical Downlink Control Channel) is made of several different parts, and each part all has its specific function.For convenience of description, define several terms and agreement below:
1. Resource Unit (RE, Resource Element): minimum time occupies 1 subcarrier on 1 OFDM symbol.
2. resource unit group (REG, Resource Element Group): according to the difference of reference symbol position on each OFDM symbol, 1 REG can be made up of 4 or 6 RE.
3. control information unit (CCE, Control Channel Element): by 36 RE, 9 REG form, the information that comprises among the CCE has: user's descending scheduling authorization message (DL grant) and uplink scheduling authorization information (UL grant), and and system message (SI, System Information), insert (RA at random, Random Access) response, the relevant information of paging (Paging).
4.Aggregation the combining form of level L:CCE, be that PDCCH can only be made of L CCE, wherein L ∈ { 1,2,4,8}, that is to say, PDCCH can only be by the combination (representing with 1-CCE) of 1 CCE, the combination of 2 CCE (representing) with 2-CCE, the combination (representing with 8-CCE) of the combination of 4 CCE (representing with 4-CCE) and 8 CCE constitutes, and 4 kinds of different code rates that above-mentioned 4 kinds of different combinations are corresponding respectively again, promptly the code rate of 1-CCE is 2/3, the code rate of 2-CCE is 1/3, the code rate of 4-CCE is 1/6, and the code rate of 8-CCE is 1/12.
5. search volume (SS, Search Space): the search volume is made of some groups of candidate control channels, and UE monitors the search volume, and carries out blind Detecting in the search volume, so that detect and own relevant down control channel.
6. two type of search spaces: a kind of is common search space (UE-commonSearch Space), i.e. the search volume that all will monitor of all UE, wherein, carrying be and SI RA response and the relevant public information of Paging; Another kind is the search volume (UE-specific Search Space) of UE special use, and wherein carrying is UE up-downgoing scheduling authorization information separately.
7. different CCE aggregation level has the number of its corresponding candidate's control channel, is the maximum times of blind Detecting.For example, under the UE-specific Search Space: the candidate control channel of 1-CCE is 6, and promptly the number of times that carries out blind Detecting by one group of 1 CCE is no more than 6 times; The candidate control channel of 2-CCE is 6, and promptly the number of times that carries out blind Detecting by one group of 2 CCE is no more than 6 times; The candidate control channel of 4-CCE is 2, and promptly the number of times that carries out blind Detecting by one group of 4 CCE is no more than 2 times; The candidate control channel of 8-CCE is 2, and promptly the number of times that carries out blind Detecting by one group of 8 CCE is no more than 2 times.Under the UE-common Search Space, the candidate control channel of 4-CCE is 4, and promptly the number of times that carries out blind Detecting by one group of 4 CCE is no more than 4 times; The candidate control channel of 8-CCE is 2, and promptly the number of times that carries out blind Detecting by one group of 8 CCE is no more than 2 times.
UE carries out the detailed process of blind Detecting in the LTE system to PDCCH:
1) at the eNB end, process of transmitting mainly may further comprise the steps:
Step 1: the PDCCH to each UE carries out chnnel coding respectively;
Step 2: the PDCCH of all UE after will encoding is together in series, and carries out scrambling with the sequence of cell-specific;
Step 3: carry out the QPSK modulation, that obtain this moment is the pairing a string CCE of all PDCCH, and they are numbered since 0; Suppose this moment down control channel constitute by 32 CCE altogether, promptly they be numbered CCE 0, CCE 1 ..., CCE 31;
Step 4: with above-mentioned a string CCE is to be mapped on the running time-frequency resource at PDCCH place after the unit interweaves with REG, wherein, occupy the whole system bandwidth on the frequency domain, specifically having taken several symbols on the time domain is indicated in detail by Physical Control Format Indicator Channel (PCFICH, Physical Control Format Indicate Channel);
Step 5: carry out going out after the IFFT conversion emission.
2) at the UE end, receiving course mainly may further comprise the steps:
Step 1: receiving terminal receives the PDCCH on the whole bandwidth, carry out the FFT conversion after, and through deinterleaving, obtain a string CCE that has identical numbering with the eNB end;
Step 2:UE begins to carry out blind Detecting from being combined as 1-CCE, at first according to oneself sign (ID, Identity), calculation of parameter such as subframe sequence number goes out the original position of 1-CCE, promptly begin to carry out blind Detecting, and then determine the search volume according to the number of candidate's control channel from being numbered several CCE.For example, the original position of 1-CCE is CCE 5, and then the search volume of UE is { CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE 10}.That is to say that UE will carry out blind Detecting respectively to [CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE10].
Step 3: if when being combined as 1-CCE and carrying out blind Detecting, UE does not detect the UE ID that is complementary with oneself, then begins to carry out blind Detecting from being combined as 2-CCE again.At first still to go out the original position of 2-CCE according to the calculation of parameter such as UE-ID, subframe sequence number of oneself, and then determine the search volume according to the number of candidate's control channel.For example, the 2-CCE original position is CCE 10, then the search volume of UE be [CCE 10 CCE 11], [CCE12 CCE 13] ..., [CCE 20 CCE 21].That is to say, UE will to [CCE 10 CCE11], [CCE 12 CCE 13] ..., [CCE 20 CCE 21] carry out blind Detecting respectively.The rest may be inferred.
Step 4: if in whole blind detection process, UE does not listen to the UE ID that is complementary with oneself, and illustrating does not have one's own control signaling to assign this moment, and then UE switches to sleep pattern; If listened to after the UE ID that is complementary with oneself, UE will go the corresponding business information of demodulation according to the indication of control signaling.
Introducing via node (Relay Node, abbreviation " RN ") in the mobile communication system, as shown in Figure 1, base station (Enhanced Node B, be called for short " eNB ") and RN between link be called repeated link (Backhaul Link, be also referred to as back haul link), the link between the user under RN and its coverage is called access link (Access Link), the link (DirectLink) that is referred to as to direct transfer of the link between the UE under eNB and its coverage.Concerning eNB, RN just is equivalent to a UE; Concerning UE, RN just is equivalent to eNB.
The operation that RN can not send simultaneously and receive is disturbed in transmitting-receiving for fear of RN self on same frequency resource.When RN sends down control channel for its subordinate UE, just can not receive down control channel from eNB.Therefore, when downlink transfer, RN sends Downlink Control Information at first on preceding 1 or 2 OFDM symbol its subordinate's UE, in a period of time scope, carry out then from being transmitted into the switching of reception, after switching is finished, on the OFDM of back symbol, receive data, comprising control and professional from eNB.That is to say that eNB is to be carried on the Physical Resource Block (Physical Resource Block abbreviates " PRB " as) to the down control channel that RN sends.
36.912 middle regulation, eNB is called R-PDCCH (PDCCH of Relay) to the down control channel that RN sends, comprising the information such as up-downgoing scheduling authorization of RN.ENB reserves one group of PRB semi-staticly and is used for transmitting R-PDCCH, as shown in Figure 2.Wherein, R-PDCCH can take the PRB of all reservations, also can only take a part of PRB wherein; Can take all OFDM symbols of above-mentioned PRB, also can only take preceding 1 to 2 OFDM symbol of above-mentioned PRB.That is to say that eNB is the transmission of R-PDCCH and reserve one group of PRB semi-staticly, is not to have carried R-PDCCH all, specifically which PRB has really carried R-PDCCH, is each subframe dynamically changeable.Wherein, those PRB that do not carry R-PDCCH can be used for transmitting physical DSCH Downlink Shared Channel (Physical Downlink Shared Channel, abbreviate " PDSCH " as) or the Physical Downlink Shared Channel (Relay-Physical Downlink Shared Channel abbreviates " R-PDSCH " as) of RN.
This shows that UE is the receiving demodulation PDCCH of full bandwidth, and blind Detecting CCE, and RN only knows in advance which PRB eNB has reserved semi-staticly and be used for carrying R-PDCCH, but it and do not know in each subframe which PRB has really carried R-PDCCH on earth.If R-PDCCH is the same with PDCCH, be interweaved together, RN wants to detect own R-PDCCH so, carry out twice blind Detecting: the 1st time, the PRB of actual bearer R-PDCCH is measured in blind check, and deinterleaving obtains a string R-CCE; The 2nd time, blind Detecting R-CCE finally finds one's own R-PDCCH.Because the RN and the number of PRB of R-PDCCH of not known actual bearer in every subframe, therefore, RN need carry out blind Detecting to different PRB numbers.That is to say that the total degree of RN blind Detecting R-PDCCH equals: the blind check number of times of the 1st time blind check number of times * 2nd time.For example, the distribution that eNB is semi-static 20 PRB be used to carry R-PDCCH, and the PRB number of the actual use of the R-PDCCH of certain subframe is 15.RN when carrying out blind Detecting, and do not know specifically be what, therefore can only adopt the method for traversal, promptly at first detect the situation of 20 PRB, it's not true, detects the situation of 19 PRB again ..., up to detecting 15 PRB.And RN will separate the CCE level at least when detecting above-mentioned various PRBs combination, carries out just determining whether to comprise one's own R-PDCCH after the blind Detecting of similar Rel-8 according to 1 or 2 CCE again.
Therefore, the inventor finds the detection method according to the down control channel in the correlation technique, can cause the blind Detecting number of times of R-PDCCH to increase greatly, and the blind Detecting time delay also can extend greatly.
Summary of the invention
Blind Detecting number of times at the R-PDCCH in the correlation technique is more, the blind Detecting time delay proposes the present invention than long problem, and for this reason, main purpose of the present invention is to provide a kind of detection method and system of down control channel.
To achieve these goals, according to an aspect of the present invention, a kind of detection method of down control channel is provided, it comprises: the base station sends signaling to via node, wherein, signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, perhaps carries the information of the number that is used for the actual shared Physical Resource Block of bearing downlink control channel; Via node obtains Physical Resource Block to be detected according to information; Via node carries out blind Detecting according to Physical Resource Block to be detected to the Physical Resource Block by base station assigns.
Further, signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, wherein, via node obtains Physical Resource Block to be detected according to information and comprises: via node obtains the detection set of Physical Resource Block that needs carry out the down control channel of blind Detecting according to information, wherein, detect at least a portion that set comprises the Physical Resource Block of semi-static configuration; Via node carries out blind Detecting according to Physical Resource Block to be detected to the Physical Resource Block by base station assigns and comprises: the number of selecting a kind of Physical Resource Block one by one from detect set; Number according to the selected Physical Resource Block that goes out is determined Physical Resource Block to be detected; Via node carries out blind Detecting according to Physical Resource Block to be detected to the Physical Resource Block by base station assigns.
Further, determine that according to the number of the selected Physical Resource Block that goes out Physical Resource Block to be detected comprises: via node finds out the corresponding Physical Resource Block to be detected of number with the selected Physical Resource Block that goes out in the mapping table of this locality.
Further, the base station sends signaling to via node and comprises: send the signaling that carries common control information, wherein, common control information comprises that the number that is used for the actual shared Physical Resource Block of bearing downlink control channel and common control information and dedicated control information do not interweave, and is mapped on the fixing physics running time-frequency resource.
Further, the base station sends signaling to via node and comprises: send the signaling that carries common control information, wherein, common control information comprises that the number that is used for the actual shared Physical Resource Block of bearing downlink control channel and common control information and dedicated control information interweave, and is mapped on the common search space.
Further, via node obtains Physical Resource Block to be detected according to information and comprises: the Physical Resource Block by base station assigns is carried out blind Detecting, perhaps blind Detecting is carried out in the detection set of the Physical Resource Block of down control channel, obtain common control information; Extract the number that is used for the actual shared Physical Resource Block of bearing downlink control channel from common control information; Determine Physical Resource Block to be detected according to the number that is used for the actual shared Physical Resource Block of bearing downlink control channel.
Further, determine that according to the number that is used for the actual shared Physical Resource Block of bearing downlink control channel Physical Resource Block to be detected comprises: the mapping table of via node in this locality finds out the corresponding Physical Resource Block to be detected of number of the Physical Resource Block actual shared with being used for the bearing downlink control channel.
To achieve these goals, according to another aspect of the present invention, a kind of checkout gear of down control channel is provided, it comprises: base station and via node, the base station is used for sending signaling to via node, and wherein, signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, perhaps, carry the information of the number that is used for the actual shared Physical Resource Block of bearing downlink control channel; Via node is used for obtaining Physical Resource Block to be detected and according to Physical Resource Block to be detected Physical Resource Block by base station assigns being carried out blind Detecting according to information.
Further, signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, via node comprises: acquisition module, be used for obtaining the detection set of Physical Resource Block that needs carry out the down control channel of blind Detecting according to information, wherein, detect at least a portion that set comprises the Physical Resource Block of semi-static configuration; Select module, be used for selecting a kind of number of Physical Resource Block from detecting set one by one; Determination module is used for determining Physical Resource Block to be detected according to the number of the selected Physical Resource Block that goes out; Detection module is used for according to Physical Resource Block to be detected Physical Resource Block by base station assigns being carried out blind Detecting.
Further, the information that is used for the number of the actual shared Physical Resource Block of bearing downlink control channel is positioned at common control information, wherein, common control information and dedicated control information do not interweave and are mapped on the fixing physics running time-frequency resource, perhaps, interweave with dedicated control information and be mapped on the common search space.
The present invention has following beneficial effect:
In the present invention, it is actually used in the number of the Physical Resource Block of bearing downlink control channel by the signaled via node in the base station, thereby guaranteed that via node has lower complexity when the blind Detecting down control channel, less blind Detecting time delay, improved whole system efficient, and the PRB configuration flexibility that has guaranteed to carry R-PDCCH, make that the backhaul resource is utilized fully.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the wireless communication system framework of Relay after the introducing of correlation technique;
Fig. 2 is the schematic diagram according to the R-PDCCH of correlation technique and PDCCH position relation;
Fig. 3 is the flow chart according to the detection method of the down control channel of the embodiment of the invention;
Fig. 4 is the schematic diagram according to the checkout gear of the down control channel of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
The embodiment of the invention is based on wireless communication system shown in Figure 1, and mainly be that the communication process that is used for down control channel between base station and the via node is improved, wherein, above-mentioned wireless communication system comprises: base station, user terminal, relay station (also claiming via node).
Fig. 3 is the flow chart according to the detection method of the down control channel of the embodiment of the invention.As shown in Figure 3, the detection method of this down control channel mainly may further comprise the steps:
S302, the base station sends signaling to via node, wherein, this signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, perhaps carries the information of the number that is used for the actual shared Physical Resource Block of bearing downlink control channel;
S304, via node obtains Physical Resource Block to be detected according to above-mentioned information;
S306, via node carries out blind Detecting according to Physical Resource Block to be detected to the Physical Resource Block by base station assigns.
In correlation technique, via node can't be known the number of the Physical Resource Block of the actual use in base station, and via node increases greatly for the blind Detecting number of times of R-PDCCH like this.And according to the method for the embodiment of the invention, it is actually used in the number of the Physical Resource Block of bearing downlink control channel by the signaled via node in the base station, perhaps, base station and via node are reserved in advance in advance, according to the number of the Physical Resource Block of the down control channel of the semi-static configuration of high-level signaling notice, just can obtain to be used for the set of number of the Physical Resource Block of bearing downlink control channel.Like this, via node is after the set of knowing above-mentioned number or above-mentioned number, can promptly can detect the number of the Physical Resource Block that is used for the bearing downlink control channel by less detection number of times, thereby guaranteed that via node has lower complexity when the blind Detecting down control channel, less blind Detecting time delay, improved whole system efficient, and guaranteed the PRB configuration flexibility of carrying R-PDCCH, made that the backhaul resource is utilized fully.
When signaling is carried the information of number of Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, described via node obtains the detection set of Physical Resource Block that needs carry out the down control channel of blind Detecting according to described information, wherein, described detection set comprises at least a portion of the Physical Resource Block of described semi-static configuration; Then, from described detection set, select a kind of number of Physical Resource Block one by one; Number according to the selected Physical Resource Block that goes out is determined described Physical Resource Block to be detected; Described via node carries out blind Detecting according to described Physical Resource Block to be detected to the Physical Resource Block by described base station assigns.
Concrete, the base station can define the various situations of the number of the Physical Resource Block that can be used to the bearing downlink control channel in advance with via node, for example, the base station is 20 by the number of the PRB of the semi-static reservation of high-level signaling notice via node, then the number of the PRB of the via node semi-static reservation that can send according in advance agreement and base station knows that the detected set of Physical Resource Block that needs carry out the down control channel of blind Detecting is combined into 18,16,14 PRB, promptly, the number bearing downlink control channel of a kind of PRB only may be selected in the base station in above-mentioned detection set, for example, the base station adopts 16 PRB to come the bearing downlink control channel.
Preferably, via node determines that according to the number of the selected Physical Resource Block that goes out described Physical Resource Block to be detected comprises: via node finds out the corresponding Physical Resource Block to be detected of number with the selected Physical Resource Block that goes out in the mapping table of this locality.
In this case, via node will select a kind of number of Physical Resource Block to come the Physical Resource Block by base station assigns is carried out blind Detecting from set one by one.For example, in set is under the situation of 18,16,14 PRB, via node at first selects 18 PRB to carry out blind Detecting from 20 PRB of base station assigns, if the CCE information of measuring according to blind check, can't obtain R-PDCCH information, then via node selects 16 PRB to carry out blind Detecting from 20 PRB of base station assigns again, till the CCE information of measuring according to blind check can obtain R-PDCCH information.In this way, under the situation that does not increase expense, can reduce the number of times of blind Detecting.
Preferably, the above-mentioned information that is used for the number of the actual shared Physical Resource Block of bearing downlink control channel can be positioned at common control information, wherein, this common control information and dedicated control information do not interweave and are mapped on the fixing physics running time-frequency resource, perhaps, above-mentioned control information altogether also can interweave with dedicated control information and be mapped on the common search space.
Be arranged in above-mentioned information and do not interweave with dedicated control information and be carried under the situation of the common control information on the fixing running time-frequency resource of frame, via node receive that the base station sends carry the signaling of common control information the time, can from the running time-frequency resource of said fixing, know common control information earlier, then, extract the number of the Physical Resource Block that is actually used in the bearing downlink control channel from common control information.Then, select the PRB of above-mentioned number to carry out blind Detecting from the PRB of base station assigns, the CCE information of measuring by blind check determines whether to obtain R-PDCCH information.In this way, can further reduce the number of times of blind Detecting.
Be arranged in above-mentioned information and interweave with dedicated control information and be mapped under the situation of the common control information on the common search space, via node can't be known the position of common control information in frame in advance.Therefore, receive that the base station sends carry the signaling of common control information the time, via node can carry out blind Detecting to the Physical Resource Block by base station assigns earlier, perhaps blind Detecting is carried out in the detection set that limits, thereby acquisition common control information, then, extract the number of the Physical Resource Block that is actually used in the bearing downlink control channel from common control information.
Preferably, then, described via node finds out in the mapping table of this locality and the described corresponding Physical Resource Block to be detected of number that is used for the actual shared Physical Resource Block of bearing downlink control channel.
Then, select Physical Resource Block to be detected to carry out blind Detecting from the PRB of base station assigns, the CCE information of measuring by blind check determines whether to obtain R-PDCCH information.In this way, can under the situation that does not increase expense, further reduce the number of times of blind Detecting.
Describe embodiment under the above-mentioned different detection mode in detail below by concrete parameter.
The scene that present embodiment adopted is: base station and via node define the set of the number of the PRB that is actually used in carrying R-PDCCH in advance.
Suppose that eNB has reserved 20 PRB semi-staticly and has been used to carry R-PDCCH, and the R-PDCCH that had only 14 PRB actual bearer on certain subframe remains 6 PRB transmission PDSCH/R-PDSCH.Because RN is when carrying out blind Detecting, and the R-PDCCH that do not known specifically to have what PRB actual bearer, if therefore according to the method for routine, promptly do not limit the detection combination of PRB, just can only adopt the traversal method, promptly at first detect the situation of 20 PRB, it's not true, detects the situation of 19 PRB again ... up to detecting 14 PRB, could correctly demodulate R-PDCCH.Like this, the blind check total degree is exactly: the number of times of 7 * blind Detecting CCE.If the PRB of actual bearer R-PDCCH has only 2, the blind check number of times is exactly the number of times of 19 * blind Detecting CCE so.
According to the method for present embodiment, for example, be used to carry R-PDCCH if eNB has reserved N PRB semi-staticly, eNB and RN consult mutually so, R-PDCCH can only
Individual PRB goes up carrying, and wherein, a and b are positive integer, and b≤a.For example, can only be at N,
Individual PRB goes up carrying, promptly can only be carried on 20,14,10,7, and 4,2 PRB go up carrying.Therefore, according to the method for present embodiment, the detection combination of the PRB of RN 6 have been reduced to, RN at first detects the situation of 20 PRB, and it's not true, detects 14 PRB, just can demodulate correct CCE this moment, and then CCE is carried out blind Detecting, to obtain the R-PDCCH of oneself.At this moment, the blind check total degree is: the number of times of 2 * blind Detecting CCE.
The scene that present embodiment adopted is: the base station is actually used in the number of the PRB of carrying R-PDCCH by the signaled via node.
In the present embodiment, the base station uses independently that common control information comprises the described number that is used for the Physical Resource Block of bearing downlink control channel, this independently common control information can refer to the common control information that does not interweave with dedicated control information.
Concrete, above-mentioned common control information is an independently public control area.Mark a relay resource (backhaul resource) specially, for example 1 or a plurality of PRB are as public control area independently.
For example, semi-staticly reserved 20 PRB, the number of the PRBs of actual bearer R-PDCCH is 15.At this moment, public control area need be indicated the number of the PRBs of actual bearer R-PDCCH with 5 bits, and the detection step of RN is as follows:
Information in step 1:RN reception and the demodulation public domain will obtain 01111, and the number of just representing the PRBs of actual bearer R-PDCCH is 15.
Step 2: in the PRB of semi-static reservation, receive 15 PRB that previous step obtains,, obtain a string CCE through demodulation and deinterleaving.
Step 3: a string CCE that step 2 is obtained carries out the blind Detecting of similar Rel-8, to obtain the R-PDCCH of oneself.
Embodiment 3
The scene that present embodiment adopted is: the base station is actually used in the number of the PRB of carrying R-PDCCH by the signaled via node.
In the present embodiment, common search space (Common Search Space) carrying common control information is used in the base station, and wherein, this common control information comprises the described number that is used for the Physical Resource Block of bearing downlink control channel.
Because above-mentioned common control information and dedicated control information are weave ins, therefore, the blind Detecting step of RN is specific as follows:
Step 1:RN carries out blind Detecting according to N PRBs of double static reservations of method among the embodiment 1, so that find the PRB at place, common search space.Preferably, can be defined for the number set of the PRB of carrying common control information in advance, for example the number set of PRB can be defined as a kind of number (as,
Individual PRB) or 2 kinds of numbers (as,
Individual PRB,
Individual PRB), thereby RN receives and demodulates common control information, and obtains to be actually used in the number of the PRB of carrying R-PDCCH from described common control information, for example
Individual.
Step 2: in the PRB of semi-static reservation, the reception previous step obtains
Individual PRB through demodulation and deinterleaving, obtains a string CCE.
Step 3: a string CCE that step 2 is obtained carries out the blind Detecting of similar Rel-8, to obtain the R-PDCCH of oneself.
According to the method for embodiment 3, the blind Detecting that RN only need will travel through the common search space, and the blind Detecting that need not travel through dedicated search space (Specific Search Space).Thereby do not having to have reduced the number of times of blind Detecting under the extra expense situation.
According to the embodiment of the invention, also provide a kind of detection system of down control channel.As shown in Figure 4, the detection system of this down control channel comprises: base station 402 and via node 404.
Preferably, above-mentioned base station comprises module 4021 and sending module 4022 is set.And via node 404 comprises receiver module 4041, acquisition module 4042, selects module 4043, determination module 4044 and detection module 4045.
In working order down, module 4021 is set the information relevant with the number of the Physical Resource Block that is used for the bearing downlink control channel is set, then, sending module 4022 sends the signaling that carries above-mentioned information to via node 404.
At receiving terminal, the receiver module 4041 of via node 404 receives above-mentioned signaling.What carry in above-mentioned signaling is to be used under the situation of information of number of Physical Resource Block of semi-static configuration of bearing downlink control channel, acquisition module 4042 obtains the detection set of Physical Resource Block that needs carry out the down control channel of blind Detecting according to above-mentioned information, wherein, above-mentioned detection set comprises at least a portion of the Physical Resource Block of above-mentioned semi-static configuration.Then, select module 4043 from above-mentioned detection set, to select a kind of number of Physical Resource Block one by one.Then, determination module 4044 is determined above-mentioned Physical Resource Block to be detected according to the number of the selected Physical Resource Block that goes out.Then, detection module 4045 carries out blind Detecting according to above-mentioned Physical Resource Block to be detected to the Physical Resource Block by above-mentioned base station assigns, if do not detect the corresponding downstream control channel, then select module 4043 to reselect a kind of number of Physical Resource Block, determination module 4044 repeats operation with detection module 4045, up to detecting the corresponding downstream control channel.
Preferably, via node 404 determines that according to the number of the selected Physical Resource Block that goes out above-mentioned Physical Resource Block to be detected comprises: via node finds out the corresponding Physical Resource Block to be detected of number with the selected Physical Resource Block that goes out in the mapping table of this locality.
What carry in above-mentioned signaling is to be used under the situation of information of number of the actual shared Physical Resource Block of bearing downlink control channel, and determination module 4044 is directly determined above-mentioned Physical Resource Block to be detected from the information that receives.Preferably, via node 404 finds out in the mapping table of this locality and the above-mentioned corresponding Physical Resource Block to be detected of number that is used for the actual shared Physical Resource Block of bearing downlink control channel.
Then, detection module 4045 carries out blind Detecting according to above-mentioned Physical Resource Block to be detected to the Physical Resource Block by above-mentioned base station assigns.
Preferably, the described information that is used for the number of the actual shared Physical Resource Block of bearing downlink control channel is positioned at common control information, wherein, described common control information and dedicated control information do not interweave and are mapped on the fixing physics running time-frequency resource, perhaps, interweave with described dedicated control information and be mapped on the common search space.
Detection system according to the down control channel of the embodiment of the invention, it is actually used in the number of the Physical Resource Block of bearing downlink control channel by the signaled via node in the base station, perhaps, base station and via node are reserved in advance in advance, according to the number of the Physical Resource Block of the down control channel of the semi-static configuration of high-level signaling notice, just can obtain to be used for the set of number of the Physical Resource Block of bearing downlink control channel.Like this, via node is after the set of knowing above-mentioned number or above-mentioned number, can promptly can detect the number of the Physical Resource Block that is used for the bearing downlink control channel by less detection number of times, thereby guaranteed that via node has lower complexity when the blind Detecting down control channel, less blind Detecting time delay, improved whole system efficient, and guaranteed the PRB configuration flexibility of carrying R-PDCCH, made that the backhaul resource is utilized fully.
Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the detection method of a down control channel is characterized in that, comprising:
The base station sends signaling to via node, wherein, described signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, perhaps carries the information of the number that is used for the actual shared Physical Resource Block of bearing downlink control channel;
Described via node obtains Physical Resource Block to be detected according to described information;
Described via node carries out blind Detecting according to described Physical Resource Block to be detected to the Physical Resource Block by described base station assigns.
2. method according to claim 1 is characterized in that, described signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, wherein,
Described via node obtains Physical Resource Block to be detected according to described information and comprises:
Described via node obtains the detection set of Physical Resource Block that needs carry out the down control channel of blind Detecting according to described information, and wherein, described detection set comprises at least a portion of the Physical Resource Block of described semi-static configuration;
Described via node carries out blind Detecting according to described Physical Resource Block to be detected to the Physical Resource Block by described base station assigns and comprises:
From described detection set, select a kind of number of Physical Resource Block one by one;
Number according to the selected Physical Resource Block that goes out is determined described Physical Resource Block to be detected;
Described via node carries out blind Detecting according to described Physical Resource Block to be detected to the Physical Resource Block by described base station assigns.
3. method according to claim 2 is characterized in that, determines that according to the number of the selected Physical Resource Block that goes out described Physical Resource Block to be detected comprises:
Described via node finds out the corresponding Physical Resource Block to be detected of number with the selected Physical Resource Block that goes out in the mapping table of this locality.
4. method according to claim 1 is characterized in that, the base station sends signaling to via node and comprises:
Transmission carries the signaling of common control information, wherein, described common control information comprises that described number that is used for the actual shared Physical Resource Block of bearing downlink control channel and described common control information and dedicated control information do not interweave, and is mapped on the fixing physics running time-frequency resource.
5. method according to claim 1 is characterized in that, the base station sends signaling to via node and comprises:
Transmission carries the signaling of common control information, wherein, described common control information comprises that described number that is used for the actual shared Physical Resource Block of bearing downlink control channel and described common control information and dedicated control information interweave, and is mapped on the common search space.
6. according to claim 4 or 5 described methods, it is characterized in that described via node obtains Physical Resource Block to be detected according to described information and comprises:
Physical Resource Block by described base station assigns is carried out blind Detecting, perhaps blind Detecting is carried out in the detection set of the Physical Resource Block of down control channel, obtain described common control information;
Extract the described number that is used for the actual shared Physical Resource Block of bearing downlink control channel from described common control information;
Determine described Physical Resource Block to be detected according to the described number that is used for the actual shared Physical Resource Block of bearing downlink control channel.
7. method according to claim 6 is characterized in that, determines that according to the described number that is used for the actual shared Physical Resource Block of bearing downlink control channel described Physical Resource Block to be detected comprises:
Described via node finds out in the mapping table of this locality and the described corresponding Physical Resource Block to be detected of number that is used for the actual shared Physical Resource Block of bearing downlink control channel.
8. the detection system of a down control channel comprises base station and via node, it is characterized in that,
Described base station is used for sending signaling to via node, wherein, described signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, perhaps, carries the information of the number that is used for the actual shared Physical Resource Block of bearing downlink control channel;
Described via node is used for obtaining Physical Resource Block to be detected and according to described Physical Resource Block to be detected Physical Resource Block by described base station assigns being carried out blind Detecting according to described information.
9. system according to claim 8 is characterized in that, described signaling is carried the information of number of the Physical Resource Block of the semi-static configuration that is used for the bearing downlink control channel, and described via node comprises:
Acquisition module is used for obtaining the detection set of Physical Resource Block that needs carry out the down control channel of blind Detecting according to described information, and wherein, described detection set comprises at least a portion of the Physical Resource Block of described semi-static configuration;
Select module, be used for selecting from described detection set one by one a kind of number of Physical Resource Block;
Determination module is used for determining described Physical Resource Block to be detected according to the number of the selected Physical Resource Block that goes out;
Detection module is used for according to described Physical Resource Block to be detected Physical Resource Block by described base station assigns being carried out blind Detecting.
10. system according to claim 8, it is characterized in that, the described information that is used for the number of the actual shared Physical Resource Block of bearing downlink control channel is positioned at common control information, wherein, described common control information and dedicated control information do not interweave and are mapped on the fixing physics running time-frequency resource, perhaps, interweave with described dedicated control information and be mapped on the common search space.
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| CN201010156581.XA CN102215507B (en) | 2010-04-02 | 2010-04-02 | Method and system for detecting downlink control channel |
| PCT/CN2011/071745 WO2011120375A1 (en) | 2010-04-02 | 2011-03-11 | Detection method and system for downlink control channel |
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| CN201010156581.XA CN102215507B (en) | 2010-04-02 | 2010-04-02 | Method and system for detecting downlink control channel |
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Also Published As
| Publication number | Publication date |
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| CN102215507B (en) | 2015-07-22 |
| WO2011120375A1 (en) | 2011-10-06 |
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