CN102215507B - Method and system for detecting downlink control channel - Google Patents
Method and system for detecting downlink control channel Download PDFInfo
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- CN102215507B CN102215507B CN201010156581.XA CN201010156581A CN102215507B CN 102215507 B CN102215507 B CN 102215507B CN 201010156581 A CN201010156581 A CN 201010156581A CN 102215507 B CN102215507 B CN 102215507B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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 introducing via node in a wireless communication system, reduce via node to the method for the blind Detecting complexity of the down control channel (R-PDCCH, Relay Physical DownlinkControl Channel) from (eNB).
Because future wireless system or cellular system require to increase coverage, support higher rate transmission, this proposes new challenge to wireless communication technology.Meanwhile, the cost issues of system building and maintenance is more outstanding.Along with the increase of transmission rate and communication distance, the energy consumption issues of battery also becomes outstanding, and the radio communication in future will adopt higher frequency, and the pathloss attenuation caused 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, introduce relaying (Relay) technology in wireless communication system, therefore relaying technique is regarded as a key technology of 4G.
At Long Term Evolution (LTE, Long term Evolution) in communication system, the design of down control channel (PDCCH, Physical Downlink Control Channel) is made up of several different part, and each part has its specific function.For convenience of description, several term and agreement is defined below:
1. Resource Unit (RE, Resource Element): minimum time/frequency source block, occupies 1 subcarrier in 1 OFDM symbol.
2. resource unit group (REG, Resource Element Group): according to the difference of reference symbol position in 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 compositions, the information comprised in CCE has: the descending scheduling authorization message (DL grant) of user and uplink scheduling authorization information (UL grant), and and system message (SI, System Information), Stochastic accessing (RA, Random Access) response, the information that paging (Paging) is relevant.
The combining form of 4.Aggregation level L:CCE, namely PDCCH can only be made up of L CCE, wherein L ∈ { 1, 2, 4, 8}, that is, PDCCH can only by the combination of 1 CCE (representing with 1-CCE), the combination (representing with 2-CCE) of 2 CCE, the combination (representing with 4-CCE) of 4 CCE and the combination (representing with 8-CCE) of 8 CCE are formed, and 4 kinds of different code rates that above-mentioned 4 kinds of different combinations are corresponding respectively, namely 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, the code rate of 8-CCE is 1/12.
5. search volume (SS, Search Space): search volume is made up of some groups of candidate control channels, and UE monitors search volume, and carries out blind Detecting in search volume, to detect and oneself respective impact control channel.
6. the search volume of liang type: one is public search space (UE-commonSearch Space), the i.e. search volume that all will monitor of all UE, wherein, carrying be and SI, RA respond and Paging is relevant public information; Another kind is the special search volume (UE-specific Search Space) of UE, and what wherein carry is UE up-downgoing scheduling authorization information separately.
7. different CCE aggregation level has the number of its corresponding candidate control channel, is the maximum times of blind Detecting.Such as, under UE-specific Search Space: the candidate control channel of 1-CCE is 6, the number of times namely carrying out blind Detecting by 1 CCE mono-group is no more than 6 times; The candidate control channel of 2-CCE is 6, and the number of times namely carrying out blind Detecting by 2 CCE mono-group is no more than 6 times; The candidate control channel of 4-CCE is 2, and the number of times namely carrying out blind Detecting by 4 CCE mono-group is no more than 2 times; The candidate control channel of 8-CCE is 2, and the number of times namely carrying out blind Detecting by 8 CCE mono-group is no more than 2 times.Under UE-common Search Space, the candidate control channel of 4-CCE is 4, and the number of times namely carrying out blind Detecting by 4 CCE mono-group is no more than 4 times; The candidate control channel of 8-CCE is 2, and the number of times namely carrying out blind Detecting by 8 CCE mono-group is no more than 2 times.
In LTE system, UE carries out the detailed process of blind Detecting to PDCCH:
1) at eNB end, process of transmitting mainly comprises the following steps:
Step 1: respectively chnnel coding is carried out to the PDCCH of each UE;
Step 2: the PDCCH of all UE after coding is together in series, carries out scrambling by the sequence of cell-specific;
Step 3: carry out QPSK modulation, that now obtain is a string CCE corresponding to all PDCCH, and they is numbered from 0; Suppose that down control channel is now made up of 32 CCE altogether, namely they be numbered CCE 0, CCE 1 ..., CCE 31;
Step 4: be mapped on the running time-frequency resource at PDCCH place after unit interweaves with REG by above-mentioned a string CCE, wherein, frequency domain occupies whole system bandwidth, time domain specifically occupies several symbol to be indicated in detail by Physical Control Format Indicator Channel (PCFICH, Physical Control Format Indicate Channel);
Step 5: carry out going out after IFFT conversion is launched.
2) at UE end, receiving course mainly comprises the following steps:
Step 1: receiving terminal receives the PDCCH in whole bandwidth, after carrying out FFT conversion, and through deinterleaving, obtains holding a string CCE with identical numbering with eNB;
Step 2:UE carries out blind Detecting from being combined as 1-CCE, first according to the mark (ID of oneself, Identity), the calculation of parameter such as subframe sequence number goes out the original position of 1-CCE, namely from being numbered several CCE, carry out blind Detecting, and then determine search volume according to the number of candidate control channel.Such as, the original position of 1-CCE is CCE 5, then the search volume of UE is { CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE 10}.That is, UE will carry out blind Detecting respectively to [CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE10].
Step 3: if according to be combined as 1-CCE carry out blind Detecting time, UE does not detect the UE ID matched with oneself, then from being combined as 2-CCE, carry out blind Detecting again.First still to go out the original position of 2-CCE according to calculation of parameter such as the UE-ID of oneself, subframe sequence numbers, and then determine search volume according to the number of candidate control channel.Such as, 2-CCE original position is CCE 10, then the search volume of UE is { [CCE 10 CCE 11], [CCE12 CCE 13] ..., [CCE 20 CCE 21] }.That is, 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 matched with oneself, and illustrate and now do not have one's own control signal to assign, then UE is switched to sleep pattern; If after having listened to the UE ID matched with oneself, the business information that the instruction according to control signal goes demodulation corresponding by UE.
At introducing via node (Relay Node, be called for short " RN ") mobile communication system in, 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, also referred to as back haul link), link between user under RN and its coverage is called access link (Access Link), and the link between the UE under eNB and its coverage is referred to as the link (DirectLink) that direct transfers.Concerning eNB, RN is just equivalent to a UE; Concerning UE, RN is just equivalent to eNB.
In order to avoid the transmitting-receiving of RN self is disturbed, RN can not carry out the operation sending and receive in same frequency resource simultaneously.When RN sends down control channel to its subordinate UE, just can not receive the down control channel from eNB.Therefore, when downlink transfer, RN sends Downlink Control Information first in front 1 or 2 OFDM symbol the UE of its subordinate, then within a period of time, carry out the switching from being transmitted into reception, after having switched, OFDM symbol below receives the data from eNB, comprising control and business.That is, eNB is be carried on Physical Resource Block (Physical Resource Block, referred to as " PRB ") to the down control channel that RN sends.
Specify in 36.912, 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 semi-statically reserved one group of PRB is used for transmitting R-PDCCH, as shown in Figure 2.Wherein, R-PDCCH can take all reserved PRB, also only can take a part of PRB wherein; All OFDM symbol of above-mentioned PRB can be taken, also only can take front 1 to 2 OFDM symbol of above-mentioned PRB.That is, eNB is the transmission of R-PDCCH and semi-statically reserves one group of PRB, and not all carry R-PDCCH, specifically which PRB really carries R-PDCCH, is each subframe dynamically changeable.Wherein, those PRB not carrying R-PDCCH can be used for transmitting physical DSCH Downlink Shared Channel (Physical Downlink Shared Channel, referred to as " PDSCH ") or the Physical Downlink Shared Channel (Relay-Physical Downlink Shared Channel, referred to as " R-PDSCH ") of RN.
As can be seen here, UE is the receiving demodulation PDCCH of full bandwidth, and blind Detecting CCE, and RN only knows which PRB eNB has semi-statically reserved and be used for carrying R-PDCCH in advance, but it and do not know in each subframe, which PRB really carries R-PDCCH on earth.If R-PDCCH with PDCCH is the same, be interweaved together, so RN wants to detect oneself R-PDCCH, 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; 2nd time, blind Detecting R-CCE, finally finds one's own R-PDCCH.Do not know the number of the PRB of the R-PDCCH of actual bearer in every subframe due to RN, therefore, RN needs to carry out blind Detecting to different PRB number.That is, the total degree of RN blind Detecting R-PDCCH equals: the blind check number of times of blind check number of times × 2nd of the 1st time time.Such as, what eNB was semi-static is assigned with 20 PRB for carrying 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 does not know specifically how many, and therefore can only adopt the method for traversal, namely first detect the situation of 20 PRB, it's not true, then detect the situation of 19 PRB ..., until 15 PRB detected.And RN is when detecting above-mentioned various PRBs combination, at least will separate CCE level, more just can determine whether to comprise one's own R-PDCCH after carrying out the blind Detecting of similar Rel-8 according to 1 or 2 CCE.
Therefore, inventor finds the detection method according to the down control channel in correlation technique, the blind Detecting number of times of R-PDCCH can be caused greatly to increase, and blind Detecting time delay also can lengthen greatly.
Summary of the invention
For the R-PDCCH in correlation technique the problem that blind Detecting number of times is more, blind Detecting time delay is longer and the present invention is proposed, for this reason, main purpose of the present invention is the detection method and the system that provide a kind of down control channel.
To achieve these goals, according to an aspect of the present invention, provide a kind of detection method of down control channel, it comprises: base station sends signaling to via node, wherein, signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, or carries the information of the number for the Physical Resource Block shared by bearing downlink control channel reality; Via node is according to acquisition of information 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, signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, wherein, via node comprises according to the Physical Resource Block that acquisition of information is to be detected: via node needs the detection set of the Physical Resource Block of the down control channel carrying out blind Detecting according to acquisition of information, wherein, detect set and comprise the Physical Resource Block of semi-static configuration at least partially; 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: one by one from detecting the number selecting a kind of Physical Resource Block set; According to selected go out the number of Physical Resource Block determine 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, according to selected go out the number of Physical Resource Block determine that Physical Resource Block to be detected comprises: via node find out in the mapping table of this locality with selected go out Physical Resource Block to be detected corresponding to the number of Physical Resource Block.
Further, base station sends signaling to via node and comprises: send the signaling carrying common control information, wherein, common control information comprises number for the Physical Resource Block shared by bearing downlink control channel reality and common control information and dedicated control information do not interweave, and is mapped on fixing physical time-frequency resource.
Further, base station sends signaling to via node and comprises: send the signaling carrying common control information, wherein, common control information comprises number for the Physical Resource Block shared by bearing downlink control channel reality and common control information and dedicated control information interweave, and is mapped on public search space.
Further, via node comprises according to the Physical Resource Block that acquisition of information is to be detected: carry out blind Detecting to the Physical Resource Block by base station assigns, or carries out blind Detecting to the detection set of the Physical Resource Block of down control channel, obtains common control information; The number of the Physical Resource Block be used for shared by bearing downlink control channel reality is extracted from common control information; Physical Resource Block to be detected is determined according to the number for the Physical Resource Block shared by bearing downlink control channel reality.
Further, determine that Physical Resource Block to be detected comprises according to the number for the Physical Resource Block shared by bearing downlink control channel reality: via node finds out the to be detected Physical Resource Block corresponding with the number for the Physical Resource Block shared by bearing downlink control channel reality in the mapping table of this locality.
To achieve these goals, according to another aspect of the present invention, provide a kind of checkout gear of down control channel, it comprises: base station and via node, base station is used for sending signaling to via node, and wherein, signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, or, carry the information of the number for the Physical Resource Block shared by bearing downlink control channel reality; Via node is used for according to acquisition of information Physical Resource Block to be detected and carries out blind Detecting according to Physical Resource Block to be detected to the Physical Resource Block by base station assigns.
Further, signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, via node comprises: acquisition module, for needing the detection set of the Physical Resource Block of the down control channel carrying out blind Detecting according to acquisition of information, wherein, detect set and comprise the Physical Resource Block of semi-static configuration at least partially; Select module, for selecting a kind of number of Physical Resource Block one by one from detection set; Determination module, the number for the Physical Resource Block gone out selected by basis determines Physical Resource Block to be detected; Detection module, for carrying out blind Detecting according to Physical Resource Block to be detected to the Physical Resource Block by base station assigns.
Further, information for the number of the Physical Resource Block shared by bearing downlink control channel reality is arranged in common control information, wherein, common control information and dedicated control information do not interweave and are mapped on fixing physical time-frequency resource, or, interweave with dedicated control information and be mapped on public search space.
The present invention has following beneficial effect:
In the present invention, by signaled via node, it is actually used in the number of the Physical Resource Block of bearing downlink control channel in base station, thus ensure that via node has lower complexity when blind Detecting down control channel, less blind Detecting time delay, improve whole system efficiency, and ensure that the flexibility of the PRB configuration carrying R-PDCCH, backhaul resource is utilized fully.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the wireless communication system framework of Relay after the introducing according to correlation technique;
Fig. 2 is the schematic diagram of R-PDCCH and the PDCCH position relationship according to correlation technique;
Fig. 3 is the flow chart of the detection method of down control channel according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of the checkout gear of down control channel according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
The embodiment of the present invention is based on the wireless communication system shown in Fig. 1, and mainly the communication process for down control channel between base station and 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 of the detection method of down control channel according to the embodiment of the present invention.As shown in Figure 3, the detection method of this down control channel mainly comprises the following steps:
S302, base station sends signaling to via node, wherein, this signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, or carries the information of the number for the Physical Resource Block shared by bearing downlink control channel reality;
S304, via node is according to above-mentioned acquisition of information Physical Resource Block to be detected;
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 the related, via node cannot know the number of the Physical Resource Block of the actual use in base station, and such via node increases greatly for the blind Detecting number of times of R-PDCCH.And according to the method for the embodiment of the present invention, by signaled via node, it is actually used in the number of the Physical Resource Block of bearing downlink control channel in base station, or, 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, the set of the number of the Physical Resource Block for bearing downlink control channel just can be obtained.Like this, via node is after the set knowing above-mentioned number or above-mentioned number, namely the number of the Physical Resource Block for bearing downlink control channel can be detected by less detection number of times, thus ensure that via node has lower complexity when blind Detecting down control channel, less blind Detecting time delay, improve whole system efficiency, and ensure that the flexibility of the PRB configuration carrying R-PDCCH, backhaul resource is utilized fully.
When signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, described via node needs the detection set of the Physical Resource Block of the down control channel carrying out blind Detecting according to described acquisition of information, wherein, described detection set comprises the Physical Resource Block of described semi-static configuration at least partially; Then, detect from described the number selecting a kind of Physical Resource Block set one by one; According to selected go out the number of Physical Resource Block determine 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, base station can define the various situations of the number of the Physical Resource Block that can be used to bearing downlink control channel in advance with via node, such as, base station is 20 by the number of the semi-static reserved PRB of high-level signaling notice via node, the number of semi-static reserved PRB that then via node can send according to agreement in advance and base station is known needs the detected set of the Physical Resource Block of the down control channel carrying out blind Detecting to be combined into 18, 16, 14 PRB, namely, the number bearing downlink control channel of a kind of PRB only may be selected in base station in above-mentioned detection set, such as, base station adopts 16 PRB to carry out bearing downlink control channel.
Preferably, via node according to selected by the number of Physical Resource Block that goes out determine that described Physical Resource Block to be detected comprises: via node find out in the mapping table of this locality with selected go out Physical Resource Block to be detected corresponding to the number of Physical Resource Block.
In this case, via node will select a kind of number of Physical Resource Block to carry out blind Detecting to the Physical Resource Block by base station assigns one by one from set.Such as, when set is 18,16,14 PRB, first via node selects 18 PRB to carry out blind Detecting from 20 of base station assigns PRB, if according to the CCE information that blind check is measured, R-PDCCH information cannot be obtained, then via node selects 16 PRB to carry out blind Detecting from 20 of base station assigns PRB again, until the CCE information measured according to blind check can obtain R-PDCCH information.In this way, when not increasing expense, the number of times of blind Detecting can be reduced.
Preferably, the information of the above-mentioned number for the Physical Resource Block shared by bearing downlink control channel reality can be arranged in common control information, wherein, this common control information and dedicated control information do not interweave and are mapped on fixing physical time-frequency resource, or this common control information above-mentioned also can interweave with dedicated control information and be mapped on public search space.
When above-mentioned information be arranged in not interweave with dedicated control information and the common control information be carried on the fixing running time-frequency resource of frame, via node receive base station send carry the signaling of common control information time, first can know common control information from above-mentioned fixing running time-frequency resource, then, the number being actually used in the Physical Resource Block of bearing downlink control channel is extracted from common control information.Then, from the PRB of base station assigns, select the PRB of above-mentioned number to carry out blind Detecting, the CCE information measured by blind check determines whether to obtain R-PDCCH information.In this way, the number of times of blind Detecting can be reduced further.
When above-mentioned information be arranged in interweave with dedicated control information and to be mapped to the common control information on public search space, via node cannot know the position of common control information in frame in advance.Therefore, receive base station send carry the signaling of common control information time, via node first can carry out blind Detecting to the Physical Resource Block by base station assigns, or blind Detecting is carried out to the detection set limited, thus acquisition common control information, then, the number being actually used in the Physical Resource Block of bearing downlink control channel is extracted from common control information.
Preferably, then, described via node finds out and the described to be detected Physical Resource Block corresponding for the number of the Physical Resource Block shared by bearing downlink control channel reality in the mapping table of this locality.
Then, from the PRB of base station assigns, select Physical Resource Block to be detected to carry out blind Detecting, the CCE information measured by blind check determines whether to obtain R-PDCCH information.In this way, when not increasing expense, the number of times of blind Detecting can be reduced further.
The embodiment under above-mentioned different detection mode is described in detail below by design parameter.
Embodiment 1
The scene that the present embodiment adopts is: base station and via node define the set of the number of the PRB being actually used in carrying R-PDCCH in advance.
Suppose that eNB has semi-statically reserved 20 PRB for carrying R-PDCCH, and certain subframe only has 14 PRB actual bearer R-PDCCH, remain 6 PRB and transmit PDSCH/R-PDSCH.Because RN is when carrying out blind Detecting, and do not know specifically there is how many PRB actual bearer R-PDCCH, if therefore conventionally, namely do not limit the detection combination of PRB, just can only adopt traversal, namely the situation of 20 PRB is first detected, it's not true, then detect the situation of 19 PRB ... until 14 PRB detected, correctly R-PDCCH could be demodulated.Like this, blind check total degree is exactly: the number of times of 7 × blind Detecting CCE.If the PRB of actual bearer R-PDCCH only has 2, so blind check number of times is exactly the number of times of 19 × blind Detecting CCE.
According to the method for the present embodiment, such as, if eNB has semi-statically reserved N number of PRB for carrying R-PDCCH, so eNB and RN has consulted mutually, and R-PDCCH can only be
individual PRB carries, and wherein, a and b is positive integer, and b≤a.Such as, can only at N,
individual PRB carries, namely can only be carried on 20,14,10,7,4,2 PRB carry.Therefore, according to the method for the present embodiment, the detection of the PRB of RN combination 6 have been reduced to, first RN detects the situation of 20 PRB, and it's not true, detects 14 PRB, now just can demodulate correct CCE, and then blind Detecting is carried out to CCE, to obtain the R-PDCCH of oneself.At this moment, blind check total degree is: the number of times of 2 × blind Detecting CCE.
Embodiment 2
The scene that the present embodiment adopts is: base station is actually used in the number of the PRB of carrying R-PDCCH by signaled via node.
In the present embodiment, base station uses independently common control information to comprise the described number for the Physical Resource Block of bearing downlink control channel, this independently common control information can refer to the common control information do not interweaved with dedicated control information.
Concrete, above-mentioned common control information is one piece of independently public control area.Mark one piece of relay resource (backhaul resource) specially, such as 1 or multiple PRB are as independently public control area.
Such as, semi-staticly reserved 20 PRB, the number of the PRBs of actual bearer R-PDCCH is 15.Now, public control area needs the number of the PRBs indicating actual bearer R-PDCCH with 5 bits, and the detecting step of RN is as follows:
Step 1:RN receive and demodulation public domain in information, will obtain 01111, the number just representing the PRBs of actual bearer R-PDCCH is 15.
Step 2: in semi-static reserved PRB, receives 15 PRB obtained in the previous step, through demodulation and deinterleaving, obtains a string CCE.
Step 3: a string CCE obtained step 2 carries out the blind Detecting of similar Rel-8, to obtain the R-PDCCH of oneself.
Embodiment 3
The scene that the present embodiment adopts is: base station is actually used in the number of the PRB of carrying R-PDCCH by signaled via node.
In the present embodiment, base station uses public search space (Common Search Space) to carry common control information, and wherein, this common control information comprises the described number 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 number of PRBs of method double static reservations in embodiment 1, to find the PRB at public search space place.Preferably, the number set of the PRB of carrying common control information can be defined in advance, such as, (e.g., the number set of PRB can be defined as a kind of number
individual PRB) or 2 kinds of numbers are (e.g.,
individual PRB,
individual PRB), thus RN receives and demodulates common control information, and obtain the number of the PRB being actually used in carrying R-PDCCH from described common control information, such as
individual.
Step 2: in semi-static reserved PRB, receive obtained in the previous step
individual PRB, through demodulation and deinterleaving, obtains a string CCE.
Step 3: a string CCE obtained step 2 carries out the blind Detecting of similar Rel-8, to obtain the R-PDCCH of oneself.
According to the method for embodiment 3, RN only needs the blind Detecting that will travel through public search space, and the blind Detecting that need not travel through dedicated search space (Specific Search Space).Thus do not having, in extra expense situation, to decrease the number of times of blind Detecting.
According to the embodiment of the present invention, additionally 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 and arranges module 4021 and sending module 4022.And via node 404 comprises receiver module 4041, acquisition module 4042, selects module 4043, determination module 4044 and detection module 4045.
In working order, arrange module 4021 and arrange the information relevant to the number of the Physical Resource Block for bearing downlink control channel, then, sending module 4022 sends the signaling carrying above-mentioned information to via node 404.
At receiving terminal, the receiver module 4041 of via node 404 receives above-mentioned signaling.When above-mentioned signaling carry be the information of the number of the Physical Resource Block of semi-static configuration for bearing downlink control channel, acquisition module 4042 needs the detection set of the Physical Resource Block of the down control channel carrying out blind Detecting according to above-mentioned acquisition of information, wherein, above-mentioned detection set comprises the Physical Resource Block of above-mentioned semi-static configuration at least partially.Then, select module 4043 from above-mentioned detection set, select a kind of number of Physical Resource Block one by one.Then, determination module 4044 according to selected go out the number of Physical Resource Block determine above-mentioned Physical Resource Block to be detected.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 corresponding down control channel, module 4043 is then selected to reselect a kind of number of Physical Resource Block, determination module 4044 and detection module 4045 repeat operation, until detect corresponding down control channel.
Preferably, via node 404 according to selected go out the number of Physical Resource Block determine that above-mentioned Physical Resource Block to be detected comprises: via node find out in the mapping table of this locality with selected go out Physical Resource Block to be detected corresponding to the number of Physical Resource Block.
When above-mentioned signaling carry be information for the number of the Physical Resource Block shared by bearing downlink control channel reality, determination module 4044 directly determines above-mentioned Physical Resource Block to be detected from the information received.Preferably, via node 404 finds out and the above-mentioned to be detected Physical Resource Block corresponding for the number of the Physical Resource Block shared by bearing downlink control channel reality in the mapping table of this locality.
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 information of the described number for the Physical Resource Block shared by bearing downlink control channel reality is arranged in common control information, wherein, described common control information and dedicated control information do not interweave and are mapped on fixing physical time-frequency resource, or, interweave with described dedicated control information and be mapped on public search space.
According to the detection system of the down control channel of the embodiment of the present invention, by signaled via node, it is actually used in the number of the Physical Resource Block of bearing downlink control channel in base station, or, 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, the set of the number of the Physical Resource Block for bearing downlink control channel just can be obtained.Like this, via node is after the set knowing above-mentioned number or above-mentioned number, namely the number of the Physical Resource Block for bearing downlink control channel can be detected by less detection number of times, thus ensure that via node has lower complexity when blind Detecting down control channel, less blind Detecting time delay, improve whole system efficiency, and ensure that the flexibility of the PRB configuration carrying R-PDCCH, backhaul resource is utilized fully.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a detection method for down control channel, is characterized in that, comprising:
Base station sends signaling to via node, wherein, described signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, or carries the information of the number for the Physical Resource Block shared by bearing downlink control channel reality;
Described via node is according to described acquisition of information 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.
2. method according to claim 1, is characterized in that, described signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, wherein,
Described via node comprises according to the Physical Resource Block that described acquisition of information is to be detected:
Described via node needs the detection set of the Physical Resource Block of the down control channel carrying out blind Detecting according to described acquisition of information, wherein, described detection set comprises the Physical Resource Block of described semi-static configuration at least partially;
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:
The number selecting a kind of Physical Resource Block set is detected one by one from described;
According to selected go out the number of Physical Resource Block determine 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, according to selected go out the number of Physical Resource Block determine that described Physical Resource Block to be detected comprises:
Described via node find out in the mapping table of this locality with selected go out Physical Resource Block to be detected corresponding to the number of Physical Resource Block.
4. method according to claim 1, is characterized in that, base station sends signaling to via node and comprises:
Send the signaling carrying common control information, wherein, described common control information comprises the described number for the Physical Resource Block shared by bearing downlink control channel reality and described common control information and dedicated control information do not interweave, and is mapped on fixing physical time-frequency resource.
5. method according to claim 1, is characterized in that, base station sends signaling to via node and comprises:
Send the signaling carrying common control information, wherein, described common control information comprises the described number for the Physical Resource Block shared by bearing downlink control channel reality and described common control information and dedicated control information interweave, and is mapped on public search space.
6. the method according to claim 4 or 5, is characterized in that, described via node comprises according to the Physical Resource Block that described acquisition of information is to be detected:
Blind Detecting is carried out to the Physical Resource Block by described base station assigns, or blind Detecting is carried out to the detection set of the Physical Resource Block of down control channel, obtain described common control information;
The described number for the Physical Resource Block shared by bearing downlink control channel reality is extracted from described common control information;
Described Physical Resource Block to be detected is determined according to the described number for the Physical Resource Block shared by bearing downlink control channel reality.
7. method according to claim 6, is characterized in that, determines that described Physical Resource Block to be detected comprises according to the described number for the Physical Resource Block shared by bearing downlink control channel reality:
Described via node finds out and the described to be detected Physical Resource Block corresponding for the number of the Physical Resource Block shared by bearing downlink control channel reality in the mapping table of this locality.
8. a detection system for 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 carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, or, carry the information of the number for the Physical Resource Block shared by bearing downlink control channel reality;
Described via node is used for according to described acquisition of information Physical Resource Block to be detected and carries out blind Detecting according to described Physical Resource Block to be detected to the Physical Resource Block by described base station assigns.
9. system according to claim 8, is characterized in that, described signaling carries the information of the number of the Physical Resource Block of the semi-static configuration for bearing downlink control channel, and described via node comprises:
Acquisition module, for needing the detection set of the Physical Resource Block of the down control channel carrying out blind Detecting according to described acquisition of information, wherein, described detection set comprises the Physical Resource Block of described semi-static configuration at least partially;
Select module, for detecting from described the number selecting a kind of Physical Resource Block set one by one;
Determination module, the number for the Physical Resource Block gone out selected by basis determines described Physical Resource Block to be detected;
Detection module, for carrying out blind Detecting according to described Physical Resource Block to be detected to the Physical Resource Block by described base station assigns.
10. system according to claim 8, it is characterized in that, the information of the described number for the Physical Resource Block shared by bearing downlink control channel reality is arranged in common control information, wherein, described common control information and dedicated control information do not interweave and are mapped on fixing physical time-frequency resource, or, interweave with described dedicated control information and be mapped on public 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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| CN103200687B (en) * | 2012-01-09 | 2016-09-14 | 华为技术有限公司 | A kind of control channel resource mapping method, base station and subscriber equipment |
| WO2013117014A1 (en) * | 2012-02-10 | 2013-08-15 | Nokia Siemens Networks Oy | Identifying a subset of a plurality of radio resources of a downlink control channel |
| WO2013139011A1 (en) * | 2012-03-21 | 2013-09-26 | 富士通株式会社 | Method and device for mapping search space of downlink control channel |
| CN103427948B (en) * | 2012-04-19 | 2018-07-31 | 马维尔国际有限公司 | Method and apparatus for decoding physical downlink control channel |
| WO2014019144A1 (en) * | 2012-07-31 | 2014-02-06 | 华为技术有限公司 | Transmission method for control channel, base station, and terminal |
| RU2602808C1 (en) * | 2012-09-26 | 2016-11-20 | Хуавей Текнолоджиз Ко., Лтд. | Method of detecting control channel and user device |
| WO2014110815A1 (en) | 2013-01-18 | 2014-07-24 | 华为技术有限公司 | Detection method, transmission method and apparatus for common control channel |
| CN105577317A (en) * | 2014-10-15 | 2016-05-11 | 中兴通讯股份有限公司 | Detection method and apparatus for DCI |
| CN108432198B (en) * | 2016-01-11 | 2021-07-23 | 苹果公司 | Apparatus and method for IoT control channel |
| CN108365928B (en) * | 2017-01-26 | 2023-04-07 | 北京三星通信技术研究有限公司 | Configuration information sending method, control channel resource detection method and device |
| US11582727B2 (en) | 2017-08-09 | 2023-02-14 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and apparatus for transmitting control information |
| WO2019056390A1 (en) * | 2017-09-25 | 2019-03-28 | Oppo广东移动通信有限公司 | Wireless communication method, network device, and terminal |
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| CN102215507A (en) | 2011-10-12 |
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