CN104144502A - Physical downlink control information acquisition method, device, terminal and system - Google Patents
Physical downlink control information acquisition method, device, terminal and system Download PDFInfo
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Abstract
The invention discloses a physical downlink control information acquisition method, device, terminal and system and relates to the technical field of LTE. The method includes the steps that when UE detects exclusive control information of users of the UE after detecting public control information, E-PDCCH addressing set indication information is detected in a PDCCH area, and E-PDCCH search space is found according to the detected addressing information for blind detection on the exclusive control information of the users of the UE. According to the method, E-PDCCH addressing indication is carried out by combination of a dynamic signaling configuration mode and a high-level semi-static signaling configuration mode, the UE is deeply utilized for feeding back channel state estimation information, the users within the similar area are grouped, expenses of information indication are reduced, and capacity of a PDCCH is improved. Under the situation that control channel resources are not sufficient but traffic channel resources are sufficient, more control channel resources can be provided flexibly.
Description
Technical field
The present invention relates to LTE(Long Term Evolution, Long Term Evolution) technical field, particularly a kind of physical down control information acquisition methods, terminal and system.
Background technology
3GPP LTE system is 3G(3rd Generation, 3-G (Generation Three mobile communication system)) Long Term Evolution version.At present its standard formulation situation is Release(version) 8(Rel.8) version and on Rel.8 basis slightly vicissitudinous Rel.9 version relatively ripe.And follow-up LTE Rel.10 version is larger because of its relative Rel.8 and the change of Rel.9 version, 3GPP claims that this version and later release are LTE-A(LTE-Advanced) system, the enhancing version of LTE, has proposed more competitive system performance index.Rel.10 release criteria is freezed at present, and the research of Rel.11 release criteria and definition work start, just under discussion.
LTE and LTE-A system descending adopt OFDMA(Orthogonal Frequency Division Multiple Access, OFDM) technology, at up direction, adopt the lower SC-FDMA(Single Carrier-Frequency Division Multiple Access of peak-to-average force ratio, single-carrier frequency division multiple access) technology.In addition the multi-antenna technology adopting in system, (MIMO:Multiple Input Multiple Output) provides spatial reuse gain and emission diversity gain.Therefore, LTE and LTE-A system available resources comprise the dimensions such as time domain, frequency domain and spatial domain, base station is by scheduling and resource allocation algorithm, channel information based on user in community is reasonably time slot, the PRB(Physical Resource Block that user assignment is suitable flexibly, Physical Resource Block), MCS(Modulation and Coding Scheme, modulating-coding form), transmitting power, MIMO transmission plan etc., to improve throughput of system, meet the rate requirement of Cell Edge User simultaneously.
In LTE and LTE-A system, the control signal information of down channel is with various types of DCI(Downlink Control Information, Downlink Control Information) transmit, these DCI are by PDCCH(Physical Downlink Control Channel, Physical Downlink Control Channel) middle carrying.DCI information is very crucial to the communication of down link, only have and correctly parse DCI information, could further go the transmission of demodulating and decoding downlink data information, so can terminal correctly receive DCI information and determined that can downlink data link communicate by letter accurately.
In the 10ms frame structure of LTE and LTE-A system definition, the corresponding TTI(Transmission Time Interval of 1ms descending sub frame, Transmission Time Interval).In a TTI, in PDCCH time domain, take front n(0<n<=3, n is integer) individual OFDM(Orthogonal Frequency Division Multiplexing, OFDM) symbol, on frequency domain, take whole system bandwidth.Other channel comprises as reference signal, PCFICH(Physical Control Format Indicator Channel, Physical Control Format Indicator Channel), PHICH(Physical HARQ Indicator Channel, Physical HARQ Indicator Channel) etc.Therefore in each descending sub frame, only have the reserved running time-frequency resource of limited quantity to can be used for Downlink Control Information transmission, the PDCCH that carries DCI information can be very limited with running time-frequency resource.
The least unit that PDCCH resource is distributed is CCE(Control Channel Element, control channel element), 1 CCE comprises 9 REG(Resource Element Group, resource element group), and a REG comprises 4 RE(Resource Element, resource element), therefore a CCE has comprised 36 RE.LTE and LTE-A standard regulation allow CCE to have four kinds of AL(Aggregation Level, polymerization grade), AL=1,2,4 and 8, a corresponding PDCCH channel takies 1,2,4 or 8 CCE simultaneously respectively.
Different according to the DCI type of transmission, PDCCH comprises two class search volumes, CSS(Common Search Space, public search space) and USS(UE-specific Search Space, user-specific search volume).CSS fixes position, and the public part descending control signaling of all users in transmission community, as paging information, system information and accidental access response information etc.; And USS is for transmitting the information relevant to specific user, as above, downlink resource distributes, the signalings such as power control.In downlink transfer, each UE, after receiving each subframe, can adopt the method for blind Detecting to detect common control information and the peculiar control information of user at CSS and USS space.
PDCCH is the physical control information of LTE and LTE-A system descending transfer of data, and the correct reception of UE to downlink data, greatly depends on the correct detection to PDCCH.Therefore, the accurate transmission of PDCCH is most important to the normal operation of system with reception.As previously mentioned, the running time-frequency resource that can be used to transmit PDCCH in a subframe is limited, only can in front 3 OFDM symbols of full bandwidth, transmit at most, in these only resources, also to remove other as transmission PCFICH, the part resource that PHICH and reference signal are shared, so the resource that PDCCH can transmit is more limited.
On the other hand, for guaranteeing coverage and the cell edge transmission rate of LTE and LTE-A system, this just requires more reliable PDCCH transmission.If domestic telecommunication operator builds LTE and LTE-A system at present, its available radio spectrum is surplus 2.1GHz only, the contour frequency spectrum of 2.6GHz, and its signal attenuation is rapid.And for the consideration of Cost Problems, operator's majority all can be selected to utilize and build LTE/LTE-A network in the resource of existing site, this just requires more accurate more effective control information transmission.In the situation that channel quality is poor, the transmission of community UE especially its PDCCH of cell edge UE is also needed to more resource in addition.Therefore, PDCCH resource is of great rarity, and needs enhancing badly.
In order to address this problem, in 3GPP LTE R11 standard formulation work, proposed PDCCH to strengthen.The common recognition that 3GPP reaches is at present, in R11 standard, keep existing physical layer frame structure constant, when retaining the traditional PD CCH territory assurance backward compatibility of R8-R10 version, part resource in PDSCH territory is used for transmitting PDCCH information, its advantage is the available resources that increased downlink control signaling, can utilize the technology such as wave beam forming to strengthen the interference free performance of signal simultaneously, improves the coverage of control signal transmission.The method is named as E-PDCCH(Enhanced PDCCH, enhancement mode Physical Downlink Control Channel), i.e. enhancement mode down control channel.
In E-PDCCH, need to solve a major issue, concerning R11UE, its corresponding control signal of addressing in PDSCH territory how.In R8-R10 version in traditional PD CCH territory, UE is by a relevant CCE polymerization grade, a hash function of subframe numbering and cell identity identification number (C-RNTI), can be addressed to the original position of its corresponding descending control signaling, starts to carry out blind Detecting.In the time of control channel in PDSCH territory, this mode is impossible, therefore must traditional control signal addressing system be made a change, to adapt to the situation of control channel in PDSCH territory.If indicate the control signal of which UE to transmit, just must increase corresponding indication signaling in which PDSCH resource.The mode that this indication signaling increases has two kinds of selections, and a kind of is by the semi-static corresponding resource of scheduling of high-level signaling (as RRC signaling); Another kind is by the corresponding indication signaling of dynamic increase in each subframe.
The method of semi-static configuration, by high-rise configuration signal, by PDSCH certain fixedly time-frequency resource allocating give this UE, and dispatch without the resource that takies again PDCCH.The method has been saved the expense of PDCCH resource, for dispatch more UE simultaneously, provides possibility.But the high-level signaling update cycle is longer, mean that this piece resource will distribute to this UE always until the renewal of high-level signaling next time if be assigned as PDSCH resource of certain UE for transmitting downlink control signal.This inflexible source scheduling mode has the risk of certain wasting of resources, particularly as UE, only needs the situation of less control signal.When another shortcoming is exactly high-level signaling config update, can produce the fuzzy subframe of signaling, namely UE is also coarse knows that this upgrades high-level signaling in that subframe, can affect the dispatching effect of control signal.Therefore, the method for high-rise semi-static configuration cannot realize running time-frequency resource and carry out dynamic dispatching according to business demand, can reduce the dispatching efficiency of running time-frequency resource.
By the signaling of carrying in each subframe, dynamically transfer PDSCH resource, just need to all will be for UE configures corresponding indexed resource, to notify its control signal of UE present position in PDSCH resource in every subframe.Because this indexed resource still will occupy the part resource in traditional PD CCH territory, therefore require this indication information only need comprise necessary information, but even so, this indication information also at least will comprise resource location indication, the information such as the shared size indication of resource and modulation coding mode, these information are about half of the contained information of common DCI, and therefore shared resource overhead can not be too little.The design object of E-PDCCH is exactly to expand the resource that control signal can transmit, the capacity problem that may face to solve control channel.Although this dynamic resource indicating mode is put into control channel signaling in PDSCH territory and transmits, but it is also very large owing to dynamically indicating spent resource, when therefore in community, movable UE number is more, which still cannot solve the capacity problem that control channel faces, and can cause because having taken too much PDSCH resource transmission control information on the contrary data traffic channels to produce the limited problem of capacity.
Summary of the invention
The present inventor finds to have problems in above-mentioned prior art, and therefore at least one problem in described problem, has proposed a kind of new technical scheme.
An object of the present invention is to provide a kind of technical scheme of obtaining for physical down control information.
According to a first aspect of the invention, provide a kind of physical down control information acquisition methods, having comprised:
Terminal obtains grouping information by high-level signaling, and grouping information comprises the transmission group sign at terminal place;
According to transmission group, be identified at the E-PDCCH addressing group indication information of the PDCCH region detected transmission group of subframe;
According to E-PDCCH addressing group indication information, determine the address, E-PDCCH search volume of terminal;
According to the proprietary Downlink Control Information of user of address, E-PDCCH search volume sense terminals in the E-PDCCH of subframe.
Alternatively, the method also comprises:
ENB(evolved Node B, evolved base station) according to the distance in the similarity of channel feedback information, wireless propagation environment and geographical position, terminal is divided into different transmission groups;
ENB sends to terminal by high-level signaling by grouping information.
Alternatively, the method also comprises: terminal detects the common control information of down channel at the PDCCH of subframe public search space.
Alternatively, grouping information also comprises: terminal number in transmission group, terminal is sequence number in transmission group.
Alternatively, the E-PDCCH addressing group indication information that is identified at the PDCCH region detected transmission group of subframe according to transmission group comprises:
The E-PDCCH addressing group indication information that transmission group sign is determined to transmission group as the input of group's indication information hash function is at the PDCCH of subframe regional location;
According to the E-PDCCH addressing indication information of position probing transmission group.
Whether alternatively, E-PDCCH addressing group indication information comprises indicating bit, to indicate the proprietary Downlink Control Information of user of each terminal in transmission group to transmit in subframe.
Alternatively, the method also comprises:
ENB is by the semi-static configuration of high-level signaling, switch E-PDCCH addressing group indication information;
When closing E-PDCCH addressing group indication information, eNB is by the E-PDCCH search volume of high-level signaling indicating terminal;
When opening E-PDCCH addressing group indication information, eNB indicates the E-PDCCH search volume of group's terminal dynamically by E-PDCCH addressing group indication information.
Alternatively, the method also comprises: downlink resource retains original PDCCH region, and the common control information of all terminals is still distributed in the public search space of PDCCH; User's private downlink control information of early version terminal is distributed in the transmission of PDCCH region; User's private downlink control information of redaction terminal is distributed in the transmission of E-PDCCH region.
According to a further aspect in the invention, provide a kind of Downlink Control Information acquisition device, comprising:
Transmission group identifier acquisition module, for obtaining grouping information by high-level signaling, grouping information comprises the transmission group sign at terminal place;
Group's indication information detection module, for being identified at the E-PDCCH addressing group indication information of the PDCCH region detected transmission group of subframe according to transmission group;
Address, search volume determination module, for determining the address, E-PDCCH search volume of terminal according to E-PDCCH addressing group indication information;
Proprietary control information detection module, for the proprietary Downlink Control Information of user in the E-PDCCH of subframe sense terminals according to address, E-PDCCH search volume.
Alternatively, this device also comprises: common control information detection module, detects the common control information of down channel for the PDCCH public search space in subframe.
Whether alternatively, E-PDCCH addressing group indication information comprises indicating bit, to indicate the proprietary Downlink Control Information of user of each terminal in transmission group to transmit in subframe.
Alternatively, grouping information also comprises: terminal number in transmission group, terminal is sequence number in transmission group.
According to another aspect of the invention, provide a kind of terminal, comprise above-mentioned Downlink Control Information acquisition device.
In accordance with a further aspect of the present invention, provide a kind of Downlink Control Information to obtain system, comprise terminal described above, and eNB; ENB is divided into different transmission groups according to the distance in the similarity of channel feedback information, wireless propagation environment and geographical position by terminal; By high-level signaling, grouping information is sent to terminal.
An advantage of the present invention is, indicates the address, E-PDCCH search volume of a plurality of terminals by group's indication information, thereby has reduced the taking of PDCCH resource, and has improved the efficiency of the utilization of resources.
By the detailed description to exemplary embodiment of the present invention referring to accompanying drawing, it is clear that further feature of the present invention and advantage thereof will become.
Accompanying drawing explanation
The accompanying drawing that forms a part for specification has been described embodiments of the invention, and together with the description for explaining principle of the present invention.
With reference to accompanying drawing, according to detailed description below, can more be expressly understood the present invention, wherein:
Figure 1A illustrates traditional downlink resource and distributes schematic diagram.
The downlink resource that Figure 1B illustrates with E-PDCCH distributes schematic diagram.
Fig. 1 C illustrates dynamic indicating downlink resource distribution signal.
Fig. 2 illustrates according to the flow chart of an embodiment of physical down control information acquisition methods of the present invention.
Fig. 3 illustrates according to the flow chart of another embodiment of physical down control information acquisition methods of the present invention.
Fig. 4 illustrates according to the flow chart of another embodiment of physical down control information acquisition methods of the present invention.
Fig. 5 illustrates according to the flow chart of an embodiment of compatible old version terminal in physical down control information acquisition methods of the present invention.
Fig. 6 illustrates the semi-static configurating downlink resource distribution of the dynamic bind schematic diagram of an example according to the present invention.
Fig. 7 illustrates according to the structure chart of an embodiment of physical down control information acquisition device of the present invention.
Fig. 8 illustrates according to the structure chart of another embodiment of physical down control information acquisition device of the present invention.
Embodiment
Now with reference to accompanying drawing, describe various exemplary embodiment of the present invention in detail.It should be noted that: unless illustrate in addition, the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step do not limit the scope of the invention.
, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not to draw according to actual proportionate relationship meanwhile.
To the description only actually of at least one exemplary embodiment, be illustrative below, never as any restriction to the present invention and application or use.
For the known technology of person of ordinary skill in the relevant, method and apparatus, may not discuss in detail, but in suitable situation, described technology, method and apparatus should be regarded as authorizing a part for specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: in similar label and letter accompanying drawing below, represent similar terms, therefore, once be defined in an a certain Xiang Yi accompanying drawing, in accompanying drawing subsequently, do not need it to be further discussed.
Fig. 2 illustrates according to the flow chart of an embodiment of physical down control information acquisition methods of the present invention.
As shown in Figure 2, step 202, terminal obtains grouping information by high-level signaling, and grouping information comprises the transmission group sign at terminal place.
Step 204, terminal is identified at the E-PDCCH addressing group indication information of the PDCCH region detected transmission group of subframe according to transmission group.
The Downlink Control Information that belongs to the UE of same transmission group is multiplexed in same E-PDCCH resource and is transmitted, and in PDCCH region, transmit the addressing information of this E-PDCCH, comprise resource location assignment information, resource is distributed type information etc.The PDCCH addressing of group's indication information of corresponding different transmission groups can adopt the mode of similar traditional PD CCH Downlink Control Information addressing.
Step 206, terminal is determined the address, E-PDCCH search volume of terminal according to E-PDCCH addressing group indication information;
Step 208, terminal is according to address, E-PDCCH search volume proprietary Downlink Control Information of the user of sense terminals in E-PDCCH.After eNB divides into groups to UE, UE belongs to certain transmission group.But concerning some particular UE, be not that each subframe has UE proprietary control information, therefore, indication information can notify UE its whether be necessary to continue to detect E-PDCCH.Certain UE in same transmission group whether in certain specific sub-frame transmission meeting in E-PDCCH addressing group indication information for example the information by one 4 or 5bit indicate.4bit can hold no more than 16 users, and 5bit can hold no more than 32 users.Concrete 4bit or 5bit are by high-rise RRC signal deployment.
In above-described embodiment, by group's indication information, indicate the address, E-PDCCH search volume of a plurality of terminals, down control channel is strengthened, improve control channel capacity, thereby reduced the taking of PDCCH resource, avoided resource excess waste, improved the efficiency of the utilization of resources.
In one embodiment, in same transmission group, all UE are to common E-PDCCH addressing information, by the hash function identical with traditional PD CCH information addressing system, indicate, a sign similar with UE information for transmission group group information, so that as the input of hash function.Wherein, for resource location assignment information, can adopt the way of quantification.In each subframe, the transmission group number of community can fixedly not be taken as 23 or 24 more than N(N) individual.This method of salary distribution is divided into N region by descending PDSCH resource according to frequency, and each region can have at the most from original position on frequency domain
e-PDCCH can be carried in individual subcarrier region.Therefore,, in the addressing information of E-PDCCH, the required bit number of E-PDCCH downlink resource assignment information of its distribution is:
Former downlink resource distributes required bit number to be
and utilize aforesaid way, downlink resource to distribute required bit number to be
Fig. 3 illustrates according to the flow chart of another embodiment of Downlink Control Information acquisition methods of the present invention.
As shown in Figure 3, step 302, eNB divides into groups to terminal, and grouping information is periodically sent to each terminal by high-level signaling (as RRC signaling).Grouping information comprises terminal number, the sequence number of terminal in transmission group etc. in the transmission group sign, transmission group at terminal place.For example, eNB divides transmission group to Mobile Forms redaction UE.According to the channel condition information of Mobile Forms UE feedback, eNB side is similar by the direction of propagation, and the UE of dissemination channel situation similar (geographical position is approximate) is subdivided into a transmission group.Grouping situation periodically updates by high-rise RRC signaling, and by UE place group notice UE.
Step 304, terminal obtains grouping information by high-level signaling.
Step 306, terminal detects the common control information to down channel at the public search space of the PDCCH of subframe.When in LTE-A system, eNB sends downlink data, public search space is still reused the public search space distributing in PDCCH territory.
Step 308, terminal is identified at the E-PDCCH addressing group indication information of the PDCCH region detected transmission group of subframe according to transmission group.
Step 310, terminal is determined the address, E-PDCCH search volume of terminal according to E-PDCCH addressing group indication information;
Step 312, terminal is according to address, E-PDCCH search volume proprietary Downlink Control Information of the user of sense terminals in E-PDCCH.
In one embodiment, eNB is by the semi-static configuration of high-level signaling (as RRC signaling), the above-mentioned dynamic group indication information of switch.When closing group's indication information, eNB indicates the E-PDCCH search volume of UE by high-level signaling.When opening group's indication information, eNB indicates its E-PDCCH search volume of the UE of group dynamically by group's indication information.
In LTE-A system, when distributing UE proprietary control information, eNB opens up the proprietary control information that E-PDCCH resource is placed redaction UE in PDSCH resource.According to the channel estimating of redaction UE, UE is divided into some transmission groups.The control information of UE in a transmission group is placed on same region and makes each UE can obtain therein its corresponding control information with certain resource mapping method.ENB is placed on the addressing indication information in this transmission group E-PDCCH space in the respective resources in PDCCH region according to rule according to transmission group information.ENB can select whether open this group's indication information function according to channel estimation case, if close, the address, E-PDCCH search volume of redaction UE is by high-level signaling (as RRC signaling) indication.
Fig. 4 illustrates according to the flow chart of another embodiment of Downlink Control Information acquisition methods of the present invention.
As shown in Figure 4, step 402, new edition UE receives descending single sub-frame data.
Step 404, new edition UE detects PCFICH symbolic number, and symbolic number can be 1,2 or 3.
Step 406, redaction UE detects the common control information of PDCCH public search space.
Step 408, redaction UE judges according to high-level signaling whether group's capable of indicating on-off state is opened, if open, continue step 410, otherwise UE is known its E-PDCCH search volume address information by high-level signaling, continues step 412.
Step 410, the transmission group at group's indication information place finds the addressing group indication information of E-PDCCH; Addressing information is detected, obtain the UE sequence number of having distributed proprietary control information in E-PDCCH in this group in the interior E-PDCCH address information of this group and current subframe.If this UE judges the transmission that there is no its Downlink Control Information in this subframe, no longer detect, wait for the beginning of next subframe.
Step 412, if judging the E-PDCCH region in this subframe, this UE has the transmission of its Downlink Control Information, after receiving the total data of this subframe, UE utilizes E-PDCCH address information in the group having detected find the address of its E-PDCCH search volume and its Downlink Control Information is carried out to blind Detecting, obtains its user's private downlink control information.
Step 414, judgement has or not PDSCH transfer of data, if nothing continues step 402, otherwise, continue step 416.
Step 416, according to DCI demodulates information PDSCH information.
Step 418, does judgement have or not UE transmission group information updating? if had, continue step 420, otherwise, continue step 402.
Step 420, upgrades current high-rise RRC signaling ZhongUE district's transmission group information, continues step 408.
In one embodiment, the Downlink Control Information of redaction UE and early version UE is placed on respectively two regions.
Downlink resource still retains original PDCCH region, and the Downlink Control Information of early version UE is still being distributed in this region transmission, thereby meets backwards compatibility.The Downlink Control Information of redaction UE is distributed in the transmission of E-PDCCH region.E-PDCCH takies a part for original PDSCH region resource.The common control information of all UE is still distributed in the public search space of PDCCH.
For early version UE, when UE side detects Downlink Control Information, early version UE detects rule without change, and eNB is according to the user proprietary control information of revision scheme placement in early stage early version UE.
Fig. 5 illustrates according to the flow chart of an embodiment of compatible old version terminal in Downlink Control Information acquisition methods of the present invention.
As shown in Figure 5, step 502, early version UE receives descending single sub-frame data.
Step 504, early version UE detects PCFICH symbolic number, and symbolic number can be 1,2 or 3.
Step 506, early version UE detects the common control information of PDCCH public search space according to symbolic number indication.
Step 508, does judgement have or not the proprietary search volume of UE PDCCH information? if had, continue step 510, otherwise, continue step 512.
Step 510, carries out the proprietary search volume PDCCH of UE according to symbolic number indication and detects.
Step 512, does judgement have or not PDSCH transfer of data? if had, continue step 514, otherwise, continue step 502.
Step 514, according to DCI demodulates information PDSCH information.
In one embodiment, when the user proprietary control information of early version UE and the addressing group indication information of E-PDCCH conflict, abandon the former.Need to this information because group's indication information has the UE of a group, therefore there is higher priority more reasonable.
Fig. 6 illustrates the semi-static configurating downlink resource distribution of the dynamic bind schematic diagram of an example according to the present invention.As shown in Figure 6, terminal 1,2,3 shares the addressing indication information of E-PDCCH, and terminal 4,5,6 shares the addressing indication information of E-PDCCH.Compared to the prior art, reduced the spent PDCCH resource of dynamic indication.
Fig. 7 illustrates according to the structure chart of Downlink Control Information acquisition device of the present invention embodiment.As shown in Figure 7, this device comprises: transmission group identifier acquisition module 71, and for obtaining grouping information by high-level signaling, grouping information comprises the transmission group sign at terminal place; Group's indication information detection module 72, for being identified at the E-PDCCH addressing group indication information of the PDCCH region detected transmission group of subframe according to transmission group; Address, search volume determination module 73, for determining the address, E-PDCCH search volume of terminal according to E-PDCCH addressing group indication information; Proprietary control information detection module 74, for the proprietary Downlink Control Information of user in the E-PDCCH of subframe sense terminals according to address, E-PDCCH search volume.Grouping information also comprises terminal number in transmission group, and terminal is sequence number in transmission group.
Whether in one embodiment, E-PDCCH addressing group indication information comprises indicating bit, to indicate the proprietary Downlink Control Information of user of each terminal in transmission group to transmit in subframe.
Fig. 8 illustrates according to the structure chart of another embodiment of Downlink Control Information acquisition device of the present invention.As shown in Figure 8, this device comprises transmission group identifier acquisition module 71, common control information detection module 85, group's indication information detection module 72, address, search volume determination module 73 and proprietary control information detection module 74.Wherein, common control information detection module 85, detects the common control information of down channel for the PDCCH public search space in subframe.
Relative prior art, the disclosure makes interior its down link of a subframe of LTE-A system that more control channel resource can be provided neatly, and each embodiment has following some or all of advantage and effect:
At control channel inadequate resource but traffic channel resource abundance in the situation that, the application can provide more control channel resource neatly.The method is expanded existing down control channel resources, offers control channel use with relatively sufficient downlink sharied signal channel resource, has increased the resource of down control channel in a kind of mode flexibly, has improved the capacity of system.
The mode that the disclosure also provides a kind of dynamic signaling configuration to combine with high-rise semi-static signal deployment, carries out the expansion indication of control channel.Avoided signaling update cycle that the semi-static signal deployment of simple high level brings fuzzy problem of signaling during long and signaling update, the indication signaling expense of also having avoided simple dynamic-configuration to bring is excessive, and capacity promotes the problem of DeGrain.Which combines high-rise semi-static signal deployment saving addressing indexed resource and dynamic signaling configures the advantage that every TTI upgrades, and promotes control channel capacity successful.
The disclosure method also deep exploitation UE feed back to channel status estimated information, a plurality of users at similar area are organized into groups, utilize the similar feature of its channel conditions, their Downlink Control Information is placed in a common E-PDCCH region, utilize the methods such as wave beam forming to propagate, when can improve the overlay area of control channel, save the expense of information indication, improved the capacity of control channel.
Spreadability problem about group's indication information, because group's indication information bit number of design is less, simultaneously when using larger CCE polymerization grade, it has low-down code check, there is good coverage property, its coverage distance can surpass the coverage distance of E-PDCCH, therefore covers the bottleneck of Bu Shi group indication information.
The disclosure is configurable in system running.When wireless propagation environment changes, system Ke Duigai group indication information function is carried out switch, to adapt to wireless environment, has increased the reliability of system.
Take into account earlier version UE simultaneously, it is had to backwards compatibility, change systematic cost is lower.
So far, described in detail according to physical down control information acquisition methods of the present invention, device, terminal and system.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.
May realize in many ways method and system of the present invention.For example, can realize method and system of the present invention by any combination of software, hardware, firmware or software, hardware, firmware.The said sequence that is used for the step of method is only in order to describe, and the step of method of the present invention is not limited to above specifically described order, unless otherwise specified.In addition, in certain embodiments, can be also the program being recorded in recording medium by the invention process, these programs comprise for realizing the machine readable instructions of the method according to this invention.Thereby the present invention also covers storage for carrying out the recording medium of the program of the method according to this invention.
Although specific embodiments more of the present invention are had been described in detail by example, it should be appreciated by those skilled in the art, above example is only in order to describe, rather than in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (14)
1. a Downlink Control Information acquisition methods, is characterized in that, comprising:
Terminal obtains grouping information by high-level signaling, and described grouping information comprises the transmission group sign at described terminal place;
The enhancement mode Physical Downlink Control Channel E-PDCCH addressing group indication information of described transmission group is detected in the physical downlink control channel PDCCH region that is identified at subframe according to described transmission group;
According to described E-PDCCH addressing group indication information, determine the address, E-PDCCH search volume of described terminal;
According to address, described E-PDCCH search volume, in the E-PDCCH of described subframe, detect the proprietary Downlink Control Information of user of described terminal.
2. method according to claim 1, is characterized in that, also comprises:
Evolved base station eNB is divided into different transmission groups according to the distance in the similarity of channel feedback information, wireless propagation environment and geographical position by terminal;
Described eNB sends to described terminal by high-level signaling by described grouping information.
3. method according to claim 1, is characterized in that, also comprises:
Described terminal detects the common control information of down channel at the PDCCH of described subframe public search space.
4. method according to claim 1, is characterized in that, described grouping information also comprises: terminal number in transmission group, described terminal is sequence number in transmission group.
5. method according to claim 1, is characterized in that, the E-PDCCH addressing group indication information that described transmission group is detected in the PDCCH region that is identified at subframe according to described transmission group comprises:
The E-PDCCH addressing group indication information that described transmission group sign is determined to described transmission group as the input of group's indication information hash function is at the PDCCH of described subframe regional location;
According to the E-PDCCH addressing indication information of transmission group described in described position probing.
6. method according to claim 1, is characterized in that, whether described E-PDCCH addressing group indication information comprises indicating bit, to indicate the proprietary Downlink Control Information of user of each terminal in described transmission group to transmit in described subframe.
7. method according to claim 1, is characterized in that, also comprises:
Described eNB is by the semi-static configuration of high-level signaling, E-PDCCH addressing group indication information described in switch;
When closing described E-PDCCH addressing group indication information, described eNB is by the E-PDCCH search volume of high-level signaling indicating terminal;
When opening described E-PDCCH addressing group indication information, described eNB indicates the E-PDCCH search volume of group's terminal dynamically by described E-PDCCH addressing group indication information.
8. method according to claim 1, is characterized in that, also comprises:
Downlink resource retains original PDCCH region, and the common control information of all terminals is still distributed in the public search space of PDCCH;
User's private downlink control information of early version terminal is distributed in the transmission of PDCCH region; User's private downlink control information of redaction terminal is distributed in the transmission of E-PDCCH region.
9. a Downlink Control Information acquisition device, is characterized in that, comprising:
Transmission group identifier acquisition module, for obtaining grouping information by high-level signaling, described grouping information comprises the transmission group sign at described terminal place;
Group's indication information detection module, detects the enhancement mode Physical Downlink Control Channel E-PDCCH addressing group indication information of described transmission group for be identified at the physical downlink control channel PDCCH region of subframe according to described transmission group;
Address, search volume determination module, for determining the address, E-PDCCH search volume of described terminal according to described E-PDCCH addressing group indication information;
Proprietary control information detection module, for detecting the proprietary Downlink Control Information of user of described terminal at the E-PDCCH of described subframe according to address, described E-PDCCH search volume.
10. device according to claim 9, is characterized in that, also comprises:
Common control information detection module, detects the common control information of down channel for the PDCCH public search space in described subframe.
11. devices according to claim 9, is characterized in that, whether described E-PDCCH addressing group indication information comprises indicating bit, to indicate the proprietary Downlink Control Information of user of each terminal in described transmission group to transmit in described subframe.
12. devices according to claim 9, is characterized in that, described grouping information also comprises: terminal number in transmission group, described terminal is sequence number in transmission group.
13. 1 kinds of terminals, comprise the Downlink Control Information acquisition device described in any one in claim 9 to 12.
14. 1 kinds of Downlink Control Information obtain system, it is characterized in that, comprise terminal as claimed in claim 14, and evolved base station eNB;
Described eNB is divided into different transmission groups according to the distance in the similarity of channel feedback information, wireless propagation environment and geographical position by terminal; By high-level signaling, described grouping information is sent to described terminal.
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