CN102395205B - Method and system for increasing quantity of physical layer control channel resource - Google Patents
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Abstract
The invention discloses a method and a system for increasing the quantity of a physical layer control channel resource. The method comprises the following steps: 1) a Z-RNTI distributes a vUE to a RNTI, an eUE is provided with the Z-RNTI; 2) a base station dispatches the idle resource of a subframe to an expansion control area, and maps a PDCCH (Physical Downlink Control Channel) of the eUE to the expansion control area; 3) the base station maps the PDCCHs of a tUE and a vUE to the control area of the subframe; 4) the base station uses the Z-RNTI to transmit the PDCCH data of the vUE including resource allocation information, and uses a C-RNTI to transmit the PDCCH of the eUE; and 5) the eUE decodes the PDCCH data of the vUE according to the Z-RNTI, and detects the PDCCH in a search space of the expansion control area. The invention can increase the resource distributed to the physical layer control channel, and reduces the probability of resource conflicts.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of method and system of increasing quantity of physical layer control channel resource.
Background technology
LTE (Long Term Evolution, Long Term Evolution) project is the evolution of 3G, and it improves and enhances the aerial access technology of 3G.Adopt OFDM (OFDM, Orthogonal Frequency Division Multiplexing) and MIMO (multiple-input and multiple-output, Multiple-Input Multiple-Out-put) as the sole criterion of its wireless network evolution.The peak rate of descending 100Mbit/s and up 50Mbit/s can be provided under 20MHz spectral bandwidth.Improve the performance of Cell Edge User, improve cell capacity, and reduce system delay.LTE system of the present invention contains its follow-up evolution version as LTE-A.
The OFDM that LTE have employed in the downstream direction is a kind of data transfer mode efficiently, its basic thought is, in frequency domain, given channel is divided into multiple orthogonal sub-channels, a subcarrier is used to modulate on each of the sub-channels, and each subcarrier parallel transmission.Like this, although total channel be non-flat forms, there is frequency selectivity, but every sub-channels relatively flat, frequency band is narrow, and what carry out on each of the sub-channels is narrow band transmission, signal bandwidth is less than the respective bandwidth of channel, therefore just can interference greatly between erasure signal waveform.OFDM is that it allows subcarrier spectrum to partly overlap relative to the difference of general multi-carrier transmission, as long as meet between subcarrier mutually orthogonal, then can isolate data-signal from the subcarrier of aliasing.Because OFDM allows subcarrier spectrum aliasing, its spectrum efficiency improves greatly, because of but a kind of efficient modulation system.
Describe a kind of frame structure of LTE in FIG, 1 radio frames comprises 10 subframes (subframe), 20 time slots (slot), each descending time slot is divided into again several OFDM symbol, different according to the length of CP (Cyclic Prefix), the quantity of the OFDM symbol comprised is also different.When using conventional CP, a descending time slot comprises 7 OFDM symbol; When using expansion CP, a descending time slot comprises 6 OFDM symbol.In this time/frequency source block, a RE (resource element, Resource Unit) be the resource that a symbol and a subcarriers define, a RB (resource bock, Resource Block) is 12 subcarriers and the running time-frequency resource shared by a descending time slot.The frame structure of LTE has different changes with the Resource Block definition comprised according to different scenes and configuration, and method described in the invention is all applicable in other possible structural allocation various, is not limited to the description of Fig. 1.
LTE system can map different physical channel usually in each subframe in the resource of correspondence, describes the resource mapping signal of these physical channels in fig. 2.First CRS (cell reference signals) is placed in resource mapping, then PCFICH (physical format indicating channel) is placed, terminal system is by obtaining the time-domain symbol number occupied by the control area in this subframe to the decoding of PCFICH, generally base station system can configure 1-3 symbol as control area, and the remaining symbol of this subframe as data area for carrying PDSCH.Base station continues in control area, place PHICH (physics HARQ (mixed automatic retransfer) indicator channel), after completing these resource mappings, not remaining not using resource to be extracted and renumber the candidate resource as PDCCH (Physical Downlink Control Channel) in control area.Relevant CRS, the concrete mapping ruler of PCFICH, PHICH can with reference to TS36.211 standard.
In LTE system, in order to effectively configure PDCCH and other down control channels, define two special control channel resource units, REG (resource unit group, RE group) and CCE (control channel particle, Control Channel Element), a REG is made up of 4 sub-carrier waves adjacent on four frequency domains, and a CCE is made up of some REG, a PDCCH is made up of several CCE again, there is multiple different PDCCH form here to select, list the parameter of PDCCH form 0-3 in Table 1.PDCCH adopts QPSK modulation, is therefore equivalent to every subcarriers and can carries 2bit information.
| PDCCH form | The CCE number comprised | The REG number comprised | The PDCCH bit comprised |
| 0 | 1 | 9 | 72 |
| 1 | 2 | 18 | 144 |
| 2 | 4 | 36 | 288 |
| 3 | 8 | 72 | 576 |
Table 1
In LTE system, in order to be suitable for different transmission environments and demand, multiple DCI (Downlink Control Information is all devised in uplink and downlink, Downlink Control Information) form, for the UE (terminal) of correspondence configures suitable transmission plan, explicit or implicitly in the information of DCI include as this user-selected fixed transformation parameter, the Resourse Distribute of such as this user, the information such as modulation/coding way selection.
Under different transmission modes and bandwidth, DCI has different bit numbers, LTE system is according to the channel conditions of this number with corresponding UE, selection can meet the PDCCH form of transmission quality, the DCI information of correspondence is carried out chnnel coding to produce the coded data of corresponding selected format, the corresponding PDCCH data of DCI information.
PDCCH data will be mapped on physical resource according to the methods below,
First by the residue RE Resource Access of control area out and be combined into N successively
cCEindividual CCE, defines search volume (search space) thereon, may corresponding multiple PDCCH candidate on a search volume.On search volume, the corresponding CCE of corresponding m PDCCH is
formula 1
Wherein, i=0 ... L-1, L are the CCE number that selected PDCCH form is corresponding, also referred to as the degree of polymerization; Y
k=(AY
k-1) modD, Y
-1=n
rNTI≠ 0, A=39827, D=65537,
n
sit is slot index in a 10ms radio frames.
RNTI is used for distinguishing the purposes of the upper information carried of PDCCH,
At present, define a series of RNTI value in a standard,
(1) SI-RNTI: system message;
(2) P-RNTI: paging;
(3) RA-RNTI: sign user sends out the Resource Block that random access guiding uses;
(4) C-RNTI: customer service;
(5) TPC-PUCCH-RNTI:PUCCH uplink power control information;
(6) TPC-PUSCH-RNTI:PUSCH uplink power control information;
(7) usage of SPS C-RNTI is the same with C-RNTI, just uses when semi-persistent scheduling and just uses.
Describe the distribution of 3GPP system to RNTI value in table 2, save from 3GPP TS36.321 7.1
Table 2
A kind of RNTI defines in a standard, all UE need monitoring, such as P-RNTI is FFFE, SI-RNTI is FFFF, information with regard to carrying above knowing when UE detects this two RNTI values time be for paging signaling or be high-rise SIB (system information block, System Information Block) signaling, another is dynamic assignment, such as each UE can be assigned with a unique C-RNTI in the process of access, (Cell Radio Network Temporary Identifier/Identity, Cell-RNTI, Cell Radio Network TemporaryIdentifier) when UE detects the RNTI value with oneself coupling time, just know that information is above one's own, when mapping this two category information, mapping position is different.If common signaling, be then mapped to a public search space, method gets Y
k=0, if the signaling of terminal oneself, be then mapped to user search volume separately according to formula 1.Be equivalent to the search volume of each user by pseudorandom distribution.
Define the search volume of standard TS36.211 support and PDCCH number of candidates, PDCCH search space and the corresponding PDCCH option (3GPPTS 26.213 9.1.1 saves) of support in table 3.
Table 3
Terminal, when detection PDCCH information, needs to attempt all PDCCH possible positions and DCI beared information size, just can think obtain correct configuration information when decoding time the data obtained meet the CRC check rule of itself.
Wherein, user's space and public space, can exist overlapping between user's space, therefore may there is PDCCH resource to collide, Fig. 3 describes the example occurring to collide, UE 1 for the degree of polymerization be the search volume of 4, UE 2 for the degree of polymerization be the search volume of 8, UE 3 for the degree of polymerization be the search volume of 1.In this case, no matter how to distribute UE 2, federation and UE 1 or UE 3 collide.
Base station is by dispatching the collision avoiding information mutual as far as possible.But along with the increase of UE number, support the MIMO technology of high power capacity transmission, and single UE support multiple CC (component carrier) while transmission, and the deployment of heterogeneous network, need the Downlink Control Information of transmission increasing, the capacity constraint problem of such PDCCH is day by day obvious.
In existing technology, generally there is the solution of both direction, a solution is for PDCCH distributes more RE resource, comprise and in the mode of time-division or in the mode of frequency division, the part RE being originally used for PDSCH transmission is used for transmitting PDCCH, such as R-PDCCH scheme, or introduce the transmission means with larger transmission capacity, the space diversity of such as MIMO or the order of modulation of raising transmission symbol.Another kind of solution reduces the carrying bit number of PDCCH, the basis ensureing transmission quality reduces the resource of the RE shared by each PDCCH, adopt less DCI format, or consider the size of the payload (payload) being reduced PDCCH by the mode of difference, ensure that the RE resource of same quantity can dispatch more UE.
Achieving the support to two schemes in a standard at present, one is exactly above-mentioned PDCCH scheme, another is exactly the R-PDCCH scheme for relaying (Relay) system, existing PDCCH takies at most first three symbol of a subframe, if keep existing design constant, do not carry out any enhancing, the requirement of the capacity extension to PDCCH cannot be adapted to; R-PDCCH scheme is then for relatively fixing relay station thus the relatively more fixing and optimal design of carrying out of channel status, and towards the situation of macrocell multi-user, situation is complicated more than relay case, seems that flexibility is not enough.
And for other propose improvement project, also all there is respective deficiency.Such as adopt new DCI to reduce carrying bit, may need to redefine for specific transactions to information bit wherein, can have an impact to the carrying out of business, also need terminal to carry out blind check to this new DCI size simultaneously; Introducing empty point technology then may to designing new demodulated reference signal and demodulation method for this new demodulation mode, and a series of relationship maps problems relevant with the RRE that PDCCH occupies (remote radio frequency equipment) position when solving one group of user when occupying same/frequency resource; The mode of difference is adopted to reduce the size of the payload of each PDCCH, then require that the channel between UE and eNB (evolved base station) and business remain unchanged within a certain period of time, and this is difficult to realize for actual conditions, because become when the service condition of the channel of reality and user is all, therefore can affect the flexibility of scheduling, also cannot make the channel condition of the maximum adaptive UE of PDCCH.
Summary of the invention
The invention provides a kind of method of increasing quantity of physical layer control channel resource, the resource distributing to physical layer control channel can be increased, reduce the probability that resource contention occurs.
Present invention also offers a kind of system of increasing quantity of physical layer control channel resource, the resource distributing to physical layer control channel can be increased, reduce the probability that resource contention occurs.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of method of increasing quantity of physical layer control channel resource, described method comprises:
Step 1, for virtual terminal vUE distributes Radio Network Temporary Identifier RNTI, the RNTI of described distribution is extended wireless Network Temporary Identifier Z-RNTI, supports to have described Z-RNTI in the terminal eUE of expansion;
Step 2, base station scheduling resource from the idling-resource of the data area of subframe distributes to expansion control area, and the physical layer descending control channel PDCCH of eUE is mapped to described expansion control area;
Step 3, the PDCCH of ordinary terminal tUE and described vUE is mapped to the control area of subframe by base station;
Step 4, base station uses described Z-RNTI in the PDCCH data of the control area of described subframe transmission vUE, comprise the resource allocation information of the resource that the described expansion control area of instruction takies in the PDCCH data of described vUE, use the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI of eUE to transmit the PDCCH data of described eUE in described expansion control area;
Step 5, eUE decodes the PDCCH data of described vUE by described Z-RNTI in the search volume of the control area of described subframe, detect PDCCH according to the described resource allocation information in PDCCH data in the search volume of described expansion control area by the C-RNTI of described eUE.
Wherein, described Z-RNTI is that default Z-RNTI value is informed to eUE by signaling by reserved value in RNTI or described base station.
Wherein, described step 3 is further,
Step 31, described vUE, when the PDCCH of tUE and described vUE is mapped to the control area of subframe, is equal to tUE by base station.
Wherein, described step 3 also comprises:
Step 41, the PDCCH of described eUE is mapped to the control area of described subframe by base station;
Described step 5 also comprises:
Step 42, described eUE detects PDCCH by the C-RNTI of self in the search volume of the control area of described subframe.
Wherein, in described step 2, the PDCCH of eUE being mapped to described expansion control area is further,
Step 51, jointly controls region by the resource of the control area of described expansion control area and described subframe composition, jointly controls region described in being mapped to by the PDCCH of eUE;
In the search volume of described expansion control area, detecting PDCCH according to the described resource allocation information in PDCCH data by the C-RNTI of described eUE in described step 5 is further,
Step 52, eUE detects PDCCH in the described search volume jointly controlling region by the C-RNTI of eUE according to the described resource allocation information in PDCCH data.
Wherein, also comprise between described step 2 and described step 1:
Step 61, the physical layer descending shared channel PDSCH of tUE is distributed to from the data area scheduling resource of subframe in base station;
Also comprise between described step 2 and described step 3:
Step 62, the PDSCH of eUE is distributed to from the data area scheduling resource of described subframe in base station;
Described method also comprises:
Step 63, eUE is when decoding PDSCH, and judge whether to comprise in the resource that described PDSCH takies the resource that described expansion control area takies, if comprised, the resource taken described expansion control area is got rid of from the resource that described PDSCH takies.
Wherein, described method also comprises:
Step 71, when base station determines that described eUE quantity is less than predetermined threshold value, is indicated to the control area of described subframe by described expansion control area, to discharge the resource that described expansion control area takies in the data area of described subframe.
The invention also discloses a kind of system of increasing quantity of physical layer control channel resource,
Virtual terminal vUE correspondence is assigned Radio Network Temporary Identifier RNTI, and the RNTI of described distribution is extended wireless Network Temporary Identifier Z-RNTI, supports to be configured with described Z-RNTI in the terminal eUE of expansion;
Described system comprises base station, eUE, and ordinary terminal tUE,
Described base station, distributes to expansion control area for scheduling resource in the idling-resource of the data area from subframe, the physical layer descending control channel PDCCH of eUE is mapped to described expansion control area; The PDCCH of ordinary terminal tUE and described vUE is mapped to the control area of subframe; Use described Z-RNTI in the PDCCH data of the control area of described subframe transmission vUE, comprise the resource allocation information of the resource that the described expansion control area of instruction takies in the PDCCH data of described vUE, use the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI of eUE to transmit the PDCCH data of described eUE in described expansion control area;
Described eUE, decode the PDCCH data of described vUE for the search volume of the control area in described subframe by described Z-RNTI, in the search volume of described expansion control area, detect PDCCH by the C-RNTI of described eUE according to the described resource allocation information in PDCCH data.
Wherein, described base station, when the PDCCH of tUE and described vUE is mapped to the control area of subframe, is further used for described vUE to be equal to tUE.
Wherein, described base station is also for distributing to the physical layer descending shared channel PDSCH of tUE before for described expansion control area Resources allocation from the data area scheduling resource of subframe; After for described expansion control area Resources allocation, distribute to the PDSCH of eUE from the data area scheduling resource of subframe;
Described eUE is also for when decoding PDSCH, and judge whether to comprise in the resource that described PDSCH takies the resource that described expansion control area takies, if comprised, the resource taken described expansion control area is got rid of from the resource that described PDSCH takies.
From above-mentioned, by utilizing the PDCCH of virtual terminal to transmit data, the control area made new advances can be expanded in data area, increasing the capacity of control area; Be compared to the mode of R-PDCCH, the method for salary distribution of the present invention is more flexible, can the change of more effective adaptive channel; Be compared to the method for the introducing transmission modulation system of prior art, the present invention is the transmission method adopting prior art in transmission, and the present invention is more convenient for realizing, and performance is more guaranteed.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of frame structure in LTE;
Fig. 2 is that in LTE, subframe physical resource maps schematic diagram;
Fig. 3 is the schematic diagram that PDCCH resource occurs to collide;
Fig. 4 is the flow chart of the method for increasing quantity of physical layer control channel resource of the present invention;
Fig. 5 is the schematic diagram of the embodiment of the method for increasing quantity of physical layer control channel resource of the present invention;
Fig. 6 A is the schematic diagram that tUE and eUE is mapped to original control area and expansion control area respectively;
Fig. 6 B is that tUE is mapped to control area and eUE is mapped to the schematic diagram jointly controlling region;
Fig. 7 is the flow chart that in the embodiment of the present invention, eUE carries out the embodiment of decoding;
Fig. 8 is the schematic diagram that expansion controls that space takies the afoul situation of resource with the business of eUE.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.
The method of a kind of increasing quantity of physical layer control channel resource of the present invention as shown in Figure 4.Described method comprises the steps.
Step S100, for virtual terminal vUE distributes Radio Network Temporary Identifier RNTI, the RNTI of distribution is extended wireless Network Temporary Identifier Z-RNTI, supports to have Z-RNTI in the terminal eUE of expansion.
In one preferably embodiment, Z-RNTI be reserved value in RNTI or, default Z-RNTI value is informed to eUE by signaling by described base station.
For example, adopt fixed allocation to the method for salary distribution of Z-RNTI, his-and-hers watches 2 change, and the table after change is as shown in table 4.Wherein the value of Z-RNTI also can be other reserved value outside 0xFFFC.
Table 4
There are two kinds of terminal UE in systems in which, the first only carries out the ordinary terminal of work by PDCCH transmission method in standard, be expressed as tUE, simultaneously the second supports that the method for work of the standard of prior art and the present invention expand the terminal of the support expansion of PDCCH method of work, is expressed as eUE.
The virtual terminal being totally considered as corresponding Z-RNTI of eUE, is expressed as vUE, vUE and tUE arranges the transmission of PDCCH in control area by prior art, as described in step S300.
Step S200, base station scheduling resource from the idling-resource of the data area of subframe distributes to expansion control area, the physical layer descending control channel PDCCH of eUE is mapped to expansion control area.
In one embodiment, as shown in Figure 5, in control area, be the resource that 5 tUE distribute resource that PDCCH take and take for vUE distribution PDCCH.The PDCCH method conventionally of 5 tUE points to the resource distributed to respective PDSCH and take respectively.From data area, distribute to scheduling resource in the remaining idling-resource after the PDSCH of tUE distribute to the expansion control area of vUE.
As shown in Figure 6A, for the PDCCH of tUE, by prior art, the PDCCH of tUE is mapped to control area, as described in step S300.For eUE, by the RE Resource Access of expansion control area out and be combined into N successively
cCE_ePDCCHindividual CCE, maps by the PDCCH of formula 1 couple of eUE, and the resource that the PDCCH of such tUE and eUE takies will be distributed in different regions.
Step S300, the PDCCH of ordinary terminal tUE and vUE is mapped to the control area of subframe by base station.
Wherein, vUE, when the PDCCH of tUE and vUE is mapped to the control area of subframe, is equal to tUE by base station.
In one embodiment, as shown in Figure 5, in control area, be the resource that 5 tUE distribute resource that PDCCH take and take for vUE distribution PDCCH.
Step S400, base station uses Z-RNTI in the PDCCH data of the control area of subframe transmission vUE, comprise the resource allocation information of the resource that indication extension control area takies in the PDCCH data of vUE, use the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI of eUE in the PDCCH data of expansion control area transmission eUE.
In an embodiment, vUE does not have corresponding physical end in practice, do not have actual terminal that the information above the PDCCH of vUE can be utilized to transmit, therefore can redefine information bit in the PDCCH data of vUE, pointed to one piece of PDSCH region, this block region is exactly new expansion described expansion control area out, is expressed as ePDCCH region.Such as, the information that the PDCCH of vUE carries above adopts DCI format 2 (TS36.2125.3.3.1.5 joint), wherein comprise the power adjustment commands that TPC2 bit is used to indicate PUCCH, this information is used to carry out PUCCH (physical layer ascending control channel) transmission because do not have terminal in reality, so the symbolic number that these bits occupy to the time domain defining ePDCCH region can be utilized, if the time domain original position in prespecified ePDCCH region is first symbol of data area, then can draw the symbol ordinal number that ePDCCH region takies.In DCI (Downlink Control Information) form 2, also comprising resource allocation bit (Resourceblock assignment), for representing that the frequency domain resource of a user is distributed, this definition can be maintained.Like this, in the PDCCH data of vUE, comprise the resource allocation information of the resource that instruction ePDCCH region takies.The resource allocation methods of ePDCCH of the present invention is not restricted to aforementioned citing.Distribute and meet restrictive condition, ePDCCH region allocation is not distributed to the resource of the data area of the free time of terminal traffic, as shown in Figure 5.Distribution like this can not have an impact to the data demodulates of other distribution service terminals.
Step S500, eUE decode the PDCCH data of vUE by Z-RNTI in the search volume of the control area of subframe, detect PDCCH according to the resource allocation information in PDCCH data in the search volume of expansion control area by the C-RNTI of this eUE.
For tUE, according to distributing to oneself RNTI, i.e. the C-RNTI of tUE, carry out normal PDCCH decoding, obtain resource mapping, the method with prior art does not have difference.
For eUE, all eUE all suppose oneself to be equal to vUE, decode, obtain the information bit carried above to the PDCCH of vUE corresponding to Z-RNTI, know the resource of expansion shared by control area.Such as, the resource of expansion shared by control area is known by TPC 2 bit and resource allocation bit.
In one preferably execution mode, the PDCCH of eUE maps as described below.
Step S210A, the physical layer descending control channel PDCCH of eUE is mapped to expansion control area by base station.
Step S320A, the PDCCH of eUE is mapped to the control area of subframe by base station.
Step S510A, eUE detect PDCCH by the C-RNTI of self in the search volume of the control area of subframe and expansion control area.
Because tUE only knows original control area, the distribution of PDCCH in control area of tUE can not change, and the distribution of the PDCCH of eUE then can distribute different from the PDCCH of prior art.
PDCCH mapping is carried out by the RNTI of this eUE to an eUE by existing method and method of the present invention in base station simultaneously.By the RE Resource Access of expansion control area out and be combined into N successively
cCE_ePDCCHindividual CCE, calculates search volume by formula 1, maps the PDCCH of eUE; And adopt prior art that the PDCCH of eUE is mapped to control area.EUE, when decoding, detects PDCCH simultaneously in the search volume of control area and the search volume of expansion control area.
In another preferably execution mode, base station scheduling resource from the idling-resource of the data area of subframe distributes to expansion control area.In described step S200, the PDCCH of eUE being mapped to expansion control area is further:
Step S210B, jointly controls region by the resource composition expanding the control area of control area and subframe, is mapped to by the PDCCH of eUE and jointly controls region.
In the search volume of expansion control area, detecting PDCCH according to the resource allocation information in PDCCH data by the C-RNTI of eUE in described step S500 is further:
Step S510B, eUE detect PDCCH according to the search volume that the resource allocation information in PDCCH data is jointly controlling region by the C-RNTI of eUE.
As shown in Figure 6B, the RE Resource Access of expansion control area is out also combined into N ' with original control area
cCE_ePDCCHindividual CCE; Map by formula 1, the PDCCH of such eUE will be distributed in original control area and expansion control area again.
If be there is resource collision by being allocated to tUE and eUE simultaneously in certain CCE, or between eUE, also resource collision occurs between tUE, base station, when sending PDCCH data, is selected this time to transmit the PDCCH data of tUE or the PDCCH data of eUE on the resource.
In one preferably execution mode, when base station determines that current eUE quantity is less than predetermined threshold value, expansion control area is indicated to the control area of described subframe, to discharge the resource that expansion control area takies in the data area of described subframe.
Base station completes instruction by specific bit or resource allocation information on beared information in the PDCCH data of vUE.Now, the control area expanding control area and subframe is overlapping.The expansion control area that eUE is obtained by vUE is actual is the control area of subframe.
In this embodiment, due to eUE negligible amounts, therefore base station determines not for eUE distributes independent extending space, saves data area resource, embodies flexibility of the present invention.
In the embodiment of the present invention, eUE carries out the flow process of decoding as shown in Figure 7.
Step S701, eUE carry out PDCCH decoding by the search volume of Z-RNTI in the control area of subframe corresponding to Z-RNTI to the PDCCH data of vUE.
Step S702, eUE judge whether the PDCCH of vUE exists, if existed, perform step S704, if there is no, perform step S703.
Step S703, eUE press the PDCCH of the C-RNTI detection eUE of eUE in original control area.
Detect in search volume, when eUE detects the C-RNTI value coupling with oneself, know the data of transmission to one's name.
Step S704, eUE judge whether that employing jointly controls region, if so, then perform step S705, otherwise, perform step S706.
Step S705, eUE detect the PDCCH of eUE in the search volume jointly controlling region by C-RNTI.
Detect in the search volume jointly controlling region, when eUE detects the PDCCH data with the C-RNTI value coupling of oneself in the search volume of the C-RNTI of oneself, know the data of transmission to one's name.
Step S706, determines whether that the PDCCH of eUE maps in original control area and expansion control area simultaneously, if so, then performs step S708, otherwise, perform step S707.
Step S707, eUE press the PDCCH that C-RNTI detects eUE in the search volume in expansion control area.
Detect in the search volume of expansion control area, when eUE detects the C-RNTI value coupling with oneself, know the data of transmission to one's name.
Step S708, eUE press the PDCCH that C-RNTI detects eUE in the search volume of original control area and the search volume of expansion control area.
Detect in the search volume of original control area and expansion control area, when eUE detects the C-RNTI value coupling with oneself, know the data of transmission to one's name.
In a kind of embodiment, base station scheduling resource from the idling-resource of the data area of subframe distributes to expansion control area.Described step S200 is further, distributes to the PDSCH of physical layer descending shared channel PDSCH and eUE of tUE from the data area scheduling resource of subframe, and then, from the idling-resource of the remaining data area of subframe, scheduling resource distributes to expansion control area.Can not be there is resource and collide in distribution like this, but may produce the wasting of resources.
In another kind of embodiment, described step S200 is further for distributing to the physical layer descending shared channel PDSCH of tUE from the data area scheduling resource of subframe before the Resources allocation of expansion control area; After for described expansion control area Resources allocation, distribute to the PDSCH of eUE from the data area scheduling resource of subframe.
Adopt the method, because during the resource of base station assigns data area, first by the Resourse Distribute of data area to the PDSCH of tUE, the more remaining idling-resource of data area being distributed to expansion control area, is then that eUE distributes the resource that takies of PDSCH by prior art.Thus, the situation of expansion control area resource is comprised in the resource that the PDSCH that there will be eUE takies.
Expansion controls space and takies situation that resource collides mutually as shown in Figure 8 with the business of eUE.
In fig. 8, have two eUE to be scheduled, the range of distribution of eUE 1 is clear area, do not need special work, and in the range of distribution of eUE2, some is occupied by ePDCCH region.
EUE, when decoded PHY DSCH Downlink Shared Channel PDSCH, judges whether comprise the resource expanded control area and take in the resource that PDSCH takies, if comprised, the resource that expansion control area takies is got rid of from the resource that this PDSCH takies.
Because eUE has decoded the distributed intelligence of expansion control area, can carry out judging and getting rid of.
The invention also discloses a kind of system of increasing quantity of physical layer control channel resource.
For virtual terminal vUE distributes Radio Network Temporary Identifier RNTI, the RNTI of described distribution is extended wireless Network Temporary Identifier Z-RNTI, supports to have described Z-RNTI in the terminal eUE of expansion.
System comprises base station, eUE, and ordinary terminal tUE.
Described base station, distributes to expansion control area for scheduling resource in the idling-resource of the data area from subframe, the physical layer descending control channel PDCCH of eUE is mapped to expansion control area; The PDCCH of ordinary terminal tUE and vUE is mapped to the control area of subframe; Use Z-RNTI in the PDCCH data of the control area of subframe transmission vUE, comprise the resource allocation information of the resource that the described expansion control area of instruction takies in the PDCCH data of vUE, use the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI of eUE to transmit the PDCCH data of described eUE in expansion control area.
Described eUE, decode the PDCCH data of vUE for the search volume of the control area in described subframe by described Z-RNTI, in the search volume of described expansion control area, detect PDCCH by the C-RNTI of described eUE according to the described resource allocation information in PDCCH data.
Wherein, described Z-RNTI is that default Z-RNTI value is informed to eUE by signaling by reserved value in RNTI or base station.
Wherein, described base station, when the PDCCH of tUE and vUE is mapped to the control area of subframe, is further used for described vUE to be equal to tUE.
In one preferably execution mode, described base station is further used for the resource of the control area of described expansion control area and described subframe composition to jointly control region when the PDCCH of eUE is mapped to described expansion control area, jointly control region described in being mapped to by the PDCCH of eUE.
Described eUE is further used for when detecting PDCCH by the C-RNTI of described eUE according to the described resource allocation information in PDCCH data in the search volume of described expansion control area detecting PDCCH in the described search volume jointly controlling region by the C-RNTI of eUE according to the described resource allocation information in PDCCH data.
In one preferably execution mode, base station is also for being mapped to the control area of described subframe by the PDCCH of described eUE; EUE also detects PDCCH for the C-RNTI by self in the search volume of the control area of described subframe.
In one preferably execution mode, described base station is also for distributing to the physical layer descending shared channel PDSCH of tUE before for described expansion control area Resources allocation from the data area scheduling resource of subframe; After for described expansion control area Resources allocation, distribute to the PDSCH of eUE from the data area scheduling resource of subframe.
Described eUE is also for when decoding PDSCH, and judge whether to comprise in the resource that described PDSCH takies the resource that described expansion control area takies, if comprised, the resource taken described expansion control area is got rid of from the resource that described PDSCH takies.
In one preferably execution mode, base station is also for when determining that described eUE quantity is less than predetermined threshold value, described expansion control area is indicated to the control area of described subframe, to discharge the resource that described expansion control area takies in the data area of described subframe.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. a method for increasing quantity of physical layer control channel resource, is characterized in that, described method comprises:
Step 1, support the virtual terminal vUE being totally considered as corresponding Z-RNTI of the terminal eUE of expansion, for virtual terminal vUE distributes Radio Network Temporary Identifier RNTI, the RNTI of described distribution is extended wireless Network Temporary Identifier Z-RNTI, supports to have described Z-RNTI in the terminal eUE of expansion;
Step 61, the physical layer descending shared channel PDSCH of tUE is distributed to from the data area scheduling resource of subframe in base station;
Step 2, base station scheduling resource from the idling-resource of the data area of subframe distributes to expansion control area, and the physical layer descending control channel PDCCH of eUE is mapped to described expansion control area;
Step 62, the PDSCH of eUE is distributed to from the data area scheduling resource of described subframe in base station;
Step 3, the PDCCH of ordinary terminal tUE and described vUE is mapped to the control area of subframe by base station; Described vUE, when the PDCCH of tUE and described vUE is mapped to the control area of subframe, is equal to tUE by base station;
Step 4, base station uses described Z-RNTI in the PDCCH data of the control area of described subframe transmission vUE, comprise the resource allocation information of the resource that the described expansion control area of instruction takies in the PDCCH data of described vUE, use the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI of eUE to transmit the PDCCH data of described eUE in described expansion control area;
Step 5, eUE decodes the PDCCH data of described vUE by described Z-RNTI in the search volume of the control area of described subframe, detect PDCCH according to the described resource allocation information in PDCCH data in the search volume of described expansion control area by the C-RNTI of described eUE;
Step 63, eUE is when decoding PDSCH, and judge whether to comprise in the resource that described PDSCH takies the resource that described expansion control area takies, if comprised, the resource taken described expansion control area is got rid of from the resource that described PDSCH takies.
2. the method for increasing quantity of physical layer control channel resource according to claim 1, is characterized in that,
Described Z-RNTI is that default Z-RNTI value is informed to eUE by signaling by reserved value in RNTI or described base station.
3. the method for increasing quantity of physical layer control channel resource according to claim 1, is characterized in that,
Described step 3 also comprises:
Step 41, the PDCCH of described eUE is mapped to the control area of described subframe by base station;
Described step 5 also comprises:
Step 42, described eUE detects PDCCH by the C-RNTI of self in the search volume of the control area of described subframe.
4. the method for increasing quantity of physical layer control channel resource according to claim 1, is characterized in that,
In described step 2, the PDCCH of eUE being mapped to described expansion control area is further,
Step 51, jointly controls region by the resource of the control area of described expansion control area and described subframe composition, jointly controls region described in being mapped to by the PDCCH of eUE;
In the search volume of described expansion control area, detecting PDCCH according to the described resource allocation information in PDCCH data by the C-RNTI of described eUE in described step 5 is further,
Step 52, eUE detects PDCCH in the described search volume jointly controlling region by the C-RNTI of eUE according to the described resource allocation information in PDCCH data.
5. the method for increasing quantity of physical layer control channel resource according to claim 1, is characterized in that,
Described method also comprises:
Step 71, when base station determines that described eUE quantity is less than predetermined threshold value, is indicated to the control area of described subframe by described expansion control area, to discharge the resource that described expansion control area takies in the data area of described subframe.
6. a system for increasing quantity of physical layer control channel resource, is characterized in that,
Support the virtual terminal vUE being totally considered as corresponding Z-RNTI of the terminal eUE of expansion, virtual terminal vUE correspondence is assigned Radio Network Temporary Identifier RNTI, the RNTI of described distribution is extended wireless Network Temporary Identifier Z-RNTI, supports to have described Z-RNTI in the terminal eUE of expansion;
Described system comprises base station, eUE, and ordinary terminal tUE,
Described base station, distributes to expansion control area for scheduling resource in the idling-resource of the data area from subframe, the physical layer descending control channel PDCCH of eUE is mapped to described expansion control area; The PDCCH of ordinary terminal tUE and described vUE is mapped to the control area of subframe; Use described Z-RNTI in the PDCCH data of the control area of described subframe transmission vUE, comprise the resource allocation information of the resource that the described expansion control area of instruction takies in the PDCCH data of described vUE, use the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI of eUE to transmit the PDCCH data of described eUE in described expansion control area; Described base station, when the PDCCH of tUE and described vUE is mapped to the control area of subframe, is further used for described vUE to be equal to tUE;
Described eUE, decode the PDCCH data of described vUE for the search volume of the control area in described subframe by described Z-RNTI, in the search volume of described expansion control area, detect PDCCH by the C-RNTI of described eUE according to the described resource allocation information in PDCCH data;
Described base station is also for distributing to the physical layer descending shared channel PDSCH of tUE before for described expansion control area Resources allocation from the data area scheduling resource of subframe; After for described expansion control area Resources allocation, distribute to the PDSCH of eUE from the data area scheduling resource of subframe;
Described eUE is also for when decoding PDSCH, and judge whether to comprise in the resource that described PDSCH takies the resource that described expansion control area takies, if comprised, the resource taken described expansion control area is got rid of from the resource that described PDSCH takies.
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| RU2604875C2 (en) * | 2012-07-02 | 2016-12-20 | Интел Корпорейшн | Indexing elements expanded control channel for physical downlink control channel search space |
| CN104144503B (en) * | 2013-05-10 | 2017-11-24 | 中国电信股份有限公司 | Dynamic improves method, system and the mobile terminal of the PDCCH capacity upper limit |
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| JP6800439B2 (en) * | 2016-07-07 | 2020-12-16 | フラウンホーファー−ゲゼルシャフト・ツール・フェルデルング・デル・アンゲヴァンテン・フォルシュング・アインゲトラーゲネル・フェライン | Data transmission in wireless communication systems with reduced latency |
| CN109792627B (en) * | 2016-10-07 | 2022-04-19 | 瑞典爱立信有限公司 | Network node and method for monitoring system coverage in a wireless communication network |
| WO2019090516A1 (en) * | 2017-11-08 | 2019-05-16 | Qualcomm Incorporated | Radio network identifier spreading |
| CN110621069B (en) * | 2018-06-19 | 2022-01-04 | 维沃移动通信有限公司 | Data transmission method, equipment and system |
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