CN104754741A - Search space determining method - Google Patents
Search space determining method Download PDFInfo
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- CN104754741A CN104754741A CN201310753313.XA CN201310753313A CN104754741A CN 104754741 A CN104754741 A CN 104754741A CN 201310753313 A CN201310753313 A CN 201310753313A CN 104754741 A CN104754741 A CN 104754741A
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- Prior art keywords
- control channel
- downlink control
- physical downlink
- described physical
- repetition period
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Classifications
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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 signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Abstract
Disclosed is a method for determining search space of physical downlink control channels in wireless communication systems. The physical downlink control channels are repeated periodically in time domain. The method is characterized in that, in the repetition period of the physical downlink control channels, the start position of the search space of the physical downlink control channels keeps unchanged.
Description
Technical field
The present invention relates to communication technical field, particularly relate to wireless communication technology field.
Background technology
At wireless communication field, in recent years, machine type communication (Machine TypeCommunication is called for short MTC) is just receiving lasting concern.Some MTC device, typically such as intelligent instrument, need to be arranged on basement, and the transmission loss be therefore subject to is very large, to such an extent as to these equipment possibly cannot effectively be connected with the network equipment.Thus 3GPP has offered the problem that is directed to the coverage increasing low cost MTC device specially.Its target is that the coverage increasing this type of MTC device reaches 15dB.
In existing 3GPP specification, transfer of data is that physically based deformation down control channel (Physical Downlink Control Channel is called for short PDCCH) carries out dispatching.And in order to realize the covering gain of 15dB in MTC device, the PDCCH signal of its correspondence is estimated will repeat transmission up to a hundred times.Apply higher polymerization rank (Aggregation Level is called for short AL) and number of repetition can be reduced to a certain extent to save the power consumption of equipment, but the realization covering gain generally must depend on the periodicity of PDCCH signal in time domain and repeat.
In current specification, comprise the signal of subscriber equipment (User Equipment is called for short UE) meeting all possible PDCCH channel of blind decoding in a subframe of MTC device to find that PDCCH channel for dispatching itself.And the position of control channel unit (Control Channel Element is called for short CCE) shared by each PDCCH channel and quantity can change in each subframe, to avoid continuous congestion.Based on same reason, the search volume (search space) of each PDCCH channel also changes in units of subframe.This change realizes with certain hash function (hash function), thus the randomness provided to a certain degree is to avoid continuous congestion.
Be not difficult to find out, between existing search volume mechanism and the periodicity of PDCCH signal in time domain repeat, there is certain contradiction.When PDCCH signal demand carries out repetition in up to a hundred subframes, and the search volume of each subframe different when, above-mentioned MTC device must in all subframes within the repetition period all possible PDCCH channel of blind decoding to find that to repeat but the PDCCH channel that changes of search volume always.Obviously, this considerably increases the complexity that MTC device realizes; Low cost own with MTC device, the design concept easily realized is inconsistent.
So target of the present invention is exactly find a kind of method of novel determination PDCCH channel search space; This method needs can be applicable to the situation of PDCCH signal in the enterprising line period repetition of time domain, to realize the covering gain of MTC device; Also wanting can be complicated not too much, in order to avoid increase the cost of MTC device; Also want can compatible as much as possible existing specification simultaneously, avoids the change of existing protocol excessive.
Summary of the invention
For solving the aforementioned problems in the prior, the present invention proposes a kind of method of novel determination PDCCH channel search space.By the search volume changed based on subframe being changed into the search volume based on repetition period change, reaching and realizing the periodicity repetition of PDCCH signal in time domain in a straightforward manner, thus solving the problems referred to above existed in existing specification.
Particularly, according to a first aspect of the invention, propose a kind of method determining the search volume of Physical Downlink Control Channel in a wireless communication system, wherein, described Physical Downlink Control Channel is in the repetition of time domain periodic, described method is characterized in that: within the repetition period of described Physical Downlink Control Channel, and the original position of the search volume of described Physical Downlink Control Channel is constant.
Preferably, the hash function relevant to the repetition period of described Physical Downlink Control Channel is used to determine the original position of the search volume of described Physical Downlink Control Channel.
More preferably, following formula is used to determine the original position of the search volume of described Physical Downlink Control Channel:
Wherein, L representative polymerization rank; Y
jthe hash function that representative is described relevant to the repetition period of described Physical Downlink Control Channel; M=0 ..., M-1, M represent the quantity of possible described Physical Downlink Control Channel; N
cCE, krepresent the sum controlling Channel Elements in subframe k, i=0 ..., L-1.
More preferably, the hash function Y that the repetition period of described and described Physical Downlink Control Channel is relevant
jfor:
Y
j＝(A·Y
j-1)modD
Wherein, Y
-1=n
rNTI, n
rNTIrepresent Radio Network Temporary Identifier; A=39827; D=65537; J is determined by following formula:
Wherein, SFN representative system frame number; R represents the repetition period of described Physical Downlink Control Channel;
, ns represents the timeslot number in radio frames.
More preferably, the hash function Y that the repetition period of described and described Physical Downlink Control Channel is relevant
jfor:
Y
j＝(A·Y
j-1)modD
Wherein, Y
-1=n
rNTI, n
rNTIrepresent Radio Network Temporary Identifier; A=39827; D=65537; J is determined by following formula:
Wherein, SFN representative system frame number; R represents the repetition period of described Physical Downlink Control Channel;
ns represents the timeslot number in radio frames; K2
idetermined by following formula:
(10*SFN
i+n
i+k1
i)MOD(R+k2
i)＝0
Wherein, SFN
irepresent the System Frame Number of the repetition period of i-th described Physical Downlink Control Channel; n
irepresent the initial subframe number in the repetition period of i-th described Physical Downlink Control Channel; R represents the repetition period of described Physical Downlink Control Channel, k1
iand k2
irepresentative and n
irelevant side-play amount.
More preferably, for public search space reserves physical resource.
More preferably, following formula is used to determine the original position of the search volume of described Physical Downlink Control Channel:
Wherein, L representative polymerization rank; Y
jthe hash function that representative is described relevant to the repetition period of described Physical Downlink Control Channel; M=0 ..., M-1, M represent the quantity of possible described Physical Downlink Control Channel, N
cCE, krepresent the sum controlling Channel Elements in subframe k; n
cCE, CSSbe represented as the control channel unit that public search space is reserved, i=0 ..., L-1.
Preferably, within the repetition period of described Physical Downlink Control Channel, multiple polymerization rank can be configured.
More preferably, within the repetition period of described Physical Downlink Control Channel, multiple described search volume can be configured.
More preferably, the control channel unit forming described search volume is non-continuous distribution, it is characterized in that, constant in the repetition period being distributed in described Physical Downlink Control Channel of described control unit.
In the present invention, to be transformed into search volume to change based on the repetition period by designing new function, thus achieve search volume in the repetition period and remain unchanged, the realization that MTC device blind decoding is operated simplifies greatly; In turn ensure that search volume is different on the different repetition periods simultaneously, therefore avoid the appearance of Persistent Congestion; In preferred scheme, the resource of public search space can also be reserved, realize the object of flexible dispatching, it also avoid the impact on other types subscriber equipment; And farthest compatible existing specification, avoid the excessive change to agreement, thus reach object of the present invention.
Accompanying drawing explanation
Read the following detailed description to non-limiting example by referring to accompanying drawing, giving the further feature of invention, object and advantage will be more obvious.
Fig. 1 shows according to a kind of flow chart determining PDCCH channel search space-wise of the present invention.
Wherein, same or analogous Reference numeral represents same or analogous steps characteristic or device/module.
Embodiment
In the specific descriptions of following preferred embodiment, with reference to the accompanying drawing formed appended by a part of the present invention.Appended accompanying drawing shows by way of example and can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiments of the present invention.Be appreciated that under the prerequisite not departing from scope of the present invention, other embodiments can be utilized, also can carry out amendment that is structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention limited by appended claim.
First, in existing 3GPP specification, the search volume of PDCCH channel is defined by following formula:
Wherein, L representative polymerization rank AL; Y
krepresent certain hash function; M=0 ..., M-1, and M represents the quantity of possible PDCCH channel; N
cCE, krepresent the sum of the CCE comprised in subframe k, i=0 ..., L-1.And wherein Y
kthe hash function of representative is defined as follows in existing specification:
Y
k＝(A，Y
k-1)modD (2)
Wherein, Y
-1=n
rNTI, nRNTI represents Radio Network Temporary Identifier (radio networktemporary identifier is called for short RNTI); A=39827; D=65539;
, the time slot (slot) number of ns representative in this radio frames.As can be seen from formula (2), the hash function Y of present Normalization rule
kbased on subframe change, namely in each different subframe, the initial CCE position of the search volume of same PDCCH channel is all different.
Therefore, according to the present invention proposes the one amendment of above-mentioned PDCCH channel search space, namely, when the repetition of certain PDCCH channel at time domain periodic, in each subframe within a repetition period of this PDCCH channel, the initial CCE position of the search volume of this PDCCH channel is all constant.
To figure 1 show according to of the present invention according to a kind of flow chart determining PDCCH channel search space-wise of the present invention, comprise the steps:
S11., within the repetition period of described Physical Downlink Control Channel, the original position of the search volume of described Physical Downlink Control Channel is constant.
Concrete, according to one embodiment of present invention, propose the hash function Y based on subframe
kreplace to the hash function Y based on PDCCH channel repeat period
j.Use Y
jobject be can ensure that within the repetition period search volume is constant, random distribution to a certain degree can be realized again between the repetition period, thus reduce the probability of congested generation.Like this, new search volume can be expressed as following formula:
Wherein, L represents AL; Y
jthe hash function that representative is described relevant to the repetition period of described Physical Downlink Control Channel; M=0 ..., M-1, M represent the quantity of possible PDCCH channel; N
cCE, krepresent the sum controlling Channel Elements in subframe k, i=0 ..., L-1.Must be pointed out; formula (3) is just according to a kind of implementation determining the method for search volume of the present invention; based on the hash function of repetition period, other any uses determine that the formula of search volume can reach identical effect, thus all belong to protection scope of the present invention.
Further, according to another embodiment of the invention, the Y in formula (3)
jcan be expressed as following formula:
Y
j＝(A·Y
j-1)modD (4)
Wherein, Y
-1=n
rNTI; A=39827; D=65537; J is determined by following formula:
Wherein, SFN representative system frame number; R represents the repetition period of PDCCH channel; K=
ns represents the timeslot number in radio frames.As can be seen from formula (5), owing to introducing repetition period R, therefore in each repetition period R, the initial CCE position of the search volume in each subframe is all identical; And between different repetition period R, the initial CCE position of search volume is then different.For example, as R=50, in front 50 subframes, the initial CCE position in PDCCH channel search space is all identical; And to the 51st subframe, the initial CCE position in PDCCH channel search space there occurs change, and keep this rear initial CCE position subsequently until the 100th subframe, and the like.
Preferred, congested probability is there is in order to reduce further, according to another embodiment of the invention, the hash function used can be changed when each repetition period terminates, namely use different hash functions to determine search volume in each repetition period, and all these hash functions are all based on the repetition period.Following formula gives a formula based on the hash function of this embodiment:
Y
j＝(A·Y
j-1)modD (4-1)
Wherein, Y
-1=n
rNTI, n
rNTIrepresent Radio Network Temporary Identifier; A=39827; D=65537; J is determined by following formula:
Wherein, SFN representative system frame number; R represents the repetition period of described Physical Downlink Control Channel;
, ns represents the timeslot number in radio frames; K2
idetermined by following formula:
(10*SFN
i+n
i+k1
i)MOD(R+k2
i)＝0 (6)
Wherein, SFN
irepresent the System Frame Number of the repetition period of i-th described Physical Downlink Control Channel; n
irepresent the initial subframe number in the repetition period of i-th described Physical Downlink Control Channel; R represents the repetition period of described Physical Downlink Control Channel, k1
iand k2
irepresentative and n
irelevant side-play amount.As can be seen from formula (6), owing to introducing side-play amount k2
i, the parameter j therefore drawn by formula (5-1) is not identical on each repetition period R, thus makes the formula (4-1) that each repetition period R uses become different yet.Achieve higher randomness like this, can effectively prevent congested situation.
In addition, consider PDCCH repeat send certainly will take a large amount of channel resources, inevitably improve the Congestion Level SPCC of system, in extreme situations, even likely have influence on the public search space (Common Search Space is called for short CSS) of public control channel.And well-known, CSS is important system resource, must manage the impact repeating to cause it reducing PDCCH.Therefore, according to another embodiment of the invention, propose to determine on the method basis in PDCCH channel search space in use based on the hash function of repetition period, for CSS reserves physical resource, shared by the PDCCH that the resource that CSS is used can not be repeatedly transmitted, what thus avoid PDCCH repeats the impact of transmission on CSS.
Further, according to another embodiment of the invention, search volume can be expressed as following formula:
Wherein, L represents AL; Y
jrepresent the hash function relevant to the repetition period of PDCCH; M=0 ..., M-1, M represent the quantity of possible described Physical Downlink Control Channel, N
cCE, krepresent the sum of CCE in subframe k; n
cCE, CSSbe represented as the CCE that CSS is reserved, i=0 ..., L-1.Obviously, other any uses are based on the hash function of repetition period, and the formula reserving the determination search volume of physical resource for CSS can reach identical effect, thus all belongs to protection scope of the present invention.
In addition, in order to meet the needs of flexible dispatching, according to another embodiment of the invention, multiple different repetition period can also be configured in a MTC device, or on a repetition period, configure multiple AL, in this case, this MTC device needs on this multiple repetition period, to carry out blind decoding operation to obtain corresponding PDCCH signal.
And in order to improve the service efficiency of channel resource, according to another embodiment of the invention, multiple search volume can also be configured on a repetition period.Such as, all subframes in the repetition period can be divided into two groups by the odd even of subframe numbers, often group is respectively used to different search volumes, and MTC device is also corresponding the odd even of the signal received by subframe numbers is merged respectively, and carries out blind decoding thus obtain corresponding PDCCH signal.
Finally, in order to reduce further, congested probability occurs, another is real according to of the present invention, and the CCE of composition search volume can be non-continuous distribution, as long as constant in the repetition period R being distributed in PDCCH ensureing these CCE.For example, as AL=8, search volume takies 8 CCE, and these 8 CCE can be logically non-continuous distribution, are such as two groups that are divided into 4 CCE mono-group, 4, interval CCE between two groups.As long as ensure in same repetition period R, in each subframe, these 8 CCE are such distributions, just same applicable method of the present invention.
Be described embodiments of the invention above, but the present invention is not limited to specific system, equipment and concrete agreement, those skilled in that art can make various distortion or amendment within the scope of the appended claims.
The those skilled in the art of those the art can pass through research specification, disclosed content and accompanying drawing and appending claims, understand and implement other changes to the execution mode disclosed.In the claims, word " comprises " element and step of not getting rid of other, and wording " one " does not get rid of plural number.In the present invention, " first ", " second " only represent title, do not represent orbution.In the practical application of invention, the function of the multiple technical characteristics quoted during a part possibility enforcement of rights requires.Any Reference numeral in claim should not be construed as the restriction to scope.
Claims (10)
1. determine a method for the search volume of Physical Downlink Control Channel in a wireless communication system, wherein, described Physical Downlink Control Channel is in the repetition of time domain periodic, and described method is characterized in that:
Within the repetition period of described Physical Downlink Control Channel, the original position of the search volume of described Physical Downlink Control Channel is constant.
2. method according to claim 1, wherein, uses the hash function relevant to the repetition period of described Physical Downlink Control Channel to determine the original position of the search volume of described Physical Downlink Control Channel.
3. method according to claim 2, wherein, uses following formula to determine the original position of the search volume of described Physical Downlink Control Channel:
Wherein, L representative polymerization rank; Y
jthe hash function that representative is described relevant to the repetition period of described Physical Downlink Control Channel; M=0 ..., M-1, M represent the quantity of possible described Physical Downlink Control Channel; N
cCE, krepresent the sum controlling Channel Elements in subframe k, i=0 ..., L-1.
4. method according to claim 3, wherein, the hash function Y that repetition period of described and described Physical Downlink Control Channel is relevant
jfor:
Y
j＝(A·Y
j-1)modD
Wherein, Y
-1=n
rNTI, n
rNTIrepresent Radio Network Temporary Identifier; A=39827; D=65537; J is determined by following formula:
Wherein, SFN representative system frame number; R represents the repetition period of described Physical Downlink Control Channel;
, ns represents the timeslot number in radio frames.
5. method according to claim 3, wherein, the hash function Y that repetition period of described and described Physical Downlink Control Channel is relevant
jfor:
Y
j＝(A·Y
j-1)modD
Wherein, Y
-1=n
rNTI, n
rNTIrepresent Radio Network Temporary Identifier; A=39827; D=65537; J is determined by following formula:
Wherein, SFN representative system frame number; R represents the repetition period of described Physical Downlink Control Channel;
ns represents the timeslot number in radio frames; K2
idetermined by following formula:
(10*SFN
i+n
i+k1
i)MOD(R+k2
i)＝0
Wherein, SFN
irepresent the System Frame Number of the repetition period of i-th described Physical Downlink Control Channel; n
irepresent the initial subframe number in the repetition period of i-th described Physical Downlink Control Channel; R represents the repetition period of described Physical Downlink Control Channel, k1
iand k2
irepresentative and n
irelevant side-play amount.
6. method according to claim 2, is characterized in that, for public search space reserves physical resource.
7. method according to claim 6, wherein, uses following formula to determine the original position of the search volume of described Physical Downlink Control Channel:
Wherein, L representative polymerization rank; Y
jthe hash function that representative is described relevant to the repetition period of described Physical Downlink Control Channel; M=0 ..., M-1, M represent the quantity of possible described Physical Downlink Control Channel, N
cCE, krepresent the sum controlling Channel Elements in subframe k; n
cCE, CSSbe represented as the control channel unit that public search space is reserved, i=0 ..., L-1.
8. method according to claim 1, wherein, within the repetition period of described Physical Downlink Control Channel, can configure multiple polymerization rank.
9. method according to claim 1, wherein, within the repetition period of described Physical Downlink Control Channel, can configure multiple described search volume.
10. method according to claim 1, wherein, the control channel unit forming described search volume is non-continuous distribution, it is characterized in that, constant in the repetition period being distributed in described Physical Downlink Control Channel of described control unit.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753313.XA CN104754741B (en) | 2013-12-31 | 2013-12-31 | A kind of method of determining search space |
| TW103144086A TW201528748A (en) | 2013-12-31 | 2014-12-17 | Method for determining search space |
| PCT/IB2014/003070 WO2015101833A1 (en) | 2013-12-31 | 2014-12-17 | Method for determining search space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753313.XA CN104754741B (en) | 2013-12-31 | 2013-12-31 | A kind of method of determining search space |
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| Publication Number | Publication Date |
|---|---|
| CN104754741A true CN104754741A (en) | 2015-07-01 |
| CN104754741B CN104754741B (en) | 2018-08-14 |
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ID=52814141
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|---|---|---|---|
| CN201310753313.XA Active CN104754741B (en) | 2013-12-31 | 2013-12-31 | A kind of method of determining search space |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN104754741B (en) |
| TW (1) | TW201528748A (en) |
| WO (1) | WO2015101833A1 (en) |
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| CN106911999A (en) * | 2015-12-23 | 2017-06-30 | 中兴通讯股份有限公司 | The determination method and device of search space in narrowband systems |
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| CN110034863A (en) * | 2018-01-12 | 2019-07-19 | 华为技术有限公司 | The transmission method and communication device of data packet |
| WO2019137483A1 (en) * | 2018-01-12 | 2019-07-18 | 华为技术有限公司 | Data packet transmission method and communication device |
| CN111713157A (en) * | 2018-02-16 | 2020-09-25 | 高通股份有限公司 | Physical downlink control channel hash function update |
| CN110492972A (en) * | 2018-05-14 | 2019-11-22 | 北京松果电子有限公司 | Blind examination control method, device, base station, user equipment and storage medium |
| CN110536420A (en) * | 2018-05-23 | 2019-12-03 | 中国移动通信有限公司研究院 | Configure the method and apparatus of physical downlink control channel time domain detection position |
| CN110536420B (en) * | 2018-05-23 | 2022-04-01 | 中国移动通信有限公司研究院 | Method and equipment for configuring time domain detection position of physical downlink control channel |
| WO2020087982A1 (en) * | 2018-11-02 | 2020-05-07 | 华为技术有限公司 | Communication method and apparatus, and storage medium |
| WO2021120135A1 (en) * | 2019-12-19 | 2021-06-24 | 华为技术有限公司 | Resource determination method and resource determination apparatus |
| WO2021213296A1 (en) * | 2020-04-24 | 2021-10-28 | 展讯半导体(南京)有限公司 | Paging message monitoring method and system, electronic device, and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104754741B (en) | 2018-08-14 |
| WO2015101833A1 (en) | 2015-07-09 |
| TW201528748A (en) | 2015-07-16 |
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