CN103973425B - A kind of method of down control channel resources distribution - Google Patents
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Abstract
A kind of method of down control channel resources distribution, methods described includes：The corresponding numerical value A in position of orthogonal frequency division multiplex OFDM symbol is originated according to cross-carrier scheduling user UE1 Physical Downlink Shared Channel PDSCH, it is determined that control format indicates CFI initial value B in each subframe；The OFDM symbol number for the physical downlink control channel PDCCH occupancy that this carrier wave scheduling UE2 is used dynamically is adjusted by B.After the embodiment of the present invention, the PDCCH OFDM symbols taken can adaptively be adjusted.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method for allocating downlink control channel resources.
Background
In an advanced long term evolution (LTE-a) system supporting carrier aggregation, scheduling grant supports two transmission modes, i.e., local carrier scheduling and cross-carrier scheduling. The carrier Scheduling (SCC) is backward compatible with the REL-8/9 protocol, and the downlink allocation and uplink authorization of one carrier are scheduled by the Physical Downlink Control Channel (PDCCH) of the carrier. Cross carrier scheduling (CCC): the downlink allocation and uplink grant of one carrier may be scheduled by the PDCCH of the other carrier.
In the Rel-10 protocol, the primary carrier (PCC) must employ the present carrier scheduling. If one UE aggregates multiple carriers (CCs), cross-carrier scheduling may be employed on the SCC. A cross-carrier scheduled SCC, where the scheduling CC may be a PCC or other SCCs.
SCC of UE being scheduled by cross carrierxUplink reception of a Physical Downlink Shared Channel (PDSCH) first obtains two pieces of information, one is to indicate UE to be in SCCxThe Downlink Control Information (DCI) of the frequency domain resource location and Modulation and Coding Scheme (MCS) allocated on the PDSCH, and the other is the UE's Downlink Control Information (DCI) in the SCCxP ofDSCH starting symbol position information. Rel-10 is realized by adopting the following modes:
DCI information: the UE firstly monitors a Physical Control Format Indicator Channel (PCFICH) on the scheduling CC to obtain the number of symbols occupied by the PDCCH of the scheduling CC, and then performs blind detection on the PDCCH of the scheduling CC to obtain DCI information corresponding to the PDCCH on the SCCx.
PDSCH starting symbol position information on SCCx: and informing the UE through an RRC reconfiguration message.
After cross-carrier scheduling is adopted, the PDSCH resource of one CC may be scheduled by the CC or scheduled by other CCs. Therefore, on a downlink subframe of one CC, there may be both UEs scheduled by the present carrier and UEs scheduled by cross-carrier. Referring to the left diagram of fig. 1, UE1 employs cross-carrier scheduling, and the PDSCH starting symbol position on CC2 for UE1 is informed by RRC; the right diagram shows that the UE2 adopts the carrier scheduling, and the number of symbols occupied by the UE2 control information is obtained through the PCFICH.
The PDCCH adopted in the LTE-REL8/9 system occupies an Orthogonal Frequency Division Multiplexing (OFDM) symbol number dynamic adjustment algorithm, and the overhead of a PDCCH channel can be reduced as much as possible on the basis of meeting the requirements of the system on the PDCCH, so that the utilization rate of downlink resources of the system is improved.
The PDSCH initial symbol position of the cross-carrier scheduling UE is obtained through RRC information, the RRC information belongs to high-level signaling, and the PDSCH initial symbol position of the cross-carrier scheduling UE is obtained through the RRC information and cannot be timely sent to a corresponding subframe, so that the number of OFDM symbols occupied by the PDCCH cannot be timely and dynamically adjusted. Therefore, the algorithm for dynamically adjusting the number of OFDM symbols occupied by PDCCH in LTE-REL8/9 cannot be applied to an LTE-A system for scheduling cross-carrier scheduling users and local carrier scheduling on one PDSCH.
Disclosure of Invention
The embodiment of the invention provides a method for allocating downlink control channel resources, which is suitable for cross-carrier scheduling and can perform self-adaptive adjustment on OFDM symbols occupied by a PDCCH (physical Downlink control channel).
The technical scheme of the embodiment of the invention is as follows:
a method for allocating downlink control channel resources, the method comprising:
determining an initial value B of a control format indication CFI on each subframe according to a numerical value A corresponding to the position of a PDSCH (physical downlink shared channel) initial OFDM (orthogonal frequency division multiplexing) symbol of a cross-carrier scheduling user UE 1;
and B dynamically adjusts the number of OFDM symbols occupied by the PDCCH used by the carrier scheduling UE 2.
The determining an initial value B of the CFI on each subframe according to a value a corresponding to a position of a PDSCH starting OFDM symbol of the UE1 includes:
a is equal to the configurable minimum value of the OFDM symbol of the physical downlink control channel PDCCH, the position of the PDSCH starting OFDM symbol of the UE1 is the same as that of the PDSCH starting OFDM symbol of the UE 2;
system bandwidth >10, initial value B of CFI equals a at UE2 per subframe;
≦ 10, the initial value B of the CFI for the UE2 per subframe equals A-1.
The determining an initial value B of the CFI on each subframe according to a value a corresponding to a position of a PDSCH starting OFDM symbol of the UE1 includes:
a is not equal to the configurable minimum value of the OFDM symbol of PDCCH, the position of the PDSCH starting OFDM symbol of UE2 is one OFDM symbol earlier than the position of the PDSCH starting OFDM symbol of UE 1;
the initial value B of the CFI at each subframe of UE2 is equal to a-1.
The dynamically adjusting the number of OFDM symbols occupied by the PDCCH used by the UE2 in carrier scheduling by B includes:
determining a user set W needing to allocate PDCCH resources according to the available OFDM symbol number of the PDSCH of B, UE 2;
sequentially taking out users from W from high to low according to the scheduling priority, and determining that the users have available PDCCH resources;
determining a final CFI value C according to whether all users in W have available PDCCH resources and B;
10, the number of OFDM symbols occupied by PDCCH used by UE2 is equal to C;
≦ 10, the number of OFDM symbols occupied by the PDCCH used by the UE2 is equal to C + 1.
The determining that the user has available PDCCH resources comprises:
the PDCCH resources occupied by the user and the PDCCH resources occupied by other users do not have intersection;
and the starting point of the PDCCH resource occupied by the user and the terminal of the PDCCH resource occupied by the user both belong to the PDCCH resource to be distributed.
The determining C according to whether all users in W have available PDCCH resources and B includes:
all users in W have available PDCCH resources and B ═ the OFDM symbol configurable minimum of PDCCH, then C = B.
The determining C according to whether all users in W have available PDCCH resources and B includes:
and if all users in W have available PDCCH resources and B is not equal to the configurable minimum value of OFDM symbols of the PDCCH, updating B to be B-1, then sequentially taking out the users from W from high to low according to the scheduling priority, determining that each user in W has available PDCCH resources, and C = B-1.
The determining C according to whether all users in W have available PDCCH resources and B includes:
and if all users in W have available PDCCH resources and B is not equal to the configurable minimum value of OFDM symbols of the PDCCH, updating B to B-1, then sequentially taking out the users from W from high to low according to the scheduling priority, and if all the users in W do not have available PDCCH resources, C = B.
The determining C according to whether all users in W have available PDCCH resources and B includes:
if not all users in W have available PDCCH resources, then update B to B +1, and C = B + 1.
After the dynamic adjustment, the method further comprises the following steps:
recording the difference between the starting position of the PDSCH OFDM symbol of UE1 and the starting position of the PDSCH OFDM symbol of UE2 as N;
the number of users which can not allocate PDCCH resources is recorded as M;
after the timer T is overtime, if N is greater than Nthreshold and M is less than Mthreshold, the initial position of PDSCH OFDM symbol of UE1 is advanced by one OFDM symbol;
after the timer T is overtime, if N is less than or equal to Nthreshold and M is greater than or equal to Mthreshold, delaying the initial position of the PDSCH OFDM symbol of the UE1 by one OFDM symbol;
after the timer T is overtime, if N is greater than Nthreshold and M is greater than or equal to Mthreshold, restarting the timer T, and making N equal to 0 and M equal to 0;
after the timer T times out, if N is less than or equal to nth and M is less than Mthreshold, the timer T is restarted, so that N is equal to 0 and M is equal to 0.
The T and the Mthreshold are in a direct proportion relation; the T is in direct proportion to the Nthreshold.
When T is 1, nth is 1, and Mthreshold is equal to the product of the average number of scheduled users per subframe and the allowed user blocking probability.
As can be seen from the above technical solutions, in the embodiment of the present invention, an initial value B of a CFI on each subframe is determined according to a numerical value a corresponding to a position of a PDSCH starting OFDM symbol of a cross-carrier scheduling user UE 1; and then B dynamically adjusts the number of OFDM symbols occupied by PDCCH used by the carrier scheduling UE 2. According to the technical scheme, the method and the device can be suitable for cross-carrier scheduling, and adaptive adjustment of the OFDM symbols occupied by the PDCCH is achieved.
Drawings
Fig. 1 is a schematic diagram illustrating a CFI value determination method for a local carrier scheduling UE and a cross-carrier scheduling UE;
fig. 2 is a flowchart illustrating a method for allocating downlink control channel resources.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the invention, an initial value B of CFI on each subframe is determined according to a numerical value A corresponding to the position of a PDSCH initial OFDM symbol of a cross-carrier scheduling user UE 1; and then B dynamically adjusts the number of OFDM symbols occupied by PDCCH used by the carrier scheduling UE 2. Therefore, the method is suitable for cross-carrier scheduling and can perform adaptive adjustment on the OFDM symbols occupied by the PDCCH.
Referring to fig. 2, a schematic flow chart of a method for allocating downlink control channel resources specifically includes the following steps: the user scheduled for cross carrier is referred to as UE1 in the present invention, and the user scheduled locally is referred to as UE 2. The UE1 may include multiple users and the UE2 may include multiple users.
201. The value a corresponding to the position of the PDSCH starting OFDM symbol of the UE1 determines whether a is equal to a configurable minimum value of OFDM symbols of a Physical Downlink Control Channel (PDCCH).
The PDCCH occupies 1-4 OFDM symbols and includes a PDSCH occupying a plurality of OFDM symbols behind the PDCCH.
When there is both UE1 and UE2 on one PDSCH, it is first determined whether a is equal to the OFDM symbol configurable minimum value of PDCCH. According to the protocol specification, when a downlink subframe sends a PDCCH, if the system bandwidth is less than or equal to 10 resource blocks, the configurable minimum value of OFDM symbols is 2 OFDM symbols; if the system bandwidth is greater than or equal to 10 resource blocks, the minimum configurable value of the OFDM symbols is 1 OFDM symbol.
If a is equal to the configurable minimum value of the OFDM symbol of PDCCH, go to step 202; if a is not equal to the configurable minimum value of the OFDM symbols of PDCCH, step 203 is executed.
202. And determining an initial value B of the CFI according to the system bandwidth and the A.
Since the PDSCH starting symbol position of UE1 is the minimum desirable, the PDSCH starting symbol position of the present carrier scheduled UE2 cannot follow the PDSCH starting symbol position of the cross-carrier scheduled UE 1. Therefore, the PDSCH starting OFDM symbol of UE1 is the same position as the PDSCH starting OFDM symbol of UE 2.
System bandwidthThe initial value B of the CFI at each subframe of UE2 is equal to a;the initial value B of the CFI at each subframe of UE2 is equal to a-1.
203. B is determined by A.
To reduce the computational complexity of determining B, the position of the PDSCH starting OFDM symbol of UE2 is one OFDM symbol ahead of the position of the PDSCH starting OFDM symbol of UE 1. The initial value B of the CFI at each subframe of UE2 is equal to a-1.
204. And determining a user set W needing to be allocated with PDCCH resources according to the number of usable OFDM symbols of the PDSCH of B, UE 2.
And pre-allocating resources on a PDSCH and a PUSCH for the carrier scheduling user according to the scheduling priority from top to bottom according to the number of the OFDM symbols available for the PDSCH of the carrier scheduling user B and the carrier scheduling user, and the data volume and the broadband CQI value which need to be transmitted by the carrier scheduling user at this time, and further determining a user set W which needs to allocate the PDCCH resources. Wherein pre-allocation according to scheduling priority is prior art.
User in W uses W(i)Indicating that the queue W is ranked from high to low in scheduling priority (since one UE may transmit multiple DCIs on one subframe, there may be duplicate users in W).
205. And sequentially taking out the users from W from high to low according to the scheduling priority, and determining that the users have available PDCCH resources.
That is, the PDCCH resources occupied by the user and the PDCCH resources occupied by other users do not have intersection; and the starting point of the PDCCH resource occupied by the user and the terminal of the PDCCH resource occupied by the user both belong to the PDCCH resource to be distributed.
Specifically, the mathematical expression includes:
sequentially taking out users W from the queue W(i)Judging whether there is w in the system(i)Available PDCCH resources. If there is w(i)Available PDCCH resource, then w(i)And adding the user into a pre-scheduling queue S, or taking down one user until the users in W are polled.
Judgment of w(i)The method for joining the queue S is as follows:
if there is a point setSo that the following constraint holds, w(i)May be added to queue S, otherwise w(i)Queue S may not be joined.
Wherein,is shown in CCmThe initial position of the occupied Control Channel Element (CCE) resource,indicates its aggregation level, then w(i)Occupation of CCmCan be expressed as(CCE numbering starts from 0), prescheduling s in the queue(j)Occupation of CCmCCE resource ofWhereinIs s is(j)The aggregation level of (a).
206. And judging whether all users in the W have available PDCCH resources.
If all users in W have available PDCCH resources, execute 207; if all users in W have no available PDCCH resources, step 208 is performed.
207. And judging whether B is equal to the configurable minimum value of the OFDM symbols of the PDCCH.
B is equal to the configurable minimum value of OFDM symbols of PDCCH, go to step 209; b is not equal to the configurable minimum value of the OFDM symbols of PDCCH, step 210 is performed.
208. If not all users in W have available PDCCH resources, B is updated to B +1, and C is equal to B + 1.
209. All users in W have available PDCCH resources and B ═ the OFDM symbol configurable minimum of PDCCH, then C = B.
210. All users in W have available PDCCH resources, and B is not equal to the OFDM symbol configurable minimum value of PDCCH, update B to B-1, then judge that each user in W has available PDCCH resources, carry out step 211; otherwise, step 212 is performed.
211. All users in W have available PDCCH resources, then C = B-1.
212. Not every user in W has available PDCCH resources, C = B.
213. The number of OFDM symbols occupied by the PDCCH used by the UE2 is determined by the system bandwidth and C.
The number of OFDM symbols occupied by PDCCH used by UE2 is equal to C;the number of OFDM symbols occupied by the PDCCH used by UE2 is equal to C + 1.
214. And dynamically adjusting according to the timer T.
Recording the difference between the starting position of the PDSCH OFDM symbol of UE1 and the starting position of the PDSCH OFDM symbol of UE2 as N; the number of users that fail to allocate PDCCH resources is denoted as M.
After the timer T is over time, if N>NthresholdAnd M is<MthresholdThen the starting position of PDSCH OFDM symbol of UE1 is advanced by one OFDM symbol;
if N is less than or equal to N after the timer T is overtimethresholdAnd M is not less than MthresholdThen the starting position of PDSCH OFDM symbol of UE1 is delayed by one OFDM symbol;
after the timer T is over time, if N>NthresholdAnd M is not less than MthresholdIf yes, restarting the timer T, wherein N is 0, and M is 0;
if N is less than or equal to N after the timer T is overtimethresholdAnd M is<MthresholdThen, the timer T is restarted, N is equal to 0, and M is equal to 0.
T and MthresholdIs in a direct proportion relation; t and NthresholdIs proportional, and can be determined T, M according to specific conditions and the prior artthresholdAnd Nthreshold. For example: when T is 1, Nthreshold＝1，MthresholdEqual to the product of the average number of scheduled users per sub-frame and the allowed user blocking probability.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A method for allocating downlink control channel resources, the method comprising:
determining an initial value B of a control format indication CFI on each subframe according to a numerical value A corresponding to the position of a PDSCH (physical downlink shared channel) initial OFDM (orthogonal frequency division multiplexing) symbol of a cross-carrier scheduling user UE 1;
b, dynamically adjusting the number of OFDM symbols occupied by a physical downlink control channel PDCCH used by the carrier scheduling UE 2;
wherein the dynamically adjusting, by B, the number of OFDM symbols occupied by the PDCCH used by the UE2 in carrier scheduling includes:
determining a user set W needing to allocate PDCCH resources according to the available OFDM symbol number of the PDSCH of B, UE 2;
sequentially taking out users from W from high to low according to the scheduling priority, and determining that the users have available PDCCH resources;
determining a final CFI value C according to whether all users in W have available PDCCH resources and B;
if it isThen the number of OFDM symbols occupied by PDCCH used by UE2 is equal to C;
if it isThen the PDCCH used by UE2 occupies an OFDM symbol number equal to C + 1.
2. The method of claim 1, wherein the determining an initial value B of the CFI on each subframe according to a value a corresponding to a position of a PDSCH starting OFDM symbol of the UE1 comprises:
a is equal to the configurable minimum value of the OFDM symbol of the physical downlink control channel PDCCH, the position of the PDSCH starting OFDM symbol of the UE1 is the same as that of the PDSCH starting OFDM symbol of the UE 2;
system bandwidthThe initial value B of the CFI at each subframe of UE2 is equal to a;
the initial value of the CFI, B, at the UE2 per subframe is equal to A-1.
3. The method of claim 1, wherein the determining an initial value B of the CFI on each subframe according to a value a corresponding to a position of a PDSCH starting OFDM symbol of the UE1 comprises:
a is not equal to the configurable minimum value of the OFDM symbol of PDCCH, the position of the PDSCH starting OFDM symbol of UE2 is one OFDM symbol earlier than the position of the PDSCH starting OFDM symbol of UE 1;
the initial value B of the CFI at each subframe of UE2 is equal to a-1.
4. The method of claim 1, wherein the determining that the PDCCH resource available to the user comprises:
the PDCCH resources occupied by the user and the PDCCH resources occupied by other users do not have intersection;
and the starting point of the PDCCH resource occupied by the user and the terminal of the PDCCH resource occupied by the user both belong to the PDCCH resource to be distributed.
5. The method of claim 1, wherein the determining C according to whether all users in W have available PDCCH resources and B comprises:
all users in W have available PDCCH resources and B ═ PDCCH OFDM symbol configurable minimum, then C ═ B.
6. The method of claim 1, wherein the determining C according to whether all users in W have available PDCCH resources and B comprises:
and if all users in W have available PDCCH resources and B is not equal to the OFDM symbol configurable minimum value of the PDCCH, updating B to B-1, then sequentially taking out the users from W from high to low according to the scheduling priority, determining that each user in W has available PDCCH resources, and if C is equal to B-1.
7. The method of claim 1, wherein the determining C according to whether all users in W have available PDCCH resources and B comprises:
and if all users in W have available PDCCH resources and B is not equal to the minimum value configurable by the OFDM symbols of the PDCCH, updating B to B-1, then sequentially taking out the users from W from high to low according to the scheduling priority, and determining that not all the users in W have available PDCCH resources, and if C is equal to B.
8. The method of claim 1, wherein the determining C according to whether all users in W have available PDCCH resources and B comprises:
if not all users in W have available PDCCH resources, B is updated to B +1, and C is equal to B + 1.
9. The method of claim 1, wherein the dynamically adjusting further comprises:
recording the difference between the starting position of the PDSCH OFDM symbol of UE1 and the starting position of the PDSCH OFDM symbol of UE2 as N;
the number of users which can not allocate PDCCH resources is recorded as M;
after the timer T is over time, if N>NthresholdAnd M is<MthresholdThen the starting position of PDSCH OFDM symbol of UE1 is advanced by one OFDM symbol;
if N is less than or equal to N after the timer T is overtimethresholdAnd M is not less than MthresholdThen the starting position of PDSCH OFDM symbol of UE1 is delayed by one OFDM symbol;
after the timer T is over time, if N>NthresholdAnd M is not less than MthresholdIf yes, restarting the timer T, and enabling N to be 0 and M to be 0;
if N is less than or equal to N after the timer T is overtimethresholdAnd M is<MthresholdThen, the timer T is restarted, so that N is 0 and M is 0.
10. The method of claim 9, wherein the T and M arethresholdIs in a direct proportion relation; the T and NthresholdIs a direct proportional relationship.
11. The method of claim 9, wherein when T is 1, N isthreshold＝1，MthresholdEqual to the product of the average number of scheduled users per sub-frame and the allowed user blocking probability.
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| CN105578608B (en) * | 2015-12-23 | 2019-03-08 | 工业和信息化部电信研究院 | A kind of sending, receiving method and equipment of Downlink Control Information |
| CN106131963A (en) * | 2016-06-12 | 2016-11-16 | 珠海市魅族科技有限公司 | Resource allocation method and device, base station |
| US10863511B2 (en) * | 2018-04-10 | 2020-12-08 | FG Innovation Company Limited | Methods and related devices for performing cross-carrier scheduling with beam operations |
| CN111628852B (en) * | 2019-02-27 | 2021-11-19 | 大唐移动通信设备有限公司 | Resource allocation method and device |
| CN111918393B (en) * | 2019-05-09 | 2022-05-06 | 华为技术有限公司 | Transmission method of downlink data channel, communication device and computer storage medium |
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