CN102868502B - A kind of method and device for adjusting physical downlink control channel polymerization - Google Patents
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Abstract
The invention discloses a kind of method and device for adjusting physical downlink control channel polymerization, methods described includes：According to the hybrid automatic repeat-request HARQ testing results of the user terminal received, control channel resource CCE outer shroud adjustment amount Δ CCE is determined；According to the Δ CCE, current CCE degree of polymerization L is adjustedCCE.The present invention can more accurately estimate that PDCCH transmission channel qualities are estimated, so as to its CCE degree of polymerization of adaptive adjustment, and then ensure that PDCCH transmission performance according to the DTX of detection；Optimize PDCCH resource utilization rate simultaneously, it is to avoid excessive waste.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for adjusting a degree of polymerization of a physical downlink control channel.
Background
In a 3GPP LTE (Long Term Evolution ) system, a base station selects and sends various DCI (downlink control Information) format types to a user according to a transmission mode of a UE (user equipment) and a transmission scheme, where the DCI format types are all carried in a PDCCH (physical downlink control channel) for transmission.
In a 10ms frame structure defined by LTE, a 1ms downlink subframe corresponds to one TTI (Transmission time interval), a PDCCH only occupies the first n OFDM (Orthogonal frequency division Multiplexing) symbols in a time domain, and a frequency domain removes a remaining frequency band occupied by the remaining channels, where the PDCCH mainly includes a reference signal, a Physical Format Indicator Channel (PCFICH), a Physical HARQ Indicator Channel (PHICH), and the like, where HARQ is Hybrid Automatic Repeat Request (Hybrid Automatic Repeat Request). Therefore, in each downlink subframe, only a limited number of reserved time-frequency resources are available for transmitting downlink control information, and this part is called a control field.
The minimum unit of PDCCH time-frequency Resource allocation is CCE (Control Channel Element, Control Channel Resource), and one CCE includes 9 REGs (Resource Element Group), that is, 36 REs (Resource Element). The PDCCHs all use QPSK (Quadrature Phase Shift Keying), and in order to provide different reliabilities by coding rates, the CCEs are allowed to have four polymerization degrees, 1, 2, 4, and 8 respectively.
The prior art discloses a method for determining the number of channel control blocks, which specifically comprises the following steps: determining the maximum bit number that each optional PDCCH can bear in a radio frame according to CQI (channel quality Indicator) information; determining the quality parameter of each PDCCH according to the determined maximum bit number which can be borne by each PDCCH and the data volume of the control signaling which needs to be transmitted currently; comparing the maximum quality parameter of the determined quality parameters of all PDCCHs with a threshold value, selecting one PDCCH from all selectable PDCCHs in a wireless frame according to the comparison result, and determining the number of control channel blocks corresponding to the selected PDCCH.
The prior art also discloses a method for allocating PDCCH resources, which specifically comprises the following steps: dividing PDCCH resources into a plurality of CCE sets; configuring a main CCE set and an auxiliary CCE set for a cell according to a plurality of CCE sets; and allocating the main CCE set resource to cell edge users and the auxiliary CCE set resource to cell center users.
Both the above two methods adopt the channel quality estimation of the traffic channel to control the channel quality of the PDCCH, thereby determining the corresponding CCE aggregation level. Therefore, the above method has the following disadvantages: the transmission mode of the traffic channel and the schemes such as power control are greatly different from those of the control channel, so that the quality of the traffic channel and the quality of the control channel may be greatly different, and thus, a large estimation deviation may exist when the quality of the control channel is estimated by directly using the channel quality information of the traffic channel. The consequence is that the corresponding CCE aggregation level is not properly selected, and the PDCCH has no combining gain for multiple transmissions, which affects the transmission performance of the PDCCH.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a device for adjusting the aggregation level of a physical downlink control channel, so as to solve the problem that the transmission performance of a PDCCH is affected due to inappropriate CCE aggregation level selection in the prior art.
In order to solve the above technical problem, in one aspect, the present invention provides a method for adjusting a degree of polymerization of a physical downlink control channel, where the method includes:
determining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to a received hybrid automatic repeat request HARQ detection result of a user terminal;
according to the delta CCE, adjusting the current CCE polymerization degree LCCE。
Further, when the HARQ detection result is the current CCE aggregation level L of the ueCCEDetermining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to feedback information about a physical downlink control channel PDCCH which discontinuously transmits DTX, which specifically comprises the following steps:
wherein the initial value of Δ CCE is 0; BLERt is a pre-configured target block error rate BLER value.
Further, when the HARQ detection result is the current CCE aggregation level L of the ueCCEDetermining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to feedback information about a physical downlink control channel PDCCH of an acknowledgement character ACK or a negative character NACK, which specifically comprises the following steps:
wherein the initial value of Δ CCE is 0; BLERtIs a pre-configured target block error rate BLER value.
Further, according to the delta CCE, adjusting the current CCE polymerization degree LCCEThe method specifically comprises the following steps:
when the delta CCE is larger than a preset CCE polymerization degree up-regulation threshold value Thr and is smaller than the maximum CCE polymerization degree of the user terminal, the current CCE polymerization degree L is adjustedCCEIs adjusted to LCCE× a, and making Δ CCE equal to 0, wherein a is a positive number greater than 1;
when the delta CCE is smaller than a preset CCE polymerization degree down-regulation threshold Thr1 and is larger than the minimum CCE polymerization degree of the user terminal, the current CCE polymerization degree L is adjustedCCEIs adjusted to LCCE× b, and making Delta CCE equal to 0, wherein b is a positive number less than 1;
when Thr1 is not less than delta CCE not less than Thr, the delta CCE is more than or equal to the maximum CCE polymerization degree of the user terminal or the delta CCE is less than or equal to the minimum CCE polymerization degree of the user terminal, keeping the current CCE polymerization degree LCCEAnd is not changed.
Further, Thr ═ f ″ (BLER)t)；0＜Thr1＜5。
On the other hand, the present invention also provides a device for adjusting the degree of polymerization of a physical downlink control channel, where the device includes:
an outer ring adjustment quantity determining unit, configured to determine an outer ring adjustment quantity Δ CCE for controlling a channel resource CCE according to a received HARQ detection result of a ue;
a CCE polymerization degree adjusting unit for adjusting the current CCE polymerization degree L according to the delta CCECCE。
Further, the outer-ring adjustment amount determination unit includes:
a first outer loop adjustment quantity determining subunit, configured to determine, when the HARQ detection result is that the ue has the current CCE aggregation level LCCEDetermining the feedback information about the physical downlink control channel PDCCH which discontinuously sends DTX when sending the feedback informationWherein the initial value of Δ CCE is 0;BLERt is a pre-configured target block error rate BLER value.
Further, the outer-ring adjustment amount determination unit includes:
a second outer loop adjustment quantity determining subunit, configured to determine, when the HARQ detection result is that the ue is at the current CCE aggregation level LCCEDetermining the feedback information about the physical downlink control channel PDCCH of the acknowledgement character ACK or the negative character NACK when sending down the feedback informationWherein the initial value of Δ CCE is 0;BLERt is a pre-configured target block error rate BLER value.
Further, the CCE aggregation degree adjusting unit includes:
an up-regulation subunit, configured to, when the Δ CCE is greater than a preset CCE aggregation level up-regulation threshold Thr and less than a maximum CCE aggregation level of the user terminal, regulate the current CCE aggregation level L to a level equal to or greater than the maximum CCE aggregation level of the user terminalCCEIs adjusted to LCCE× a, and making Δ CCE equal to 0, wherein a is a positive number greater than 1;
a down-regulation subunit, configured to, when the Δ CCE is smaller than a preset CCE aggregation level down-regulation threshold Thr1 and is greater than the minimum CCE aggregation level of the user terminal, regulate a current CCE aggregation level LCCEAdjustment ofIs LCCE× b, and making Delta CCE equal to 0, wherein b is a positive number less than 1;
a keeping subunit, configured to keep the current CCE aggregation level L when Thr1 is less than or equal to Δ CCE less than or equal to Thr, the Δ CCE is greater than or equal to the maximum CCE aggregation level of the user terminal, or the Δ CCE is less than or equal to the minimum CCE aggregation level of the user terminalCCEAnd is not changed.
Further, Thr ═ f ″ (BLER)t)；0＜Thr1＜5。
The invention has the following beneficial effects:
according to the invention, the quality of the PDCCH transmission channel can be more accurately estimated according to the detected DTX, so that the CCE polymerization degree can be adaptively adjusted, and the transmission performance of the PDCCH is ensured; meanwhile, the utilization rate of PDCCH resources is optimized, and excessive waste is avoided.
Drawings
Fig. 1 is a flowchart of a method for adjusting a degree of aggregation of a physical downlink control channel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for adjusting a degree of aggregation of a physical downlink control channel in an embodiment of the present invention.
Detailed Description
In order to solve the problem that the transmission performance of the PDCCH is affected due to inappropriate CCE aggregation level selection in the prior art, the present invention provides a method and an apparatus for adjusting the aggregation level of a physical downlink control channel, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The core idea of the method for adjusting the polymerization degree of the PDCCH is as follows: and performing step length accumulation type closed loop adjustment on the CCE polymerization degree level of the PDCCH according to the DTX state of PDCCH transmission detected by the base station.
As shown in fig. 1, an embodiment of the present invention relates to a method for adjusting a degree of aggregation of a physical downlink control channel, including:
step S101, determining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to a received hybrid automatic repeat request (HARQ) detection result of a user terminal;
in this step, each UE maintains a CCE outer loop adjustment amount Δ CCE; a step length of DTX adjustmentWherein, "DTX" means: discontinuous Transmission, Discontinuous Transmission; a non-DTX adjustment step"non-DTX" i.e., ACK (Acknowledgement character) or NACK (Negative Acknowledgement character) information; UE current latest CCE aggregation level: lx; UE temporary CCE aggregation level LCCE′。
When UE attach (initiate location registration procedure), initialize Δ CCE equal to 0, namely:are respectively BLERtThe function of (a), for example,x is any positive integer, can be taken as a value according to experience, and can also be set for a limited number of times to obtain an optimal value through adjustment;or,y is any positive integer, can be taken as a value according to experience, and can also be set for a limited number of times to obtain an optimal numerical value through adjustment. Wherein, BLERtThe value of the target BLER (block error rate) is configured in the background, and the value range is (0, 1). CCE aggregation level upper regulation threshold Thr ═ f ″ (BLER)t) Namely: thr is BLERtAs a function of (c). For example, Thr ═ BLERt× z, wherein z is any positive integer, can be taken empirically or set for a limited number of times, and is adjusted to obtain an optimal value, the CCE polymerization degree down-regulation threshold Thr1 is in a range of 0-5, i.e., 0 < Thr1 < 5.
When the HARQ detection result is that the user terminal has the current CCE polymerization degree LCCEDetermining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to feedback information about a physical downlink control channel PDCCH which discontinuously transmits DTX, which specifically comprises the following steps:
wherein the initial value of Δ CCE is 0; BLERtIs a pre-configured target block error rate (BLER) value;
when the HARQ detection result is that the user terminal has the current CCE polymerization degree LCCEDetermining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to feedback information about a physical downlink control channel PDCCH of an acknowledgement character ACK or a negative character NACK, which specifically comprises the following steps:
wherein the initial value of Δ CCE is 0; BLERtIs a pre-configured target block error rate (BLER) value;
step S102, according to the delta CCE, adjusting the current CCE polymerization degree LCCE。
In this step, when Δ CCE is greater than a preset CCE aggregation level up-regulation threshold Thr and less than the maximum CCE aggregation level of the user terminal, the current CCE aggregation level L is set to be equal to or greater than the maximum CCE aggregation level of the user terminalCCEIs adjusted to LCCE× a, and adjusting the Δ CCE to 0, i.e., Δ CCE equals 0, where a is a positive number greater than 1, e.g., a equals 2CCE′＝LCCE× a, then mixing LCCE' A value is assigned to LCCENamely: l isCCE＝LCCE′。
When the delta CCE is smaller than a preset CCE polymerization degree down-regulation threshold Thr1 and is larger than the minimum CCE polymerization degree of the user terminal, the current CCE polymerization degree L is adjustedCCEIs adjusted to LCCE× b, where b is a positive number less than 1, e.g., b is 0.5, and let L be 0CCE′＝LCCE× b, then mixing LCCE' A value is assigned to LCCENamely: l isCCE＝LCCE′。
When Thr1 is not less than delta CCE is not less than Thr, delta CCE is more than or equal to the maximum CCE polymerization degree of the user terminal or delta CCE is less than or equal to the minimum CCE polymerization degree of the user terminal, keeping the current CCE polymerization degree LCCEAnd is not changed.
The following is a detailed description of a specific example:
setting a UE to maintain a CCE outer ring adjustment quantity delta CCE; a step length of DTX adjustmentThe value is 0.5; one "non-DTX" (i.e., ACK or NACK information) adjustment step sizeUE current latest CCE aggregation level: l isCCE(ii) a UE temporary CCE aggregation level LCCE'. The received HARQ feedback information sequence is as follows: [ DTX ACK NACK]。
The adjustment amount calculation step is as follows:
step 1: after UE attach, the initialization Δ CCE is 0, and the background configuration target BLER value is 0.01, that is: BLERt＝0.01。 Adjusting threshold Thr ═ BLER on CCE polymerization degreet100 ═ 1. And adjusting the threshold Thr1 under the CCE polymerization degree, and taking the value as 0.5. UE current CCE aggregation level LCCEIs 2.
Step 2: when the HARQ detection result of the UE is received and the information is at the current CCE polymerization degree LCCEThe feedback of the PDCCH is sent down, and the adjustment value [ DTX ACK NACK ] is calculated according to the following HARQ sequence]：
The input is DTX:
since Δ CCE is equal to the threshold Thr and greater than Thr1, then LCCE′LCCEAnd L isCCE＝2；
The input is ACK:
since Δ CCE is less than the threshold Thr and greater than Thr1, then LCCE′LCCEAnd L isCCE＝LCCE′＝2；
The input is NACK:
since Δ CCE is less than the threshold Thr and greater than Thr1, then LCCE′LCCEAnd L isCCE＝LCCE′＝2；
The input is DTX:
since Δ CCE is greater than the threshold Thr, then LCCE′LCCE× 2, and LCCE＝LCCE' -4; let Δ CCE equal to 0;
the input is DTX:
since Δ CCE is equal to the threshold Thr and greater than Thr1, then LCCE′LCCEAnd L isCCE＝4；
The input is ACK:
since Δ CCE is less than the threshold Thr and greater than Thr1, then LCCE′LCCEAnd L isCCE＝LCCE′＝4；
The input is NACK:
since Δ CCE is less than the threshold Thr and greater than Thr1, then LCCE′LCCEAnd L isCCE＝LCCE′＝4。
As shown in fig. 2, an embodiment of the present invention further relates to a device for adjusting a degree of polymerization of a physical downlink control channel, which implements the method described above, and includes:
an outer-loop adjustment amount determining unit 201, configured to determine an outer-loop adjustment amount Δ CCE of a control channel resource CCE according to a received HARQ detection result of a ue;
a CCE aggregation level adjusting unit 202 configured to adjust the current CCE aggregation level L according to Δ CCECCE。
Wherein the outer loop adjustment amount determining unit includes:
a first outer loop adjustment amount determining subunit 2021, configured to determine, when the HARQ detection result is the current CCE aggregation level L at the ueCCEWhen the feedback information about the physical downlink control channel PDCCH which discontinuously sends DTX is sent, the feedback information is determinedWherein the initial value of Δ CCE is 0;namely, it isIs BLERtFunction of (BLER)tIs a pre-configured target block error rate BLER value.
A second outer loop adjustment amount determining subunit 2022, configured to determine, when the HARQ detection result is the current CCE aggregation at the ueDegree of contact LCCEWhen the feedback information about the physical downlink control channel PDCCH of the acknowledgement character ACK or the negative character NACK is issued, the determination is carried outWherein the initial value of Δ CCE is 0;namely, it isIs BLERtFunction of (BLER)tIs a pre-configured target block error rate BLER value.
The CCE aggregation degree adjusting unit 202 includes:
an up-regulation subunit 2021, configured to, when Δ CCE is greater than the preset CCE aggregation level up-regulation threshold Thr and is less than the maximum CCE aggregation level of the ue, adjust the current CCE aggregation level LCCEIs adjusted to LCCE× a, and making Δ CCE equal to 0, wherein a is a positive number greater than 1;
a down-regulation subunit 2022, configured to, when Δ CCE is smaller than a preset CCE aggregation level down-regulation threshold Thr1 and is greater than the minimum CCE aggregation level of the user terminal, regulate a current CCE aggregation level LCCEIs adjusted to LCCE× b, and making Delta CCE equal to 0, wherein b is a positive number less than 1;
a keeping subunit 2023, configured to keep the current CCE aggregation level L when Thr1 is not less than Δ CCE not more than Thr, Δ CCE is greater than or equal to the maximum CCE aggregation level of the user terminal, or Δ CCE is less than or equal to the minimum CCE aggregation level of the user terminalCCEAnd is not changed.
Wherein Thr ═ f ″ (BLER)t) Namely: thr is BLERtFor example, z is any positive integer, which can be taken empirically or set for a limited number of times, and an optimal value is obtained by adjustment, and the CCE polymerization degree down-regulation threshold Thr1 is in a range of 0 to 5, that is, 0 < Thr1 < 5.
According to the embodiment, the quality of the PDCCH transmission channel can be more accurately estimated according to the detected DTX, so that the CCE polymerization degree can be adaptively adjusted, and the transmission performance of the PDCCH is ensured; meanwhile, the utilization rate of PDCCH resources is optimized, and excessive waste is avoided.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (6)
1. A method for adjusting physical downlink control channel polymerization degree is characterized in that the method comprises the following steps:
determining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to a received hybrid automatic repeat request HARQ detection result of a user terminal;
according to the delta CCE, adjusting the current CCE polymerization degree LCCE；
When the HARQ detection result is that the user terminal has the current CCE polymerization degree LCCEMethod for sending physical downlink control channel PDCCH related to discontinuous transmission DTXFeedback information, determining an outer-loop adjustment quantity Δ CCE of a control channel resource CCE, specifically:
is BLERtA function of (a);
wherein the initial value of Δ CCE is 0; BLERtIs a pre-configured target block error rate (BLER) value;
adjusting the current CCE polymerization degree L according to the delta CCECCEThe method specifically comprises the following steps:
when the delta CCE is larger than a preset CCE polymerization degree up-regulation threshold value Thr and is smaller than the maximum CCE polymerization degree of the user terminal, the current CCE polymerization degree L is adjustedCCEIs adjusted to LCCE× a, and making Δ CCE equal to 0, wherein a is a positive number greater than 1;
when the delta CCE is smaller than a preset CCE polymerization degree down-regulation threshold Thr1 and is larger than the minimum CCE polymerization degree of the user terminal, the current CCE polymerization degree L is adjustedCCEIs adjusted to LCCE× b, and making Delta CCE equal to 0, wherein b is a positive number less than 1;
when Thr1 is not less than delta CCE not less than Thr, the delta CCE is more than or equal to the maximum CCE polymerization degree of the user terminal or the delta CCE is less than or equal to the minimum CCE polymerization degree of the user terminal, keeping the current CCE polymerization degree LCCEAnd is not changed.
2. The method of claim 1, wherein alternatively, when the HARQ detection result is the current CCE aggregation level L of the ue, the method of adjusting the pdcch aggregation level is characterized in thatCCEDetermining an outer ring adjustment quantity delta CCE of a control channel resource CCE according to feedback information about a physical downlink control channel PDCCH of an acknowledgement character ACK or a negative character NACK, which specifically comprises the following steps:
is BLERtA function of (a);
wherein the initial value of Δ CCE is 0; BLERtIs a pre-configured target block error rate BLER value.
3. The method for adjusting the degree of aggregation of physical downlink control channel according to claim 1, wherein Thr is BLERtA function of (a); 0 < Thr1 < 5.
4. An apparatus for adjusting a degree of aggregation of a physical downlink control channel, the apparatus comprising:
an outer ring adjustment quantity determining unit, configured to determine an outer ring adjustment quantity Δ CCE for controlling a channel resource CCE according to a received HARQ detection result of a ue;
a CCE polymerization degree adjusting unit for adjusting the current CCE polymerization degree L according to the delta CCECCE；
The outer loop adjustment amount determination unit includes:
a first outer loop adjustment quantity determining subunit, configured to determine, when the HARQ detection result is that the ue has the current CCE aggregation level LCCEDetermining the feedback information about the physical downlink control channel PDCCH which discontinuously sends DTX when sending the feedback informationWherein the initial value of Δ CCE is 0;is BLERtA function of (a); BLERtIs a pre-configured target block error rate (BLER) value;
the CCE polymerization degree adjustment unit includes:
a tuner subunit for tuning the frequency of the signalWhen the delta CCE is larger than the preset CCE polymerization degree up-regulation threshold value Thr and is smaller than the maximum CCE polymerization degree of the user terminal, the current CCE polymerization degree L is adjustedCCEIs adjusted to LCCE× a, and making Δ CCE equal to 0, wherein a is a positive number greater than 1;
a down-regulation subunit, configured to, when the Δ CCE is smaller than a preset CCE aggregation level down-regulation threshold Thr1 and is greater than the minimum CCE aggregation level of the user terminal, regulate a current CCE aggregation level LCCEIs adjusted to LCCE× b, and making Delta CCE equal to 0, wherein b is a positive number less than 1;
a keeping subunit, configured to keep the current CCE aggregation level L when Thr1 is less than or equal to Δ CCE less than or equal to Thr, the Δ CCE is greater than or equal to the maximum CCE aggregation level of the user terminal, or the Δ CCE is less than or equal to the minimum CCE aggregation level of the user terminalCCEAnd is not changed.
5. The apparatus for adjusting the aggregation level of a physical downlink control channel according to claim 4, wherein the outer loop adjustment amount determining unit includes:
a second outer loop adjustment quantity determining subunit, configured to determine, when the HARQ detection result is that the ue is at the current CCE aggregation level LCCEDetermining the feedback information about the physical downlink control channel PDCCH of the acknowledgement character ACK or the negative character NACK when sending down the feedback informationWherein the initial value of Δ CCE is 0;is BLERtA function of (a); BLERtIs a pre-configured target block error rate BLER value.
6. The apparatus for adjusting the degree of aggregation of Physical Downlink Control Channel (PDCCH) according to claim 4, wherein Thr is BLERtA function of (a); 0 < Thr1 < 5.
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| CN105101104B (en) * | 2014-04-18 | 2019-01-01 | 成都鼎桥通信技术有限公司 | Method, base station and the monitor terminal of CCE aggregation levels are adjusted in group service |
| CN104038331B (en) * | 2014-06-27 | 2017-07-28 | 华为技术有限公司 | The aggregation level method of adjustment of control channel and base station |
| CN104125645B (en) * | 2014-07-18 | 2017-11-28 | 大唐移动通信设备有限公司 | A kind of control channel unit polymerization grade determines method and device |
| CN108156663A (en) * | 2017-12-25 | 2018-06-12 | 西安科技大学 | A kind of method for improving control channel resource allocation in LTE |
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