CN103024908A - Method for self-adaptive adjustment on symbol occupation amount of PDCCH (Physical Downlink Control Channel) - Google Patents

Abstract

The invention provides a method for self-adaptive adjustment on symbol occupation amount of a PDCCH (Physical Downlink Control Channel). The method comprises the following steps of: A, periodically detecting the degree of satisfaction to cell service within a period of time; B, judging whether the degree of satisfaction to the cell service is lower than a first threshold, and if so, executing a step C, otherwise, returning back to execute the step A; C, calculating the occupation rate of cell bandwidth resources, judging whether the occupation rate of the cell bandwidth resources is lower than a second threshold, and if so, executing a step D, otherwise, executing a step E; D, increasing the symbol occupation amount of the PDCCH, and returning back to the step A; E, acquiring the quantity of current system users, and judging whether the user quantity is lower than a third threshold, and if so, executing a step F, otherwise, returning back to the step A; and F, reducing the symbol occupation amount of the PDCCH, and returning back to the step A.

Description

A kind of self adaptation is adjusted the method that PDCCH takies symbolic number

Technical field

The present invention relates to wireless communication technology field, relate in particular to a kind of self adaptation and adjust the method that Physical Downlink Control Channel (PDCCH) takies symbolic number.

Background technology

When UE carries out data traffic transmission, need to obtain the needed physical resource of up-downgoing transfer of data by the Downlink Control Information (DCI, Downlink Control Information) of Hashing algorithm blind check Physical Downlink Control Channel (PDCCH) on public and dedicated search space.The blind check process at first need to take by the PDCCH of Physical Control Format Indicator Channel (PCFICH) channel indication sign resources and PCFICH and physical mixing retransmission indicating chanel (PHICH, Physical Hybrid ARQ Indicator Channel) and take resource situation and calculate control channel particle (CCE) space size and terminal blind check original position ((RNTI) is relevant with Radio Network Temporary Identifier).The residential quarter is successfully established resource grains subgroup (REG) resource that rear PCFICH and PHICH take and fixes, so the sign resources that takies of PDCCH and the CCE quantity that can distribute have linear relationship.

Definite process that PDCCH of the prior art takies symbolic number comprises the steps: as shown in Figure 1

Step 101: obtain cell physical layer identifiers by cell search process;

Step 102: determine the actual resource location that takies of PCFICH channel;

Step 103: obtain the PHICH resource information by system information broadcast, and then the shared resource location of definite PHICH, system bandwidth, antenna port number;

After the resource distribution of step 104:PHICH is determined, by PDCCH channel resource number in the data indication decision systems of the PCFICH of static configuration in advance.

PCFICH channel indication PDCCH takies symbolic number, has determined that PDCCH and PDSCH take symbol space and divide.Pass through static configuration PCFICH value in the prior art, realize the control of PDCCH and PDSCH time-domain resource, because the uncertainty of system user number, number of services and business data transmission characteristic, this simple extensive resource dividing method can not adaptive system load and the dynamic change of traffic performance, cause the limited or Zone satisfaction of power system capacity to descend.

Summary of the invention

The invention provides a kind of self adaptation and adjust the method that PDCCH takies symbolic number, can realize rationally regulating PDCCH and take symbolic number, can improve the Zone satisfaction, improve power system capacity.

A kind of self adaptation that the embodiment of the invention provides is adjusted the method that PDCCH takies symbolic number, it is characterized in that, comprises the steps:

A, periodicity detect the satisfaction of Zone in a period of time;

B, judge whether the satisfaction of Zone is lower than the first threshold value, if, execution in step C, otherwise, execution in step A returned;

The occupancy of C, calculation plot bandwidth resources judges whether the occupancy of bandwidth of cell resource is lower than the second threshold value, if, execution in step D, otherwise execution in step E;

D, increase PDCCH take symbolic number, and return steps A;

E, obtain the number of users of current system, and judge whether number of users is lower than the 3rd threshold value, if, execution in step F, otherwise return steps A;

F, minimizing PDCCH take symbolic number and return steps A.

Preferably, steps A comprises:

A1, judge whether the sense cycle timer expired, if, execution in step A2, otherwise continue execution in step A1;

Professional i provides the satisfaction Sat (i, t) of service at current subframe t to network in the A2, calculation plot, and span is [0～1];

A3, judge whether i equals the current total professional number N of system _ServicesIf,, execution in step A4, otherwise, make i=i+1, and return steps A 2;

A4, according to formula $\mathrm{Sat}\left(\stackrel{\‾}{t}\right)=\frac{\underset{t=\stackrel{\‾}{t}-N_{\mathrm{TTI}}}{\overset{\stackrel{\‾}{t}}{\mathrm{\Σ}}}\underset{i=1}{\overset{N_{\mathrm{service}}}{\mathrm{\Σ}}}\mathrm{Sat}(i,t)}{N_{\mathrm{TTI}}*N_{\mathrm{service}}}*100\%$ The satisfaction of calculation plot business, wherein, N _TTIBe the duration with the sense cycle timer of number of sub frames metering.

Preferably, if professional i guarantees that for accumulative total is high bit rate type GBR is professional, then professional i provides the satisfaction Sat (i, t) of service to be professional actual transfer rate to network at current subframe t

GBR speed GBR with application _iRatio $\mathrm{Sat}(i,t)=\frac{\stackrel{\‾}{R}(i,t)}{{\mathrm{GBR}}_i}.$

Preferably, professional if professional i is non-GBR, then according to formula $\mathrm{Sat}(i,t)=\frac{\mathrm{Delay}\_{\mathrm{Timer}}_i-\mathrm{Timer}\_\mathrm{threshold}}{\mathrm{WT}(i,t)}$ Computing service i provides the satisfaction Sat (i, t) of service at current subframe t to network, wherein, and Delay_Timer _iFor controlling end to end delay requirement of control protocol layer by the Radio Link of grouped data time-delay budget PDB conversion corresponding to the quality of service class sign QCI grade of logic channel i, unit is millisecond; Timer_threshold is the time delay thresholding that non-GBR business allows at rlc layer, and unit is millisecond; WT (i, t) is that unit is millisecond by the at first stand-by period of the packet of arrival to the professional i of subframe t in descending.

Preferably, the occupancy of the described calculation plot bandwidth resources of step C is: according to formula $P_{t\_\mathrm{use}}=\frac{\underset{t=\stackrel{\‾}{t}-N_{\mathrm{TTI}}}{\overset{\stackrel{\‾}{t}}{\mathrm{\Σ}}}{N}_{i,d\_\mathrm{use}}}{N_{\mathrm{TTI}}*N_{d\_\mathrm{total}}}*100\%$ The occupancy of calculation plot bandwidth resources, wherein: N _{I, d_use}The stock number that represents i TTI scheduling; N _{D_total}The stock number that represents descending permission scheduling.

Preferably, the described increase of step D PDCCH takies before the step of symbolic number, further comprises: whether the PDCCH that judges current configuration takies symbol numbers is maximum, if then PDCCH is taken symbolic number and do not make an amendment, and return steps A; If not, carry out the step that described increase PDCCH takies symbolic number.

Preferably, the described increase of step D PDCCH takies symbolic number and is: the symbolic number that PDCCH is taken adds 1.

Preferably, described maximum is 4.

Preferably, the described minimizing of step F PDCCH takies before the step of symbolic number, further comprises: whether the PDCCH that judges current configuration takies symbol numbers is minimum value, if then PDCCH is taken symbolic number and do not make an amendment, and return steps A; If not, carry out the step that described minimizing PDCCH takies symbolic number.

Preferably, the described minimizing of step e PDCCH takies symbolic number and is: the symbolic number that PDCCH is taken subtracts 1.

Preferably, described minimum value is 1.

Occupancy and the number of users of current access of the present invention program by calculating the professional satisfaction of current area and scheduling resource comes self adaptation to adjust PDCCH to take symbolic number, and then improves the capacity of system and in the satisfaction of line service, realize system's self-optimizing.

Description of drawings

Fig. 1 determines in the prior art that PDCCH takies the schematic flow sheet of symbolic number;

Fig. 2 is that the present invention proposes the method flow schematic diagram that self adaptation adjustment PDCCH takies symbolic number.

Embodiment

The present invention program's basic thought is by the professional satisfaction of calculation plot and system bandwidth resources occupation rate, dynamically adjusts the PDCCH resource size.

The present invention proposes self adaptation and adjusts method flow that PDCCH takies symbolic number as shown in Figure 2, comprises the steps:

Step 201: the satisfaction that periodically detects Zone in a period of time.

Step 202: whether the satisfaction of judging Zone is lower than the first threshold value, if, execution in step 203, otherwise, execution in step 201 returned.

Step 203: the occupancy of calculation plot bandwidth resources.

Step 204: whether the occupancy of judging the bandwidth of cell resource is lower than the second threshold value, if (illustrative system does not take full advantage of schedulable system resource), execution in step 205, otherwise execution in step 206.

Step 205: adjust PDCCH and take symbolic number, increase schedulable professional number, and return step 201.

Step 206: the number of users that obtains current system, and judge whether number of users is lower than the 3rd threshold value, if (illustrate that current system major part or whole customer services belong to the high bit rate type (GBR that guarantees of accumulative total, Guaranteed Bit Rate) business), execution in step 207, otherwise return step 201.

Step 207: adjust PDCCH and take symbolic number, the Physical Downlink Shared Channel that increase can be dispatched (PDSCH) resource, and return step 201.

The above first threshold value and the second threshold value are the simulation parameter value, by the network optimization or planning personnel's configuration.The 3rd threshold value is relevant with the bandwidth of cell configuration, and value adopts the simulation parameter value under the concrete bandwidth, by the network optimization or planning personnel's configuration.

Such scheme has just provided and has adjusted the scheme that PDCCH takies symbolic number, the mode of distributing first PDCCH to take symbolic number is not limited.If distribute first PDCCH to take symbolic number, can adopt the default configuration parameter, by the network optimization or planning personnel's configuration.

The satisfaction method of the business that the present invention can realize by the scheduler module in the base station and statistical system bandwidth resources occupation rate, realize the adjustment of PDCCH resource dynamic, can Effective Raise improve satisfaction and system bandwidth resources occupation rate at line service, and have the low advantage of implementation complexity.

Clearer for the know-why, advantage and the technique effect that make technical solution of the present invention, below by specific embodiment the present invention program is further elaborated.

The embodiment of the invention one provides a kind of implementation of satisfaction of calculation plot access service.The residential quarter satisfaction is to the overall merit of residential quarter to each professional satisfaction, is the average of all professional satisfactions in a period of time, is that current system does not reach the most effective index to residential quarter access service Satisfaction index, is that the PDCCH resource is planned prerequisite again.The Zone satisfaction is the average of current all professional satisfactions in the residential quarter, and it is defined as follows:

$\mathrm{Sat}\left(\stackrel{\‾}{t}\right)=\frac{\underset{t=\stackrel{\‾}{t}-N_{\mathrm{TTI}}}{\overset{\stackrel{\‾}{t}}{\mathrm{\Σ}}}\underset{i=1}{\overset{N_{\mathrm{service}}}{\mathrm{\Σ}}}\mathrm{Sat}(i,t)}{N_{\mathrm{TTI}}*N_{\mathrm{service}}}*100\%---\left(1\right)$

Wherein, N _TTITime granularity (cycle) for the calculation plot satisfaction rate of number of sub frames metering comprises N _TTISubframe; N _ServicesBe the current total professional number of system; The professional i of Sat (i, t) expression provides the satisfaction of service at subframe t to network, and span is [0～1].

Below provide a kind of embodiment of step 201:

Step 201-1, judge whether the sense cycle timer expired, if, execution in step 201-2, otherwise continue execution in step 201-1;

Professional i provides the satisfaction Sat (i, t) of service at current subframe t to network in the step 201-2, calculation plot, and span is [0～1];

Step 201-3, judge whether i equals the current total professional number N of system _ServicesIf,, execution in step 201-4, otherwise, make i=i+1, and return step 201-2;

Step 201-4, according to the satisfaction of formula (1) calculation plot business, wherein, N _TTIBe the duration with the sense cycle timer of number of sub frames metering.

Professional i can have the various definitions mode at the satisfaction Sat of subframe t (i, t), below provides two examples:

Professional for GBR, professional i is obtained by the ratio of the GBR speed of professional actual transfer rate and application at the satisfaction Sat of subframe t (i, t):

$\mathrm{Sat}(i,t)=\frac{\stackrel{\‾}{R}(i,t)}{{\mathrm{GBR}}_i}---\left(2\right)$

Wherein:

Radio interface rate (unit is bits per second (bps)) for t moment logic channel i; GBR _iGBR for logic channel i.

Professional for non-GBR, by the ratio acquisition of professional QCI equivalent delay and propagation delay time:

$\mathrm{Sat}(i,t)=\frac{\mathrm{Delay}\_{\mathrm{Timer}}_i-\mathrm{Timer}\_\mathrm{threshold}}{\mathrm{WT}(i,t)}---\left(3\right)$

Wherein, Delay_Timer _iBe the quality of service class sign (QCI by logic channel i, QoS Class Identifier) grouped data time-delay budget (PDB corresponding to grade, Packet Delay Budget) Radio Link of conversion control control protocol (RLC, Radio Link Control) layer delay requirement end to end, unit be millisecond (ms); Timer_threshold is the time delay thresholding that non-GBR business allows at rlc layer, and unit is millisecond (ms); WT (i, t) is that unit is millisecond (ms) by the at first stand-by period of the packet of arrival to the professional i of subframe t in descending.

But the local resource occupancy refers to scheduling resource amounts of all professional uses of scheduling in a period of time and the ratio of descending scheduling resource, when the local resource occupancy hour, illustrate that current system also has the Deta bearer ability, but scheduler module can not be dispatched more business, therefore needs adjusting PDCCH to take symbol numbers and improves schedulable traffic carrying capacity; If system bandwidth resources occupation rate is larger, then obtain current online user number; If active user's number is fewer, it is professional to illustrate that then current access user great majority belong to high accumulative total GBR, then reduces the symbol numbers that PDCCH takies.

The embodiment of the invention provides a kind of definition of bandwidth of cell resources occupation rate, shown in formula (4):

$P_{t\_\mathrm{use}}=\frac{\underset{t=\stackrel{\‾}{t}-N_{\mathrm{TTI}}}{\overset{\stackrel{\‾}{t}}{\mathrm{\Σ}}}{N}_{i,d\_\mathrm{use}}}{N_{\mathrm{TTI}}*N_{d\_\mathrm{total}}}*100\%---\left(4\right)$

Wherein: N _{I, d_use}The stock number that represents i TTI scheduling; N _{D_total}The stock number of descending permission scheduling.

If system bandwidth resources occupation rate is lower than the second threshold value, whether the PDCCH that then further judges current configuration takies symbol numbers is maximum, if so, then PDCCH is taken symbolic number and does not make an amendment, and directly returns step 201; If not, then increase the number that PDCCH takies symbol, preferably, increase a symbol at every turn.The maximum that takies symbol with bandwidth related protocol regulation PDCCH is 4.

If system bandwidth resources occupation rate is greater than the second threshold value, then obtain current online user number, if active user's number is fewer, it is professional to illustrate that then current access user great majority belong to the high GBR of accumulative total, then further judge that current PDCCH takies symbolic number and whether reaches minimum value, if reach, then PDCCH is taken symbolic number and do not make an amendment, directly return step 201; If do not reach, then reduce the symbol numbers that PDCCH takies, preferably, reduce by a symbol at every turn.The minimum value that bandwidth related protocol regulation PDCCH takies symbol is 4.

Occupancy and the number of users of current access of the present invention by calculating the professional satisfaction of current area and scheduling resource comes self adaptation to adjust PDCCH to take symbolic number, and then improves the capacity of system and in the satisfaction of line service, realize system's self-optimizing.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (11)

1. a self adaptation is adjusted the method that physical downlink control channel PDCCH takies symbolic number, it is characterized in that, comprises the steps:

A, periodicity detect the satisfaction of Zone in a period of time;

B, judge whether the satisfaction of Zone is lower than the first threshold value, if, execution in step C, otherwise, execution in step A returned;

The occupancy of C, calculation plot bandwidth resources judges whether the occupancy of bandwidth of cell resource is lower than the second threshold value, if, execution in step D, otherwise execution in step E;

D, increase PDCCH take symbolic number, and return steps A;

E, obtain the number of users of current system, and judge whether number of users is lower than the 3rd threshold value, if, execution in step F, otherwise return steps A;

F, minimizing PDCCH take symbolic number and return steps A.

2. method according to claim 1 is characterized in that, steps A comprises:

A1, judge whether the sense cycle timer expired, if, execution in step A2, otherwise continue execution in step A1;

Professional i provides the satisfaction Sat (i, t) of service at current subframe t to network in the A2, calculation plot, and span is [0～1];

A3, judge whether i equals the current total professional number N of system _ServicesIf,, execution in step A4, otherwise, make i=i+1, and return steps A 2;

A4, according to formula $\mathrm{Sat}\left(\stackrel{\‾}{t}\right)=\frac{\underset{t=\stackrel{\‾}{t}-N_{\mathrm{TTI}}}{\overset{\stackrel{\‾}{t}}{\mathrm{\Σ}}}\underset{i=1}{\overset{N_{\mathrm{service}}}{\mathrm{\Σ}}}\mathrm{Sat}(i,t)}{N_{\mathrm{TTI}}*N_{\mathrm{service}}}*100\%$ The satisfaction of calculation plot business, wherein, N _TTIBe the duration with the sense cycle timer of number of sub frames metering.

3. method according to claim 2 is characterized in that, if professional i guarantees that for accumulative total is high bit rate type GBR is professional, then professional i provides the satisfaction Sat (i, t) of service to be professional actual transfer rate to network at current subframe t

GBR speed GBR with application _iRatio $\mathrm{Sat}(i,t)=\frac{\stackrel{\‾}{R}(i,t)}{{\mathrm{GBR}}_i}.$

4. method according to claim 2 is characterized in that, and is professional if professional i is non-GBR, then according to formula $\mathrm{Sat}(i,t)=\frac{\mathrm{Delay}\_{\mathrm{Timer}}_i-\mathrm{Timer}\_\mathrm{threshold}}{\mathrm{WT}(i,t)}$ Computing service i provides the satisfaction Sat (i, t) of service at current subframe t to network, wherein, and Delay_Timer _iFor controlling end to end delay requirement of control protocol layer by the Radio Link of grouped data time-delay budget PDB conversion corresponding to the quality of service class sign QCI grade of logic channel i, unit is millisecond; Timer_threshold is the time delay thresholding that non-GBR business allows at rlc layer, and unit is millisecond; WT (i, t) is that unit is millisecond by the at first stand-by period of the packet of arrival to the professional i of subframe t in descending.

5. method according to claim 2 is characterized in that, the occupancy of the described calculation plot bandwidth resources of step C is: according to formula $P_{t\_\mathrm{use}}=\frac{\underset{t=\stackrel{\‾}{t}-N_{\mathrm{TTI}}}{\overset{\stackrel{\‾}{t}}{\mathrm{\Σ}}}{N}_{i,d\_\mathrm{use}}}{N_{\mathrm{TTI}}*N_{d\_\mathrm{total}}}*100\%$ The occupancy of calculation plot bandwidth resources, wherein: N _{I, d_use}The stock number that represents i TTI scheduling; N _{D_total}The stock number that represents descending permission scheduling.

6. method according to claim 1 is characterized in that, the described increase of step D PDCCH takies before the step of symbolic number, further comprise: whether the PDCCH that judges current configuration takies symbol numbers is maximum, if then PDCCH is taken symbolic number and does not make an amendment, and return steps A; If not, carry out the step that described increase PDCCH takies symbolic number.

7. method according to claim 6 is characterized in that, the described increase of step D PDCCH takies symbolic number and is: the symbolic number that PDCCH is taken adds 1.

8. method according to claim 6 is characterized in that, described maximum is 4.

9. method according to claim 1 is characterized in that, the described minimizing of step F PDCCH takies before the step of symbolic number, further comprise: whether the PDCCH that judges current configuration takies symbol numbers is minimum value, if then PDCCH is taken symbolic number and does not make an amendment, and return steps A; If not, carry out the step that described minimizing PDCCH takies symbolic number.

10. method according to claim 9 is characterized in that, the described minimizing of step e PDCCH takies symbolic number and is: the symbolic number that PDCCH is taken subtracts 1.

11. method according to claim 10 is characterized in that, described minimum value is 1.

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