CN103369610A - Self-adaptive setting method and device for CRE bias - Google Patents
Self-adaptive setting method and device for CRE bias Download PDFInfo
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- CN103369610A CN103369610A CN2012100829970A CN201210082997A CN103369610A CN 103369610 A CN103369610 A CN 103369610A CN 2012100829970 A CN2012100829970 A CN 2012100829970A CN 201210082997 A CN201210082997 A CN 201210082997A CN 103369610 A CN103369610 A CN 103369610A
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- 230000006978 adaptation Effects 0.000 claims description 11
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a self-adaptive setting method and device for a CRE bias. The method and device are used for setting the CRE bias in a switch from a macro cell to a cell of low power; S1: carrying out a statistics of a signal to interference and noise ratio (SINR) of boundary users in the cell of low power under the current CRE bias; S2: judging whether the SINR of all the boundary users of the cell of low power is larger than a preset threshold value SINRth, if yes, adopting the current CRE bias and ending the setting process, if no, executing the S3; and S3: subtracting an adjustment step length delta 2 from the current CRE bias value and then an updated current CRE bias is obtained, and then turning to the S1. The self-adaptive setting method and device for the CRE bias ensures expansion of equivalent coverage area of Pico Cells while trying to ensure channel quality for the boundary users to the greatest extent.
Description
[technical field]
The present invention relates to wireless communication technology field, particularly self adaptation method to set up and the device of biasing switched in a kind of residential quarter.
[background technology]
In order to improve mobile network's coverage, in Long Term Evolution (LTE) system except macrocell, also introduced the low power nodes such as femto base station (Pico eNB), form Pico cell residential quarter (Pico Cell), cover with the focus in the professional and enhancing among a small circle in the unloading macrocell, thereby consisted of heterogeneous network.The very little honeycomb that these Pico Cell normally arrange between building has further wide application prospect.
Under above-mentioned macrocell and applied environment that Pico Cell combines, although expanded coverage, can relate to portable terminal between macrocell and Pico Cell switching problem and the problem of co-channel interference between the residential quarter.Existing residential quarter is switched the residential quarter switching biasing (CRE Bias) of using and is that fixed value, the difference in signal strength between the residential quarter reach this CRE Bias, and then triggering mobile terminals is carried out the residential quarter switching.Yet the setting of CRE Bias tends to the degree that is disturbed of cell boundary users is exerted an influence, if the fixed value that CREBias arranges can guarantee to expand to greatest extent the equivalent coverage of Pico Cell, the better load of unloading macrocell, then can for boundary user brings larger co-channel interference, can't guarantee the channel quality of boundary user.
[summary of the invention]
In view of this, the invention provides self adaptation method to set up and the device of a kind of CRE Bias, so that when guaranteeing the equivalent coverage of expansion Pico Cell, guarantee the channel quality of boundary user as far as possible.
Concrete technical scheme is as follows:
The self adaptation method to set up that biasing is switched in a kind of residential quarter is used for the residential quarter switching biasing that switches to low power cell from macrocell is set, and the method comprises:
S1, statistics current area are switched under the bias condition, and the signal of described low power cell boundary user and interference add signal to noise ratio SINR;
S2, judge that the SINR of all described low power cell boundary users is whether greater than default threshold value SINR
Th, if so, adopt current area to switch biasing, finish setting procedure; Otherwise, execution in step S3;
S3, the value that the current area switching is setovered deduct the adjustment step delta
2Switch biasing as the current area after upgrading, go to described step S1.
According to one preferred embodiment of the present invention, before described step S1, also comprise:
A1, statistics are switched biasing CRE at initial cell
0Under the condition, the resource occupation situation ρ of described low power cell
0
The ρ that A2, judgement count on
0Whether less than default resource occupation condition threshold ρ
Th, if so, execution in step A3; Otherwise, adopt CRE
0Switch biasing as current area, finish setting procedure;
A3, the value that the current area switching is setovered add the adjustment step delta
1Switch biasing, wherein 0＜Δ as the current area after upgrading
2＜Δ
1
According to one preferred embodiment of the present invention, described resource occupation situation comprises: resource occupation number or resources occupation rate.
According to one preferred embodiment of the present invention, if the difference of the signal strength signal intensity of the signal strength signal intensity of the described low power cell that the user receives and described macrocell is less than or equal to preset strength difference limen value, then determine that the user is described low power cell boundary user.
According to one preferred embodiment of the present invention, described low power cell is Pico cell residential quarter Pico Cell or Micro-cell Microcell.
The self adaptation setting device that biasing is switched in a kind of residential quarter is used for the residential quarter switching biasing that switches to low power cell from macrocell is set, and this device comprises:
The Signal to Interference plus Noise Ratio statistic unit is used for the statistics current area and switches under the bias condition, and the signal of described low power cell boundary user and interference add signal to noise ratio SINR;
The Signal to Interference plus Noise Ratio judging unit is used for judging that whether the SINR of all described low power cell boundary users is greater than default threshold value SINR
Th, if so, adopt current area to switch biasing, otherwise, the step-length adjustment unit triggered;
The step-length adjustment unit, after being used for being subject to the triggering of described Signal to Interference plus Noise Ratio judging unit, the value of current area being switched biasing deducts the adjustment step delta
2Switch biasing as the current area after upgrading, trigger described Signal to Interference plus Noise Ratio statistic unit.
According to one preferred embodiment of the present invention, this device also comprises:
The resource occupation statistic unit is used for statistics and switches biasing CRE at initial cell
0Under the condition, the resource occupation situation ρ of described low power cell
0
The resource occupation judging unit is used for judging the ρ that counts on
0Whether less than default resource occupation condition threshold ρ
Th, if so, trigger described step-length adjustment unit; Otherwise, adopt CRE
0Switch biasing as current area;
Described step-length adjustment unit, after being used for being subject to the triggering of described resource occupation judging unit, the value of current area being switched biasing adds the adjustment step delta
1Switch biasing, wherein 0＜Δ as the current area after upgrading
2＜Δ
1
According to one preferred embodiment of the present invention, described resource occupation situation comprises: resource occupation number or resources occupation rate.
According to one preferred embodiment of the present invention, this device also comprises:
The boundary user determining unit is less than or equal to preset strength difference limen value if be used for the difference of the signal strength signal intensity of the signal strength signal intensity of the described low power cell that the user receives and described macrocell, then determines that the user is described low power cell boundary user.
According to one preferred embodiment of the present invention, described low power cell is Pico cell residential quarter Pico Cell or Micro-cell Microcell.
As can be seen from the above technical solutions, the present invention passes through to judge that whether the SINR of all boundary users of low power cell is greater than default threshold value SINR
Th, progressively adjust the residential quarter and switch biasing, until the SINR of all boundary users of low power cell is all greater than SINR
Th, guarantee that namely the co-channel interference of all boundary users in tolerance interval, has more excellent channel quality.
[description of drawings]
Fig. 1 switches the self adaptation method to set up flow chart of biasing for the residential quarter that the embodiment of the invention one provides;
Fig. 2 switches the self adaptation setting device structure chart of biasing for the residential quarter that the embodiment of the invention two provides.
[embodiment]
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Embodiment one,
Fig. 1 switches the self adaptation method to set up flow chart of biasing for the residential quarter that the embodiment of the invention one provides, and this embodiment user arranges the residential quarter switching biasing that switches to Pico Cell residential quarter from macrocell, and as shown in Figure 1, the method may further comprise the steps:
Step 101: statistics is switched biasing CRE at initial cell
0The resource occupation situation ρ of Pico Cell under the condition
0
The resource occupation situation that relates in this step can include but not limited to: resource occupation number or resources occupation rate.
Step 102: judge the ρ that counts on
0Whether less than default resource occupation condition threshold ρ
Th, if so, execution in step 103; Otherwise, adopt CRE
0Switch biasing as current area, finish setting procedure.
Wherein, resource occupation condition threshold ρ
ThA threshold value arranging according to network condition of operator normally, purpose be for the load state that guarantees Pico Cell in normal or preferable range.
Step 103: the value of current area being switched biasing adds that is adjusted a step delta
1Switch biasing as the current area after upgrading.
Adjust step delta
1Can be set according to network condition by operator.
Step 104: switch under the bias condition residential quarter after statistics is upgraded, and the signal of Pico Cell boundary user and interference add signal to noise ratio (SINR).
SINR refers to the ratio of user the useful signal intensity that receives and the interference signal intensity that receives.User's SINR reports by measurement and obtains, and user's terminal periodic ground carries out the measurement of SINR, then reports to eNB (being Pico eNB in Pico Cell).
Difference between the signal strength signal intensity of the Pico Cell that boundary user can receive according to the user and the signal strength signal intensity of macrocell is judged, if the difference of the signal strength signal intensity of the Pico Cell that the user receives and the signal strength signal intensity of macrocell is less than or equal to preset strength difference limen value, think that then this user is Pico Cell boundary user, wherein preset strength difference limen value can adopt empirical value, for example 3dB.
Step 105: judge that whether the SINR of all Pico Cell boundary users is greater than default threshold value SINR
Th, if so, adopt current area to switch biasing, finish setting procedure; Otherwise, execution in step 106.
SINR wherein
ThBe the minimum SINR that the user can proper communication, set by the equipment manufacturers of terminal that the user uses.If the SINR of all Pico Cell boundary users all can proper communication, illustrate that then channel quality meets the demands, can finish the setting that biasing is switched in the residential quarter; Otherwise it is excessive that the step-length that residential quarter switching biasing is described is adjusted, and therefore continues execution in step 106.
Step 106: the value of current area being switched biasing deducts an adjustment step delta
2Switch biasing as the current area after upgrading, go to step 104.
Wherein, 0＜Δ
2＜Δ
1, Δ for example
2Can for
Above-described embodiment one described method, executive agent is the eNB among the Pico Cell.Need to prove, embodiment one is to switch to the description that Pico Cell carries out as example from macrocell, but said method is equally applicable to switch to such as other low power cell such as Micro-cells (Microcell) from macrocell, and executive agent is exactly the eNB in other low power nodes so.
More than be the detailed description that device provided by the present invention is carried out, be described in detail below in conjunction with two pairs of devices provided by the present invention of embodiment.
Embodiment two,
Fig. 2 switches the self adaptation setting device structure chart of biasing for the residential quarter that the embodiment of the invention two provides, this device is used for arranging the residential quarter switching biasing that switches to low power cell from macrocell, as described in Figure 2, this device comprises: resource occupation statistic unit 201, resource occupation judging unit 202, step-length adjustment unit 203, Signal to Interference plus Noise Ratio statistic unit 204 and Signal to Interference plus Noise Ratio judging unit 205.
Resource occupation statistic unit 201 is used for statistics and switches biasing CRE at initial cell
0Under the condition, the resource occupation situation ρ of low power cell
0
Wherein, the resource occupation situation that relates to can include but not limited to: resource occupation number or resources occupation rate.
Resource occupation judging unit 202 is used for judging the ρ that counts on
0Whether less than default resource occupation condition threshold ρ
Th, if so, trigger step-length adjustment unit 203; Otherwise, adopt CRE
0Switch biasing as current area.
Wherein, resource occupation condition threshold ρ
ThA threshold value arranging according to network condition of operator normally, purpose be for the load state that guarantees Pico Cell in normal or preferable range.
Step-length adjustment unit 203, after being used for being subject to the triggering of resource occupation judging unit 202, the value of current area being switched biasing adds the adjustment step delta
1Switch biasing as the current area after upgrading.Adjust step delta
1Can be set according to network condition by operator.
Signal to Interference plus Noise Ratio statistic unit 204 is used for the statistics current area and switches under the bias condition SINR of low power cell boundary user.
SINR refers to the ratio of user the useful signal intensity that receives and the interference signal intensity that receives.User's SINR reports by measurement and obtains, and user's terminal periodic ground carries out the measurement of SINR, then reports to eNB (being Pico eNB in Pico Cell).
Signal to Interference plus Noise Ratio judging unit 205 is used for judging that whether the SINR of all low power cell boundary users is greater than default threshold value SINR
Th, if so, adopt current area to switch biasing, otherwise, step-length adjustment unit 203 triggered.
SINR wherein
ThBe the minimum SINR that the user can proper communication, set by the equipment manufacturers of terminal that the user uses.If the SINR of all Pico Cell boundary users all can proper communication, illustrate that then channel quality meets the demands.
Step-length adjustment unit 203, after being used for being subject to the triggering of Signal to Interference plus Noise Ratio judging unit, the value of current area being switched biasing deducts the adjustment step delta
2Switch biasing as the current area after upgrading, trigger the Signal to Interference plus Noise Ratio statistic unit, wherein 0＜Δ
2＜Δ
1
In order to help Signal to Interference plus Noise Ratio judging unit 205 to determine boundary user, this device can also comprise:
Boundary user determining unit 206 is less than or equal to preset strength difference limen value if be used for the difference of the signal strength signal intensity of the signal strength signal intensity of the low power cell that the user receives and macrocell, then determines that the user is the low power cell boundary user.
The related low power cell of the present embodiment can include but not limited to Pico Cell or Microcell.The device that embodiment two provides can be arranged among the eNB of low power cell.
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 (10)
1. the self adaptation method to set up of biasing is switched in a residential quarter, is used for the residential quarter switching biasing that switches to low power cell from macrocell is set, and it is characterized in that, the method comprises:
S1, statistics current area are switched under the bias condition, and the signal of described low power cell boundary user and interference add signal to noise ratio SINR;
S2, judge that the SINR of all described low power cell boundary users is whether greater than default threshold value SINR
Th, if so, adopt current area to switch biasing, finish setting procedure; Otherwise, execution in step S3;
S3, the value that the current area switching is setovered deduct the adjustment step delta
2Switch biasing as the current area after upgrading, go to described step S1.
2. method according to claim 1 is characterized in that, also comprises before described step S1:
A1, statistics are switched biasing CRE at initial cell
0Under the condition, the resource occupation situation ρ of described low power cell
0
The ρ that A2, judgement count on
0Whether less than default resource occupation condition threshold ρ
Th, if so, execution in step A3; Otherwise, adopt CRE
0Switch biasing as current area, finish setting procedure;
A3, the value that the current area switching is setovered add the adjustment step delta
1Switch biasing, wherein 0＜Δ as the current area after upgrading
2＜Δ
1
3. method according to claim 2 is characterized in that, described resource occupation situation comprises: resource occupation number or resources occupation rate.
4. method according to claim 1, it is characterized in that, if the difference of the signal strength signal intensity of the described low power cell that the user receives and the signal strength signal intensity of described macrocell is less than or equal to preset strength difference limen value, then determine that the user is described low power cell boundary user.
5. according to claim 1 to the described method of 4 arbitrary claims, it is characterized in that, described low power cell is Pico cell residential quarter Pico Cell or Micro-cell Microcell.
6. the self adaptation setting device of biasing is switched in a residential quarter, is used for the residential quarter switching biasing that switches to low power cell from macrocell is set, and it is characterized in that, this device comprises:
The Signal to Interference plus Noise Ratio statistic unit is used for the statistics current area and switches under the bias condition, and the signal of described low power cell boundary user and interference add signal to noise ratio SINR;
The Signal to Interference plus Noise Ratio judging unit is used for judging that whether the SINR of all described low power cell boundary users is greater than default threshold value SINR
Th, if so, adopt current area to switch biasing, otherwise, the step-length adjustment unit triggered;
The step-length adjustment unit, after being used for being subject to the triggering of described Signal to Interference plus Noise Ratio judging unit, the value of current area being switched biasing deducts the adjustment step delta
2Switch biasing as the current area after upgrading, trigger described Signal to Interference plus Noise Ratio statistic unit.
7. device according to claim 6 is characterized in that, this device also comprises:
The resource occupation statistic unit is used for statistics and switches biasing CRE at initial cell
0Under the condition, the resource occupation situation ρ of described low power cell
0
The resource occupation judging unit is used for judging the ρ that counts on
0Whether less than default resource occupation condition threshold ρ
Th, if so, trigger described step-length adjustment unit; Otherwise, adopt CRE
0Switch biasing as current area;
Described step-length adjustment unit, after being used for being subject to the triggering of described resource occupation judging unit, the value of current area being switched biasing adds the adjustment step delta
1Switch biasing, wherein 0＜Δ as the current area after upgrading
2＜Δ
1
8. device according to claim 7 is characterized in that, described resource occupation situation comprises: resource occupation number or resources occupation rate.
9. device according to claim 6 is characterized in that, this device also comprises:
The boundary user determining unit is less than or equal to preset strength difference limen value if be used for the difference of the signal strength signal intensity of the signal strength signal intensity of the described low power cell that the user receives and described macrocell, then determines that the user is described low power cell boundary user.
10. according to claim 6 to the described device of 9 arbitrary claims, it is characterized in that, described low power cell is Pico cell residential quarter Pico Cell or Micro-cell Microcell.
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| CN201210082997.0A CN103369610B (en) | 2012-03-27 | 2012-03-27 | The self adaptation method to set up of a kind of community switching biasing and device |
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| CN201210082997.0A CN103369610B (en) | 2012-03-27 | 2012-03-27 | The self adaptation method to set up of a kind of community switching biasing and device |
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| CN103369610B CN103369610B (en) | 2016-08-17 |
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| CN104254082A (en) * | 2014-09-24 | 2014-12-31 | 大唐移动通信设备有限公司 | Method and device for adjusting covering range of pico base station |
| CN104735723A (en) * | 2013-12-20 | 2015-06-24 | 普天信息技术研究院有限公司 | Load balancing method in heterogeneous network |
| CN105407493A (en) * | 2015-10-15 | 2016-03-16 | 上海师范大学 | Cell base station scope expansion and base station selection method based on signal to noise ratio |
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| SE515898C2 (en) * | 1999-05-21 | 2001-10-22 | Ericsson Telefon Ab L M | A method for cell load distribution in a cellular mobile radio communication system |
| CN100466843C (en) * | 2006-07-05 | 2009-03-04 | 华为技术有限公司 | Cell switching method based on cell separate offset |
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