CN105591993B - A kind of up-link interference coordination method and device for OFDMA system - Google Patents
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Abstract
The present invention relates to wireless communication technology fields, more particularly to a kind of up-link interference coordination method and device for OFDMA system.A kind of up-link interference coordination method and device for OFDMA system provided by the invention carries out assessment classification from two angles to UE, it is the annoyance level that UE generates adjacent area the susceptibility and UE of interference respectively, both ensure that being easy disturbed edge UE is dispatched to the minimum band resource of interference, can guarantee again simultaneously interferes stronger UE that can avoid the frequency band that adjacent area is planned in advance adjacent area, to the minizone strong jamming that is more effectively staggered, the performance of significant increase Cell Edge User, and evades and manage by reasonably interfering, so that performance loss is smaller, even it is obviously improved.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to an uplink interference coordination method and apparatus for an OFDMA system.
Background
A cellular wireless communication system based on OFDMA (Orthogonal Frequency Division Multiple Access) technology, such as LTE (Long Term Evolution), WIMAX (worldwide interoperability for Microwave Access) system, realizes orthogonality of signals by Frequency Division for users in a cell, and better solves the problem of interference in the cell. But as a cost, strong inter-cell interference is brought when the same frequency is networked. Cell edge users are far away from a service base station, and the receiving power of useful signals is low, so that the cell edge users are easily influenced by interference; meanwhile, the cell edge user is close to the adjacent cell, and interference to the adjacent cell is easily caused in the uplink data sending process. For these two reasons, the performance of the cell edge user becomes the key to examine whether the inter-cell interference is serious or not. Therefore, how to suppress inter-cell interference and improve edge user performance is an important research topic.
For the uplink based on the OFDMA system, interference comes from different users in the neighboring cells, the interference magnitude depends on the position and transmission power of the users, and the interference characteristics are complex. Due to the influence of the uplink power control technology, the uplink transmission power of each user is related to user channel fading, and the receiving power reaching the serving base station is often different, which causes different interference resistance among users and also causes great difference in interference to neighboring cells. Especially in sectorized cell topology, users at cell edge or users near cell center may cause strong uplink interference to neighboring cells.
Therefore, the edge users are determined only by judging the position information or the interfered condition of the users, and strong interference between cells cannot be avoided effectively by the interference coordination method for scheduling different frequency bands for the edge users of adjacent cells, because some central users close to the base station may generate strong interference to the edge users of co-located adjacent cells, the performance improvement of the existing uplink interference coordination method to the edge users is limited.
Disclosure of Invention
Aiming at the defect that some central users close to a base station can not generate strong interference on edge users of co-located adjacent cells in the prior detection technology, the invention provides an uplink interference coordination method and device for an OFDMA system.
In one aspect, the present invention provides an uplink interference coordination method for an OFDMA system, including:
a base station receives uplink pilot signal received power (RSRP) sent by User Equipment (UE);
judging whether the RSRP is smaller than a first preset threshold or not;
if the RSRP is smaller than a first preset threshold, scheduling edge frequency band resources of a cell to which the UE belongs for the UE;
if the RSRP is larger than or equal to a first preset threshold, judging whether the RSRP is smaller than a second preset threshold;
if the RSRP is greater than or equal to a first preset threshold and less than a second preset threshold, scheduling edge frequency band resources or high-interference-sensitivity frequency band resources of a cell to which the UE belongs for the UE;
if the RSRP is greater than or equal to a second preset threshold, sequentially judging whether the interference receiving power from the UE to each adjacent cell of the cell to which the UE belongs is greater than a third preset threshold;
if the RSRP is greater than or equal to a second preset threshold and the interference receiving power is greater than a third preset threshold, scheduling frequency band resources except a high interference sensitivity frequency band of an adjacent cell generating interference by the UE and edge frequency bands of all adjacent cells for the UE;
if the RSRP is greater than or equal to a second preset threshold and the interference receiving power is less than or equal to a third preset threshold, scheduling frequency band resources except edge frequency bands of all adjacent cells for the UE;
the first preset threshold is smaller than the second preset threshold, and the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided by the base station for each cell.
Further, the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is calculated by using the following formula:
further, the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided for each cell by the base station according to user loads of the cells, the edge frequency band of each cell is orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
In another aspect, the present invention further provides an uplink interference coordination apparatus for an OFDMA system, including:
the receiving module is used for receiving uplink pilot signal received power (RSRP) sent by User Equipment (UE) by a base station;
the first judging module is used for judging whether the RSRP is smaller than a first preset threshold or not;
a first scheduling module, configured to schedule, for the UE, an edge band resource of a cell to which the UE belongs if the RSRP is smaller than a first preset threshold;
the second judging module is used for judging whether the RSRP is smaller than a second preset threshold or not if the RSRP is larger than or equal to a first preset threshold;
a second scheduling module, configured to schedule, for the UE, an edge band resource or a high interference sensitivity band resource of a cell to which the UE belongs if the RSRP is greater than or equal to a first preset threshold and is less than a second preset threshold;
a third determining module, configured to sequentially determine whether interference received power from the UE to each neighboring cell of the cell to which the UE belongs is greater than a third preset threshold if the RSRP is greater than or equal to a second preset threshold;
a third scheduling module, configured to schedule, for the UE, frequency band resources except for a high interference sensitivity frequency band of an adjacent cell where the UE generates interference and edge frequency bands of all adjacent cells if the RSRP is greater than or equal to a second preset threshold and the interference received power is greater than a third preset threshold;
a fourth scheduling module, configured to schedule, for the UE, frequency band resources except edge frequency bands of all neighboring cells if the RSRP is greater than or equal to a second preset threshold and the interference received power is less than or equal to a third preset threshold;
the first preset threshold is smaller than the second preset threshold, and the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided by the base station for each cell.
Further, the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is calculated by using the following formula:
further, the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided for each cell by the base station according to user loads of the cells, the edge frequency band of each cell is orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
According to the uplink interference coordination method and device for the OFDMA system, the UE is evaluated and classified from two angles, namely the sensitivity of the UE to interference and the interference degree of the UE to the adjacent cell, so that the scheduling of the edge UE which is easy to be interfered to a frequency band resource with minimum interference is ensured, and meanwhile, the UE with strong interference to the adjacent cell can avoid a frequency band which is planned in advance by the adjacent cell, so that strong interference among cells is staggered more effectively, the performance of cell edge users is greatly improved, and the performance loss of the system is smaller and even obviously improved through reasonable interference avoidance and management.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 is a flowchart illustrating an uplink interference coordination method for an OFDMA system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a cell band resource planning according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a cell structure according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an uplink interference coordination apparatus for an OFDMA system according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will now be further explained in detail with reference to the accompanying drawings and examples.
Fig. 1 is a flowchart illustrating an uplink interference coordination method suitable for an OFDMA system in this embodiment, and as shown in fig. 1, the uplink interference coordination method for the OFDMA system in this embodiment includes:
s1, the base station receives the uplink pilot signal received power (RSRP) sent by the User Equipment (UE);
s2, judging whether the RSRP is smaller than a first preset threshold;
s3, if the RSRP in step S2 is smaller than the first preset threshold, scheduling edge band resources of the cell to which the UE belongs for the UE;
s4, if the RSRP in the step S2 is larger than or equal to a first preset threshold, judging whether the RSRP is smaller than a second preset threshold;
s5, if the RSRP in step S4 is less than the second preset threshold, scheduling edge band resources or high interference sensitivity band resources of the cell to which the UE belongs for the UE;
s6, if the RSRP in step S4 is greater than or equal to the second preset threshold, sequentially determining whether the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is greater than a third preset threshold;
s7, if the RSRP in step S6 is greater than or equal to the second preset threshold and the interference received power is greater than the third preset threshold, scheduling, for the UE, frequency band resources except the high interference sensitivity frequency band of the neighboring cell of the cell to which the UE belongs and the edge frequency bands of all neighboring cells;
s8, if the RSRP in step S6 is greater than or equal to a second preset threshold and the interference received power is less than or equal to a third preset threshold, scheduling frequency band resources for the UE except edge frequency bands of all neighboring cells;
the first preset threshold is smaller than the second preset threshold, and the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided by the base station for each cell.
Further, the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is calculated by using the following formula:
further, the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided for each cell by the base station according to user loads of the cells, the edge frequency band of each cell is orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
For example, the base station may perform interference susceptibility evaluation on the UEs in each cell through the received uplink pilot signal received power RSRP of the UEs, and classify the UEs.
For each UE i, judging the uplink of the UE received by the base stationPilot signal received power PUL_Rx_ServingCell(i) Whether or not it is less than a first preset threshold Pth_1If yes, UE is I-class interference sensitivity user, otherwise, P is further judgedUL_Rx_ServingCell(i) Whether or not less than a second preset threshold Pth_2If so, the UE is a level II interference sensitivity user, otherwise, the UE is a level III interference sensitivity user. For the above parameter Pth_1、Pth_2Requires Pth_1<Pth_2The method specifically sets according to the distribution situation of the pilot signal received power and the uplink interference power distribution situation of the UE in the OFDMA system in the cell. Therefore, the higher the interference sensitivity level of the user is, the less sensitive to interference is, and the better the anti-interference capability is.
Meanwhile, for the UE determined as the level III interference-sensitive user, the base station further evaluates whether the UE is an interference source user of each neighboring area according to the interference degree generated to the neighboring area. The specific process is as follows:
firstly, calculating the interference received power of the UE to each adjacent cell:
the interference received power from the UE to each adjacent cell of the cell to which the UE belongs is calculated by adopting the following formula:
then, the UE is judgedWhether it is greater than a third preset threshold IThresholdIf so, the UE is an I-level interference source user and has strong interference to the adjacent cell, otherwise, the UE is a II-level interference source user and has small interference to the adjacent cell. I isThresholdMay be based on the interference power distribution in the systemThe situation is specifically set.
On the basis of the UE classification, the base station may pre-plan the frequency band resources of the cells according to the load condition of the UE in each cell. The base station divides an edge frequency band and a high interference sensitivity frequency band for each cell respectively. And the edge frequency band of each cell is respectively and orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
Taking the cell structure shown in fig. 3 as an example, the frequency band resources divided by the base stations respectively being the cells cell0, cell1, cell2, cell3, and cell4 are shown in fig. 2. Of course, fig. 2 only shows one division of the frequency band resource for illustration, and other different division results may be available according to specific situations in the implementation process, and the division result shown in fig. 2 does not set any limit to the claims of the present application.
As shown in fig. 2, F01, F11, F21, F31, and F41 respectively correspond to edge bands of cells 0, cell1, cell2, cell3, and cell 4; f02, F12, F22, F32 and F42 respectively correspond to high interference sensitivity frequency bands of cells 0, 1, 2, 3 and 4; the black frequency band region is an edge frequency band scheduled by the base station for the adjacent cell, and the black frequency band region is forbidden to be used by the UE of the cell in the process of scheduling the frequency band for the UE by the base station.
The edge frequency bands of the cells are orthogonally offset from the edge frequency bands and the high interference sensitivity frequency bands of each neighboring cell, for example, as shown in fig. 3, the neighboring cells of cell0 are cell1, cell2 and cell4, i.e., the frequency band F01 is orthogonally offset from F11, F12, F21, F22, F41 and F42, respectively.
The method for scheduling frequency band resources for each cell UE comprises the following steps:
if the UE is an I-level interference sensitivity user, only the edge frequency band of the cell can be used;
if the UE is a level II interference sensitivity user, only a high interference sensitivity frequency band and an edge frequency band of a cell can be used;
if the UE is a level III interference-sensitive user and is a level I interference source user of a certain neighboring cell, the UE schedules and uses all frequency bands except the high interference-sensitive frequency band of the neighboring cell and the edge frequency bands of all neighboring cells. For example, if UE1 in cell0 is an interferer user of cell1, UE1 disables high interference sensitivity frequency band F12 of cell1, and all frequency bands except F11, F21, F41, and F12 can be used.
If the UE is a class III interference-sensitive user and is a class II interferer user for all neighboring cells, the UE may use all available frequency bands except the edge frequency bands for all neighboring cells. For example, UE2 within cell2, is a level III interference sensitive user and is a level II interferer user for all neighboring cells, then UE2 may use all frequency bands except F01, F11, and F31.
According to the uplink interference coordination method for the OFDMA system, the UE is evaluated and classified from two angles, namely the sensitivity of the UE to interference and the interference degree of the UE to the adjacent cell, so that the edge UE which is easy to be interfered is scheduled to a frequency band resource with minimum interference, and meanwhile, the UE with strong interference to the adjacent cell can avoid a frequency band which is planned in advance by the adjacent cell, the strong interference among the cells is staggered more effectively, the performance of the edge users of the cells is greatly improved, and the performance loss of the system is small through reasonable interference avoidance and management, and even the system is obviously improved.
Correspondingly, as shown in fig. 4, the present embodiment further provides an uplink interference coordination apparatus for an OFDMA system, including:
the receiving module is used for receiving uplink pilot signal received power (RSRP) sent by User Equipment (UE) by a base station;
the first judging module is used for judging whether the RSRP is smaller than a first preset threshold or not;
a first scheduling module, configured to schedule, for the UE, an edge band resource of a cell to which the UE belongs if the RSRP is smaller than a first preset threshold;
the second judging module is used for judging whether the RSRP is smaller than a second preset threshold or not if the RSRP is larger than or equal to a first preset threshold;
a second scheduling module, configured to schedule, for the UE, an edge band resource or a high interference sensitivity band resource of a cell to which the UE belongs if the RSRP is greater than or equal to a first preset threshold and is less than a second preset threshold;
a third determining module, configured to sequentially determine whether interference received power from the UE to each neighboring cell of the cell to which the UE belongs is greater than a third preset threshold if the RSRP is greater than or equal to a second preset threshold;
a third scheduling module, configured to schedule, for the UE, frequency band resources except for a high interference sensitivity frequency band of an adjacent cell where the UE generates interference and edge frequency bands of all adjacent cells if the RSRP is greater than or equal to a second preset threshold and the interference received power is greater than a third preset threshold;
a fourth scheduling module, configured to schedule, for the UE, frequency band resources except edge frequency bands of all neighboring cells if the RSRP is greater than or equal to a second preset threshold and the interference received power is less than or equal to a third preset threshold;
the first preset threshold is smaller than the second preset threshold, and the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided by the base station for each cell.
Further, the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is calculated by using the following formula:
further, the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided for each cell by the base station according to user loads of the cells, the edge frequency band of each cell is orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
The uplink interference coordination device for the OFDMA system provided by the embodiment evaluates and classifies the UE from two angles, namely the sensitivity of the UE to interference and the interference degree of the UE to the adjacent cell, not only ensures that the edge UE which is easily interfered schedules to a frequency band resource with minimum interference, but also ensures that the UE with stronger interference to the adjacent cell can avoid the frequency band which is planned in advance by the adjacent cell, thereby more effectively staggering strong interference between cells, greatly improving the performance of cell edge users, avoiding and managing through reasonable interference, ensuring that the performance loss of the system is smaller, and even obviously improving the performance.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (4)
1. An uplink interference coordination method for an OFDMA system, the method comprising:
a base station receives uplink pilot signal received power (RSRP) sent by User Equipment (UE);
judging whether the RSRP is smaller than a first preset threshold or not;
if the RSRP is smaller than a first preset threshold, scheduling edge frequency band resources of a cell to which the UE belongs for the UE;
if the RSRP is larger than or equal to a first preset threshold, judging whether the RSRP is smaller than a second preset threshold;
if the RSRP is greater than or equal to a first preset threshold and less than a second preset threshold, scheduling edge frequency band resources or high-interference-sensitivity frequency band resources of a cell to which the UE belongs for the UE;
if the RSRP is greater than or equal to a second preset threshold, sequentially judging whether the interference receiving power from the UE to each adjacent cell of the cell to which the UE belongs is greater than a third preset threshold;
if the RSRP is greater than or equal to a second preset threshold and the interference receiving power is greater than a third preset threshold, scheduling frequency band resources except a high interference sensitivity frequency band of an adjacent cell generating interference by the UE and edge frequency bands of all adjacent cells for the UE;
if the RSRP is greater than or equal to a second preset threshold and the interference receiving power is less than or equal to a third preset threshold, scheduling frequency band resources except edge frequency bands of all adjacent cells for the UE;
the first preset threshold is smaller than the second preset threshold, and the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided by the base station for each cell:
the edge frequency band and the high interference sensitivity frequency band are frequency bands which are pre-divided for each cell by the base station according to the user load of the cell, the edge frequency band of each cell is respectively and orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
2. The method of claim 1, wherein the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is calculated by using the following formula:
wherein,interference received power, P, for the ith UE to the jth neighbor cell of the cell to which the UE belongsUL_Rx_ServingCell(i) The uplink pilot signal received power of the cell to which the ith UE belongs,PLServing(i) indicating the path loss from the ith UE to the cell,indicating the path loss from the ith UE to the jth adjacent cell of the cell to which the UE belongs.
3. An uplink interference coordination device for an OFDMA system, the device comprising:
the receiving module is used for receiving uplink pilot signal received power (RSRP) sent by User Equipment (UE) by a base station;
the first judging module is used for judging whether the RSRP is smaller than a first preset threshold or not;
a first scheduling module, configured to schedule, for the UE, an edge band resource of a cell to which the UE belongs if the RSRP is smaller than a first preset threshold;
the second judging module is used for judging whether the RSRP is smaller than a second preset threshold or not if the RSRP is larger than or equal to a first preset threshold;
a second scheduling module, configured to schedule, for the UE, an edge band resource or a high interference sensitivity band resource of a cell to which the UE belongs if the RSRP is greater than or equal to a first preset threshold and is less than a second preset threshold;
a third determining module, configured to sequentially determine whether interference received power from the UE to each neighboring cell of the cell to which the UE belongs is greater than a third preset threshold if the RSRP is greater than or equal to a second preset threshold;
a third scheduling module, configured to schedule, for the UE, frequency band resources except for a high interference sensitivity frequency band of an adjacent cell where the UE generates interference and edge frequency bands of all adjacent cells if the RSRP is greater than or equal to a second preset threshold and the interference received power is greater than a third preset threshold;
a fourth scheduling module, configured to schedule, for the UE, frequency band resources except edge frequency bands of all neighboring cells if the RSRP is greater than or equal to a second preset threshold and the interference received power is less than or equal to a third preset threshold;
the first preset threshold is smaller than the second preset threshold, and the edge frequency band and the high interference sensitivity frequency band are frequency bands pre-divided by the base station for each cell:
the edge frequency band and the high interference sensitivity frequency band are frequency bands which are pre-divided for each cell by the base station according to the user load of the cell, the edge frequency band of each cell is respectively and orthogonally staggered with the edge frequency band and the high interference sensitivity frequency band of each adjacent cell, and the high interference sensitivity frequency band of each cell is orthogonally staggered with the high interference sensitivity frequency band of each adjacent cell.
4. The apparatus of claim 3, wherein the interference received power from the UE to each neighboring cell of the cell to which the UE belongs is calculated by using the following formula:
wherein,interference received power, P, for the ith UE to the jth neighbor cell of the cell to which the UE belongsUL_Rx_ServingCell(i) The uplink pilot signal received power of the cell to which the ith UE belongs,PLServing(i) indicating the path loss from the ith UE to the cell,indicating the path loss from the ith UE to the jth adjacent cell of the cell to which the UE belongs.
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| CN102378196A (en) * | 2010-08-25 | 2012-03-14 | 普天信息技术研究院有限公司 | Uplink co-site interference inhibiting method |
| CN102857923A (en) * | 2011-06-29 | 2013-01-02 | 普天信息技术研究院有限公司 | Uplink interference coordination combined power control method among communities |
| CN102857928A (en) * | 2011-06-29 | 2013-01-02 | 普天信息技术研究院有限公司 | Uplink interference coordination method |
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| US9337906B2 (en) * | 2012-03-30 | 2016-05-10 | Nec Corporation | Feedback and scheduling for coordinated multi-point (CoMP) joint transmission (JT) in orthogonal frequency division multiple access (OFDMA) |
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| CN102378196A (en) * | 2010-08-25 | 2012-03-14 | 普天信息技术研究院有限公司 | Uplink co-site interference inhibiting method |
| CN102857923A (en) * | 2011-06-29 | 2013-01-02 | 普天信息技术研究院有限公司 | Uplink interference coordination combined power control method among communities |
| CN102857928A (en) * | 2011-06-29 | 2013-01-02 | 普天信息技术研究院有限公司 | Uplink interference coordination method |
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