CN102202384A - Method and device for controlling space division interference - Google Patents

Abstract

The invention discloses a method and device for controlling space division interference in an HSUPA (High Speed Uplink Packet Access) system. The method is characterized by comprising the following steps of: for two terminals to be adopted with space division multiplexing scheduling, respectively obtaining authorized power of an uplink channel of each terminal before and after space division interference limitation is introduced; according to the authorized power of the uplink channel of each terminal before and after the space division interference limitation is introduced, determining whether the space division scheduling has gain relative to individual scheduling; and, if so, adopting the space division multiplexing scheduling for the two terminals to be scheduled. According to the embodiment of the invention, the transmission power of an uplink shared channel of a space division user is limited so as to control uplink space division interference and improve system gain.

Description

A kind of empty control method and device that disturbs that divide

Technical field

The present invention relates to communication technical field, be meant that especially a kind of indoor HSUPA system hollow divides interference control method and device.

Background technology

In the HSUPA system, by Uplink Shared Channel is carried out the transmitting power that up channel is controlled in the power mandate.Can obtain the transmitting power of up channel by following formula:

$\mathrm{PRRI}=\min (\frac{P_{\mathrm{rx}}}{P_{e-\mathrm{base}}},\mathrm{UPH})$

Wherein, PRRI is the transmitting power of up channel; P _RxThe expression expectation received power has limited the interference of user to other community users, makes the power mandate can not cause the interference excessive to other users; P _E-baseThe interference size that receives for base station side, UPH is the smaller value of the transmitting power mandate of calculating, such as: UPH is by the end lifting of the making an uproar (ROT by permission, Rising Over Thermalnoise) and the smaller value of the Lmetric transmitting power mandate of calculating, wherein, Lmetric is for to local area with to the path loss ratio of adjacent area, obtains because UPH is a maximum transmission power by terminal, makes the power mandate can not surpass the upper limit of terminal transmit power.

In the prior art, in the Poewr control method of up channel, only the interference power lifting to overall system limits at uplink transmission power.In the HSUPA system, by the restriction to user uplink ROT, the control Uplink Shared Channel is to the lifting of system interference.Along with the introducing of space division multiplexing, the inter-user interference of multiplexing same asset becomes the principal element of restriction space division system gain.Owing to use identical sign indicating number resource between the empty user of branch, sky divides the interference size between the user directly to have influence on the performance of space division multiplexing.Therefore be necessary to divide interference to carry out corresponding power control at sky.

Summary of the invention

The sky that the invention provides in a kind of HSUPA system divides interference control method and device, when realizing in order to divide at sky, carries out sky branch Interference Control.

Sky in a kind of HSUPA system that the embodiment of the invention provides divides interference control method, comprising:

A. at two terminals waiting to adopt the space division multiplexing scheduling, obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively;

B. introduce the empty authorization power that divides the up channel of interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then adopt space division multiplexing to dispatch two terminals to be scheduled if determine to exist gain.

Sky branch Interference Control device in a kind of HSUPA system that the embodiment of the invention provides comprises:

The power acquiring unit is used at two terminals waiting to adopt the space division multiplexing scheduling, obtains the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively;

Control unit, be used for introducing the authorization power of the up channel of empty branch interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then two terminals to be scheduled are adopted the space division multiplexing scheduling if determine to exist gain.

In embodiments of the present invention, be used for, obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively at two terminals waiting to adopt the space division multiplexing scheduling; Introduce the empty authorization power that divides the up channel of interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then adopt space division multiplexing to dispatch two terminals to be scheduled if determine to exist gain.The embodiment of the invention is to by dividing the transmitting power of user uplink shared channel to limit to sky, reach control and go up the interference of line space branch, improve the purpose of system gain, and on the basis of power control, estimated the system throughput flow gain of empty branch, guaranteed the sky branch performance of system.

Description of drawings

Fig. 1 divides the schematic flow sheet of interference control method for the sky in the HSUPA system of the embodiment of the invention;

Fig. 2 is the schematic flow sheet of the method for the present invention's one specific embodiment;

Fig. 3 is the path loss schematic diagram that adheres to two users of two passages separately;

Fig. 4 divides the structural representation of Interference Control device for the sky in the HSUPA system of the embodiment of the invention.

Embodiment

In embodiments of the present invention, in order in the HSUPA system, to introduce empty timesharing,, obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively at two terminals waiting to adopt the space division multiplexing scheduling; Introduce the empty authorization power that divides the up channel of interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then adopt space division multiplexing to dispatch two terminals to be scheduled if determine to exist gain.

Referring to shown in Figure 1, the sky in a kind of HSUPA system of the embodiment of the invention divides interference control method may further comprise the steps:

Step 101:, obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively at two terminals waiting to adopt the space division multiplexing scheduling;

In the step 101, obtain terminal and introduce the authorization power of the up channel after the empty branch interference-limited and can realize like this:

Obtain the path loss of terminal to each passage, and the received power of this terminal when obtaining to divide to sky that the user is maximum to allow to disturb according to the interference threshold value of setting; The power and the transmitting power authorization power of the received power of this terminal when utilization divides to sky that the user is maximum to allow to disturb and the end lifting of making an uproar of permission obtain the authorization power that this terminal is introduced the up channel after empty branch interference-limited.

Obtaining terminal can realize like this to the path loss of each passage: by the up proportionate relationship of following channel to obtain each interchannel path loss to the received power ratio of each passage of first terminal; Utilize proportionate relationship, Primary Common Control Physical Channel (PCCPCH) transmitting power, the PCCPCH received power of each interchannel path loss, obtain the path loss of each terminal to each passage.

This terminal is introduced the power of the end lifting of making an uproar of received power, permission of this terminal that the authorization power of the up channel after empty branchs interference-limited can be when dividing to sky that the user is maximum to allow interference and the minimum value in the maximum transmission power authorization power.

The authorization power that this terminal is introduced the up channel before empty branchs interference-limited can be the power of the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

Step 102: introduce the empty authorization power that divides the up channel of interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling, if determine to exist gain, then two terminals to be scheduled are adopted the space division multiplexing scheduling, if determine not have gain, then jump out this flow process.

In step 102,, can select two terminals as two terminals to be scheduled, execution in step A if determine not have gain.Also can adopt the space division multiplexing scheduling to the terminal of high priority in two terminals to be scheduled.

In the step 102, determine that whether this dispatching space division exists gain with respect to the independent scheduling of not empty branch, can realize like this:

Judge whether to satisfy following relation,, then determine to exist gain if satisfy, otherwise, determine not exist gain,

tbsize(PRRI _1，SDMA)+tbsize(PRRI _2，SDMA)＞max(tbsize(PRRI ₁)，tbsize(PRRI ₂))，

Wherein, tbsize (PRRI _{1, SDMA}) be to shine upon the TB block size that can carry after first terminal is introduced empty branch interference-limited; Tbsize (PRRI ₁) be to shine upon the TB block size that can carry before first terminal is introduced empty branch interference-limited; Tbsize (PRRI _{2, SDMA}) be to shine upon the TB block size that can carry, tbsize (PRRI after second terminal is introduced empty branch interference-limited ₂) be to shine upon the TB block size that can carry before second terminal is introduced empty branch interference-limited.

Determine to have gain, think that then help total throughput hoisting empty the branch; Otherwise then think the little throughput with the single user of scheduling of the total throughout of dispatching in sky branch mode.

Referring to shown in Figure 2, the method for the present invention's one specific embodiment may further comprise the steps:

Step 201: calculate the path loss of user to each passage.

Referring to shown in Figure 3, U1, U2 belong to ANT1 respectively, and ANT2 that is to say, in the indoor environment, user 1 user 2 is in the coverage of antenna 1, antenna 2 respectively.

Known PCCPCH transmitting power PCCPCH _Tx, user's PCCPCH received power PCCPCH _RxAnd can obtain the relation of each interchannel path loss: L by the up received power of following the DPCH channel to each passage ₁₁: L ₂₁: ...: L _N1

Specific as follows: U1 and U2 are empty to be divided, and requires the transmitting power of U1 that the interference that ANT2 causes is not higher than certain thresholding: maxISCP.

P _SDMA＝maxISCP*L ₂₁/L ₁₁。

L _IjBe the path loss of passage i to terminal j.

Wherein, maxISCP can adopt the empty branch power proportions of the expectation received power * isolation thresholding of terminal 2.Wherein the expectation received power of terminal 2 can adopt: the expectation received power of the last scheduled of terminal 2; The smooth value of the expectation received power of several times scheduling before the terminal 2.

Path loss L wherein ₁₁L ₂₁Can calculate in the following way:

Under indoor multichannel environment:

${\mathrm{PCCPCH}}_{\mathrm{rx}}=\frac{{\mathrm{PCCPCH}}_{\mathrm{tx}}/N}{L_{11}}+\frac{{\mathrm{PCCPCH}}_{\mathrm{tx}}/N}{L_{21}}+\·\·\·+\frac{{\mathrm{PCCPCH}}_{\mathrm{tx}}/N}{L_{N1}}---\left(1\right)$

Wherein, PCCPCH _TxBe the PCCPCH channel emission power, N is total number of channels, L _N1Be the path loss of passage n to UE1.

By the up received power of following the DPCH channel to each passage of U1, can obtain the relation of each interchannel path loss:

L ₁₁∶L ₂₁∶...∶L _N1(2)

Just formula (2) is brought into formula (1) and can obtains the path loss L of active user to each passage respectively ₁₁, L ₂₁..., L _N1

Step 202: calculate and introduce the empty PRRI that divides the interference-limited front and back.

To two users of preparation dispatching space division, calculate respectively and introduce the empty PRRI that divides the interference-limited front and back:

PRRI _1，SDMA＝min(P _ROT，P _UPH，P _1，SDMA)

PRRI ₁＝min(P _ROT，P _UPH)

PRRI _2，SDMA＝min(P _ROT，P _UPH，P _2，SDMA)

PRRI ₂＝min(P _ROT，P _UPH)

Wherein, P _{1, SDMA}=maxISCP*L ₂₁/ L ₁₁

P _2，SDMA＝maxISCP*L ₁₂/L ₂₂。

Wherein, P _ROTPower for the end lifting of making an uproar that allows; P _UPHBe the transmitting power authorization power; P _{1, SDMA}The received power of the terminal 1 when dividing to sky that the user is maximum to allow to disturb for causing; PRRI ₁Authorization power for the up channel before the empty branch of the terminal 1 introducing interference-limited; PRRI _{1, SDMA}Authorization power for the up channel after the empty branch of the terminal 1 introducing interference-limited; PRRI _{2, SDMA}Authorization power for the up channel after the empty branch of the terminal 2 introducings interference-limited; PRRI ₂Authorization power for the up channel before the empty branch of the terminal 2 introducings interference-limited; P _{2, SDMA}The received power of the terminal 2 when dividing to sky that the user is maximum to allow to disturb for causing.

Step 203: carry out the space division system gain and judge.

Because the power mandate directly has influence on code check, therefore modulation system, and then have influence on efficiency of resource need divide between power authorization limitations could and the total throughput hoisting at sky and weigh.

Divide interference-limited to introduce the comparison of front and back PRRI according to sky, judge whether this dispatching space division exists gain with respect to the independent scheduling of not empty branch.

PRRI _{1, SDMA}, PRRI ₁, PRRI _{2, SDMA}, PRRI ₂Shine upon the TB block size that can carry, tbsize (PRRI respectively _{1, SDMA}) be to shine upon the TB block size that can carry after first terminal is introduced empty branch interference-limited; Tbsize (PRRI ₁) be to shine upon the TB block size that can carry before first terminal is introduced empty branch interference-limited; Tbsize (PRRI _{2, SDMA}) be to shine upon the TB block size that can carry, tbsize (PRRI after second terminal is introduced empty branch interference-limited ₂) be to shine upon the TB block size that can carry before second terminal is introduced empty branch interference-limited, and make the following judgment:

When satisfying tbsize (PRRI _{1, SDMA})+tbsize (PRRI _{2, SDMA})＞max (tbsize (PRRI ₁), tbsize (PRRI ₂)) time, to the active user to adopting dispatching space division;

Otherwise, can only dispatch the higher user of its medium priority, this method is fairly simple.Perhaps can from other satisfy the user of empty branch condition, select one to carry out above-mentioned judgement again,, can improve the resource utilization height like this up to the user who satisfies condition being arranged or having traveled through all users.

Lift specific embodiment below and describe technical scheme of the present invention in detail.

In the embodiment of the invention, in power mandate reference factor, introduce empty the branch and disturb one, to reach the empty purpose of disturbing of dividing of restriction.

The PRRI expression formula of upgrading

$\mathrm{PRRI}=\min (\frac{P_{\mathrm{rx}}}{P_{e-\mathrm{base}}},\mathrm{UPH},\frac{P_{\mathrm{SDMA}}}{P_{e-\mathrm{base}}})$

Referring to shown in Figure 4, the sky in a kind of HSUPA system of the embodiment of the invention divides the Interference Control device, comprising:

Power acquiring unit 41 is used at two terminals waiting to adopt the space division multiplexing scheduling, obtains the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively;

Control unit 42, be used for introducing the authorization power of the up channel of empty branch interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then two terminals to be scheduled are adopted the space division multiplexing scheduling if determine to exist gain.

Described power acquiring unit 41 is used to obtain the path loss of terminal to each passage, and the received power of this terminal when obtaining to divide to sky that the user is maximum to allow to disturb according to the interference threshold value of setting; The power and the transmitting power authorization power of the received power of this terminal when utilization divides to sky that the user is maximum to allow to disturb and the end lifting of making an uproar of permission obtain the authorization power that this terminal is introduced the up channel after empty branch interference-limited.

Described power acquiring unit 41 is used for the up proportionate relationship of following channel to obtain each interchannel path loss to the received power ratio of each passage by first terminal; Utilize proportionate relationship, PCCPCH channel emission power, the PCCPCH channel received power of each interchannel path loss, obtain the path loss of each terminal to each passage.

The power of the received power of this terminal when authorization power of the up channel after the empty branch interference-limited of this terminal introducing allows interference for sky being divided user's maximum, the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

The authorization power that this terminal is introduced the up channel before the empty branch interference-limited is the power of the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

Described control unit 42, if be used for determining not exist gain, then the terminal to high priority in two terminals to be scheduled adopts the space division multiplexing scheduling.

Described control unit 42 if be used for determining not have gain, then selects two terminals as two terminals to be scheduled, triggers the power acquiring unit and obtains the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back.

Described control unit 42 is used to judge whether to satisfy following relation, if satisfy, then determines to exist gain, otherwise, determine not exist gain,

tbsize(PRRI _1，SDMA)+tbsize(PRRI _2，SDMA)＞max(tbsize(PRRI ₁)，tbsize(PRRI ₂))

Wherein, tbsize (PRRI _{1, SDMA}) be to shine upon the TB block size that can carry after first terminal is introduced empty branch interference-limited; Tbsize (PRRI ₁) be to shine upon the TB block size that can carry before first terminal is introduced empty branch interference-limited; Tbsize (PRRI _{2, SDMA}) be to shine upon the TB block size that can carry, tbsize (PRRI after second terminal is introduced empty branch interference-limited ₂) be to shine upon the TB block size that can carry before second terminal is introduced empty branch interference-limited.

In embodiments of the present invention, be used for, obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively at two terminals waiting to adopt the space division multiplexing scheduling; Introduce the empty authorization power that divides the up channel of interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then adopt space division multiplexing to dispatch two terminals to be scheduled if determine to exist gain.In the specific implementation process, can be by the up DPCH that follows in each passage received power ratio, computing terminal arrives each passage path loss, and passes through the empty front and back power mandate energy data carried by data amount size of dividing, and carries out sky and divides the gain judgement.The embodiment of the invention is to by dividing the transmitting power of user uplink shared channel to limit to sky, reach control and go up the interference of line space branch, improve the purpose of system gain, and on the basis of power control, estimated the system throughput flow gain of empty branch, guaranteed the sky branch performance of system.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (16)

1. the sky in the HSUPA system divides interference control method, it is characterized in that this method may further comprise the steps:

A. at two terminals waiting to adopt the space division multiplexing scheduling, obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively;

B. introduce the empty authorization power that divides the up channel of interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then adopt space division multiplexing to dispatch two terminals to be scheduled if determine to exist gain.

2. method according to claim 1 is characterized in that, obtains the authorization power that terminal is introduced the up channel after the empty branch interference-limited in the steps A, comprising:

Obtain the path loss of terminal to each passage, and the received power of this terminal when obtaining to divide to sky that the user is maximum to allow to disturb according to the interference threshold value of setting;

The power and the transmitting power authorization power of the received power of this terminal when utilization divides to sky that the user is maximum to allow to disturb and the end lifting of making an uproar of permission obtain the authorization power that this terminal is introduced the up channel after empty branch interference-limited.

3. method according to claim 2 is characterized in that, obtains the path loss of terminal to each passage, comprising:

The up proportionate relationship of following channel to obtain each interchannel path loss to the received power ratio of each passage by first terminal;

Utilize proportionate relationship, PCCPCH channel emission power, the PCCPCH channel received power of each interchannel path loss, obtain the path loss of each terminal to each passage.

4. method according to claim 2, it is characterized in that the received power of this terminal when authorization power of the up channel after the empty branch interference-limited of this terminal introducing allows interference for sky being divided user's maximum, the power of the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

5. method according to claim 2 is characterized in that, the authorization power that this terminal is introduced the up channel before the empty branch interference-limited is the power of the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

6. method according to claim 1 is characterized in that, if determine not exist gain, then the terminal to high priority in two terminals to be scheduled adopts the space division multiplexing scheduling.

7. method according to claim 1 is characterized in that, if determine not have gain, then

Select two terminals as two terminals to be scheduled, execution in step A.

8. method according to claim 7 is characterized in that, determines that whether this dispatching space division exists gain with respect to the independent scheduling of not empty branch, comprising:

Judge whether to satisfy following relation,, then determine to exist gain if satisfy, otherwise, determine not exist gain,

tbsize(PRRI _1，SDMA)+tbsize(PRRI _2，SDMA)＞max(tbsize(PRRI ₁)，tbsize(PRRI ₂))，

Wherein, tbsize (PRRI _{1, SDMA}) be to shine upon the TB block size that can carry after first terminal is introduced empty branch interference-limited; Tbsize (PRRI ₁) be to shine upon the TB block size that can carry before first terminal is introduced empty branch interference-limited; Tbsize (PRRI _{2, SDMA}) be to shine upon the TB block size that can carry, tbsize (PRRI after second terminal is introduced empty branch interference-limited ₂) be to shine upon the TB block size that can carry before second terminal is introduced empty branch interference-limited.

9. the sky in the HSUPA system divides the Interference Control device, it is characterized in that this device comprises:

The power acquiring unit is used at two terminals waiting to adopt the space division multiplexing scheduling, obtains the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back respectively;

Control unit, be used for introducing the authorization power of the up channel of empty branch interference-limited front and back according to each terminal, determine whether this dispatching space division exists gain with respect to independent scheduling,, then two terminals to be scheduled are adopted the space division multiplexing scheduling if determine to exist gain.

10. device according to claim 9 is characterized in that, described power acquiring unit is used to obtain the path loss of terminal to each passage, and the received power of this terminal when obtaining to divide to sky that the user is maximum to allow to disturb according to the interference threshold value of setting; The power and the transmitting power authorization power of the received power of this terminal when utilization divides to sky that the user is maximum to allow to disturb and the end lifting of making an uproar of permission obtain the authorization power that this terminal is introduced the up channel after empty branch interference-limited.

11. device according to claim 10 is characterized in that, described power acquiring unit is used for the up proportionate relationship of following channel to obtain each interchannel path loss to the received power ratio of each passage by first terminal; Utilize proportionate relationship, PCCPCH channel emission power, the PCCPCH channel received power of each interchannel path loss, obtain the path loss of each terminal to each passage.

12. device according to claim 10, it is characterized in that the received power of this terminal when authorization power of the up channel after the empty branch interference-limited of this terminal introducing allows interference for sky being divided user's maximum, the power of the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

13. device according to claim 10 is characterized in that, the authorization power that this terminal is introduced the up channel before the empty branch interference-limited is the power of the end lifting of making an uproar of permission and the minimum value in the maximum transmission power authorization power.

14. device according to claim 9 is characterized in that, described control unit, if be used for determining not exist gain, then the terminal to high priority in two terminals to be scheduled adopts the space division multiplexing scheduling.

15. device according to claim 9, it is characterized in that, described control unit, if be used for determining not exist gain, then select two terminals as two terminals to be scheduled, trigger the power acquiring unit and obtain the authorization power that each terminal is introduced the up channel of empty branch interference-limited front and back once more.

16. device according to claim 15 is characterized in that, described control unit is used to judge whether to satisfy following relation, if satisfy, then determines to exist gain, otherwise, determine not exist gain,

tbsize(PRRI _1，SDMA)+tbsize(PRRI _2，SDMA)＞max(tbsize(PRRI ₁)，tbsize(PRRI ₂))，

Wherein, tbsize (PRRI _{1, SDMA}) be to shine upon the TB block size that can carry after first terminal is introduced empty branch interference-limited; Tbsize (PRRI ₁) be to shine upon the TB block size that can carry before first terminal is introduced empty branch interference-limited; Tbsize (PRRI _{2, SDMA}) be to shine upon the TB block size that can carry, tbsize (PRRI after second terminal is introduced empty branch interference-limited ₂) be to shine upon the TB block size that can carry before second terminal is introduced empty branch interference-limited.

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