CN101031127A - Method for decreasing same channel interference between users of upper FDMA cellular system - Google Patents

Abstract

The method comprises: the base station allocates the dedicated resources for the edge users, and ensures an overlapping between the user-dedicated resources in adjacent cells or sectors; user monitors and detects the downlink signals of current cell and sector or adjacent cell and sector, which contains flag information, to get downlink signal detection information; estimating the anti-interference status of user and the interference to the users in adjacent cell or sector; according to the result, allocating the right of using the resources, and then scheduling and allocating the resources; finally, adapting the uplink of user.

Description

The method that reduces cochannel interference between the user of up FDMA cellular system

Technical field

The present invention relates to a kind of method that cochannel disturbs that reduces of communication technical field, specifically is a kind of method that cochannel disturbs between the user that reduces that is applied to up FDMA cellular system.

Background technology

FDMA (frequency division multiple access access) is the main access mode that cellular system adopts, and is characterized in that different users use different frequency spectrum resources in connecting system.At present, OFDM (OFDM) technology and SC-OFDM (single carrier orthogonal frequency division multiplexing) technology are to realize the major technique of FDMA mode.3GPP tissue (3G (Third Generation) Moblie partner plan) international organization adopts the SC-OFDM technology to realize up FDMA cellular system when design EUTRA (universal mobile telecommunications system of evolution and the access of continental rise radio) and EUTRAN (the universal mobile telecommunications system net of evolution and continental rise radio access network) (perhaps be called Super 3G: super 3 g mobile communication system) exactly.

Usually, cellular system is divided into several orthohexagonal sub-districts to service coverage area, and at present, each sub-district generally is divided into 3 sectors or 6 sectors again.In up FDMA cellular system, sub-district or sector base stations distribute ascending resource (abbreviating resource hereinafter as) and ascending power for the user, and resource generally comprises time interval resource, frequency spectrum resource, also may comprise code source or the like.In real system, because entire spectrum is multiplexing by all sub-districts or sector, when two users in adjacent two sub-districts or the sector are assigned to identical resource, cochannel will take place and disturb in these two users, and this interference is especially remarkable when above-mentioned two users are positioned at sub-district or sector borders.Therefore, the cochannel that needs the corresponding method of design to reduce between the user disturbs.

In some technical literatures,, have four kinds of methods to can be used for reducing cochannel interference between the user at the up FDMA cellular system that EUTRA requires:

(1) simple sub-district or the inter-sector interference method coordinating/avoid: a part of resource is only used in each sub-district or sector, be called " sub-district or sector-specific resource ", and the private resource that guarantees neighbor cell or sector does not have overlapping, disturbs thereby avoid producing serious cochannel between the user at sub-district or sector borders place.Because each sub-district or sector-specific resource can not be multiplexing by neighbor cell or sector, thereby its spectrum reuse coefficient reduces greatly, causes the total speed of transfer of data of system obviously to descend.Referring to patent: " reducing the sub-carrier wave distribution method of presence of intercell interference in the OFDM cellular environment ", application (patent) number: 200480006260.4, open (bulletin) number: CN1759582 applies for (patent right) people: LG Electronics Inc.)

(2) have the method for the Inter-Cell Interference Coordination of higher spectrum reuse coefficient/avoid: each sub-district or sector mark off specific resource for boundary user wherein, be called " boundary user private resource ", and it is overlapping to guarantee that boundary user private resource between neighbor cell or sector does not have, and disturbs thereby avoid producing serious cochannel between the user at sub-district or sector borders place.This boundary user private resource can be multiplexing by the non-boundary user in the neighbor cell, thereby its spectrum reuse coefficient is higher.Referring to document: 3GPP, R1-050629, " Inter-cell interference mitigation ", Huawei.(3GPP document, numbering: R1-050629, " inter-cell interference restraint method ", Huawei company)

(3) method of inter-cell interference cancellation: utilization multiuser detection, earlier co-channel interference signal is carried out the demodulation sign indicating number, rebuild interference signal then, from received signal, deduct the interference signal of reconstruction again, obtain useful signal at last, thereby the cochannel of eliminating between the user disturbs.Referring to document: 3GPP, R1-060418, " TP on uplink inter-cell interference cancellation ", RITT, Huawei, CATT.(3GPP document, numbering: R1-060418, " inter-cell interference cancellation method and standardized text suggestion ", RITT company, Huawei company, CATT company)

(4) method that combines with interference eliminated of Inter-Cell Interference Coordination/avoid: whole resource had be not divided into the suitable interference coordination/resource of avoiding and the resource of suitable interference eliminated with occuring simultaneously, for the resource that is suitable for interference coordination/avoid, the cochannel that employing method (2) reduces between the user disturbs; For the resource that is suitable for interference eliminated, the cochannel that employing method (3) reduces between the user disturbs.Referring to document: 3GPP, R1-060419, " Combining Inter-cell-interference co-ordination/avoidance withcancellation in uplink and TP ", RITT, Huawei, CATT.(3GPP document, numbering: R1-060419, " method and standardized text suggestion that Inter-Cell Interference Coordination/avoid is combined with interference eliminated ", RITT company, Huawei company, CATT company)

Method (1) have realize simple, need not the advantage of coordinating communication between sub-district or sector, but exist the lower shortcoming of spectrum reuse coefficient; Method (2) has kept the advantage of method (1), and have higher spectrum reuse coefficient, but when being the boundary user Resources allocation, because optional resource-constrained, to cause the efficient of scheduling of resource that bigger decline is arranged, thereby make the total speed of transfer of data of system that bigger decline be arranged; Method (3) has overcome the shortcoming of method (2), also has higher spectrum reuse coefficient, but it needs bigger computing cost carry out the reconstruction and the elimination of interference signal, perhaps need to introduce certain minizone and coordinate, with set up interference user right/group simplifies calculating; Method (4) associated methods (2) and method (3), but need divide being suitable for the interference coordination/resource of avoiding and the resource of suitable interference eliminated, and use the different methods that cochannel disturbs between the user that reduce, this has increased the implementation complexity of whole proposal, in addition, in order to guarantee the adaptivity of this method, also need to increase the Signalling exchange between user and base station.Therefore, above-mentioned four kinds of methods run into big difficulty in actual applications.

Summary of the invention

The objective of the invention is at the multiplexing coefficient of prior art intermediate frequency spectrum lower, or the total speed of the transfer of data of system is lower, or implementation complexity is higher, or the more problem of Signalling exchange between user and base station, a kind of method that cochannel between the user disturbs that reduces of up FDMA cellular system is provided.The present invention is the method that a kind of sub-district or inter-sector interference are coordinated/avoided, each sub-district or sector mark off the boundary user private resource for boundary user wherein, and guarantee that the boundary user private resource between neighbor cell or sector does not have overlapping, this boundary user private resource can be multiplexing by the non-boundary user in neighbor cell or the sector, and is higher to guarantee spectrum reuse coefficient of the present invention.

In the invention process process, at first, the user monitors and detects the downstream signal of a plurality of neighbor cells or sector, then the anti-interference of self and the situation of disturbing user in neighbor cell or the sector are judged, and will be anti-interference with the situation of disturbing user in neighbor cell or the sector periodically or triggering property report to the base station; Or the user directly will monitor and the metrical information of detected downstream signal periodically or triggering property ground report to the base station, by the base station the anti-interference of user and the situation of disturbing user in neighbor cell or the sector are judged then, Signalling exchange is less between the user of this process and base station.At last, anti-interference and the situation of disturbing user in neighbor cell or the sector that the base station is different according to the user, distribute different resources use right limits, for the user who is easy to disturb user in neighbor cell or the sector, its resource that has authority to use of base station limits, and may reduce its transmitting power, and disturb to reduce its cochannel the boundary user of neighbor cell or sector, thus the message transmission rate of the boundary user of raising sub-district or sector; For the user who is not easy to disturb user in neighbor cell or the sector, the base station makes its boundary user private resource to this sub-district or sector have the candidate rights of using, or may improve its transmitting power, higher with the total speed of transfer of data that keeps system, the assigning process of this resources use right limit is comparatively simple.So the present invention has that the spectrum reuse coefficient is higher, the total speed of the transfer of data of system is higher, it is simpler to realize when realizing reducing the target that cochannel disturbs between the user, advantage such as Signalling exchange is less between user and base station.

The present invention is achieved through the following technical solutions, and specifically comprises the steps:

Step 1: each sub-district or sector mark off the boundary user private resource for boundary user wherein, and the boundary user private resource between assurance neighbor cell or sector does not have overlapping, and described boundary user private resource can be multiplexing by the non-boundary user in neighbor cell or the sector;

Step 2: the user monitors and detects the downstream signal that contains identification information of this sub-district or sector and neighbor cell or sector, obtains the detection information of downstream signal;

Step 3:, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector according to the detection information of described downstream signal;

Step 4: the base station is according to the anti-interference of user and the situation of disturbing user in neighbor cell or the sector, the rights of using of Resources allocation;

Step 5: scheduling of resource is carried out, Resources allocation according to the rights of using of user to resource in the base station;

Step 6: the base station is carried out adaptive according to resource allocation result to user's up link.

In the described step 2, described detection information comprises: the identification information of sub-district or sector and user arrive the path loss values of this sub-district or sector.

In the described step 3, according to described detection information, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector, again judged result is reported to the base station by the user; Perhaps the user reports described detection information to the base station, according to described detection information, judges the anti-interference of user and the situation of disturbing user in neighbor cell or the sector by the base station.

In the described step 3, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector, be meant: the user is made comparisons to the path loss values and the jamproof path loss threshold value of this sub-district or sector, if surpass threshold value, then this user is the strong user of antijamming capability, otherwise this user is the weak user of antijamming capability; The user is made comparisons with the path loss threshold value of disturbing user in neighbor cell or the sector to the path loss values of a plurality of neighbor cells or sector, if surpass threshold value, then this user is easy to disturb user in neighbor cell or the sector, otherwise this user is not easy to disturb user in neighbor cell or the sector.So, all users are divided into four classes: antijamming capability is strong and be easy to disturb user in neighbor cell or the sector, antijamming capability is strong and be not easy to disturb user in neighbor cell or the sector, antijamming capability is weak and be easy to disturb user neighbor cell or sector in, a little less than the antijamming capability and be not easy to disturb user in neighbor cell or the sector.

In the described step 3, described user periodically reports to the base station; Perhaps described user changes as the report of trigger condition to the base station with the anti-interference of self and the situation of disturbing user in neighbor cell or the sector.

In the described step 4, described Resources allocation rights of using, be meant: strong and be easy to disturb the user of user in neighbor cell or the sector for antijamming capability, surplus resources beyond the boundary user private resource of the boundary user private resource of if possible disturbed sub-district or sector and this sub-district or sector is not an empty set, then the base station makes its lack of competence use the boundary user private resource of disturbed sub-district of possibility or sector and the boundary user private resource of this sub-district or sector, and have authority to use described surplus resources, if described surplus resources is an empty set, then the base station makes it have authority to use the boundary user private resource of this sub-district or sector, and lack of competence is used the resource except that the boundary user private resource of this sub-district or sector; Strong and be not easy to disturb the user of user in neighbor cell or the sector for antijamming capability, the base station makes it that the resource of authority use except that the boundary user private resource of this sub-district or sector be arranged, and the boundary user private resource of this sub-district or sector is had the candidate rights of using; For a little less than the antijamming capability and be easy to disturb a little less than the user of user in neighbor cell or the sector and the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, the base station makes it have authority to use the boundary user private resource of this sub-district or sector, and lack of competence is used the resource except that the boundary user private resource of this sub-district or sector.

In the described step 4, for a little less than the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, base station to make it promote transmitting power to obtain higher message transmission rate; Strong and be easy to disturb the user of user in neighbor cell or the sector for antijamming capability, the base station makes it reduce transmitting power to reduce the interference to user in neighbor cell or the sector.

In the described step 5, described scheduling of resource, be meant: at first, the resource allocation beyond the boundary user private resource in this sub-district is given the user who this resource is had rights of using in the base station, then, the user who this resource is had rights of using is distributed to the boundary user private resource in the base station, and is last, the base station will be distributed to resource requirement to untapped boundary user private resource, and this resource be had the user of candidate rights of using.

Below technical solution of the present invention is described further:

(1) each sub-district or sector mark off the boundary user private resource for wherein boundary user

At first, the resource in the up FDMA cellular system is carried out serial number 1,2 by least unit ..., N, so all resources can be expressed as S set, contain (the individual element of C (S)=N):

S＝{S(i)|1≤i≤C(S)，S(i)＜S(i+1)，1≤S(i)≤N} (1)

Then, with S be divided into disjoint B the set as boundary user private resource S (j) (j is a boundary user private resource call number, and 1≤j≤B), wherein, B is a system design parameters, such as, for 3 sector systems, can make B=3.S (j) contains the individual element of C (S (j)) respectively:

S(j)＝{S _j(i)|1≤i≤C(S(j))，S _j(i)＜S _j(i+1)，S _j(i)∈S}(1≤j≤B)(2)

And S (j) satisfies:

${\∪}_{j=1}^{B}s\left(j\right)=s,$ S (k) ∩ S (l)= (1≤k, l≤B, and k ≠ l) (3)

At last, a S (j) is chosen as its boundary user private resource in each sub-district or sector, and guarantee that neighbor cell or sector choose different S (j), thereby make the boundary user private resource non-overlapping copies of neighbor cell or sector, that is, the order label of establishing sub-district or sector is X (X=1,2, ...), it is designated I _X(I _X∈ I, I are the set of sub-district or sector mark in the cellular system), by sub-district or sector mark I _XMapping function to boundary user private resource call number j is J (I _X), so corresponding boundary user private resource is S (J (I _X)), so,

J (I _Y) ≠ J (I _Z) (as sectors/cells Y, Z is adjacent)

That is S (J (I, _Y)) ∩ S (J (I _Z))= (4)

In addition, the boundary user private resource of sub-district or sector can be multiplexing by the non-boundary user in neighbor cell or the sector, obtains higher spectrum use factor, that is, as sub-district or sector Y, when Z is adjacent, S (J (I _Y)) can be used S (J (I by the non-boundary user in sub-district or the sector Z _Z)) can be used by the non-boundary user in sub-district or the sector Y.

(2) user monitors and detects the downstream signal that contains identification information of this sub-district or sector and neighbor cell or sector

The user monitors and detects the downstream signal of this sub-district or sector and neighbor cell or sector, establishes that user u is positioned at the sub-district or sector X (is designated I _X), its neighbor cell or sector are Y, Z ... (be designated I _Y, I _Z...).User u monitors and also to detect from X, Y, Z ... downstream signal Ω, this downstream signal Ω need contain the identification information I of sub-district or sector _X, I _Y, I _Z....In the sub-district or the descending synchronous signal channel signal of sector, or in the downlink pilot frequency channel signal of sub-district or sector, generally all can contain such identification information.The content that the user detects comprises the mean receiving power value β of downstream signal Ω _X, β _Y, β _Z... with the identification information of sub-district or sector, and with β _X, β _Y, β _Z... divided by the transmission power level of downstream signal Ω, obtain the user to this sub-district or sector X, Y, Z ... path loss values PL _X, PL _Y, PL _Z...Path loss values generally comprised the user to the sub-district or the sector (radio wave is at spatial transmission apart from loss, its received-signal strength reduces along with the increase of propagation distance, cause apart from loss), shadow fading be (owing to may exist building to stop the radio wave propagation, cause shadow fading) with the antenna directional angle receiving gain (because radio wave is during with different angle directive antenna, its gain is different, therefore, user's signal to the sub-district or the deflection of the reception antenna of sector determined its gain size).

(3) judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector

If user u to this sub-district or the path loss values of sector X be PL _X, to a plurality of neighbor cells or sector Y, Z ... path loss values be PL _Y, PL _Z..., so, can be according to PL _X, PL _Y, PL _Z... the anti-interference of user and the situation of disturbing user in neighbor cell or the sector are judged, and concrete grammar is: the path loss values PL that the user is arrived this sub-district or sector X _XMake comparisons with jamproof path loss threshold value Λ, if PL _XGreater than Λ, then this user is the strong user of antijamming capability, otherwise this user is the weak user of antijamming capability; With the path loss values PL of user to a plurality of neighbor cells or sector _Y, PL _Z... make comparisons with the path loss threshold value Θ that disturbs user in neighbor cell or the sector, if PL _Y, PL _Z... can exist certain numerical value or a few numerical value greater than Θ, then this user is easy to disturb user in neighbor cell or the sector, otherwise this user is not easy to disturb user in neighbor cell or the sector.So, all users are divided into four classes: antijamming capability is strong and be easy to disturb user in neighbor cell or the sector, antijamming capability is strong and be not easy to disturb user in neighbor cell or the sector, antijamming capability is weak and be easy to disturb user neighbor cell or sector in, a little less than the antijamming capability and be not easy to disturb user in neighbor cell or the sector.Above-mentioned criterion is written as formula (5):

(5)

Can realize by the user the anti-interference of user and the process that the situation of disturbing user in neighbor cell or the sector judges, that is, by the user according to it to this sub-district or the path loss values PL of sector and a plurality of neighbor cell or sector _X, PL _Y, PL _Z... and identification information Γ, the anti-interference of user and the situation of disturbing user in neighbor cell or the sector are judged, obtain judged result Ψ, more periodically, be reporting period promptly with time τ Ψ; Or triggering property ground, promptly change as trigger condition with Ψ, report to the base station.The required signaling consumption of this report is smaller, such as, always have 2 with a cell ID ^αIndividual cellular system is an example, and each cell ID can be encoded with the α bit, the strong and weak 1 bit flag position that only needs of user's antijamming capability; The user is not easy to disturb in neighbor cell or the sector user also only to need 1 bit flag position, the user is easy to user to k sub-district or sector and causes the report of interference to need 1+ α k bit (whether 1 bit is easy to disturb the flag bit of user in neighbor cell or the sector as the user, and α k bit is as disturbed sub-district or the sign of sector).

Especially, in 3 at present the most frequently used sectorized cell systems, there is special feedback report mode, can further reduces number of bits of feedback.3 sectors (are designated I ₁, I ₂, I ₃) adopt 2 bits to be encoded to 01,10,11 respectively.Owing in 3 sectorized cell systems, be designated I _XThe sector can not also be I with another sign _XThe sector adjacent and cause interference, so whether the user in the X of sector is easy to disturb the situation of user neighbor cell or sector in to have only 4 kinds altogether, need feeds back and to get final product with 2 bits, as the formula (6):

(6)

Such as, when the middle user u of sector 1 is not easy to disturb in neighbor cell or the sector user, its feedback 00; When the middle user u of sector 1 is easy to user in the interference sector 2, its feedback 10; When the middle user u of sector 1 is easy to user in the interference sector 3, its feedback 11; When the middle user u of sector 1 is easy to user in the interference sector 2,3, its feedback 10.When not adopting above-mentioned feedback system, when the middle user u of sector 1 is easy to user in the interference sector 2,3, need feedback 1+4=5 bit, its feedback signal load is with net increase 150%.

Under aforesaid way, the total number of bits of feedback of user be 3 bits (1 bit identification user antijamming capability strong with a little less than; Whether 2 bit identification users are easy to disturb user in neighbor cell or the sector).

Can realize also that to the anti-interference of user and the process that the situation of disturbing user in neighbor cell or the sector judges promptly, the user arrives the path loss values PL of this sub-district or sector and a plurality of neighbor cell or sector to it by the base station _X, PL _Y, PL _Z... and identification information Γ, periodically, be reporting period promptly with time τ; Or triggering property ground, promptly change as trigger condition with metrical information, to the base station report, then by the base station according to this user to this sub-district or the path loss values PL of sector and a plurality of neighbor cell or sector _X, PL _Y, PL _Z... and identification information Γ, the anti-interference of user and the situation of disturbing user in neighbor cell or the sector are judged, obtain judged result Ψ.Document at the 3GPP tissue: TS 25.133V7.5.0, " Requirements for supportof radio resource management (FDD) (Release 7) " (under the Frequency Division Duplexing (FDD) condition, carrying out the equipment requirements (the 7th edition) of RRM), has the mechanism of user to base station report metrical information, be specially: but user's cycle or triggering property ground are to the measurement result of 32 sub-districts of report, base station or sector, the measurement content comprises the reception code word power (CPICH RSCP) of Common Pilot Channel etc., and above-mentioned information promptly can be used as the mean receiving power value β of the downstream signal of this sub-district or sector and a plurality of neighbor cell or sector _X, β _Y, β _Z... and identification information Γ.Like this, the present invention does not just need the user to send extra up signaling to the base station in implementation process.

(4) rights of using of base station assigns resource

The base station is according to the anti-interference of user and the judgement information Ψ that disturbs user's situation in neighbor cell or the sector, the rights of using of Resources allocation.Be specially:

In the sub-district or sector X (be designated I _X) in, strong and be easy to interfered cell or sector Y for antijamming capability, Z ... interior user's user u, the boundary user private resource S (J (I of if possible disturbed sub-district or sector _Y)) ∪ S (J (I _Z)) ∪ ... boundary user private resource S (J (I with this sub-district or sector _X)) in addition surplus resources R (u)=S (S (J (I _X)) ∪ S (J (I _Y)) ∪ S (J (I _Z)) ∪ ...) be not empty set, then the base station makes it have authority to use described surplus resources R (u), if R (u)=, then the base station makes it have authority to use the boundary user private resource S (J (I of this sub-district or sector _X)), lack of competence is used the resource S (S (J (I except that the boundary user private resource of this sub-district or sector _X))); Strong and be not easy to disturb the user u of user in neighbor cell or the sector, base station to make it have authority to use resource R (u)=S (S (J (I except that the boundary user private resource of this sub-district or sector for antijamming capability _X))), and to the boundary user private resource S (J (I of this sub-district or sector _X)) the candidate rights of using are arranged; For a little less than the antijamming capability and be easy to disturb a little less than the user of user in neighbor cell or the sector and the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, the base station makes it have authority to use the boundary user private resource R (u) of this sub-district or sector=S (J (I _X)), lack of competence is used the resource S (S (J (I except that the boundary user private resource of this sub-district or sector _X))).

In addition, in order further to improve the message transmission rate of boundary user, for a little less than the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, the base station can make it promote transmitting power to obtain higher message transmission rate; For the cochannel in the further reduction system disturbs, strong and be easy to disturb the user of user in neighbor cell or the sector for antijamming capability, the base station can make it reduce transmitting power to reduce the interference to user in neighbor cell or the sector.

Above-mentioned criterion is written as formula (7):

(7)

The result that the user who is obtained by formula (7) limits resources use right is Φ.

(5) base station is according to the rights of using of user to resource, Resources allocation

Resource scheduling algorithm is carried out, Resources allocation according to the Φ as a result of user to the rights of using of resource in the base station.Adopt resource scheduling algorithm commonly used, the max carrier to interference algorithm is arranged, proportional fair algorithm or the like.Referring to document: Ofuji, Y.Morimoto, A.Abeta, S.Sawahashi, M. " Comparison of packetscheduling algorithms focusing on user throughput in high speed downlinkpacket access ", The 13th IEEE International Symposium on Personal, Indoorand Mobile Radio Communications, VOL.3, Sept.2002page (s): 1462-1466 (" in high-speed downstream bag transfer of data, improving the comparison of the dispatching algorithm of user data transmission speed ", the 13rd IEEE be about personal communication, the international symposium of indoor communications and mobile radio telecommunications).

The max carrier to interference algorithm is that resource S (i) is distributed to the best user u of S (i) upper signal channel condition:

$A\left(S\left(i\right)\right)=\underset{u}{\arg \max }\{H(u,S\left(i\right))/(\mathrm{Interf}\left(S\left(i\right)\right)+\mathrm{Noise}\left(S\left(i\right)\right))\}$

$=\underset{u}{\arg \max }\left\{H(u,S\left(i\right))\right\}$ (8)

In the formula, A (S (i)) represents resource S (i) is distributed to user's partition function, the channel power gain of H (u, S (i)) expression user u on S (i), Interf (S (i)) expression S (i) goes up the power that disturbs, and Noise (S (i)) expression S (i) goes up the power of noise.

Proportional fair algorithm is to give user u resource allocation, makes S (i) will bring the newly-increased transmitted data amount of user u and the ratio maximum that obtains transmitted data rates of user u:

$A\left(S\left(i\right)\right)=\underset{u}{\arg \max }\{d(u,S\left(i\right))/r\left(u\right)\}$ (9)

In the formula, d (u, S (i)) expression S (i) will bring the newly-increased transmitted data amount of user u, the acquisition transmitted data rates of r (u) expression user u.

The base station (is positioned at sub-district or sector X, is designated I _X) when Resources allocation, at first will be except that the resource S S (J (I the user's private resource of border _X)) distribute to the user who this resource is had rights of using, then, the base station is with boundary user private resource S (J (I _X)) distribute to the user who this resource is had rights of using.But, in this sub-district or sector, do not have authority and use S (J (I _X)) the user, or S (J (I _X)) be not used up, or owing to have authority to use S (J (I _X)) the user at S (J (I _X)) on channel condition poor excessively, and when abandoning using this resource, the base station will be the boundary user private resource S (J (I that is not used _X)) _{Do not use}Distribute to resource requirement, and this resource is had the user of candidate rights of using, to improve the spectrum reuse coefficient of cellular system.

(6) base station is carried out adaptive according to resource allocation result to user's up link

The base station is after finishing resource allocation, carry out adaptive to user's up link again, comprise and carry out power control algorithm and Adaptive Modulation and Coding algorithm, generate the parameter of different user upstream data, as: the power of use, modulation system and encoder bit rate etc., and inform the user, the user begins to send upstream data after receiving above-mentioned information.

Some power control algorithms commonly used have the maximum power allocation algorithm, the target signal to noise ratio algorithm, referring to document: 3GPP, R1-062861, " Uplink Power Control for E-UTRA ", Ericsson (3GPP document, numbering: R1-062861, " uplink power control in the E-UTRA system ", Ericsson company).

The maximum power allocation algorithm is to make all user u all send signal with the maximum power that the user can support:

P(u)＝P _max (10)

In the formula, P (u) is the upstream data power of user u, P _MaxIt is the maximum power that the user can support.

The target signal to noise ratio algorithm be earlier the compensation user u path loss of signaling (path loss is by the distance of user and base station, the shadow fading that near the user building situation causes, and the angle of user present position and antenna for base station determines), further improve the power of user u then, reach target signal to noise ratio, this power is with P _MaxBe the upper bound:

P(u)＝min(P _max，SNR _tagP _noise/L(u)) (11)

In the formula, L (u) is the path loss of the upward signal of user u, P _NoiseNoise power, SNR _TagIt is target signal to noise ratio.

Part path loss backoff algorithm also is the power control algorithm of using always, referring to document: 3GPP, R1-060401, " Interference Mitigation via Power Control and FDM ResourceAllocation and UE Alignment for E-UTRA Uplink and TP ", Motorola (3GPP document, numbering: R1-060401, " in the up link of E-UTRA system; suppress to disturb and scheme and standardized text suggestions such as frequency division multiplexing resource allocation and user's ordering " by power control, motorola inc).This algorithm is provided with different transmission power value according to the path loss consumption of different user, for the user of percent the most serious x of path loss, allows it with P _MaxSend data, for other users, according to its path loss values, partly compensate its path loss with α power function, this power is with P _MaxBe the upper bound:

P(u)＝P _max×min{1，max[Pr _min，(L _x-ile/L(u))α]} (12)

In the formula, Pr _MinBe minimum power and the maximum power P that the user sends data _MaxRatio, L _X-ileBe the path loss that is positioned at the x tercile in the system, promptly earlier all users' path loss arranged from small to large in the system that the path loss that is positioned at percent x place is exactly L _X-ile, α is a part path loss penalty coefficient.

The Adaptive Modulation and Coding algorithm is meant the channel situation according to the user, and resource allocation conditions and transmitted power situation are adjusted modulation and encoding scheme adaptively, reach link adaptation, thereby guarantee that Packet Error Ratio is lower than the required value of expectation.Referring to document: 3GPP, R1-061525, " System Analysis for UL SIMO SC-FDMA ", Qualcomm Europe (3GPP document, numbering: R1-061525, " single antenna sends in the up link, the analysis of the SC-FDMA system that many antennas receive ", Europe research and development centre of Qualcomm company).

The invention has the advantages that: the base station according to the user anti-interference with the situation of disturbing user in neighbor cell or the sector, distribute different resources use right limits, for the user who is easy to disturb user in neighbor cell or the sector, its resource that has authority to use of base station limits, and may reduce its transmitting power, disturb to reduce its cochannel the boundary user of neighbor cell or sector, thus the message transmission rate of the boundary user of raising sub-district or sector; For the user who is not easy to disturb user in neighbor cell or the sector, the base station makes its boundary user private resource to this sub-district or sector have the candidate rights of using, or may improve its transmitting power, obviously do not descend with the total speed of transfer of data that keeps system, so, advantages such as the present invention has that the spectrum reuse coefficient is higher, the total speed of the transfer of data of system is higher, it is simpler to realize when realizing reducing the target that cochannel disturbs between the user, Signalling exchange is less between user and base station.In up FDMA cellular system, has very high using value.

Description of drawings

Fig. 1 is the schematic diagram of layout and the antenna for base station setting and the user distribution of cellular system

Fig. 2 module diagram of the present invention

Fig. 3 is a flow chart of the present invention

Fig. 4 constructs the schematic diagram of S (j) for adopting the mode of choosing resource units continuously

Fig. 5 constructs the schematic diagram of S (j) for adopting the mode of uniformly-spaced choosing resource units

Fig. 6 constructs S (J (I for adopting the mode of choosing resource units continuously _X)) schematic diagram

Fig. 7 constructs S (J (I for adopting the mode of uniformly-spaced choosing resource units _X)) schematic diagram

Fig. 8 is the sector mark planning schematic diagram of 6 sector systems

Fig. 9 adopts the mode of choosing resource units continuously to construct the schematic diagram of S (j) in 6 sector systems

Figure 10 adopts the mode of uniformly-spaced choosing resource units to construct the schematic diagram of S (j) in 6 sector systems

Figure 11 adopts the mode of choosing resource units continuously to construct S (J (I in 6 sector systems _X)) schematic diagram

Figure 12 adopts the mode of uniformly-spaced choosing resource units to construct S (J (I in 6 sector systems _X)) schematic diagram

1. Figure 13 is designated I for the user is positioned at the sub-district ₁The sector in the diverse location distribution map.

Embodiment

Provide a concrete up FDMA cellular system parameters configuration below, set forth performing step of the present invention.Need to prove that the parameter in the following example does not influence generality of the present invention.

The document of 3GPP tissue: TR 25.814 V1.5.0, " Physical Layer Aspects forEvolved UTRA " (physical layer specification that the universal mobile telecommunications system of evolution and continental rise radio insert) and R1-063013, the simulation parameter configuration of one group of up FDMA cellular system that " Approved minutes of 3GPP TSG RAN WG1#46 in Tallinn " (ins and outs that RAN WG1 group of standard formulation working group of 3GPP international organization passes through in the 46th meeting that Tallinn holds) provide, as follows:

The parameter of up FDMA cellular system		Be provided with
			Cellular system model and layout		Regular hexagon honeycomb lattice, 7 cell pattern are adopted in emulation, and 3 sectors are arranged in each sub-district
User distribution		Evenly distribute at random
			Distance D between the cell base station		500m
Signal power is with the attenuation function of the distance of user and base station		L＝128.1+37.6log 10(R), the dB of unit, R are the distances of user and base station, unit K m
			The shadow fading standard deviation		8dB
Shadow fading correlation distance		50m
			The shadow fading coefficient correlation	Between the sub-district	0.5
Between the sector	1.0
		Penetration loss		20dB
Antenna for base station is provided with					The angle of antenna is 120 degree between the sector, and main lobe 3dB decay angle is 70 degree
		Bs antenna gain adds cable loss		14dBi
The base station noise coefficient					5dB
		The thermal noise power spectrum density		-174dBm/Hz
Minimum range between user and base station					＞＝35m
		User moving speed V		3km/h

User's maximum transmission power P max	24dBm
		User's number of transmit antennas	1
Base station reception antenna number	2
		Central authorities' carrier frequency	2GHz
System bandwidth	10MHz
		Subcarrier spacing f o	15KHz
Use total number of sub-carriers	600
		Each unit resource S (i) comprises sub-carrier number	12
The units N of resource in the system bandwidth	48 (48 * 12=576, remaining 600-576=24 sub-carrier number is used for some up signaling consumptions etc.)
		Transmission data slot length T TI	1ms

Fig. 1 is the schematic diagram of layout and the antenna for base station setting and the user distribution of this cellular system.

Simulated channel is 6-ray GSM Typical Urban Channel (global mobile communication typical urban zone 6 footpath channels is called for short 6-ray TU), and its parameter is as follows:

	Postpone (us)	Relative power (dB)
			Path 1	0	-3
Path 2	0.2	0
			Path 3	0.5	-2
Path 4	1.6	-6
			Path 5	2.3	-8
Path 6	5.0	-10

The present invention's other selection of parameter in emulation are as follows:

Other simulation parameters	Be provided with
		Number of users in each sector	40

Resource regulating method	Proportional fair algorithm is seen formula (9)
			The resource units number that each user can take at most in each TTI	6
The packet re-transmission mode of makeing mistakes	Appending soft value merges
			The packet maximum retransmission of makeing mistakes	5
The packet back off time of makeing mistakes	6TTIs
			Poewr control method	Part path loss backoff algorithm is seen formula (12)
Parameter x in the part path loss backoff algorithm	5
			Parameter alpha in the part path loss backoff algorithm	0.8
Parameter Pr in the part path loss backoff algorithm min	0.00001
			The scheduling frequency	Each TTI carries out once
Scheduler latency	1TTI
			The user data queuing model	Etc. data to be sent is infinite many
The receiving terminal equalizer	The least mean-square error equalizer
			The expected data packet error rate	0.1
The Adaptive Modulation and Coding candidate scheme	4 constellation point phase shift keyings modulation (QPSK)	Encoder bit rate=and 1/3,1/2,2/3,4/5}
			16 constellation point quadrature amplitude modulation (16QAM)	Encoder bit rate=and 1/2,2/3,3/4,4/5}
	The packet error rate curve of Adaptive Modulation and Coding candidate scheme	Adopt document: 3GPP, R1-061525, " System Analysis for UL SIMO SC-FDMA ", Qualcomm Europe (3GPP document, numbering: R1-061525, " single antenna sends in the up link; the analysis of the SC-FDMA system that many antennas receive ", Europe research and development centre of Qualcomm company) curve in
Apply the present invention to sub-district or sector				The sector
	Jamproof path loss threshold value Λ	The user is arranged from small to large to the path loss values of this sub-district or sector, get the value of 9% hundredths
Disturb the path loss threshold value Θ of user in neighbor cell or the sector				Choose user's maximum two values in the path loss values of a plurality of neighbor cells or sector, arrange the value of getting 2.5% hundredths from big to small
	Judge the anti-interference of user and the mode of disturbing user's situation in neighbor cell or the sector	The user judges the anti-interference of self and the situation of disturbing user in neighbor cell or the sector, report periodically to the base station that then be τ=1s reporting period

Apply the present invention to the sector, because described system is 3 sector systems, so sector mark has only 3, is respectively I ₁=1, I ₂=2, I ₃=3.

Fig. 2 is a module diagram of the present invention, wherein, and U: user; B: base station; S-B: serving BS; C: the service range of serving BS; Ω: downstream signal; M: the unit of monitoring downstream signal (Ω) among the user; Γ: the user detects the result of downstream signal (Ω); G: judge the anti-interference of user and the unit that disturbs user's situation in neighbor cell or the sector; Ψ: user's the anti-interference and result who disturbs user's situation in neighbor cell or the sector; RC: access authorization for resource allocation units; RA: resource allocation unit; LA: link adaptation unit

User U comprises the monitoring unit M of the downstream signal Ω that monitors base station B, and judge the anti-interference of user U and the unit G that disturbs user's situation in neighbor cell or the sector optional comprising; Base station B comprises access authorization for resource allocation units RC, resource allocation unit RA, and link adaptation unit LA, judge the anti-interference of user U and the unit G that disturbs user's situation in neighbor cell or the sector optional comprising.Behind the downstream signal Ω of user U monitoring and base stations detected B, with testing result Γ, or the anti-interference and Ψ as a result that disturbs user's situation in neighbor cell or the sector of user U reports to serving BS S-B, serving BS S-B is according to snoop results Γ, or direct reporting according to user U, obtain the anti-interference of user U and the Ψ as a result that disturbs user's situation in neighbor cell or the sector, use the authority of resource to distribute by access authorization for resource allocation units RC to user U then, obtain allocation result Φ, give user U resource allocation by resource allocation unit RA again, carry out adaptive by link adaptation unit LA to the up link of user U at last.

Fig. 3 is a flow chart of the present invention, in conjunction with Fig. 3 performing step of the present invention is described below:

(1) each sub-district or sector are arranged in the many sub-districts of Fig. 3 or the Coordination module of sector borders user private resource for wherein boundary user marks off this step of boundary user private resource.

Since N=48, so S={S (i) | 1≤i≤C (S), S (i)＜S (i+1), 1≤S (i)≤48}, C (S)=48.Then, S is divided into disjoint B=3 set as sector borders user private resource S (j) (1≤j≤3).Common division methods is to adopt the mode of choosing resource units continuously to construct S (j), and the element number among the S (j) is equated:

S(1)＝{1，2，3，4，5，6，7，8，9，10，11，12，13，14，15，16}C(S(1))＝16 (13)

S(2)＝{17，18，19，20，21，22，23，24，25，26，27，28，29，30，31，32}C(S(2))＝16(14)

S (3)=and 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48}C (S (3))=16 (15) is according to formula (13), formula (14), and the S (j) that formula (15) constructs satisfies the requirement of formula (3).The schematic diagram of the structure of above-mentioned S (j) as shown in Figure 4.

In order to improve the frequency diversity effect, adopt the mode of uniformly-spaced choosing resource units to construct S (j), and the element number among the S (j) is equated.Referring to document: 3GPP, R1-050629, " Inter-cellinterference mitigation ", Huawei.(3GPP document, numbering: R1-050629, " inter-cell interference restraint method ", Huawei company)

S(1)＝{1，4，7，10，13，16，19，22，25，28，31，34，37，40，43，46}C(S(1))＝16(16)

S(2)＝{2，5，8，11，14，17，20，23，26，29，32，35，38，41，44，47}C(S(2))＝16(17)

S (3)=and 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48}C (S (3))=16 (18) is according to formula (16), formula (17), and the S (j) that formula (18) constructs satisfies the requirement of formula (3).The schematic diagram of the structure of above-mentioned S (j) as shown in Figure 5.

In order to improve the time diversity effect, make each sector take turns in time with changeing and choose boundary user private resource S (j), that is:

J(I _X)＝mod((I _X+TTI_idx)，3)+1 I _X∈{1，2，3} (19)

In the formula, TTI_idx is the call number of TTI, represents time variable.Obviously, the J (I that constructs according to formula (19) _X) and S (J (I _X)) satisfy the requirement of formula (4).Being achieved as follows shown in the table of formula (19):

TTI_idx	J(I 1)＝J(1)	J(I 2)＝J(2)	J(I 3)＝J(3)
				1	3	1	2
2	1	2	3
				3	2	3	1
4	3	1	2
				……	……	……	……

Fig. 6 is adopting the mode of choosing resource units continuously to construct among the S (j) according to formula (19) structure S (J (I _X)) schematic diagram, Fig. 7 is adopting the mode uniformly-spaced choose resource units to construct among the S (j) according to formula (19) structure S (J (I _X)) schematic diagram.

If adopt 6 sector systems, S can be divided into disjoint B=4 set as sector borders user private resource S (j) (1≤j≤4).Sector mark plans that as shown in Figure 8 the programme of Fig. 8 can guarantee that adjacent sectors adopts different sector marks.Similarly, in 6 sector systems, adopt schematic diagram that the mode choose resource units continuously constructs S (j) as shown in Figure 9, adopt the mode of uniformly-spaced choosing resource units construct S (j) structure schematic diagram as shown in figure 10.Adopt the mode of choosing resource units continuously to construct among the S (j) according to formula (19) structure S (J (I _X)) schematic diagram as shown in figure 11, adopt the mode uniformly-spaced choose resource units to construct among the S (j) according to formula (19) structure S (J (I _X)) schematic diagram as shown in figure 12.

(2) user monitors and detects the downstream signal that contains identification information of this sub-district or sector and neighbor cell or sector

This step is arranged in user's monitoring of Fig. 3 and detects the module of downstream signal.

Obtaining Figure 13 in certain emulation, is that user u is positioned at the sub-district and 1. is designated I ₁The sector in the diverse location distribution map.At this moment, the user monitors and detects two adjacent sectors and (is designated I ₂The sector and be designated I ₃The sector) downstream signal Ω, this downstream signal Ω need contain the identification information I of sector ₂And I ₃If detecting, user u is designated I ₁The mean receiving power value of downstream signal Ω of sector be β ₁, be designated I ₂The sector and be designated I ₃The mean receiving power value of downstream signal Ω of sector be respectively β ₂, β ₃So, with β ₁, β ₂, β ₃Divided by the transmission power level of downstream signal Ω, obtain the user to sector I ₁, I ₂And I ₃Path loss values PL ₁, PL ₂, PL ₃, and then the anti-interference of user and the situation of disturbing user in neighbor cell or the sector judged.

(3) judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector

This step is arranged in Fig. 3, judges that the user is anti-interference and disturbs the module of user's situation in neighbor cell or the sector.

According to formula (5), when the user is arranged in the slot # 1 of Figure 13, PL ₁＞Λ, PL ₂＞Θ, PL ₃＞Θ, this user's antijamming capability is strong, and is easy to the user in interference sector 2 and the sector 3; When the user is arranged in the slot # 2 of Figure 13, PL ₁＞Λ, PL ₂＞Θ, PL ₃＜Θ, this user's antijamming capability is strong, and is easy to the user in the interference sector 2; When the user is arranged in the slot # 3 of Figure 13, PL ₁＜Λ, PL ₂＜Θ, PL ₃＞Θ a little less than this user's antijamming capability, and is easy to user in the interference sector 3; When the user is arranged in the slot # 4 of Figure 13, PL ₁＞Λ, PL ₂＜Θ, PL ₃＜Θ, this user's antijamming capability is strong, and is not easy to disturb user in neighbor cell or the sector; When the user is arranged in the slot # 5 of Figure 13, PL ₁＜Λ, PL ₂＜Θ, PL ₃＜Θ a little less than this user's antijamming capability, and is not easy to disturb user in neighbor cell or the sector; When the user is arranged in the slot # 6 of Figure 13, PL ₁＞Λ, PL ₂＜Θ, PL ₃＜Θ, this user's antijamming capability is strong, and is not easy to disturb user in neighbor cell or the sector.The above results is the anti-interference of user and the judged result Ψ that disturbs user's situation in neighbor cell or the sector.

In the present embodiment, adopt the user that the anti-interference of self and the situation of disturbing user in neighbor cell or the sector are judged, obtain judged result Ψ, then to the mode of base station periodic report, be τ=1s reporting period, and said process is the left branch in user's the anti-interference and judge module that disturbs user's situation in neighbor cell or the sector of Fig. 3.In 3 sectorized cell systems of present embodiment, adopt 3 bit feedback report manners.If the flag bit that antijamming capability is strong is 1, the weak flag bit of antijamming capability is 0.When whether identifying user is easy to disturb in neighbor cell or the sector user, with the sign I of 3 sectors ₁, I ₂, I ₃Adopt 2 bits to be encoded to 01,10,11 respectively.

According to formula (6), when the user was arranged in the slot # 1 of Figure 13, this user's antijamming capability was strong, and was easy to the user in interference sector 2 and the sector 3, its feedback 101; When the user was arranged in the slot # 2 of Figure 13, this user's antijamming capability was strong, and was easy to the user in the interference sector 2, its feedback 110; When the user is arranged in the slot # 3 of Figure 13, a little less than this user's antijamming capability, and be easy to user in the interference sector 3, its feedback 011; When the user was arranged in the slot # 4 of Figure 13, this user's antijamming capability was strong, and was not easy to disturb user in neighbor cell or the sector, its feedback 100; When the user is arranged in the slot # 5 of Figure 13, a little less than this user's antijamming capability, and be not easy to disturb user in neighbor cell or the sector, its feedback 000; When the user was arranged in the slot # 6 of Figure 13, this user's antijamming capability was strong, and was not easy to disturb user in neighbor cell or the sector, its feedback 100.

Above-mentioned feedback is listed as follows:

Customer location	Ψ		Feedback bits
				Antijamming capability is strong/a little less than	The interference sector sign
	#1	(flag bit is 1) by force				I 2，I 3	101
#2			(flag bit is 1) by force	I 2	110
	#3	Weak (flag bit is 0)				I 3	011
#4			(flag bit is 1) by force		100
	#5	Weak (flag bit is 0)					000
#6			(flag bit is 1) by force		100

(4) rights of using of base station assigns resource

This step is arranged in the access authorization for resource distribution module of Fig. 3.

The base station is according to the anti-interference of user and the judgement information Ψ that disturbs user's situation in neighbor cell or the sector, the rights of using of Resources allocation.1. be designated I in the sub-district in ₁The sector in, the base station is for the user who is easy to disturb user in neighbor cell or the sector, its resource that has authority to use of base station limits, and may reduce its transmitting power, disturb to reduce its cochannel the boundary user of neighbor cell or sector, thus the message transmission rate of the boundary user of raising sub-district or sector; For the user who is not easy to disturb user in neighbor cell or the sector, the base station makes its boundary user private resource to this sub-district or sector have the candidate rights of using, or may improve its transmitting power, obviously do not descend with the total speed of transfer of data that keeps system.

In Figure 13, when the user was positioned at slot # 1, this user's antijamming capability was strong, and was easy to the user in interference sector 2 and the sector 3, according to formula (7), and R (u)=, therefore, resource R (u)=S (J (I that this user u has authority to use ₁)).In certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource R (u) that this user has authority to use is:

R(u)＝{1，4，7，10，13，16，19，22，25，28，31，34，37，40，43，46}(20)

When the user was positioned at slot # 2, this user's antijamming capability was strong, and was easy to the user in the interference sector 2, according to formula (7), R (u)=S (S (J (I ₁)) ∪ S (J (I ₂)))=S (J (I ₃)).In certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource R (u) that this user has authority to use is:

R(u)＝{3，6，9，12，15，18，21，24，27，30，33，36，39，42，45，48}(21)

When the user is arranged in the slot # 3 of Figure 13, a little less than this user's antijamming capability, and be easy to user in the interference sector 3, according to formula (7), R (u)=S (J (I ₁)).In certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource R (u) that this user has authority to use is:

R(u)＝{1，4，7，10，13，16，19，22，25，28，31，34，37，40，43，46}(22)

When the user was arranged in the slot # 4 of Figure 13, this user's antijamming capability was strong, and was not easy to disturb user in neighbor cell or the sector, according to formula (7), R (u)=S (S (J (I ₁))), and to S (J (I ₁)) have candidate rights of using.In certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource R (u) that this user has authority to use is:

$R\left(u\right)=\left\{\begin{array}{c}\mathrm{2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47}\\ \mathrm{3,6,9,12,15,18,21,24,27,30,33,36,39},\mathrm{42,45,48}\end{array}\right\}$ (23)

The resource that this user has candidate rights of using for 1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46}.

When the user is arranged in the slot # 5 of Figure 13, a little less than this user's antijamming capability, and be not easy to disturb user in neighbor cell or the sector, according to formula (7), S (J (I ₁)), in certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource R (u) that this user has authority to use is:

R(u)＝{1，4，7，10，13，16，19，22，25，28，31，34，37，40，43，46}(24)

When the user was arranged in the slot # 6 of Figure 13, this user's antijamming capability was strong, and was not easy to disturb user in neighbor cell or the sector, according to formula (7), R (u)=S (S (J (I ₁))), and to S (J (I ₁) have candidate rights of using.In certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource R (u) that this user has authority to use is:

$R\left(u\right)=\left\{\begin{array}{c}\mathrm{2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47}\\ \mathrm{3,6,9,12,15,18,21,24,27,30,33,36,39},\mathrm{42,45,48}\end{array}\right\}$ (25)

The resource that this user has candidate rights of using for 1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46}.

In sum, the user is listed as follows the Φ as a result of resources use right limit:

(5) base station is according to the rights of using of user to resource, Resources allocation

This step is arranged in the resource distribution module of Fig. 3.

Resource scheduling algorithm is carried out according to the Φ as a result of user to the rights of using of resource in the base station, Resources allocation, and in the present embodiment, the proportional fair algorithm of employing formula (9) carries out scheduling of resource.

Among Figure 13, the base station (is positioned at the sub-district and 1. is designated I ₁The sector) when Resources allocation, distribute earlier the resource S S (J (I except that the user's private resource of border ₁)), back allocation boundary user's private resource S (J (I ₁)).In certain is once tested, when TTI_idx=2, J (I ₁)=1, J (I ₂)=2, J (I ₃)=3, by formula (16), formula (17), formula (18) can get, and the resource sequence number that the base station is distributed earlier is { 2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47} and { 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48}, the resource sequence number that the back is distributed is { 1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46}.Specifically, the base station is sequence number { 2,5,8,11,14,17,20,23 earlier, 26,29,32,35,38,41,44, the resource allocation of 47} is given and is positioned at #4, the user of #6, be sequence number { 3,6,9,12,15,18,21,24,27 again, 30,33,36,39,42,45, the resource allocation of 48} is positioned at #2, #4, the user of #6, be sequence number { 1,4,7,10,13,16,19,22,25 at last, 28,31,34,37,40,43, the resource allocation of 46} is positioned at #1, #3, the user of #5.Above-mentioned resource allocation order and distribution list object is as follows:

Assignment order

Resource sequence number to be allocated

The distributing user object

But when the boundary user private resource has residue and exist the user with candidate rights of using that resource is still had demand, the base station will be sequence number { 1,4,7,10,13,16,19,22,25,28,31,34,37,40,43, the user that the candidate rights of using are arranged is given in the resource allocation that is not used among the resource of 46}, promptly be positioned at #4, the user of #6 uses, to improve the spectrum reuse coefficient of cellular system.

In emulation, do not adopt the scheme that promotes user emission power or reduce user emission power, further improve performance of the present invention if desired, for a little less than the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, the base station makes it promote transmitting power to obtain higher message transmission rate, in Figure 13, the base station makes the user who is positioned at slot # 5 promote transmitting power to obtain higher message transmission rate; Strong and be easy to disturb the user of user in neighbor cell or the sector for antijamming capability, the base station makes it reduce transmitting power to reduce the interference to user in neighbor cell or the sector, in Figure 13, the base station makes the user who is positioned at slot # 1 and #2 reduce transmitting power to reduce the interference to neighbor cell or sector user.

(6) base station is carried out adaptive according to resource allocation result to user's up link

This step is arranged in the uplink adaptation module of Fig. 3.

The base station is after finishing resource allocation, carry out adaptive to user's up link again, comprise and carry out power control algorithm and Adaptive Modulation and Coding algorithm, generate the parameter of different user upstream data, as: the power of use, modulation system and encoder bit rate etc., and inform the user, the user begins to send upstream data after receiving above-mentioned information.

The power control algorithm that adopts in the present embodiment as the formula (12), its parameter is: x=5, α=0.8, Pr _Min=0.00001.The packet error rate curve and the document of the Adaptive Modulation and Coding candidate scheme that adopts in the present embodiment: 3GPP, R1-061525, " System Analysis for UL SIMO SC-FDMA ", Qualcomm Europe (3GPP document, numbering: R1-061525, " single antenna sends in the up link, the analysis of the SC-FDMA system that many antennas receive ", Europe research and development centre of Qualcomm company) curve in is identical.

In emulation, the system that investigated adopts the method for cochannel interference between the user of reducing of the present invention and the performance of noiseless inhibition scheme and method (2) (boundary user is defined as the user in the path loss of this sub-district or sector, 10% minimum pairing user) to compare.Simulation result is as shown in the table:

The scheme sequence number	Scenario Name	Boundary user data rate (Kbps) (5% the user that data rate is minimum)	Sector data speed (Mbps)
				1	Noiseless inhibition scheme	85	9.811
2	Method (2)	155	8.99
				3	The present invention	152	9.645

Simulation result shows that boundary user data rate of the present invention improves 78.8% than noiseless inhibition scheme, and sector data speed only descends 1.7%; Sector data speed ratio method of the present invention (2) improves 7.3%, and the boundary user data rate only descends 1.9%.Therefore, the present invention has the equal advantage of higher of the total speed of boundary user data rate and system.

The method that reduces cochannel interference between the user of the up FDMA cellular system that the present invention proposes is to each user, according to its anti-interference and the situation of disturbing user in neighbor cell or the sector, distribute different resources use right limits, for the user who is easy to disturb user in neighbor cell or the sector, its resource that has authority to use of base station limits, and may reduce its transmitting power, disturb to reduce its cochannel the boundary user of neighbor cell or sector, thus the message transmission rate of the boundary user of raising sub-district or sector; For the user who is not easy to disturb user in neighbor cell or the sector, the base station makes its boundary user private resource to this sub-district or sector have the candidate rights of using, or may improve its transmitting power, obviously do not descend with the total speed of transfer of data that keeps system, so, advantages such as the present invention has that the spectrum reuse coefficient is higher, the total speed of the transfer of data of system is higher, it is simpler to realize when realizing reducing the target that cochannel disturbs between the user, Signalling exchange is less between user and base station.In up FDMA cellular system, has very high using value.

Above-mentioned embodiment of the present invention just is used to set forth the example of technology contents of the present invention.The present invention is not limited to above-mentioned embodiment, should not carry out the explanation of narrow sense to it.In the scope of spirit of the present invention and claim, can carry out various changes and implement it.

Claims (10)

1, a kind of method that reduces cochannel interference between the user of up FDMA cellular system is characterized in that, comprises the steps:

Step 1: each sub-district or sector mark off the boundary user private resource for boundary user wherein, and the boundary user private resource between assurance neighbor cell or sector does not have overlapping, and described boundary user private resource can be multiplexing by the non-boundary user in neighbor cell or the sector;

Step 2: the user monitors and detects the downstream signal that contains identification information of this sub-district or sector and neighbor cell or sector, obtains the detection information of downstream signal;

Step 3:, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector according to the detection information of described downstream signal;

Step 4: the base station is according to the anti-interference of user and the situation of disturbing user in neighbor cell or the sector, the rights of using of Resources allocation;

Step 5: scheduling of resource is carried out, Resources allocation according to the rights of using of user to resource in the base station;

Step 6: the base station is carried out adaptive according to resource allocation result to user's up link.

2, the method that reduces cochannel interference between the user of up FDMA cellular system according to claim 1, it is characterized in that, in the described step 2, described detection information comprises: the identification information of sub-district or sector and user arrive the path loss values of this sub-district or sector.

3, the method that reduces cochannel interference between the user of up FDMA cellular system according to claim 1, it is characterized in that, in the described step 3, by the user according to described detection information, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector, again judged result is reported to the base station.

4, the method that reduces cochannel interference between the user of up FDMA cellular system according to claim 1, it is characterized in that, in the described step 3, the user reports described detection information to the base station, according to described detection information, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector by the base station.

5, according to the method that cochannel between the user disturbs that reduces of claim 1 or 3 or 4 described up FDMA cellular systems, it is characterized in that, in the described step 3, judge the anti-interference of user and the situation of disturbing user in neighbor cell or the sector, be meant: the user is made comparisons to the path loss values and the jamproof path loss threshold value of this sub-district or sector, if surpass threshold value, then this user is the strong user of antijamming capability, otherwise this user is the weak user of antijamming capability; The user is made comparisons with the path loss threshold value of disturbing user in neighbor cell or the sector to the path loss values of a plurality of neighbor cells or sector, if surpass threshold value, then this user is easy to disturb user in neighbor cell or the sector, otherwise this user is not easy to disturb user in neighbor cell or the sector.

6, the method that reduces cochannel interference between the user of up FDMA cellular system according to claim 5, it is characterized in that, for a little less than the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, base station to make it promote transmitting power to obtain higher message transmission rate.

7, according to the method that cochannel between the user disturbs that reduces of the up FDMA cellular system described in the claim 5, it is characterized in that, strong and be easy to disturb the user of user in neighbor cell or the sector for antijamming capability, the base station makes it reduce transmitting power to reduce the interference to user in neighbor cell or the sector.

According to the method that cochannel disturbs between the user that reduces of claim 3 or 4 described up FDMA cellular systems, it is characterized in that 8, in the described step 3, described user periodically reports to the base station; Perhaps, described user with anti-interference be that trigger condition is reported to the base station with disturbing in neighbor cell or the sector user's situation to change.

9, the method that reduces cochannel interference between the user of up FDMA cellular system according to claim 1, it is characterized in that, in the described step 4, described Resources allocation rights of using, be meant: according to the judged result of described step 3, strong and be easy to disturb the user of user in neighbor cell or the sector for antijamming capability, surplus resources beyond the boundary user private resource of the boundary user private resource of if possible disturbed sub-district or sector and this sub-district or sector is not an empty set, then the base station makes its lack of competence use the boundary user private resource of disturbed sub-district of possibility or sector and the boundary user private resource of this sub-district or sector, and have authority to use described surplus resources, if described surplus resources is an empty set, then the base station makes it have authority to use the boundary user private resource of this sub-district or sector, and lack of competence is used the resource except that the boundary user private resource of this sub-district or sector; Strong and be not easy to disturb the user of user in neighbor cell or the sector for antijamming capability, the base station makes it that the resource of authority use except that the boundary user private resource of this sub-district or sector be arranged, and the boundary user private resource of this sub-district or sector is had the candidate rights of using; For a little less than the antijamming capability and be easy to disturb a little less than the user of user in neighbor cell or the sector and the antijamming capability and be not easy to disturb the user of user in neighbor cell or the sector, the base station makes it have authority to use the boundary user private resource of this sub-district or sector, and lack of competence is used the resource except that the boundary user private resource of this sub-district or sector.

10, the method that reduces cochannel interference between the user of up FDMA cellular system according to claim 1, it is characterized in that, in the described step 5, described scheduling of resource, be meant: at first, the resource allocation beyond the boundary user private resource in this sub-district is given the user who this resource is had rights of using in the base station, then, the boundary user private resource is distributed to the user who this resource is had rights of using in the base station, at last, the base station will be distributed to resource requirement to untapped boundary user private resource, and this resource be had the user of candidate rights of using.

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